by simply unloading the final to draw less
current, thereby reflecting a high Z to the modulator. It makes the audio
really smooth but a lot less PEP.
John,
WA5BXO
will be hot
with DC and audio. Don't forget to bypass the screens to the cathodes,
not to ground.
None the less, it is a very nice project and would deliver very nice
audio.
John,
WA5BXO
of the phase splitter to the grids of the output tube
with out using the differential amp in between.
73, John,
WA5BXO
with .01 ceramics has made the most
deference. I'd found in the past that the filament lines can be the
transport path for RF parasitic oscillations and that electrolytic
capacitors don't bypass HF very good.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL
Are you using the stock driver circuit with the driver XFMR on the 32V3?
John,
WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Brett gazdzinski
Sent: Sunday, March 26, 2006 8:42 PM
To: 'Discussion of AM Radio'
Subject: RE: [AMRadio] Modulator
Theres one in Yuma, AZ that is free, for pick up. I saw it on the March 15
Broadcast Forum.
http://lists.radiolists.net/pipermail/broadcast/2006-March/028794.html
the 'order' button.
And they'll happily send you one 1/4-20 3/4 bolt, or a warehouse full
of shelving - an ounce of glue, or railroad tank cars of cleaner - all
with the same efficiency.
Okay - McMaster-Carr commercial over now...
Cheers
John KB6SCO
documentation although we are getting
better. We tend to fly by the seat of our pants when it comes to making
changes or designing something. But if you're interested I will try to
find the hen scratching we did on some stained coffee napkin and copy it
for you.
John,
WA5BXO
-Original
Yep, there is no doubt that the pair of 3-500Zs and getting rid of
the control carrier on the DX60 would be better but a lot more expense I
think. Aren't 3-500Zs pretty expensive?
John
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jim candela
modulated rigs in the older
handbooks and you will get the idea.
Good Luck John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Harry Vaught
Sent: Friday, March 17, 2006 7:13 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] Amplifier to use with my DX
Cheers
John KB6SCO
modulation
characteristics. So the combo is equivalent to a DX100 with maybe better
audio.
John
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jim candela
Sent: Friday, March 17, 2006 1:48 PM
To: Discussion of AM Radio
Subject: RE: [AMRadio] Amplifier
(no
permanent magnet)? Not much sound comes out until the DC goes in to make
the magnetism for the voice coil to work against.
John,
WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Rick Brashear
Sent: Thursday, March 16, 2006 9:43 PM
To: Discussion
position) and building an external plate modulator for it. And it will
sound a lot better. It is a really cheap project too.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Alan Beck
Sent: Thursday, March 16, 2006 8:34 AM
To: Discussion of AM
I love this stuff!
John, WA5BXO
-Original Message-Not in its entirety.
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Bruhns
Sent: Thursday, March 16, 2006 10:12 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] Class AB and B audio XFMRS
Magnetic hysteresis
T60. The T60 had the same control carrier AM that the DX60 does. What
a difference it made when it was plate modulated. Very little modification
is necessary in the DX60 to accommodate the external modulator.
John,
WA5BXO
nose is runnin' and my feet's are smellin'
John, WA5BXO
On Sun, 12 Mar 2006, W5OMR/Geoff wrote:
John Coleman ARS WA5BXO wrote:
How difficult would be it be 'sweep' the mod iron?
The reason I ask, is because so much of the surplus stuff we get is still of
Mil-Spec design. Therefore, if the mil-spec transformer says it's freq
response
) the
output will become distorted. Design the preamps and drivers low frequency
roll-off to be at or before this distortion happens.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of W5OMR/Geoff
Sent: Sunday, March 12, 2006 10:43 PM
is
not as good when the frequency becomes too low.
I hope I'm not boring folks with this and some may say I am making a
mountain of a mole hill. I just find it fascinating. I guess it is just my
type of thing.
John, WA5BXO
Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL
Thank you Larry,
I don't know the math either, but I think you gave a much better explanation
than I did.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Larry Will
Sent: Monday, March 13, 2006 12:25 PM
To: Discussion of AM Radio
Hey Dave,
I sent you a couple of emails, wondering if your spam checker has blocked them.
Did you say you had a Wilcox 96D manual? I need to get a copy of one, to
restore mine. Thanks and 73
John
K5PRO
New Mexico
Date: Mon, 13 Mar 2006 11:13:01 -0500
From: david knepper [EMAIL PROTECTED
That is a perfectly written answer Bob. May I use it on my web site? Do you
want to have Geoff, W5OMR, check it for spelling first? HIHI
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Bruhns
Sent: Monday, March 13, 2006 2:47 PM
and/or
cross over distortion.
John, WA5BXO
in the primary.
Hope this helps some one.
John,
WA5BXO
playback.
Hope this helps.
John
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Brett gazdzinski
Sent: Tuesday, March 07, 2006 8:36 AM
To: 'Discussion of AM Radio'
Subject: RE: [AMRadio] receiver tests for Theo
My recording setup is an old cassette tape
others experience and opinions. BTW,
I have three other transmitter projects needing my attention right now. I got
the Wilcox out of the truck bed and plopped it out under a roof next to my shed
this afternoon. Inside one of the front doors there is a complete parts list
and schematic!
73
John
from JRC for
casual listening right now. It also has a rather dismal audio stage.
When I was a novice back in the 1970s, I had a HQ170. What a drifter!
73
John
K5PRO
I found a good link to 3 photos of the Wilcox TX RF deck. It is certainly not
a 75 watt output rig.
Thanks to AA9TT for posting these.
http://www.aa9tt.com/Fun_Stuff/Amplifiers/Wilcox/wilcox.html
73
John
K5PRO
(not
NC300) has outperformed all for me.
John, WA5BXO
IF one rebroadcasts amateur reception, via a VHF/UHF frequency, are they
required to ID regularly, for that transmission as an AUX tranmitter?
John
companies doing TYPE acceptance
checks. It is as accurate as the dummy load and voltmeter that you have.
GL,73
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Brett gazdzinski
Sent: Wednesday, March 01, 2006 3:10 PM
To: 'Discussion
of Nebraska has Grimes lampholders listed:
http://www.surplussales.com/Bulbs-Incan-Panel/PanelLamp.html
Again, a tad pricey, and you'll have to put a 327 in them.
BTW: Google is your Friend!!
Cheers
John KB6SCO
See this
http://wa5bxo.shacknet.nu/HAMPICTURES/safety%20bias1.GIF
and This
http://wa5bxo.shacknet.nu/HAMPICTURES/safety%20bias2.GIF
Hope this helps
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of ne1s
Sent: Thursday, February 23, 2006 3
Cheers
John KB6SCO
that down... waaay too
lazy for that ;}
Also, a few folks came from a couple of other relectors, the 'private
mailing' will reach them as well.
Cheers
John KB6SCO
weight legal rig.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Brett gazdzinski
Sent: Tuesday, February 21, 2006 9:44 PM
To: 'Discussion of AM Radio'
Subject: RE: [AMRadio] 1930's Old Buzzard Open Rack
TransmitterFinallySeestheAirwaves
characteristics of the rig.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of ne1s
Sent: Tuesday, February 21, 2006 2:27 PM
To: AM Radio Reflector; [EMAIL PROTECTED];
[EMAIL PROTECTED]
Subject: [AMRadio] 1930's Old Buzzard Open Rack Transmitter Finally
.
Free for postage from zip 89706 (Carson City, NV), one to a handful.
Let's be reasonable, here folks... ;}
Drop me a line OFF-LIST if any interest.
Cross-post this to other BA Restoration lists as you see fit.
Cheers
John KB6SCO
the 40 meter band limits. You may remember
more of the specifics on this Don.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Donald Chester
Sent: Saturday, February 18, 2006 4:41 PM
To: amradio@mailman.qth.net
Subject: RE: [AMRadio] AM
wears
on...
Cheers
John KB6SCO
Hi Jim,
My understanding was.
Under the old rules stage or stages, that provide output to the antenna,
total power should not exceed 1000 watts DC input. This includes the sum of
the driver and final in the case of GG output circuit.
I think that rule was tested.
John, WA5BXO
/tutor.htm
I summarized the events which led to Barton's paper in QST in 1931, followed by
Art Collins paper in 1935 on the benefits of this approach.
http://www.amwindow.org/tech/htm/heisingorwhat.htm
73
John
K5PRO
Message: 4
Date: Wed, 15 Feb 2006 18:48:52 -0500
From: Mike Sawyer [EMAIL
know that weird stuff does exist.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Deuel
Sent: Thursday, February 16, 2006 6:05 PM
To: 'Discussion of AM Radio'
Subject: [AMRadio] Re: AM Transmitter Advice??
Hello Larry and all:
Larry's
of new (NOS, and/or tested to new spec)
tubes, a thorough RF-IF alignment, and we'll see how the Old Girl does.
I'm hoping to be rather pleasantly surprised - it sure will look pretty,
at any rate!
Cheers
John KB6SCO
On Fri, 3 Feb 2006, Jim Wilhite wrote:
John is this an R388?
Yassuh. Collins R-388, sn in the 3-digit range, was a Navy rig
originally. I have a copy of the TM for it - but it's silent on the
mechanics (or a picture or schematic) of the PTO. It does have a circuit
description, however
. All is now
well, however.
Cheers
John KB6SCO
PS: THANKS Howard
On Thu, 2 Feb 2006, Jim Wilhite wrote:
the counter. Follow the instructions for alignment.
The Instructions would be at/in/on
URL? Pointer? Secret subterranean Knowledge Vault?
Enquiring minds
Cheers
John KB6SCO
something from phosphor bronze
springy stock, or even some old EMI gasket material or finger stock.
John
K5PRO
-Original message-
From: [EMAIL PROTECTED]
Date: Mon, 30 Jan 2006 09:31:09 -0700
To: amradio@mailman.qth.net
Subject: AMRadio Digest, Vol 24, Issue 75
Send AMRadio mailing list
Oops, I hit reply and forgot to remove all the topics in my reply on the
chimney, please accept my regret! Duh!
73
John
K5PRO
.
These will be used to hold my ever-growing horde of BA Stuff - mainly
recievers and related gear.
Shipping will be to Carson City, NV zip 89706.
Pay via PayPal, MO, Cheque, Cash, potatoes, live chickens, etc.
Please get back to me privately, off-list. Thanks!
Cheers
John
-Type: text/plain; charset=iso-8859-1
Do you accept PayPal?
Regards,
Gary...WZ1M
- Original Message -
From: John Lyles [EMAIL PROTECTED]
To: amradio@mailman.qth.net
Sent: Sunday, January 22, 2006 6:01 PM
$20 for all, postpaid
GE Ham News:
RCA Ham Tips:
BTW
I would support a RM where all amateur radio licensees should have
to build there on equipment.
That should open up a bucket of worms!!
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John E. Coleman (ARS
WA5BXO)
Sent: Monday
a better driver XFMR as part of the
external circuit and go to the grids directly.
John
Coleman
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Craig Roberts
Sent: Saturday, January 21, 2006 10:19 PM
To: Discussion of AM Radio
Subject: [AMRadio] 32V-2
Speech Amp using 6AS7G, Bias PS
Sept/Oct 1948 vVIII,n3, NBFM Tx with 2E26 on 10, Hifi
May 1949 vIX,n2, Tiny Tran 10 and 11 meter 5763
July 1949 vIX, n3, Designing Modulators, RCA Voltohmyst
Jan/March 1950 vX,n1, Code Practice Unit, Electronic Keying, Overmod Ind
73
John K5PRO
New Mexico
Back Issues of Electric Radio:
#83 (march 96)
#167 (april 03)
#169 (june 03)
#178 (march 04)
#179 (april 04)
#181 (june 04)
$2 each or $10 for all, + postage
73
John K5PRO
CBS Laboratories Volumax 400, Automatic Peak Controller
with Manual, $75
Going to Albuquerque Hamfest next weekend, will also have two 12 hy 500 mA
Raytheon power chokes from RA1000 there
73
John
K5PRO
New Mexico
entertaining, if nothing else.
Cheers
John KB6SCO
Our prayers will be about you and family tonight Don. 73
John, WA5BXO
, etc.
Thanks!
Cheers
John KB6SCO
Also Jim, you may not need a BFO for CW in the phone band, HIHI.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of W1EOF
Sent: Monday, January 16, 2006 10:44 PM
To: Discussion of AM Radio
Subject: RE: [AMRadio] Web page appears in opposition
. Until I move the QTH to somewhere
with a few acres and room for Lots of Wire.
Cheers
John KB6SCO
nowhere except to a stick to hold it up off of the ground.
It doesn't take a mathematical antenna expert to experiment You only
need some extra wire.
Fun Stuff
John,
WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John Lawson
Sent: Wednesday
circuit helps a lot with this. I did with out one for years learning how to
talk by watching the scope. But it is a lot nicer and more relaxed when you
have one.
John
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of W5OMR/Geoff
Sent: Monday, January 09, 2006
, or just leave it in there - won't hurt
the electrical specs of the coil...
Cheers
John KB6SCO
and my upper would surely be crossing over when tunning on there frequency
and listening LSB.
Happy New Year to all.
John Coleman
WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of W5OMR/Geoff
Sent: Saturday, December 31, 2005 8:25 AM
To: Mike Duke
has become an SK on me... damn
Anybody have any experience to the contrary?? It's too late and I'm not
in the mood to dig around in it anymore tonight, but I really love this
radio - been with me 15 years now... ;{
Cheers and have a Merry Christmas, anyway...
John
Fave Reciever - for Ham and SWL -
Also: if you have a quote to perform the above, lemme know ASAP - I'm
'motivated' as they say in Real Estate.
Cheers and Best of the Season!
John KB6SCO
was not full of mud for 2 - 3
years.
John
WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John Lawson
Sent: Sunday, December 25, 2005 3:47 PM
To: amradio@mailman.qth.net
Subject: [AMRadio] R-388 PTO info needed
Further to my Xmas Eve Scrooge
the PTO for the KWM-2 - not the same animal at all.
Only 388 item they seems to have is a manual - and I gots one of them.
There's still the issue of RR - it's not like an R-390... ;{}
Cheers
John
John KB6SCO
to the Ameritron AL80 so I
can get closer to burning my fence down... ;}
Cheers and Best of the Season!
John KB6SCO
In the meantime here is the PST file maybe some else can deal with it.
It is a PST with just the OLDAMRADIO folder from 8/8/2000 to 12/31/2001
http://wa5bxo.shacknet.nu/oldAMradioPST.zip
John,
WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John
Here you go Brian. I included December.
Download from here.
http://wa5bxo.shacknet.nu/oldAMradio.zip
DBF and MDB
John
WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Brian Sherrod
Sent: Friday, December 16, 2005 7:42 AM
To: amradio@mailman.qth.net
I just realize that this export of the old stuff doesn't have dates. That's
weird! Can anyone explain why that would be? It has dates when viewed with
outlook while it is part of a PST, but I can't seem to figure out how to get
the date field to export to a spread sheet or a DB file.
John
My outlook folder for AMRadio shows over 10500 entries and goes back
to 8/8/2000 I can export it to
1) a dbase type file,
2) a PST for Outlook,
3) or a ASCI delimited file.
And then zip it up and post it on my server.
Which would you like?
John Coleman
WA5BXO
-Original Message
Sure go ahead
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Tuesday, December 13, 2005 5:46 PM
To: Discussion of AM Radio; Discussion of AM Radio
Subject: [AMRadio] Link to you new web layout
John, looks good. I am
post them for all the world to see and download so everyone can
benefit.
Thanks John
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Bruhns
Sent: Tuesday, December 13, 2005 5:17 PM
To: Discussion of AM Radio
Subject: Re: [AMRadio] MY new web layout
Hi
It was brought to my attention that my web page was really behind and
that I had left out some links to some very important stuff that Bacon
had done so I have corrected it now I hope.
http://www.qsl.net/wa5bxo
and
http://www.qsl.net/wa5bxo/amtech.html
Let me know if it is all OK now.
John
On Sun, 11 Dec 2005, Jim Wilhite wrote:
Use any frequency you choose and move about.
Diety knows there a quite a few hi-power SSB gorillas that follow that
exact approach
Cheers
John KB6SCO
it's easy to sit here and conjecture about
it. ;}
Cheers
John KB6SCO
or not. ;}
Cheers
John KB6SCO
The 858S is probably 5 kV DC. RF rating is more dependent on the freq and RF
current than voltage. The High Energy HH58 series is 7.5 kV.
John
K5PRO
Date: Sun, 4 Dec 2005 21:09:12 -0800
From: Edward B Richards [EMAIL PROTECTED]
Subject: [AMRadio] Data wanted
To: amradio@mailman.qth.net
John KB6SCO
)
NOW: Today I'll try and get the Valiant healthy.
What else are 4-day weekends for???
Cheers
John KB6SCO
'.
Cheers, and Happy Thanksgiving
John KB6SCO
!!! It's ALVE!!!
Damn electronics anyway. O well - need to get the Ranger and the Valiant
working - hopefully this weekend.
Cheers, thanks, and Happy Thanksgiving!
John KB6SCO
)... so if Scott can help us out on this - I'd be
happy to offer my services to him in return...
Lemme know...
Cheers
John KB6SCO
Oh, do I love not watching what the 'reply-to' is set for...
sigh
trying to acquire
something he's been drooling over since he was a Kid...
heheh!!
Cheers
John KB6SCO
On Sat, 19 Nov 2005, Patrick Jankowiak wrote:
My friend has to sell his RCA BTA-1R.
I've just called him - (nice guy!) -
He sez it's Sold
Missed it by That Much...!
Cheers
John KB6SCO
(who inteded to reply 'to the list' this time... ;}
for it to go is when the plate cap is removed. The
meter will still show screen current.
The best way is still to reduce the supply voltage at the
plate/screen modulation point. A large resistor that has a bypass cap
across it works well.
John,
WA5BXO
-Original Message-
From: [EMAIL
On Wed, 16 Nov 2005, John E. Coleman (ARS WA5BXO) wrote:
The best way is still to reduce the supply voltage at the
plate/screen modulation point. A large resistor that has a bypass cap
across it works well.
As has been wisely pointed out to me - in the case of the Ranger
line. Then I placed
a 100 watt lamp in series with a large variable 100 ohm 100 watt resistor to
ground. Not a very efficient thing to do but it did hold the bias steady on
the 805s modulator. This was long before I had access to the HV
transistors, ETC.
John, WA5BXO
-Original Message
input supply raises the voltage output just about enough to double the power
or vise versa. Then you could just forget the HV in the Ranger, as for as
plate/screen supply is concerned. Or if a guy was home brewing a modulator
of 20 watts or so, he might just use the PS from it.
John,
WA5BXO
and linear input.
And of course there a lots of topologies that will accomplish the task of
lowering the output of a tetrode or beam-power RF section without
upsetting the relative current balances.
Mebbe I oughta should by a junker Ranger... Just In Case... ;}
Cheers
John KB6SCO
I don't know if the power supply come from the same XFMR or not but what
does 10 on the knob mean?
John,
WA5BXO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John Lawson
Sent: Wednesday, November 16, 2005 8:02 PM
To: Discussion of AM Radio
Subject: Re
On Wed, 16 Nov 2005, John Coleman ARS WA5BXO wrote:
I don't know if the power supply come from the same XFMR or not but what
does 10 on the knob mean?
In the Ranger, the LV feed to it's rectifier is from two equidistant taps
between CT and the 'ends' of the HV secondary, the which ends
,
mailto:[EMAIL PROTECTED]
X-List-Received-Date: Sun, 13 Nov 2005 14:16:25 -
John (W5HG) wrote:
I have been bitten by the AM bug and would like to know what to look for at
some of these Hamfest. I know their will be all kind of opinions but that is
what I need. The first rig I bought a few
/amradio,
mailto:[EMAIL PROTECTED]
X-List-Received-Date: Sun, 13 Nov 2005 15:02:32 -
John (W5HG) wrote:
Thanks Geoff,
I have figured that much out about the latest rigs. The 100D was really bad.
I dream of finding a good tube type from some little lady that has one stuck
up
701 - 800 of 998 matches
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