from:"Geoff"


D. Chester wrote:



From: Geoff/W5OMR <[EMAIL PROTECTED]>


Are you saying that Bellaire is no longer a separately incorporated 
town? When I lived in Houston, it was an incorporated town on its own, 
with its own city council, police force and its own city ordinances , 
but located completely within the Houston city limits, and surrounded 
by the City of Houston.


A little like Vatican City, which is legally a sovereign nation 
contained within Rome, Italy.


Kinda like Alamo Heights, here.  Completely surrounded by San Antonio

I do not know the answer 'specifically' to Bellaire, but I'm headed that 
way tomorrow for 5 days and will verify whether or not Bellaire is 
incorporated into Houston, or is still it's own entity like Stafford, 
Sugarland, Jersey Village, Spring, etc...


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[AMRadio] Every day of Freedom...


Glenn Zemanek wrote:

Every day of Freedom is a good day to Thank a Veteran.

Thanks, Glenn, for volunteering to protect our freedoms.


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Re: [AMRadio] 40M AM?


Phil LaMarche wrote:

AND some one who's license is 59 years and the brain of a 69 year old that
doesn't work like it did, should be grandfathered in.


Not to sound 'age discriminatory' or anything, but haven't we 'given 
away' enough, already?



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Re: [AMRadio] 40M AM?


Bob Macklin wrote:

I was surprised at how well it could copy CW when the CW was obviously
generated by another computer. It had a 99% correctness. This does not
happen when the CW is sent by hand. If the sender is really good it might
copy 75% but most of the time it is less than 50%.

My observation yesterday was that a significant amount of the contesting was
being done by computers.
  


I disagree that it 'had to be done by computer'.

Back in the mid 80's, as a 'Johnny Novice' (literally, still a novice) 
running 15wpm code on a Speed-X bug.  That was the best Bug I've ever 
operated.  Beats the Vibroplex, hands down.


I worked, on a regular basis, a WD5J... something or another, out in 
East Texas always on 40m, somewhere between 7.110 and 7.125 and he was 
using a new (at the time) Commodore 64 with a CW program on it.  He sent 
me a print out of the text I was sending with my bug.  Solid Copy for 5 
whole minutes, at an average for 15wpm. 


Computer programs are -much- more refined these days.

I've always received compliments on my 'fist'.  Have been accused more 
than twice of running some sort of code-generating device (computer, 
keyboard, whatever) while all the time I was using a bug.


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Re: [AMRadio] 40M AM?


Bob Macklin wrote:

I passed the General test in 1957. I passed the 2nd Class Phone in 1958.

On Saturday I took the Extra exam and passed it with knowledge gained in
over 40 years experience as an EE,

I did not know the Satellite questions and a couple antenna chart questions
so I did not answer them.

I just looked through the question pool twice last week and I figured I knew
the answers to at least 75% of the questions.
  


Congratulations, Bob!  Feels good to get that Extra class license under 
your belt, doesn't it


Proud on ya, man!

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Re: [AMRadio] 40M AM?


Bob Macklin wrote:

I did but there are other people that can't memorize 700 questions!


You wouldn't have survived the 50's, when you had to actually draw a 
schematic, answer questions with a short essay and rely on actual 
knowledge in comparison to a multiple guess question type of test, with 
a published question and answer pool.


There's simply no reason, or excuse why someone can't upgrade from 
General, these days.


The ARRRghL has petitioned the FCC to create the current 'dumbed-down' 
mind-set of the so-called 'ham' of today.


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Re: [AMRadio] 7160


Mike Duke, K5XU wrote:

Jeff,

The Tom that I'm thinking of was in Langtree, TX.
  


Sounds right.  The A A 5 what ever that I was thinking of was in 
Arkansas.  I met him at the Clairmore, OK hamfest back in about 2001 or 
2002.  I've got a picture of he and I someone on this network of 
computers but with nearly a terra byte of total storage space on the lan 
it's hard to locate things.  I need to get better organized :-)



He talked with W5MEU a lot, and with Vern, Wb0SUJ, on 1985.
  


That's a project I want to try, but can't get too excited about due to 
the lack of real estate.  I've always wanted to have a decent station 
setup here for one sixty.  I know that John talked regularly with Fred, 
W5JKD (Jack, King and a Deuce) up in Priddy, Texas.  Jerry, N5CBW is 
very near where Fred's QTH was, and reported a couple of days ago that 
there's now not even any reference of a building that was on that 
property.  JKD Fred, CBW Jerry and Ozona Bob, W5PYT were related 
(cousins, I believe) to each other.



Some of the last AM contacts made by Alton, W5FAP, were also on 7160.
  


W5 Fried Apple Pie.  Ol' Alton has only been gone now for about a year.  
He was 99 years and 6, or 8 months, when he passed. 

Along in about 1999 or 2000, Jeff/N5ECP, John/WA5BXO, Roy/W5MRY, 
Otis/K5SWK, Geoff/KA5THB, Yogie/KC5MIP, Alton/W5FAP, Bill/N5XPZ and a 
couple of others all gathered up in San Antonio and went to visit 
John/W5MEU after he was relegated to an 'assisted living' house on the 
North side of San Antonio.  At that time, I believe it was John/BXO that 
asked Alton how old he was, then.  Alton said "I'm Ninety Two years 
Young!" and with out grabbing the arms of the chair, stood straight up, 
and walked down the hallway as if he was in his mid 30's.  Alton kept 
himself in pretty good shape, physically.


I also remember, back in the 'glory days' of 7.160, when brother 
Noel/W5FAO was on the air in Waco, Mil/K5LKM was in Columbus and Ken 
Smith, W5FLV was on the air in Bellaire, TX.  Back then, Bellaire was 
South and East of Houston, between downtown Houston and Sugarland.  Now, 
Bellaire (and Sugarland, for that matter) are all incorporated into the 
conglomeration that has become the 'Greater Metro Houston area' which 
encompasses from Conroe to La Port, and from Brookshire to nearly 
Winnie, TX.  Guaranteed, it's a mess!


Good memories, Mike!  Thanks for the trip down memory lane.

--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] 40M AM?


Bob Macklin wrote:

You weren't in the exam room yesterday seeing people fail both the General
and Novice exams.
  


Gotta agree... anyone who can't pass a General or Extra test these days 
has got -serious- learning disabilities.



--
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is like driving your car at night, without headlights. (K4KYV)


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Re: [AMRadio] 7160


Mike Duke, K5XU wrote:

There is still a little AM activity there, usually on Saturday or Sunday
afternoon near 2:00 PM.
  


There's been some AM activity on 40m on 7.290 on Saturday and Sunday 
afternoons, as well.  At least, there used to be.


I remember the hay day of 7160, especially on Saturday mornings and Saturday nights. 
There was John, W5MEU with a fine sounding BC610 from San Antonio, 


That BC-610 will be back in my shack again, soon.


plus a guy named Tom, whose call I don't recall, but who had one of the best
signals from a Ranger I've ever heard. 


Wasn't Tom in Arkansas?  Had an AA5 call, as I recall.


There was also a guy named Paul from Illinois.
  


That'd be W9IEY, Paul near Chicago.


I'm omitting many other calls from that 7160 group, but there were a bunch
of guys there at least every weekend, and sometimes through the week as
well.
  


Oh, there were plenty of others that were on 40m, including Marv/W5TQO 
to name one, but a bunch more I can't remember, either.



--
Driving your AM Rig without a scope, 
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--
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-Geoff/W5OMR

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Re: [AMRadio] 40M AM?


Bob Macklin wrote:

The only thing wrong with 7160 is it requires an Advanced or Extra ticket.

Bob Macklin
K5MYJ
Seattle, Wa,
  


What's stopping you from upgrading?


Callsign 	*K5MYJ <http://www.qrz.com/callsign/K5MYJ>   *Class:* 
General   *Codes: <http://www.qrz.com/i/codes.html>* HVI*   USA

Name*Robert H Macklin*
Addr1   *309 5th Ave. S. Apt. 406*
Addr2   *Kent, WA 98032*
Country *USA*
Effective   *30 Aug 2003   *Expires:* 21 Mar 2013*
FRN *0008474678  *What's this? <http://www.qrz.com/i/fccsoup.html>
FCC 	*ULS Listing 
<http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=2497234>*

Lookups *209*
Update / Renew this License... <http://www.qrz.com/renewals>
 	Apply for new Vanity callsign... 
<http://www.qrz.com/click?id=613;tag=callsign:K5MYJ;page=db>

* *
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Coordinates 	*47.392732 -122.260066about 
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State   *Washington*
County  *King*
Grid*CN87uj*
Area Code   *206*
GMT Offset  *-8*
Time Zone   *Pacific*
Has DST?*Y*
Born*0010*



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Re: [AMRadio] Wanted: Receiver - New England


JT Croteau wrote:

   AM 75M and 40M coverage is my primary interest at this time, I will
NEVER be using the radio to tune in slopbucket nor CWer.  SWL and 160M
coverage would be nice as well but it will be a couple years before I
have space for a 160M antenna.

   Hi-Fidelity is near the top of my must haves but not if it's
results in a huge hit on receiver performance.  However, I definitely
don't want bottom of the barrel communications grade audio.  I've been
in some shacks where the audio fills the room and you can feel the
audio down to your bones.  I want to achieve this or as close as I can
get within my budget.
  


Define "Hi-Fidelity"?  Just because you can 'hear' the audio better, 
makes it hi-fi?


Hell, bubba.. if that's all you want, get some 18" woofers and a pair of 
tweeters, lash 'em up in a line-amp configuration, and take the 8-ohm 
output from your rice-box and drive them big speakers.  You'd be 
surprised what a -big- speaker will do, on a radio that you're used to 
listening to, that has a speaker about the size of a quarter


What about near-channel interference?  Tighten up the selectivity?  If 
you think that 6kc is 'narrow' what's gonna happen when some ssb'er 
snuggles up >2kc below ya?  (and you -know- they will!)


Any good ol' Hallicrafter or Hammarlund receiver would do you good.  The 
HQ-170 ~ HQ-180 is a good receiver... SP-600, SX-73, National's are 
good... see what they go for.  Occasionally one shows up here...




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Re: [AMRadio] 40M AM?


Jim Wilhite wrote:
Bob, there is a group of people on 7.195 here in the middle part of 
the country that have been operating there for years.  The group 
includes many guys who have jobs that drive daily and has mobiles on 
the air. There are also several high power operators there.


You are going to find a lot of frequencies are populated like that on 
40.  7.160 is a traditional frequency for AM and not many stations 
inhabit it, just an occasional transit station.  40 is a tough band to 
find an open frequency.


With the band open down to 7.125Mc, 7.140 sounds like a decent, and 
often open/clear frequency.


--
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-Geoff/W5OMR

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Re: [AMRadio] Replacement Tubes

2008-02-15 Thread Geoff/W5OMR


JT Croteau wrote:

On Fri, Feb 15, 2008 at 9:20 AM, jeremy-ca <[EMAIL PROTECTED]> wrote:
  

Your rig is spec'ed for 6L6's period.



Manual states otherwise, manual specs and schematic says 6L6GB's.
According to the specs, voltages are different between 6L6, 6L6GB, and
6L6GC with the GC's having the higher voltages.


It's always been my understanding that a 6L6Gx meant it was a 6L6 in a 
glass tube.


But, since I wasn't sure, I went looking, and did a little investigation.

You can check out the differences for yourself at
http://www.mif.pg.gda.pl/homepages/frank/sheets65.html


Then again, as someone else said, it seems much hoopla over the 
differences in 6L6's and 6V6's, and yet Zero comments on a Huff-n-Puff 
"very stable" VFO project.


I'm not caring enough to make this an issue. 

I did like my zero responses about my VFO project when we can go days comparing the 6V6 to the 6L6. 

Maybe I'm subscribing to the wrong reflector! 
;-()
  



--
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Re: [AMRadio] Replacement Tubes

2008-02-15 Thread Geoff/W5OMR


Bob Macklin wrote:

How many people have left the skin on their fingers on a HOT 6L6?


Is it the Ranger I (1614's) or Ranger II (7027's) that have B+ on a pin, 
that when 6L6's are substituted, the B+ appears on the outside metal 
plate of the tube?


Ask me how I know... BZT

But, that wasn't nothing compared to the 'thrill' I got one night, while 
talking to John/WA5BXO on 75m one night when I got across roughly 1kVDC.


Mostly went through my right thumb...  but I held the 'securely 
grounded' D-104 in the left hand...


NOT fun!

Nowadays, I don't let -me-, let alone anyone else, get behind my rig 
while it's on the air.


--
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Re: [AMRadio] Cap Substitution

2008-02-14 Thread Geoff/W5OMR


JT Croteau wrote:

I have a circuit that rectifiers power from a 24VAC tranny tap using a
1N91 to power a 24VDC relay.  It calls for a 50 uF filter cap to
ground.  Can I substitute a 47 uF?
  


Sure.  if you're unsure, use two 47uf caps in parallel... or a pair of 
33uf's...


I'm reminded when I asked an instructor about 'why bother to do exact 
calculations for resistance and/or capacitance if the manufacturers 
don't make, for example, a 54.5kOhm resistor, or a 51uf capacitor?"


He said "Ah, Geoff!  Welcome to the wonderful world of Electronics!  The 
Exacting Science of Approximation!"


Gotta say... he's got a point!

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-Geoff/W5OMR

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Re: [AMRadio] Re: 6V6 vs 6L6

2008-02-14 Thread Geoff/W5OMR


Bob Deuel wrote:


All this talk about 6L6's vs 6V6's while the answers are in any tube 
manual...


and yet, no one commented on the huff & puff home-brewed VFO that 
Jim/WD5JKO mentioned.


I, for one, wanna see the schematics.  I like the idea of the thing not 
drifting more than 10c over an hour warm-up period...


--
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Re: [AMRadio] 6V6 vs. 6L6


Bob Peters wrote:

Hi guys...Is the 6V6 and 6L6 interchangeable??? Small question  HI!!
  


no

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Re: [AMRadio] Trico colortop fuses.


Mark Foltarz wrote:

Just about any older harware store will carry those fuses.

Same ones as used in houses for decades.

Heck, did you try Home Depot ?

de KA4JVY
  


Not sure they have a Home Depot where Max./M0GHQ lives...

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Re: [AMRadio] RE: Using a Ranger as a driver


Gary Schafer wrote:

While it is true that for 100% modulation the modulation voltage must be
equal to the final plate voltage. 


No.  Not equal to, but *twice* as much.  2*Ep


But it is also misleading to say that it is strictly a function of modulation 
voltage.
  


What other voltage is present at the plate (other than the DC supply 
voltage) if not for the AC voltage achieved by the modulator?

High-level plate-modulation, we're talking about.



The modulation transformer secondary works into a certain load impedance
(resistance) supplied by the final plate circuit of the RF stage. While it
is true that the modulation voltage must match the final plate voltage (for
100% modulation), 


2*Ep.



--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Todays Toy - Elmac PS-2V


JT Croteau wrote:

On Feb 12, 2008 3:35 PM, Greg <[EMAIL PROTECTED]> wrote:
  

The original relay probably pooped out and was substituted with a six volt
DC relay.



Well, that would make sense but the relay installed is a 24V relay.  Heh.


Sometimes, it doesn't mater what the voltage is, as long as the current 
requirement is satisfied.


--
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is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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[AMRadio] A productive Morning

2008-02-12 Thread Geoff/W5OMR


Good morning, troops!

"Today"
Today, I was able to wake up, walk, talk and complain about things I can 
-not- change!

Today, I am TOO Blessed, to be Stressed!
:-)

So, while we're on the positive side of things, I think I've managed to 
incorporate new/old technology out in the ham-shack.


Hear me out.

The final is home-brewed.  I'm sure you already knew that, and it runs a 
pair of 250TH's in push-pull, class C.


Well, what you may not know is that now I have -two- RF finals, that 
incorporate the 250TH tubes.  The original was built by a dear friend of 
W5BU/Dan(sk) back in the mid 50's.  This one I'm using now, was built by 
Mike/W5IMF in the early/mid 60's.  Thanks to my good friend, Duie/K5KZQ, 
I was able to obtain this good ol' boat-anchor and put it back on the 
air after 40 years of collecting dust.  Works great, too ;-)


NORMALLY, I would drive it with the Viking II, like I do the Titanic 
final, but the grid input is different on the 'new' final.  In order to 
maintain around 125mA of grid drive (250TH's require 45mA per, for Class 
C.  That's 90mA for a pair.  Running another 15mA of grid drive on each 
ain't gonna hurt them big jugs ;-)) Using the Viking II, this wasn't an 
issue for the plug-in coil and swinging link arrangement on the original 
final.  On the 'new' one, I've got to slip in the 160m coil, re-dip the 
final, unload it as much as possible and then back off of the grid 
drive.  You know what happens to tubes in Class C when they don't have 
sufficient grid drive, and full plate voltage... run-a-way current 
shoots sky-high and there's nothing to stop it.  There's protective bias 
on the 6146 finals of the Viking II, and I'm -sure- that's the only 
thing that's kept those tubes from shooting up outta their sockets like 
little glass rockets! 

What I have done in the past, with this 'new' final, was to use my 
little Kenwood TS-450S, all band/all mode xcvr as the RF driver.  But, 
it takes around 35~40w to get the grid drive to the 125mA level.  Kinda 
hard to tame a Viking II down to that level, and it's kinda hard on a 
solid-state rig, with the long ol' buzzard transmissions I tend to make 
(so I'm told) ;-)


Soo...

A while back, Rick/K5IAR and I made a deal on a Globe Linear.  This 
thing uses 4 sweep tubes, something like 6DQ6's or some such.  So, I got 
it out, hooked it up, fed RF into the darn thing, and hung it on an 
antenna.  It'll produce around 200w output with 50w of drive from the 
solid-state exciter.  Not bad.  Then, I backed off on the carrier and 
power controls on the little solid-state exciter and got the exciter/amp 
lash-up down to a more 'reasonable' level for driving the final.  Then, 
I connected it to the final, made some minor tuning adjustments on the 
grid input and voila(!) the solid-state exciter is making around 4 or 5 
watts output, (no danger of hurting anything there) the Globe linear 
amplifier is making enough output at about 1/4th (or less) of it's 
maximum output, and that drives the 250TH grids right to 125mA, and it 
-stays- there.  Nothing is wavering.  Kewl!


All that's left to do now, is find a set of relay contacts that I can 
use to key the exciter, or use the exciter to key a relay that will, in 
turn, activate the 110vAC T/R relay.  I think the last thing I want to 
do, is try to make/break 110vAC out of the back of the solid state rig 
;-)   I think what I -really- need to try to find, is one of the dual 
SO-239 Dow-Key T/R Relays, and that way I could also use the Solid-state 
rig as the station receiver, as well.   The Globe Linear does -not- have 
T/R switching in it.


Currently, the original T/R relay is doing a good job of switching the 
antenna between the RCA AR-88 (Thanks to Jim/WD5JKO for the receiver) 
and the transmitting side of the relay.


With it's 'direct frequency entry' keypad, I'd like to be able to use 
the Kenwood as a receiver, also.  Maybe instead of, as opposed to 'in 
addition to'.

(no, the AR-88 is -not- for sale).

So, after the story, what I'm asking for is; does anyone have a dual 
SO-239 Dow-Key T/R relay they would be willing to part with?


As always, 'deal' mails should be sent off-list.  Discussion about the 
setup would be encouraged to be conducted -on-list-.


Thanks for your time, patience and consideration.

--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Ranger driving SB220

2008-02-11 Thread Geoff/W5OMR


Patrick Thompson wrote:

How did you go about getting the RF drive from the Ranger down to a level
usable by the SB220? 


[...]

I thought about a homemade pad but that's a lot of heat to throw away. Maybe
a 3db pad and turn the drive down a little?
  


AE5AW/Bill, in San Angelo, TX, inserted a roll of 50ohm coax between the 
Ranger I and the grid input of his GU-76 amp. 
He gets around 6 watts of carrier out of it, and the station sure sounds 
good from out in West Texas!



I could lower the screen voltage but it would be nice to have the rig full
power when barefoot.
  


You could wire in a big pot, to vary the screen voltage.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] Using Heath SB 610 Monitor Scope to monitor modulationonAM transmitter

2008-02-11 Thread Geoff/W5OMR


Jim Wilhite wrote:
To anyone considering an SB 610 or 614, keep in mind they must be 
constructed to match the IF frequency of the receiver to which they 
will be interfaced.


Uh...
I was under the impression that the 610 / 614 monitor scopes were for 
monitoring the 'transmitted' signal.




Some of them were built to work with the Heath receivers with the 3 
meg IF and those that were built for 455 Kc. had the coils that would 
do so.


If you find one for with the 3 Kc IF coils, 


kc?  you said 3meg(sic).  Which is it?

it won't work properly with a NC 300 or NC 183D for example.  Heath 
packaged the coils for both with the units and the builder chose which 
he wanted.  I doubt you will receive the coils that were not used 
during construction.   Check them out before you find you have 
something that won't work with your receiver.



So...
I was under the impression that the 610 / 614 monitor scopes were for 
monitoring the 'transmitted' signal.  Since I wasn't sure, I went looking.



http://web.comhem.se/~u87540545/Heathkit/Products/pageSB610.htm
Heathkit SB-610
The Heathkit SB-610 monitor scope is primarily designed for monitor the 
RF-signals, on-the-air signals, from the local transmitter. It can also 
be used to monitor received signals when connected to a receiver.
It monitors RF-envelop, RF-trapezoid and RTTY pattern. SB-610 has also a 
built-in two-tone sinewave AF-oscillator for SSB-transmitter adjustment.


The Monitor-Scope matches the SB-line.




--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] Hamcation Report

2008-02-11 Thread Geoff/W5OMR


EP Swynar wrote:

Hi Mark,

OK, I'll bite...just where, exactly, was this Ham Radio Xanadu, anyway...?!


Google says
go see www.hamcation.com

--
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-Geoff/W5OMR

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Re: [AMRadio] Re: AMRadio Digest, Vol 49, Issue 35

2008-02-09 Thread Geoff/W5OMR


Peter Markavage wrote:

830 service manual shows the difference between the 830S and the 830M(AM
version). Additional simple board with several transistors, relay, and
some discrete components. Need a 6 KHz AM filter (the one from a TS-930
works fine). After wiring modification, "Wide CW" on the mode switch
becomes the AM position. Not hard to implement if you feel ambitious.
  


John/WA5BXO modified an 830 (or 820) to generate genuine AM.
It doesn't receive AM, but the 4 or 5 watts out of it, drive an SB-200 
(pair of 572B's) to around 50 or 60w which then, in turn, drives the 
grids of his 250TH final.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Re: AMRadio Digest, Vol 49, Issue 35

2008-02-09 Thread Geoff/W5OMR


D. Chester wrote:
I have never understood why they went to that stupid numerical 
equivalent of the color code (example:  a tiny "101" stamped on the 
body instead of brown-black-brown stripes or dots).  Is this supposed 
to be some kind of ADA accommodation for the colour-blind?


Easy there, Don  ;-)

Otis/K5SWK is color blind, to some extent.  Back in around 1988~89, Otis 
was planning a trip to come visit Koby/K5MZH(sk) in San Antonio, TX and 
wanted to build a little hearing-aid to copy the mail on the 500 mile 
round trip road-trip.


He was just about done with building the thing (it was only a converter, 
using 12v tubes, coils and can's and such) and Otis was on his knees 
with a VOM and a couple of piles of resistors; ones he'd checked, and 
ones he hadn't.


Along about that time, here comes ol' John/WA5BXO sauntering through the 
radio/TV shop that he and Otis were partnered on, and sees Otis on his 
knees, and asks "what in the hell are you doing down there?"


Otis said "I'm looking for a (whatever_value) resistor to finish up my 
mobile receiver!" 
John got his diddle stick out, twirled through the piles a couple of 
times and brought out a number of whatever value was needed and said 
"here ya go!"


Otis glanced up at John with 'the look', and said 'Do you know I've been 
down here for durn near an HOUR looking for these things?  And you come 
along in 20seconds and find a half dozedn!"

;-)

I can see where the ADA might have had a hand in putting numbers on 
caps/resistors, etc...


BTW, Speaking of Otis..

On the 7th of February, Perry/W5KGZ, Wayne/W5DWP, John/WA5BXO, 
Geoff/W5OMR, Jeff/N5ECP and BJ/WB5PKD made the pilgrimage to Humble, TX 
and invaded a Golden Corral Restaurant to celebrate the 85th anniversary 
of Otis' birth.


If anyone is interested, contact me off-list and I'll send a link where 
pictures of the event can be viewed, after I get 'em  transferred over 
from  my laptop and camera.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Amateur Radio Exam Question

2008-02-07 Thread Geoff/W5OMR


Ellen Rugowski wrote:

  Other people I knew who'd taken their Advanced & Extra
Class back in the 80s & 90s felt the same way -  the Advanced was the hard
one.   
  


Our paths and time-lines are very similar, Ellen.  I said -exactly- the 
same thing back in '88 when I got my Advanced; that it was more 
difficult than the Extra.


Besides, who -cares- how much blanking a video signal is used to produce 
an all black screen?

;-)

(note to all:  see how the message was cleaned up, and repititious quoted text 
and message footers have been removed?  it's -not- that hard, people!)

--
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--
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-Geoff/W5OMR

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Re: [AMRadio] Re: Carrier with one sideband

2008-02-07 Thread Geoff/W5OMR


rbethman wrote:



The "modern" SS rigs do NOT generate AM in that manner.

The last radio that I saw that used a carrier with ONE sideband for AM 
was the Collins KWS-1.  That is precisely why I did NOT procure one 
when the opportunity arose.


Swan did the same thing.  There was a 'carrier null' adjustment on the 
front of the Swan 350C that I had (think the 270 and 500 had it, as 
well) but there was no real 'AM' mode, on the radio.  With the carrier 
'unbalanced', you could modulate the thing like AM and be heard on 
-some- diode detector type receivers.



--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] Re: WTB: HV Tranny

2008-02-07 Thread Geoff/W5OMR


JT Croteau wrote:

On Feb 7, 2008 1:14 AM,  <[EMAIL PROTECTED]> wrote:
  

Don't forget about the 5881's bias battery or source.



Yup, got it covered.  Thanks.  A few people have recommended three
9V's in series, I will likely do this.


Back in my 'Johnny Novice' days, I remember when I switched modulators 
for my 250TH's, from a pair of 811's to a pair of 810's.  Big mistake 
(*=read below)
I also went from 0 bias, up to a requirement of -45v or some such.  It's 
been a long time ago.  T had found a bunch of old, dead/weak 9v 
batteries and strung 'em together.  Eventually, I wound up with the 
required voltage but there were something like 7 or 8 batteries in 
series ;-)



That darn handbook... said a pair of 811's was only like some 175w in 
Class B.  But, wow, what's this? 810's have 700w?!?  I GOTS TO HAVE ME 
SOME OF THEM (or so I thought).  Contacted John Mohn/W5MEU(sk) and 
struck a deal.


Apparently the 810's I had were either weak, or there was a severe 
mis-match of impedance, using that ol' buzzard RCA 5500ohm 1:1 
open-frame modulation transformer.  But, in order to get the same level 
of audio I was getting with the 811's, I had to run (-4-) 810's in 
push-pull parallel.  Plate voltage was around 1500 on the 810s, common 
Final/modulator B+ supply.  I only ran 1500vdc on the 811's, but a pair 
of 811's has 'beau coup' audio. 

I did some experimenting, and eventually even pulled the parallel tube 
on the negative peak side (two 810s on the positive peak side of the 
modulator, one 810 on the negative peak side.  I -finally- started 
seeing decent peaks on the scope).


I think my next modulator is going to be Four  (4) 811s in push-pull 
parallel.  I might even go with six (6) just to insure there's plenty 
enough dissipation for natural asymmetrical audio peaks.


Having -enough modulator power- to faithfully reproduce your voice is 
what's required to modulate the final to 100%, with as little distortion 
as possible.


100% modulation, to me, is where the negative peaks hit the baseline of 
the carrier.  When you go more negative than that, then that's where 
over-modulation, distortion, splatter and a whole myriad of other bad 
things happen that are -not- in 'good engineering practice'.


The myth is:  for running 500w of carrier, you need 250w of audio power. 
While that works out mathematically for a sine-wave, that is simply not 
a true statement for a carrier modulated with the rich harmonics of the 
human voice.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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[AMRadio] formula values

2008-02-06 Thread Geoff/W5OMR


Van K7VS wrote:

WOW!  Lots of comments on this one!  73  P=E x I  or is it  P=I x E



Back in 1991, when I was going to tech vocational school, they were in 
the midst of changing "E" to "V".


Figuring power is no longer as simple as P=IE... rather P=IV

Vedalia?  (~shrug~)

E will always equal Electromotive Force, to me.

--
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is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] Survey Results are in!


[EMAIL PROTECTED] wrote:

All
Thank you for participating in my little ad-hoc survey of AMers.  I will copy 
the results below.  For those responers who responded openly to the list, I 
thank you and since everyone has already seen your comments, there is no need 
for me to copy them.  For those who responded to me directly and not to the 
list, then i will honor your trust and not publish your comments.  You are free 
to list your comments yourselves, of course.

We had 22 responders.  The favorite band was 80 meters, the favorite antenna 
was a dipole.  I was surprized that the favorite feed line was ladder, not 
coax.  Most people use a transmatch, and the vast majority use separate 
transmitters and receivers.  Most activity takes place in mornings or evenings, 
and on weekends.  Most of us spend 4 to 10 hours per week on the hobby, and 
another surprize was that two thirds of respondents prefer technical work to 
operating.


Total Responders  22
  


I had forgot about this survey, as I was out of town for the last two weeks.

Put me down for an 80m opearator, using a full-wave Delta loop, fed with 
450-ohm ladder line, using separate transmitter and receiver, RX is 
commercial and TX is (mostly) homebrew.  Final is hb, exciter is 
commercial, audio is modified commercial/homebrew.  As for how long?  
uhm... depends on the round table and how many a day I get into.  
typically a couple of hours, every morning (when I'm home). 14~20 hrs a 
week sometimes... sometimes as little as 4 hours a month.


As I've stated, I don't care how something -looks- as long as it -works- 
well!


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] OFF TOPIC POST MOSLEY


Phil LaMarche wrote:

On www.qth.com there's a listing for ART-13 parts that I tried to copy and
paste that the reflector refused.  Just search ART-13.

  


The reflector only accepts plain text postings.

Best to just cut-n-copy the link.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] My latest toy has arrived, an ART-13A

On the subject of ART-13's, Gary/WA5FWC, in Venus, TX, has three of 'em 
that he's refurbished to original condition.


He would likely be a good source of information.  I do not believe Gary 
is a member of this reflector.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] Golden Gate

JT Croteau wrote:

On Feb 5, 2008 11:06 AM, Jose HF Silva <[EMAIL PROTECTED]> wrote:

Is that circuit just the (screen) Modulator?

Don't believe so.  The talk I've seen about it indicates it's a full
transmitter originally for mobiles out in the SF Bay Area (hence the
name). It seemed to be quite popular in the area.  It used 1/2 of a
12AT7 for a crystal oscillator driving a 6146 and screen modulated by
the other half of the 12AT7.

I found a thread about the Golden Gate (or something similar) via 
Google...  the thing culminated with this posting:

On Dec 9 2007, 7:15 am, "W7CXA"  wrote:
> I am looking for information on a 3 tube 75 meter am transmitter 
that was around about 1958.  Two of the tubes were 6146, one for 
modulator and one

> for final.  I cant remember what the oscillator was.
> J. Andy Thompson
> W7CXA
> Yakima, WA

Back in the 50's there was a very popular TWO tube mobile transmitter 
used by several mobile operators on 3995...  Developed by Bob Carter,
W6NTU who lived up on the side of Mt. Hamilton near San Jose... It 
used a12AT7 driving a sweep tube... Several of the fellows in addition
to a variant of sweep tubes, used a 6146 and an occasional 2E26 in the 
final as well depending on available plate voltage...  Half of the
12AT7 was the Oscillator, the other half was modulator...  Carter 
Modulation transmitters were very popular due to their simplicity and
performance.  When loaded a bit on the heavy side, the audio sounded 
quite good... 

Go to:http://www.geocities.com/ResearchTriangle/Lab/4513/carter.html
For a bit of History and a schematic of the transmitter... 

Remember load that lil sucker fairly heavy with very little 
perceptible plate dip for best audio results...

Good Luck  de Grady K6IXA

--
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--
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-Geoff/W5OMR

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Re: [AMRadio] Alternatives to GatesGarbage(tm)


John Lawson wrote:



  Folks might also look into Sun's Star Office Suite - does each and 
everything that Micr$..t does, thats WP, Spreadsheet, Database, 
Powerpoint, etc etc - the whole thing is $80...  I use it heavily in 
all of my business ventures, and have yet to find an 
incompatibility...  80 bux for all of it.


  Then of course, use FireFox for a browser and Thunderbird for your 
email - you won't be subject to the whims an vagaries of the 
MicroSheep (can you tell I've little use for the boys and girls in 
Redmond??) and you'll be a whole lot safer, as well


For that matter, you could get and install your favorite version of 
Linux (free for downloading off the 'net, burning the 'live cd' .iso 
image to a disc and looking around at different distributions without 
installing to your drive, till you find what suits you - for free) that 
comes with Open Office, for free.


Just think... you could have a computing experience that doesn't require 
the $ Micro$haft wants ever living, breathing computer-user to pay, to 
use 'their' software.


And, there's a lot you can do with Ham radio, in general, with Linux...

Did I mention that Linux is virus resistant, as well?  ;-)

--
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is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Re My latest toy has arrived, an ART-13A

2008-02-04 Thread Geoff/W5OMR


jeremy-ca wrote:
Interesting. Im using OE and it displays if I put the cursor on the 
line and also if I move the tab at the top over a bit. Ive no 
experience with other email programs, learned something new.


Anyway it is an ART-13A



Y'all need to get off that M$ proprietary junk...

Thunderbird is a -much- better email client.

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-Geoff/W5OMR

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Re: [AMRadio] My latest toy has arrived, an ART-13A

2008-02-04 Thread Geoff/W5OMR


Bob Macklin wrote:

WHAT IS IT?
  


...read the subject...
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Re: [AMRadio] The Viking II is FINALLY starting to work

2008-02-03 Thread Geoff/W5OMR

Ellen Rugowski wrote:

Hi Everybody,

Hi, Ellen! :-)

The Viker loaded up, and finally produced power (about 125W on CW, key down). Plate current is not maxed, but still may be a little high (about 220 mA), on key down.

Completely the expected output power for the indicated plate current.
220mA is about where the book says to load it on AM... I think you can
even go a bit more on CW but you'll probably get closer to chirps and
clicks if you load it 'all the way'. Even on phone, it's better on the
6146's to drop the plate current down to just under 200mA (say 180 or
190mA). You're not drawing as much current though the secondary of the
modulation transformer and the difference in power output is 90w vs
110. Who's gonna know?

Also. a couple of times when I keyed down, I saw some smoke curling up out of either the area of the finals, or the loading capacitor. I'm not sure which is the culprit.

good luck on finding that culprit. I hope, for your sake, that it's
just dust.

Per Rodger's suggestions, I'll check things out some more today, now that I'm not so tired (I didn't finish working on it until almost 11:30 PM).

sometimes, it's hard to see the forest for all those trees in the way
;-) Take a break from your project once in a while and then come back
to it, to gain a new/different perspective.

--
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is like driving your car at night, without headlights. (K4KYV)

--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Wanted: Ranger front panel

2008-02-03 Thread Geoff/W5OMR


Mike Sawyer wrote:
I'm pretty sure that is who Howard would sub-contract out to. However, I 
talked with Dee about a year ago on 160. I thought he indicated to me he was 
getting out of business. But don't quote me on that;>)
  


Dee has a silk screening process that he does to the front panel of 
those old johnson rigs.  I've seen a couple that he's done, and no 
doubt, they come out looking better than they did when they were brand 
new in the 50's and 60's.  Somewhere, some hamfest, someone had a Ranger 
I,, that had a re-finished front panel, and the owner then had the case 
chrome plated.  Looked sharp... but it wasn't 'right' looking if I were 
going for aesthetics).



I think I want to build up a single 6080, or 6SA7... some dual-triode 
tube with substantial plate dissipation, and then modulate it with a 
pair of the same.



--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Wanted: Ranger front panel

2008-02-03 Thread Geoff/W5OMR


Peter Wittenberg SR wrote:

Gary, Howard Mills W3HM strips adn repaints these panels. Contact him at [EMAIL 
PROTECTED] or call at 304-876-6483.
  


Dee Almqiist (sp?) is yet another alternative, as Dee does the front 
panels on Johnson gear, as well.


Personally, I don't give a damn about how something looks, as long as it 
works well.


--
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is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] Building my first regenerative RX

2008-02-02 Thread Geoff/W5OMR


AirRadio wrote:


That looks really great, I have almost enough bits in my junkbox to 
construct this ( might even have a Selenium rectifier!  hihi)  I love 
the sound of breaking glass, now where's all those old dead octals 
gone? Seriously though you don't have to use old tube bases but you 
might have to recalculate the coil dimensions, I wonder if there is a 
simple transmitter to go with it? 73 Max M0GHQ


Jon/AD5HR built up a single 5763 plate modulated by a pair of 6AQ5's.

He drew it up, and says if anybody wants a copy, to drop him an Self 
Abused Stomped Antelope (SASE) to his address that is good at ww.qrz.com




--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Re: New IP address

2008-01-31 Thread Geoff/W5OMR


John Coleman wrote:

My IP here at work where the server is located, is a static IP commercial
account.  It was changed only because of the Comcast take over.
  


ooo, I forgot about that happening.

John (and anyone else interested) try www.speakeasy.net and check your 
speed, now.  I believe the Dallas server would be closest to you.


--
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is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff, W5OMR/5 New Orleans

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Re: [AMRadio] Re: New IP address

2008-01-31 Thread Geoff/W5OMR


rbethman wrote:

Don,

It really depends on your ISP.  I've had Comcast for about 9 years.  
I've had the same IP Address the whole time.


While it is NOT a "static" address, it is still always the same.

Of course once you hit my internal router - all bets are off!  Being a 
computer type by profession, I have my own network and methods in 
place to keep the "bad" guys and "things" out.


Bob - N0DGN

D. Chester wrote:


same thing at my place, Bob.  I think my ip has changed 4 times over the 
last 5 years. 

While the ISP (same, I think, as John's, just a different city) declares 
that "thou shalt not run servers", port re-direction works fine, and 
those that have been invited to look at some of the AM Related pictures, 
files, schematics, tube-data-sheets, etc... know about it.


It's also what allows me, through a pgp encrypted and password protected 
ip tunnel through the firewall on the linux server at home, to access my 
workstation while I'm on the road (as I am now).


Laissez les *bon ton roulette*!

--
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is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff, W5OMR/5 New Orleans

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Re: [AMRadio] Re: Mike, W5FZ

2008-01-24 Thread Geoff/W5OMR


D. Chester wrote:
Mike's call used to be K5FZJ (or was it WA5FZJ?),  


dunno... that was before I met him in 1985/6 when he was (then) K5FZ 
(Fuzzy Zipper)


and then  he got it changed to W5FZ.  I ran into him at Dayton one 
year, the first time I ever met him in person.


Haven't heard him on the air for years.  What happened to him?

And has he changed call signs again?


He has.  The last time I worked Mike, he was W5MP (Mike Palmer) and he 
was in Costa Rica (/TI5) and it was on 17m ssb. 

Last I heard, his whole (married) family was down there.. wife, kids... 
she wanted to go back to Houston - he wanted to stay.  He stayed, and 
she left.  Dunno anything more than that.


--
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--
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-Geoff/W5OMR/5 New Orleans

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Re: [AMRadio] Re: National Anthem

2008-01-24 Thread Geoff/W5OMR


Todd, KA1KAQ wrote:

On Jan 24, 2008 1:05 AM, Geoff/W5OMR <[EMAIL PROTECTED]> wrote:

  

I forget if it was the National Anthem or the Star Spangled Banner...




"And they give you cash, which is just as good as money" - Yogi Berra, 2006

errrm.. we need to get you out more, Geoff - or at least, on the air.
  


hard to get on the air, when I'm not home... (again)


--
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--
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-Geoff/W5OMR/5 New Orleans

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Re: [AMRadio] Re: Recent insulting threads

2008-01-23 Thread Geoff/W5OMR


D. Chester wrote:
Wasn't he the one with the Kelvinator Kilowatt, a transmitter built 
into an old refrigerator?


Not sure if he called it a 'Kelvinator', but Johnny/W5TMI in Bomerton, 
TX (back in the 50's/60's) build up his 40m rig in a refrigerator...


  If that (the anthem proposal) had passed, wouldn't it be cool to 
play the Jemi Hendrix version (IMO the best instrumental rendition of 
the national anthem ever played by anyone) at the end of every QSO?


Seems I recall that Mike (then)W5FZ, Lee/W0VT and Darrell/WA5VGO when 
they resurrected the prototype KW-1, they played a patriotic tune.  I 
forget if it was the National Anthem or the Star Spangled Banner... but 
on it's inaugural transmission, something patriotic was played.



--
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-Geoff/W5OMR

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Re: [AMRadio] Hamfest creeps

2008-01-18 Thread geoff

Jim Wilhite wrote:
> Just wait a few years Brett.  Some of that will come true. :>)

Brett's already in the basement ;-)  At least, that's where his
shack/workbench are...

>> His garage is filled with WW2 or older totaly rusted out radio gems,
>> as is the basement.

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Re: [AMRadio] Home-brewing construction considerations

2008-01-17 Thread geoff

D. Chester wrote:

> I don't think it makes much difference, particularly on 160-40m and I
> have seen it done both ways.  

Having these two 250TH rf decks, side-by-side, allows me to see how
things are done, both ways.  The RF deck in what has been affectionately
dubbed the 'Titanic' by K5SWK (I was a Johnny novice, experimenting and
playing, and it was down more than it was up) has a metal bar that
screws into the inside HDVL sockets, and the top of the RF choke screws
into the center of that bar.  B+ from the RF choke is applied to each of
the two coils evenly.

The new (to me) 250TH RF deck, built by Mike Spaan/W5IMF has a
home-brewed HDVL spaced jack-bar, but the coil has only three banana
plugs on the bottom side, and the inside of the two coils are tied together.

> Actually, tying the two halves of the coil together in the middle
> would introduce less stray capacitance and inductance to the coil.  I
> think the reason for the split coil and separate connectors for each
> half is to give you the option of  metering each tube separately with
> the series fed circuit in which the coil is hot with HV and carries
> the DC plate current to the final.

It would seem, at first glance, that dual plate meters would certainly
help in neutralizing the final.

> As for the vacuum capacitor, the tank should still remain balanced if
> care is taken with the layout.  I suspect it would be more sensitive
> to unbalance due to stray capacitance and differences in lead length,
> than with all the capacitance in a split capacitor.

The plug-in coil for this rig, with 3-pins on the bottom side of the
jack-bar, also has a 50uuf vacuum capacitor across the entire coil,
presumably for  resonating on 75m.   Each side is identical in construction.

I'll take pictures, and put 'em somewhere.  It's sometimes difficult to
grasp the correct/proper words for description purposes.

As an aside, I wired the thing up, and had it producing RF this
evening.   Even plate modulated the final, and made a good contact with
Steve/WA1QIX there in Massachusetts.   HE said the thing sounded fine,
and audio was good, clean and clear.  What concerned me was that the
grid meter was dropping on voice peaks.  Now, to be fair I was driving
that final with a rice-box (TS-450S) at around 30w.  It drove the grids
to around 125mA.  I never had a problem with the Viking II driving the
other rig, using the same modulator.  I also didn't hear the modulation
transformer talk-back when I'm on the original rig, like I heard this
evening.   Was only running 200w.

I'll do some more checking, tomorrow.

Good night Mr and Mrs Ship and all the Americans at sea.
from radio station KA5THB... no wait.. wrong call ;-)

--
73 de W5OMR
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Re: [AMRadio] Mit Romoney disses Ham Radio

2008-01-17 Thread geoff

Peter Markavage wrote:
> Read the date; old news; topic beat to death several years ago; heard he
> loves ham now.

My apologies, ya'll.  Apparently, someone wanted people to think this
had something to do with the current election mess.  Guilty as charged.

--
73

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Re: [AMRadio] T-368 FS on QTH

2008-01-17 Thread geoff

Joe Crawford wrote:

> W5DPP has his T-368 for sale on QTH.com. Ad #641748. Usual disclaimers apply.

Which one, I wonder?  He's got -at least- 2, but I -think- 3 of 'em.

--
73

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[AMRadio] Mit Romoney disses Ham Radio

2008-01-17 Thread geoff

I know it's not particularly pertinant to AM operations in Ham Radio,
but it affects Ham radio, in general, and worth the read.

We hams have it bad enough, when we try to get support for our hobby
from those that regulate it.  To have an aspiring politician (I don't
care if he's running on the one-eyed, purple polka-dotted people eater
ticket, he's still a politician) who's trying to become president of
this nation, utter such a sentence, would certainly be a blow to ham-dom
and the entire 'needed' community in case of a disaster.

http://ema.arrl.org/article.php?sid=802

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-Geoff/W5OMR

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Re: [AMRadio] Home-brewing construction considerations

2008-01-17 Thread geoff

[EMAIL PROTECTED] wrote:

>> I understand that the circuit would no longer be 'balanced' were that
>> condition to occur.  It would go back to being balanced if a pair of
>> capacitors at half the required value were used, and where the two meet
>> in the middle were tied to the stator of the Butterfly.  THAT would keep
>> it balanced.  That's the reason for the split-stator capacitor across
>> the final, now.  But, that's not my question...
>>
>> 
> Hi Geoff, how ya' been?
>   

Having a ball playing radio, can ya tell? ;-)

> I understand it's not your question, but if I understand you correctly, I
> beg to differ on a few things you stated above:
>
> 1) A single capacitor plate-to-plate wound probably not upset the balance
> appreciably - in fact if the cap, and connections to it, were totally
> symmetric it wouldn't at all. The fixed vacuum caps I've seen have an
> outside and an inside cylinder, so stray capacitance to the surroundings
> from the outside cylinder would probably be larger than the strays to the
> inside cylinder. However, as long as the cap was reasonably spaced from
> surrounding stuff, I don't think it would be of any practical consequence
> on the lower bands where you'd be using the auxiliary fixed cap anyway.
>   

I wouldn't have thought so either if it had been anyone else who made
that recommendation.  But, it's hard to argue with a ham who's 'been
there, done that' and has built up -many- kW rigs, always paying
particular attention to minute details.

If John/WA5BXO says it, I believe it. 

> 2)If you were to use two caps, with a common connection tied to the rotor
> of the butterfly cap (you said stator - did you mean rotor?)
No, I meant the part that doesn't rotate.  The 'frame', if you will. 

> , their values would need to be double (not half) the value of a single cap, 
> because they are effectively in series.
>   

I want to add enough capacitance across each side of the butterfly,
equally.  I'm pretty sure I want half of the values.
 If (for example) the total capacitance that's used across the entire
tuning capacitor is 50uuf, then each side has to be 25uuf, with the
single mounting point on the frame of the capacitor... the part that
doesn't rotate.  Is it not called the 'stator'?  Common sense tells me
'rotor' is the part that -moves- ;-)

> Good luck with the new RF deck - are you replacing the old one, or
> completely different/new transmitter?

It'll be in addition to.  I believe what I'm gonna do, is use the
double-connected racks to house,
2 power supplies, the 250TH modulator and the original RF deck, on one side.
1 power supply the new RF deck, a 19" rack of (4) 6-position coax
switches and an R-274 receiver on the other side.

The coax switches will be used to select exciters and finals.  With a
totally adjustable bias supply for the new (to me) final, it would do
fine in either Class B, for a linear (being driven by a rice-box), or
Class C for high-level plate modulation, driven by the Viking II.

I've still got a lot of thoughts in my head... this is just the
preliminary thinking.
Bottom line, I'm trying to conserve space in the shack. ;-)

--
73

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Re: [AMRadio] Home-brewing construction considerations

2008-01-17 Thread geoff

jeremy-ca wrote:
> Have you considered rebuilding for parallel operation and use a relay
> switched toroid input and a pi-net out? There are 6 band circuit
> boards available.
>
> It makes band changing a lot easier when the deck is shielded. Im
> converting a similar era deck that way. A further benefit is a coax
> fed antenna to further minimize stray RF radiation.
>
> There should be no problem getting to 15M with a standard air variable
> based upon the tube output C, the cap minimum and strays. I'll be
> using a vacuum variable and coverage will be 160-10M.
>
> With the tubes enclosed you will also need some fan assisted air
> exhausting.
>
> Have fun, 250TH decks seem to be everywhere lately.

Thanks for the suggestion and ideas, Karl... but I -rarely- get on 40m,
and I think once, in the last 10 years, even possessed a desire to even
want to 'try' 15m.  Besides, for anything above 20m, I can always run
the Viking II barefoot.  I've never been the 'gotta-have-high-power' type.

Besides, I've got extra plug in coils for the three bands this amp
covers.  The bottom is RF shielded and the three grid coils are
hand-wound, and 90 degrees out of phase with the output coil.

--
73

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Re: [AMRadio] Home-brewing construction considerations

2008-01-17 Thread geoff

John Coleman wrote:
> Hi Geoff:
>   In my opinion, the coils should be tied together in the middle as
> close to the coils as possible, either on the male bar or on the female bar.
> RF current flows on the wires between the coils so it is imperative that the
> wire be capable of handling the skin effect and current of the RF which is
> much greater than the DC/audio connection from the top of the RF choke. So
> rather than making two connections to the RF choke, where you would need to
> make large wire and have RF flowing though it, just make one connection with
> flexible wire and join the coils together at the coils.
>   

So, just to be crystal clear, a piece of wire between the coil halves
-on the coil assembly itself- would be better.
I could just add another pin in the middle of the coil assembly then add
a socket which would be connected directly to the top of the RF choke.

Thanks, John.

Hopefully, one of these days, the 'moderation bit' will be lifted off my
AM Reflector account, and mail will get to the list a bit quicker.

--
73 = Best Regards,
-Geoff/W5OMR

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[AMRadio] Home-brewing construction considerations

2008-01-17 Thread geoff

In a balanced push-pull Class C RF Final with plug-in coils, I've seen
things done a couple of different ways.

One is, to split the B+ so that the potential is fed with the B&W HDVL
jack-bar to the inside of the two coil's.  The outside of the coils is
then connected to the tubes.  That's the way the home-brewed 250TH final
I'm running was done, back in the mid '50's.  There was also a couple of
finger-stock pieces across the B&W butterfly tuning condenser to
facilitate adding a vaccuum capacitor across it for allowing the circuit
to resonate on a lower frequency (like 75, or 160m).

I understand that the circuit would no longer be 'balanced' were that
condition to occur.  It would go back to being balanced if a pair of
capacitors at half the required value were used, and where the two meet
in the middle were tied to the stator of the Butterfly.  THAT would keep
it balanced.  That's the reason for the split-stator capacitor across
the final, now.  But, that's not my question...

I recently picked up another home-brew 250TH final that has had more RFI
considerations involved in it's construction (than the one in current
operation) as it was built sometime in the '60's.  Screen and mesh
aluminum, etc... It's nice and hopefully will keep me out of the
neighbors TV's, microwaves, blenders, etc... (grin) But the plug in coil
is what prompted me to this question:

Is there a difference in feeding each of the inside sockets on the
jack-bar with B+ from the top of the RF plate choke, vs having the two
coils tied together, in the middle, and feeding B+ there?

I understand that the potential is the same, but for the sake of having
less stray capacitance and a 'cleaner' RF environment, which would be
better, and please... tell me why?

Thanks!

--
73 = Best Regards,
-Geoff/W5OMR
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Re: [AMRadio] Viking Desk Modulation

2008-01-15 Thread geoff

Todd, KA1KAQ wrote:
> On Jan 15, 2008 2:24 PM, Jay Bromley <[EMAIL PROTECTED]> wrote:
>   
>
> Think we either worked recently or at least I heard you up around
> 3870-3885 one evening. The new call sounds very familiar. You used to
> have a K5 call, if I recall correctly.
>   

It was a KA5 call, and I still miss that 'Dog Gone Ham'  ;-)

But, W5JAY works just as well.  Easier to remember his call that way ;-)

--
73 = Best Regards,
-Geoff/W5OMR
(ex KA5THB)

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Re: [AMRadio] TBW 800 Hz Power Supply

2008-01-03 Thread Geoff/W5OMR


jeremy-ca wrote:


All I have up at the moment for the Viking I is a 75M sloper off a 
tower. My other antennas are still all wired into the regular station 
in the basement. All this snow caught me unprepared.


and poor Todd/KA1KAQ is missing it, because he's down in Tampa (or was, 
at least)


BTW, Carl - I've seen an ART-13 in operation, once.  The auto-tune 
feature was a work of art.  Just remember to keep the knobs 'locked' 
when you invoke the auto-tune feature.  Ask Gary/WA5FWC what a pain in 
the ...neck... that was ;-)



--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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[AMRadio] blast from the past

2007-12-26 Thread Geoff/W5OMR


REWARD OFFERED

A REWARD OF 500 MICROFARADS IS OFFERED FOR INFORMATION
LEADING TO THE ARREST OF THIS DESPERATE CRIMINAL: HOP-A-LONG
CAPACITY

THIS UNRECTIFIED CRIMINAL ESCAPED FROM A WESTERN PRIMARY
CELL WHERE HE HAD BEEN CLAMPED IN IONS AWAITING THE GAUSS
CHAMBER.

HE WAS CHARGED WITH THE INDUCTION OF AN 18 TURN COIL NAMED
MILLIHENRY WHO WAS FOUND CHOKED AND ROBBED OF VALUABLE
JOULES. HE IS ARMED WITH A CARBON ROD AND IS A POTENTIAL
KILLER. CAPACITY IS ALSO CHARGED WITH DRIVING DC MOTOR OVER
A WHEATSTONE BRIDGE AND REFUSING TO LET THE BAND-PASS.

IF  ENCOUNTERED, HE MAY OFFER SERIES OF RESISTANCE. THE
ELECTROMOTIVE FORCE SPENT THE NIGHT SEARCHING FOR HIM IN A
MAGNETIC FIELD, WHERE HE HAD GONE TO EARTH. THEY HAD NO
SUCCESS AND BELIEVED HE HAD RETURNED OHM VIA A SHORT
CIRCUIT.

HE WAS LAST SEEN RIDING A KILOCYCLE WITH HIS FRIEND EDDY
CURRENT WHO WAS PLAYING A HARMONIC.



For Those Who Understand, No Explanation Is Necessary.
For Those Who Do Not Understand, No Explanation Is Possible.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Season's Greetings

2007-12-24 Thread Geoff/W5OMR


Rick Brashear wrote:

Here's wishing everyone on this fantastic reflector a very Merry Christmas.
I hope Santa fills your stockings with all kinds of radio goodies!
  


Merry Christmas, Rick, and all y'all.
(a true southerner knows that the plural of 'ya'll' is 'all y'all' ;-) )

And a Happy New Year!

Heavy Metal Rally is... when? 29th/30th?

--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] ER Magazine

2007-12-18 Thread Geoff/W5OMR


[EMAIL PROTECTED] wrote:
"'  Kalifornicate'"   



 Thats a new one to use .. klc
  


Was new to me, too.  I checked Google for the term...

Results *1* - *10* of about *983* for *Kalifornicate*. (*0.15* seconds)

Apparently, it's -out there-


--
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is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] bandplan thoughts

2007-12-18 Thread Geoff/W5OMR


Peter Markavage wrote:

Well, thanks for this rather enlightening view of the ARRL/big three and
ARRL/FCC ongoing conspiracies. It adds a new dimension to the "X-File"
syndrome. It also seems clear that some don't really have a clear
understanding of the dealer/manufacturer relationship but that's also
probably another conspiracy. I'm also happy to see that we can inject
some humor into our posts from time to time.
  


Mock and scoff all you want, Peter.  The relationship between the ARRL 
and radio manufacturers is undeniable.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Transformer Rewind

2007-12-16 Thread Geoff/W5OMR


jeremy-ca wrote:
The input coil is common to all bands in the 75A1, the secondary is 
then fed to the band switch.


Check the antenna coil primary first and then the secondary for 
continuity. Rewinding shouldnt be that hard if the form hasnt been 
destroyed. The hardest part will be removing it from the assembly.


A couple of decades ago, I accidently dumped a few hundred watts of RF 
directly into the front-end of an SX-73, on 75m.  The input coil took 
the brunt of the damage.


John Mohn/W5MEU(sk) told me to come out there and get some 24ga copper 
wire to re-wind that coil.  Very carefully, I removed the phoenelic 
board from the turret in which the coil was installed, then ever 
so-much-more carefully, removed the coil from the board.  There was a 
spot on the coil that -wasn't- burnt, so I was able to count turns, and 
re-wind the coil.  Luckily, I was working at Southwest Research 
Institute at the time, and was able to utilize a small-wattage iron, 
some organic stripper and a magnifying glass to re-solder the connections.



--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Transformer Rewind

2007-12-16 Thread Geoff/W5OMR


Jim Wilhite wrote:
Dave, contact Gary/WZ1M at [EMAIL PROTECTED] 
He has done work for me and does a good job.


Jim/W5JO 


Gary's gonna be a busy beaver, since the announcement that Peter Dahl in 
El Paso has closed it's doors and is taking no more orders... and their 
shelves are empty of transformers.



--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] bandplan thoughts

2007-12-16 Thread Geoff/W5OMR


Peter Markavage wrote:

You said: "Explain to me why CW is no longer a requirement for a Ham Radio 
license"

This question really should be addressed to 


But, it wasn't.  You beat the ARRL drum rather loudly, Pete.  I (and 
others) have been saying the same thing about the ARRL and the 
YeaCommWood bunch for a while, now.  The manufacturers whine and 
complain that they are not selling enough radios.  They strike a deal 
with the ARRL (need I remind you, that the FCC consideres the ARRL as 
being -the- "voice" of Ham Radio?) and give them 'x' amount of dollars 
if they lower the licensing requirements so more people can become hams 
and they can (*gasp*) sell more radios.


Pure economics 101, with some back-room lawyering going on.

YeaCommWood tells the ARRL "here, we'll do -this- for you if you'll do 
'that' for us", the ARRL slips the bribe in their pocket and then rares 
back on it's hind haunches and tells the FCC that Amateur radio needs to 
do 'this and that', gets it done, and now Johnny Novice no longer has to 
draw a schematic of a transmitter, he can chose from multiple guess 
answers, or Johnny Novice no longer has to know CW faster than 5wpm to 
use Voice on HF, or (latest) Johnny Novice now no longer has to know CW 
at -all- to get a Ham License and it's all done, Pete, in the name of 
'selling more radios' so that the 'shack on a belt' crowd can spend 
their money on the new YeaCommWood radio that costs as much as an 
economy automobile! 

A 5 digit price-tag for a SSB transceiver?  For that kind of money, the 
damned thing had better grow legs and change the cat's litter box!  ;-)




 I bet the SSB crowd would love to hear carriers with digital signals riding 
over them.


I'm all for 2.5kc of deviation and FM as a viable mode on 75m, when 
signals warrant and selective fading doesn't totally screw up the signal.


Jim/WD5JKO (of this list) had a problem with RFI in his telephone, and 
he switched from Amplitude Modulation to Phase Modulation on his QRO'ed 
CE-20A.  I couldn't hear much difference on my receiving end, but his 
claim was that there was no longer 'other voices' in his wife's 
telephone conversation.


Something to think about.

--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


73 = Best Regards,
-Geoff/W5OMR
(Home in San Antone)

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Re: [AMRadio] ER Magazine

2007-12-15 Thread Geoff/W5OMR


A.R.S. - WA5AM wrote:

On Dec 15, 2007 6:44 AM, Geoff/W5OMR <[EMAIL PROTECTED]> wrote:
  

Peter Markavage wrote:


Back in the "good old days" real hams didn't need Elmers.

  

The 'good ol' days'?

We're talking some 40 years ago.  How far back does one have to go to be
in the 'old days'?





Well Geoff, I'd say it's a relative thing.  Your "good old days" may
not be the same as other people.  Sound reasonable?

  


I wasn't trying to start an argument, Brian...  just stating a fact ;-)

*I* won't even classify the days when *I* got my ticket as 'the good ol' 
days', as I didn't get licensed until 1984.  However, being born in 1958 
to a ham that already had 20 years of hamming under his belt, I grew up 
in what I consider to be the 'good ol' days'.


That was back about the time they finally let 40m be something other 
than a 'CW Only' band, and included 'fone.  It was about the same time 
hams got access to 15m (after giving up what has often been referred to 
as 'the best DX band hams ever had - 11m), and 5m got moved to 6m, 
because of the popularity of television.  Channel 1


In my childhood, there were BC-610's, there were DX-100's, there were 
Heathkit Cheyanne/Commanche twin mobile radios, there were xtal 
controlled aircraft radios somewhere up in the VHF range - don't 
remember if it was 6 or 10m...  there were SX-28's, 
RME-somethingoranothers, homebrewed gear up the wahzoo and more parts 
than any one person could ever shake a stick at.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] bandplan thoughts

2007-12-15 Thread Geoff/W5OMR


Peter Markavage wrote:

You said: The "real" (ed. "real" I'll assume this is your own personal
definition) ham who can build a transmitter and receiver is ignored.  CW
is archaic!  A.M. is simply  a  bunch of guys who reject change.  To me,
there is something inherently wrong with this." 


Lovers of homebrew, CW, AM, Digital, QRP, Packet, Contesting, traffic
nets, etc. are all "special interest" groups of ham radio operators. The
ARRL has said on a number of occasions that as long as there is interest
in these activities, the ARRL will continue to support them. The "etc"
probably includes dozens and dozens more. Trying to maintain an equitable
support for all them at the same time can be a monumental task even for
the ARRL.


Are you saying that the ARRL, while saying they'll support the 'special 
interest groups' as long as their used?


Explain to me why CW is no longer a requirement for a Ham Radio 
license.  CW is -still- being used on the ham bands.  Removing CW from a 
Ham Test doesn't sound, to me, like it's a mode that the ARRL supports. 


What's next? 3kC AM?


And, really... what's all this hoopla about, anyway?  Haven't we already 
discussed (to death) the lack of enforcement on existing rules and 
regs?  So, someone is running 2.5kW on positive peaks on his AM rig.  As 
long as the rig is as spectrally clean as possible, and the station is 
run with good 'common sense', no one is ever going to say a word about it. 

There's been -so- much discussion about how to properly measure PEP, and 
there are those 'hams' out there that SWEAR their (_insert_mfgr_here_) 
SWR/peak-reading/ohm/volt/amp/watt meter is the absolute -best- but the 
bottom line is, if there is still so much controversy about HOW to 
measure PEP, who's going to set the standard as far as figuring how 
-wide- an AM signal is?  More importantly, 'who cares'?  6kc of AM for 
hams is the 'standard'.  Sure, you can generate a 15kc wide signal, but 
if the remote receiver is only set to 3, or 4.5kc to remove adjacent 
channel interference, who's gonna hear it?


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR/5 New Orleans

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Re: [AMRadio] ER Magazine

2007-12-15 Thread Geoff/W5OMR


Peter Markavage wrote:

Back in the "good old days" real hams didn't need Elmers.
  


The 'good ol' days'? 


~~~
*What AM Is To Me*

by John E. Coleman, WA5BXO

*O*perating AM is not about communicating using the most efficient mode 
of transmission or the latest technology. It is about technical 
understanding of what is really happening in one's transmitter. Not just 
the standard old definitions but down in the nitty-gritty. It is about 
understanding the technology of old and new. It's about understanding 
why one circuit is better suited for a job than another even though both 
have the same definition. It is about home-brew equipment and 
modifications. It is about fellowship and a gentleman's mannerisms. It 
is about fun in learning. It's a little new stuff mixed with some 
nostalgia and used in a mode that is pleasurable to the operator and the 
listener.


Sounds a lot like Ham Radio in general.

Don't misunderstand me, there is a lot more to Ham Radio than operating 
AM. There are so many aspects of Ham Radio that I'm sure I could not do 
the list justice. For this I am glad. Ham Radio has always been the 
seeds of electronic and communication technology. And I hope it 
continues to be.


Somewhere deep in my brain are the memories of the days of learning and 
wonderment. I can not forget the first time I saw the bottom of the 
Sears 1950 TV as the repairman went in with his meter and hand tools to 
repair the set so that I could watch Roy Rogers and Dale Evans on the 
next Saturday Morning. All the tubes glowing and how did it get in there 
(the picture and the sound) I asked myself and many others. Then later 
while in high school and having upgraded to general class, I was 
privileged to not only see some of the greatest radio transmitters to 
have ever been home brewed, but I was known by the men that built them 
on a first name basis. Walking in to the shack of K5SWK in the evening 
to see the 833s and 866s glowing and to hear the feedback from the 
modulation transformer and slight hum of the pole pegs is a memory that 
will always make me stop what I doing and ponder the nostalgia. Do I 
operate AM because I can't let go of a childhood memory? You bet I do. 
And I hope to stir some of those memories in others if possible and to 
plant some seeds of my own.


Many Thanks and 73 to those Elmers

Wayne, W5FJS
Otis, K5SWK
Tom, K5IBW
Koby, K5MZH
Jake, K5IQV
Bill, WA5DWXGene, WA5ATH
Gene, W5HQJ
Roy, W5MRY
Steve, K5LTK
Ronnie, K5MKB
Don, K4KYV

This is just to name a few and I know that a lot are silent keys and 
some have changed their calls. But I will always remember them with the 
calls heard first.

~


Pete, John either just made, or is going to make 60 years old, this 
year.  He got his novice as a freshman or sophomore in high school.  
We're talking some 40 years ago.  How far back does one have to go to be 
in the 'old days'?



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Re: [AMRadio] bandplan thoughts

2007-12-13 Thread Geoff/W5OMR


Todd, KA1KAQ wrote:

My recollection of the whole digital mess was more a concern of
unattended operation being allowed, along with puzzlement as to why we
needed robots sending email over amateur frequencies, inevitably of a
commercial nature in some way(s), not unlike the perceived need for
BPL, to carry internet activity.


Oh, yeah... that's -exactly- what I want...
An automated digital system, consuming 15kc of spectrum, delivering spam 
mail via amateur frequencies telling me I need to increase my *manhood*.



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Re: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Geoff/W5OMR


Robert Lawson wrote:

Geoff,

Yep, "we" did go through that a few years ago at length,


When I said "we", I was referring to John/BXO and I (as in replying to 
his message).  John, Otis, and someone else, forget now who it was... 
Steve/K5LTK, perhaps, ordered some D-104 cartridges.  In fact, I think 
they were the JT-30 replacement crystal cartridges, which have a very 
similar sound to them, if not a bit 'richer'.


With the right amount of EQ, any microphone can be made to sound -at 
least- acceptable on the air.


John, in particular, came up with an RC network, incorporating some 
inverse feed-back on a 12AX7 mic preamp that flattens out the audio 
response on most any crystal element mic (like a D-104 or JT-30, etc...)

http://www.qsl.net/wa5bxo/xtal-mic-eq.gif


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Re: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Geoff/W5OMR


John Coleman wrote:

Does anyone know if someone is making and selling the cartridges for the
D104.
  


I thought we went thought all that, a few years ago, and Otis bought a 
few (several?) Crystal Element cartridges.


Does he have any left?  Time to go visit the Ancient One, anyway...

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Re: [AMRadio] Building

2007-12-02 Thread Geoff/W5OMR


Greg wrote:

Small world:
I have the same  70 watt modulation transformer I think.  It's for an 
FAA AM transmitter too.  Two 6146's in the modulator side to one 
4x150.  Also has a tertiary winding for the PA screen. The idea here 
is to modulate a single 4-65a.  It's the only glass tube I could find 
that matched the load impedance and has a screen grid too. If you can 
think of another glass tube that might match up, please let me know.
I had the schematic for the transmitter (TV 6?) too but lost it 
somehow. I do have the pin out for the iron. If I remember correctly 
the transmitter was made by GE but don't quote me.




811's modulating 813's, or 4-125's would utilize the screen winding.  
But, it's better than any 70-watt transformer. 

this think is open frame, every bit of 8" from end to end, around 6 or 
8" tall, and about 5 or 6" thick.  Weighs around 40 or 50lbs.




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Re: [AMRadio] Re: RCA 1:1 mod xfmr

2007-12-02 Thread Geoff/W5OMR


Mike Sawyer wrote:
If its the one I'm thinking of, I have one of those. It has a tertiary 
winding for the screens and a funky secondary max. I of 0.193 A(?) The one I 
was looking for but needs repaired is 10300 Pri. and 4300 sec. If memory 
serves me, it was used in a KW transmitter. Mine goes in my RCA ET-4336F 
transmitter. A rig that uses 813's X 805's for 250 watts, (very lightly 
rated.


Same transformer.  The one I have actually is stamped "0.198mA DC".  
Others I've seen, state "200mA" as the max secondary current.


I'm still not sure if that's where saturation of the core starts, or 
that's where saturation of the core -is-.


Otis/K5SWK uses the same transformer in his single 833 x 833's rig.

I've ran a pair of 250TH's on one, modulating another pair.  Also used 
that same transformer with push-pull 811's, and then later changed to 810's.
It took (4) 810s, with that transformer, to get the same amount of audio 
I was getting from a pair of 811's.


then again, not too sure of the condition of the 810's.  They came out 
of a foot-locker that John/W5MEU had stashed away for so long, he forgot 
about 'em (and that's not like John!)


I ran two on the positive side, and one on the negative side.  positive 
peaks were about 3:1.


My next modulator is going to contain (4) 811's in push-pull parallel.  
Maybe (6), at 1250v on the plates, and (-)0v bias.


That should take care of any asymmetrical audio.

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Re: [AMRadio] Building


David Knepper wrote:

I have one that was made by RCA.  It is rated for 1KW
Pick-up only.


the one 'what', Dave?  Modulation transformer?

Pick-up only?  has anyone seen the current conditions outside?

Currently, national radar shows the entire state of Pennsylvania as 
being snowed upon.


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Re: [AMRadio] Building


Mike Sawyer wrote:

Geoff said:
A fine and fitting job for the RCA 1:1 modulation transformer, with
5,500 ohms on primary and secondary.

**I wish I had said transformer.
  


Got one here, but it's for a similar project.  BTW, it handles a pair of 
250TH's at 2000v 'just fine'. I -do- have to run a reactor choke, as the 
secondary is limited to 200mA of DC current.  I -believe- that's where 
core saturation occurs.



If you want to get 'close enough', then, at 1500v, run 4 100TH's in
push-pull parallel in the modulator for effectively 4400 ohms,
plate-to-plate impedance, according to the Eimac tube data sheet.
According to it, a pair of 100TH's in AB(1) has a plate-to-plate load
impedance of 8800 ohms.  That's kinda high to work into a 5500 ohm
transformer.  4400 ohms is -much- closer.

**Doesn't that make quite a bit of Cg-p? You would need some large 
neutralizing capacitors because of the combined C of the parallel tubes.


In class AB(1)?  Audio, not RF.  Four 100TH's to modulate a pair.

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Re: [AMRadio] Building


jeremy-ca wrote:


Old Handbooks, especially the "Radio" version have extensive charts of 
the PP load of most tubes used a modulators and you already know that 
the VT-127A's are basically 100TH's so you can easily determine their 
load impedance. If you loaf them at 500W input using say 1700V @ 300ma 
for instance (rounded off) the mod xfmr secondary must be close to 
5666 Ohms.


A fine and fitting job for the RCA 1:1 modulation transformer, with 
5,500 ohms on primary and secondary.


Then knowing the PP load of the modulators and the turns ratio of the 
xfmr you can determine what works.


If you want to get 'close enough', then, at 1500v, run 4 100TH's in 
push-pull parallel in the modulator for effectively 4400 ohms, 
plate-to-plate impedance, according to the Eimac tube data sheet.  
According to it, a pair of 100TH's in AB(1) has a plate-to-plate load 
impedance of 8800 ohms.  That's kinda high to work into a 5500 ohm 
transformer.  4400 ohms is -much- closer.


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Re: [AMRadio] TUBES NEEDED


Bob Peters wrote:

Hi All...I need some 6DQ5 tubes.I just picked up a Gonset G76 and it has
1 in the final and 
Two in the modulator...Would like to find at least 3.  Thanks guys.


  


Contact Jim/WD5JKO.  He's got -two- G76's, and I'll bet he keeps running 
spares for 'em.


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Re: [AMRadio] Re: AMRadio Digest, Vol 46, Issue 112


Bob Peters wrote:
Ok Guys it is fixed I hope now. It was set for 30 Charectors and 
Now set for 72 ...Hope that all have it better...Jim W5JO told me 
How to fix my outlook...
  


-much- better


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Re: [AMRadio] Re: AMRadio Digest, Vol 46, Issue 112


[EMAIL PROTECTED] wrote:

FWIW,

I'm seeing the "squished" left mail also.  But only with the AM 
reflector.  Others are normal to my QTH.




I only see it on Bob's posts.

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Re: [AMRadio] Re: AMRadio Digest, Vol 46, Issue 112

Breaking all of my traditions, I'm quoting your entire post, Bob.  Every 
thing you send is that way.


-Geoff/W5OMR

Bob Peters wrote:

I have no idea Terry. No one
has ever said anything.
I think that my e mail is set
up properly..Anyone else seen
that on my posts???
The e mail that you sent back
is not that way...

Bob W1PE


-Original Message-
From:
[EMAIL PROTECTED]
t
[mailto:[EMAIL PROTECTED]
n.qth.net] On Behalf Of
[EMAIL PROTECTED]
Sent: Friday, November 30,
2007 11:20 PM
To: amradio@mailman.qth.net
Subject: [AMRadio] Re: AMRadio
Digest, Vol 46, Issue 112

Dear Bob P,

 Hi. Just a silly 
question. From a newbie.


Do your posts
always look
like the one
below? Makes them
very hard
to read, y'know.
Maybe it's a 
setting on yer email

that is goofy,
maybe it's southwestern
bell that's being looney.
either way it's really
tough
to read this squish-ed
lefthand
stuff.
When all is
done and all
is said,
at LEAST you dint
have no *&^%&&*^&
six-level-deep
imBED.

73, Terry B  KC9KEL
__
__
quote
Message: 1
Date: Fri, 30 Nov 2007
18:29:15 -0600
From: "Bob Peters"
<[EMAIL PROTECTED]>
Subject: [AMRadio] F/S Volumax
To: "AM"
,
"Boatanchors"
 
<[EMAIL PROTECTED]

v>
Message-ID:
Content-Type: text/plain;
charset="us-ascii"

Hi All, Before the nasty Bay I
thought I would give ya all a
chance at a nice
Audio Processor. Now that I am
running the Class D I don't
need it. Don't really 
Know the value but make me an

offer or a nice trade offer.
It is the VOLUMAX 4300
And I have the manual with it.
I used it on the Viking II and
on the GPT and it worked
great.

Anyway offers???

Very Best 73's
Bob W1PE
The Voice of Mesquite
www.w1pe.com

"Money is only temporary, but
radios are forever" - Jim
Little aka "the old dog"/K5BAI
unquote
__
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**
Check out AOL's
list of 2007's hottest
products.
(http://money.aol.com/special/
hot-products-2007?NCID=aoltop0
00301)
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Re: [AMRadio] ft102 arrived...

2007-11-30 Thread Geoff/W5OMR


Brett Gazdzinski wrote:

I got the first one today, and what a mess.
Another ebay special, you pay to much and get crap...
  


Something to keep you busy on those cold New Jersey nights ;-)


Well, its something to play with, and it will make a good RF driver
to excite the homebrew rigs.
  


Might be interesting to be able to operate the rig via remote... like 
up-stairs, or from a UHF talkie through a UHF receiver at the rig...


connect a generic transistor across the discriminator that would forward 
bias the transistor to ON, and connect the output to the PTT line on the 
exciter.  Rig comes on when signal received.


+/- 5kc of deviation is ~10kc of audio... into an input on the 
speech-amp.. voila!  Remote operation.


You could even possibly use one of those simple phono-oscillators that 
were floating about a while back, on some simplex frequency, and set the 
memory channel in the talkie to listen on one freq, and transmit on 
another.. so, then you've got the little phono-oscillator transmitting 
the receiver audio to the talkie... and the talkie being heard by the 
UHF rig in the house, and passed onto an input on the speech amp.


Keying is controlled by the discriminator full-quieting signal...

Technical enough?

;-)


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Re: [AMRadio] F/S Volumax

2007-11-30 Thread Geoff/W5OMR


Bob Peters wrote:

It is the VOLUMAX 4300 And I have the manual with it.


Anyway offers???
  


Here's what I found on the Volumax 4300...

in 1970, CBS Laboratories produced a revolutionary product.  The Volumax 
4300.  The first analog signal processor for maximum loudness.  It 
contains two circuits.  A special compressor, and a peak limiter.  This 
device is connected after the main slow acting compressor.  The special 
compressor is a FAST acting compressor.  Unlike the main compressor, 
this one has a medium-fast attack time, around 8.5 msec, and a 
relatively fast release time, around 260 msec.  Percussive sounds faster 
than 8 msec do not trigger the compressor and go straight through with 
their original volume level.  The syllabic sounds are compressed and the 
gain is re-adjusted very quickly due to the 260 msec.  This only works 
well if the average signal input is relatively constant - the job of the 
main slow acting compressor.  The two compressors work together in 
preventing gain pumping, and allow percussive sounds to sound loud 
because they don't reduce the gain of the second compressor (ie. their 
attack time is not altered), yet the syllabic variations are highly 
compressed and are brought up to maximum gain quickly, making the signal 
sound very loud, with a further increase of 6 dB or 4x power compared to 
not using it.


...

Thus the second circuit in the Volumax 4300 is an unsymmetrical clipping 
circuit which takes care of the negative peaks, fixing them at the -100% 
modulation level.  The 6dB improvement from this device alone is all 
totally useable since at no time will the transmitter be overmodulated 
in the negative direction, neither will it be undermodulated, as the 
average signal will always be close to the clipping level.  Every top 40 
radio station wanted one of these.  One does not really hear any 
distortion because the energy in the clipped peaks is very low - and 
what is left can fully modulate the transmitter toward -100%  almost 
continuously!


On the other side of the coin, there are these comments...


/ >I have at one site a Volumax 4300.  It's a single channel 1U AM processor.

/

/ I believe that model had the clipper diodes BEFORE the output

/>/ transformer. Self induced tilt and overshoot!
/
Yeah, its peak control wasn't that great.  But it did work ok for limiting a 
netcast.  



Mind you, these reports are from 'professional broadcasters'.

Amateur signals aren't nearly as 'broad' as broadcast professional 
stations.  Typically, an Amateur AM signal is 6kc wide.  Broadcast 
stations have a 10kc channel spacing.


Isn't there something in the Rules and regs about emission bandwidth?

Hmmm...  seems the only thing I can find, is:

(1) No angle-modulated emission may have a modulation index greater than 
1 at the highest modulation frequency.


(2) No non-phone emission shall exceed the bandwidth of a communications 
quality phone emission of the same modulation type. The total bandwidth 
of an independent sideband emission (having B as the first symbol), or a 
multiplexed image and phone emission, shall not exceed that of a 
communications quality A3E emission.


however, Part 97 doesn't not define what the width of a 'quality A3E 
emission' is.



I -did- find, however, what appears to be a reply to a petitioner.../*

10.* Regarding Petitioner's request that amateur stations transmitting 
emission type A3E not be authorized to occupy more than 5.6 KHz 
bandwidth on amateur frequencies below 28.8 MHz, _we agree with 
commenters who note Petitioners have not demonstrated there to be a 
particular problem with stations that transmit AM emissions. Moreover, 
the Commission has previously declined to restrict bandwidth for AM 
because to do so would be inconsistent with the basic purpose of amateur 
service and our desire to offer amateur operators the opportunity to 
experiment with various types.



It appears that currently, an AM transmitter can have a width of <6kc.

I feel, as Amatuers, we should probably limit ourselves to something 
around the 6kc area, just to be 'neighborly' to our near-frequency 
neighbors, as to reduce the amount of bickering and bitching on the 
band, which would lead to a much more enjoyable environment to all hams, 
regardless of what mode we are on.


_/

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[AMRadio] direction of the list (WAS: Rinaldo's bandwidth suggestion)

There certainly -has- been a lot of name-calling, finger-jabbing and 
back-biting going on, lately.  It doesn't look good, as a reflection on 
-us-.  Sometimes, we rationalize it as 'replying-in-kind', which 
basically boils down to "(s)he started it!" 


Surely, we're better than THAT!  (aren't we?)

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Re: [AMRadio] Re: IARU - VP ARRL contact by WD5BZO


Bob Peters wrote:

Don...Did you forget us guys in the 50's  that had Extra
Class Freq's as Generals and that we got sold down the
river With Incentive Licensing
You talk about not getting kissed. All of a sudden we
were looking at a 20WPM test...Just to gain back what
we had!!! Took me till late 80's to get there...


Don was talking about AM Specific issues.

But, my Dad fell in that category.  He held a Class A license, back when 
there were such things.  He never knew that the bottom 25kc of 40m was 
no longer available to him. (He had gotten off of HF for 10 years, back 
from the early to mid 60's till the mid 70's.)


Along about the late 70's, he was working some CW down around 7.020 or 
so, and at one point (as the story goes) the other operator told Dad "I 
hope you're enjoying your Novice Ticket".


Dad didn't figure out what that meant, until he got a notice from an OO, 
that said he was out of his frequency range, for his class license.


He looked up the current rules, and sure enough, there it was... Dad was 
an Advanced Class license holder, and not an 'Extra'.


He bitched about that for a year, or better.

--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Re: Beer can silliness


D. Chester wrote:
I remember hearing W2OY when he was on the air.  Dick, W2UJR(SK) wrote 
up a story published in The AM Press/Exchange, about his friendship as 
a JN with Mike.  According to Dick, many of Mike's eccentricities were 
a big put-on, and actually  he was a nice guy in real life.  He just 
got a big kick out of playing his over-the-air persona.


No Kids, no Lids, no Space Cadets, no School bus drivers... ;-)

There was a thread a while back on Mike, and a link to someone's 
recording of his 'infamous' CQ...


--
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is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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Re: [AMRadio] OT: Greenbay/Dallas


David Knepper wrote:
Thank you for this information - very much appreciated as I follow 
basketball closely.


as in you root for the 4-10 76'ers?

(said from the comfort of home, where we enjoy the 13-3 World Champion 
San Antonio Spurs)


;-)

Ok, ok... enough - back to AM Radio.

AM Radio, where if you're a Time-Warner subscriber, you can only 
'listen' to the Cowboy/Packer game on WOAI 1200kHz AM.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
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-Geoff/W5OMR

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[AMRadio] Welcome K1KQ


Not to be confused with KA1KAQ :-)

Nice to work you this morning, Roger.  Your 756Pro had a GREAT AM signal 
into San Antonio from the Buda/Kyle area (south of Austin).  I can just 
imagine what the signal will be like with the Collins rig and the 813's amp!


We're on most every morning on 3.880, so when you get through with your 
20m sched, c'mon down!  You'll generally find Perry/W5KGZ near Beaumont, 
Wayne/W5DWP in Vidor, TX, Yogie/KC5MIP, Jon/AD5HR, Jerry/N5CBW, 
Geoff/W5OMR (when he's in town) and sometimes others, depending on the 
day.  More, of course, on the weekends and holidays.


Come on back, every chance you get!

I'm still searching for a place to watch the Cowboys/Packers game, this 
evening...


--
Driving your AM Rig without a scope,
is like driving your car at night, without headlights. (K4KYV)

73 = Best Regards,
-Geoff/W5OMR
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Re: [AMRadio] Halli HT37 Phasing Mod problem

[EMAIL PROTECTED] wrote:

Geoff,
I seem to be getting very good carrier null but then the sidebands are not
correctly spaced in frq.
When in AM DSB mode the modulation is not symetrical and has af response issues. Everything aligns good up to the RF phase ballance adjustments where the variable C phase trimmer works but the Variable L trimmer has no effect.
Looking at the related 12AT7s with socket extenders shows

no change in the L side tube no matter how the trimmer is adjusted. I may not
have these trimmers at the proper range
but it's difficult to tell just what that is from the manual.

It's near impossible right now for me to remove the box again and do
component testing with major Rheumatoid Arthritus
issues.

You might have to get a neighborhood kid over, Bill, to help you with
that. What it sounds like to me is, that the little coil has a broken
wire either in the windings around the form, or at, or near the legs, if
adjusting the coil makes no difference in audio phase.

Break out the magnifying glass!

Speaking of which, sometimes Harbor Freight (if you have one of those
near-by) has a clamp-on, lit, magnifying glass for such delicate
projects. Last time I saw one there, it was reasonably priced at around
$20.oo (19.95+tax).

Good luck!

--
Driving your AM Rig without a scope,
is like driving your car at night, without headlights. (K4KYV)

--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] ARRL Great Lakes Director on IARU Bandplan


Todd, KA1KAQ wrote:

The main difference is, you have faith and trust in the ARRL. I do
not. Apparently most other hams feel the same. Otherwise the ARRL
would count 80-90% of US hams as members, instead of 20% or so.
  


count me as one who 'does not' have faith in the ARRL.

Even in a democracy, majority rules.

I do not believe that the ARRL holds the best of intentions for the 
whole of the Amateur community.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] IARU - VP ARRL contact by WD5BZO


I agree with what Van said:


Pete.  This whole issue has gotten totally out of control.  In my opinion.
Responding to the kind of comments  made by Todd is a waste of time.  This
whole business is a non-issue and some people have just too much time on
their hands.  Van, K7VS


... but, one more thing needs to be cleared up, which *might* remove the 
ARRL sponsored blinders off of your eyes...


Peter Markavage wrote:

*** The ARRL has recognized AM for years as still a "valid" mode of
operation. ... They have a vintage AM station in operation. 


Correct me if I'm wrong, but didn't some knob-twisting touristing 
visitor take and put that rig out of commission?


Why didn't someone from HQ put the AM Station 'back on the air'? (if 
took an avid AM'er to go there and make adjustments and/or repairs that 
no one at HQ seemed to know how, or desire to do.)


Actions speak louder than words, Pete. 
The simple action of not repairing the AM station at Newington spoke 
volumes to me.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Halli HT37 Phasing Mod problem


[EMAIL PROTECTED] wrote:

Hello,
 I have been trying to get this like new HT37 on the air for awhile.
 The audio phasing modulator has been near impossible to properly ballance 
espeially using the manual instructions.
  


Refresh my memory (I have (3) HT-37's, but not played with any of 'em in 
over 3 years)...
is the problem you're having not being able to -null- the carrier 
completely, or is it just that the carrier isn't nulling in the spot 
where the book says it should?


All three of my HT-37's will null, but in different spots.

Sometimes, the back-and-forth for the two carrier null adjustments is 
rather tedious.



--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Subscribe to the ARRL ?


David Knepper wrote:
  Next time, someone member of my family or a friend has a birthday, I 
will use an email card electronically generated - how cheap can one 
get.  I guess you like an electronically QSL card, too. 


Again, David... just because that's the way -YOU- do things, doesn't 
mean that the rest of the world should follow in your footsteps.


I will make my -own- decisions, thankyouverymuch.

I'm cheap?  Perhaps.
I'm not arrogant.

--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Subscribe to the ARRL ?


David Knepper wrote:

In all due respect, on what authority do you make such a statement?

If someone takes the time to write a letter with first class postage, 
I read it.




I am not you, David.  Just because that's something -you- chose to do, 
do not automatically ass/u/me that everyone does things the same way 
-you- do.


Make no mistake, I am in charge of -my- life.  Therefore, under the 
authority of being the primary care giver of myself, I make that 
statement, and I'll live by it, too.


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Subscribe to the ARRL ?


[EMAIL PROTECTED] wrote:
Individual mileages may vary on this subject, but a letter, sent via 
USPS Registered Mail, Return Receipt Requested, will most likely not 
result in it being tossed.  The ARRL doesn't know if it's a donation, 
subscription or garbage.  Doubtful they will trash anything resembling 
"business".


And (to quote popular east-coast vernacular) how much of a pain in the 
scrote is that, vs just writing the mail, stuffing an envelope and 
sticking a stamp on it to let the local postal carrier pick it up and 
deliver it? 

NOW you've involved the process up getting out in the real world, 
hauling yourself to the postal orifice (never mind the cost of gasoline 
now, and normal wear-and-tear on your vehicle) but sending Registered, 
return receipt requested mail requires -more- money!



I say 'flood their email inboxes'.

--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Subscribe to the ARRL ?