Brain,
I appreciate your comments but unfortunately looking over the traffic
for the last several months too high of a percentage is nothing to do
with helping other hams, tech info, etc. The packers and beer cans
comes to mind recently and I could go on.
When I post something technical I u
I thought the moderator put this whole thread to BED.
ENOUGH ALREADY!!
W3LW
At 05:47 PM 11/29/2007, you wrote:
Frankly I don't care which among ARRL officials passed
along a specific bandwidth number at the IARU
conference in Brazil. It should not have been uttered
without clearing it with
Mike,
My book indicates, like many National receivers, on D band a single
loop of wire inside of the coil is bent to add/subtract
inductance. I just looked at my RF input coil (opened it up) and
there is the wire.
The wire is accessible through the left rear hole, looking from the
top of t
Someone earlier in this thread indicated he didn't like open wire
line. My W7FG line here to a 274 ft center fed doublet at about 55
ft has been up at least 7 years, Only maintenance is occasionally
I'll break a connection at the horizontal to vertical transition, I
have the tensions now so
a: Cable companies are struggling to make systems that work. Notable
exceptions are Comcast and Time Warner. For the most part they have
working systems but many others suffer from aging infrastructure (20+
year old buried aluminum jacketed coax for example). Here in the
Philly area I have V
This time with the link.
Larry
Steve is correct.
The modulation is linear with 8 level vestigial sideband transmission
(the carrier( at -11 dB from peak sideband power) is only .3 Mhz from
the lower edge of the channel) and uses a 3-2 data rate allowing a
19.39 megabit data stream to be sent
Steve is correct.
The modulation is linear with 8 level vestigial sideband transmission
(the carrier( at -11 dB from peak sideband power) is only .3 Mhz from
the lower edge of the channel) and uses a 3-2 data rate allowing a
19.39 megabit data stream to be sent in a 6 mcs bandwidth
channel.
ER or from
Antique Radio Supply or direct from Jay Miller the author at
[EMAIL PROTECTED] I know that ER still has some left. When is your article
coming out???
Bob W1PE
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Larry Will
Sent: Monday, October 08, 20
Monday at 3805 at 8 PM EDST
- Original Message - From: "Larry Will" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Monday, October 08, 2007 8:57 AM
Subject: RE: [AMRadio] AM in Iraq?
Hi Bob,
We talked some time ago regarding my upco
Radio Supply or direct from Jay Miller the author at
[EMAIL PROTECTED] I know that ER still has some left. When is your article
coming out???
Bob W1PE
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Larry Will
Sent: Monday, October 08, 2007 7:58 AM
To: Discu
r the 26Deltas did a fine job when we were
using them.
Jim
WB2FCN
Sgt Boo to my friends, I don't have any live enemies!
- Original Message - From: "Larry Will" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Sunday, O
E
The Voice of Mesquite
www.w1pe.com
"Money is only temporary, but radios are forever" - Jim Little aka "the
old dog"/K5BAI
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Larry Will
Sent: Sunday, October 07, 2007 7:17 PM
To: Discussion o
Hello All,
My personal experience in Vietnam (1967-68) in the Army SigC is AM
voice was already dead. It doesn't and never did work in the high
noise levels near the equator. Enjoy AM in the winter but it is just
isn't an comm medium when near 100% copy is required, unless you are
WKBW or W
Hi,
I found on a National RX one time that the oscillator was on the
wrong side. If it should be high, it was low or visa versa. Be sure
that is not your case as that will make tracking impossible.
Larry
W3LW
At 01:03 AM 9/26/2007, you wrote:
I have a pristine NC-183D I picked up a year ag
Hi Gary,
Unfortunately this group all too often gets on a tangent about some
re-hashed thing INSTEAD of doing what the list is for - helping
others make better rigs.
For those of us who have been there - done that its way to much of
nothing. Folks need to get a life.
Thanks for your supp
Rick,
RF connections are never made of ferrous material (steel). The
tubing normally is either nickle or silver plated brass or
copper. Check it with your magnet. The companies that make
broadcast station ATU's have it and maybe you could bum a small
quantity. Kintronics and Phasetek. Th
Tom wrote:
Where is a good location to order high voltage cable rated for at
least 2kv or more?
The good stuff is Belden 8866. That's 18 ga picture tube wire rated to 40 kV.
Any of the usual Belden distributors should have. I use it in the
UHF TV transmitters for the 30 kV IOT tube power
I'll be bringing a Hammarlund HC-10 sideband adapter amoung other things.
Our gang is at 737-739.
Larry W3LW
__
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/li
Jim,
Well its all about drop and mains "stiffness".
I am sure with your short run, ampacity is all you have to worry about.
My RCA BTA-1R1 manual calls for #8 for each conductor. I use #10 and
my run is comparable to yours. My TX branch feed is from a submain
fed with #6. The #6 run (150
At 06:59 PM 5/9/2007, you wrote:
"3) ...provide #4 or larger primary wiring from entrance box to transmitter".
Brain,
I forgot to mention.
If you size the wire for the current, the 5% rule comes in at about
125 feet IF I remember correctly.
Larry
W3LW
_
I've been reading the Gates BC-1T manual and found two instances where
> they state that #4 wire should be used.
Brian,
There are two considerations for wire size. See NEC Code books
The first is ampacity - the current carrying requirement.
The second is voltage drop - the length of the run.
Jack,
A dipole is only 73 ohms in free space away from ground etc. A
typical low antenna such as we hams might use often is 50 ohms or
even lower. The various antenna handbooks have a lot of info on this.
A 1/4 wave vertical series fed monopole over perfect ground is also
about 37 ohms.
the PTO end point adjusted, but this is a horse of a different
color. I wonder if this is a common problem with the SP-600? Any ideas?
Thanks,
Rick
Larry Will wrote:
That may be within 1 gear tooth, I am not sure.
Mine is maybe 1/4 division off.
That may be within 1 gear tooth, I am not sure.
Mine is maybe 1/4 division off.
Larry
At 05:27 PM 12/28/2006, you wrote:
Thanks Larry, that's exactly where it is. The right dial is 1/2
division off, I hope that's close enough.
Rick
Larry Will wrote:
Rick,
The upper scale o
Rick,
The upper scale on the main dial is the logging scale coupled with
the bandspread. With the main dial rotated to its left end and at
the mark before the first 0 in the main dial logging scale, the right
dial should be approximately on zero. On re-assembling the gear
train, as I rememb
Hi All,
As a TV broadcast engineer we simply used standard off the shelf
picture tube HV wire in a conduit for the 30 kV klystrode HV (up to
10 amps on black picture) AND we used RG-214 for the return (which
was a bit above actual ground) also in conduit for the return. This
system has been
Hi,
CNA-30501 is a Navy part number. My RBL-5 has some CNA transformers
but that number is not one of them.
Regards,
Larry W3LW
At 06:04 PM 11/28/2006, you wrote:
I have a transformer labeled CNA-30501 which I believe is from
national. I can't find it in my limited national parts catalogs.
Hi Brian,
Think of 220 in your house this way (I am assuming you are not in a
commercial facility with 3 phase power)
At the power pole the secondary of the stepdown transformer is 240V
AC end to end with a centertap. The centertap is grounded and
becomes the neutral in your main power pane
John,
See NEC 250.134(B). There is a discussion in my NEC handbook showing
why the safety (ground) conductoe should be run with the neutral and
hot conductors. Its for making a low impedance for cancelling
magnetic fields. You can have a ground stake as you have but you
should also have th
Hi Said Jim, I meant John..
Another advantage, in tracing down excessive noise on 40 M with a
ham buddy in Maine this summer I found several cases of neutrals and
grounds tied together (at locations besides the main panel)
throughout the house and shack. Clearing those (and some other
stu
Hi All,
John is correct. See NEC 250.138 and 250.140. It was common in old
equipment (my Heath SB220 is a good example) to have the control
circuits (PTT Relay) use the grounding (green) conductor for a
return. No longer permitted.
4 conductor plug/receptacle required. The green wire (gr
For conduit I suspect.
lw
At 09:00 PM 10/19/2006, you wrote:
OK, see why these are selling cheap. The sizes listed on the outside of the
package are not what's inside. Supposed to be 1/2, 3/4, 1 & 1 3/4 inches.
More like 7/8, 1 1/16, 1 5/8 and 1 11/16. Also. something very starange
with t
Hi,
I have been running a BTA-1R1 on 160 for several years now. It was
written up in ER awhile back. Contact me off the reflector and I'll
fill you in. I "grew up" on this transmitter.
Larry W3LW
At 07:30 PM 9/6/2006, you wrote:
JUST GOT AN RCA BTA-1R. AM LOOKING FOR SITES WITH INFO RE 1
But thats dangerous in itself. The resistor could open and wala no
ground and worse you would never know it. All RCA rigs (and I worked
with klystrons at 20 to 32 kw and PS of 10 amp capable had direct
hard wire shorting sticks with flex welding cable like ground wire in
clear tubing easily i
Good advice Phil!
Larry W3LW
At 09:59 PM 5/30/2006, you wrote:
- Original Message -
From: "VJB"
> Several people have asked me, over the past 10-15
> years, whether it is "better" to preserve an old
> broadcast transmitter as-is or modify it to make it
> more useful in a second life on
ower still applied to the motor and
gearbox. It appears this is the factory installation, but maybe
it's been modified?
Rick/K5IZ
Larry Will wrote:
Rick,
Its a typical WELL INSULATED flex shaft coupling with the required
size holes. The full 3.1 kv B+ is on the rheosta
Rick,
Its a typical WELL INSULATED flex shaft coupling with the required
size holes. The full 3.1 kv B+ is on the rheostat.
Larry W3LW
At 02:29 PM 5/23/2006, you wrote:
To all owners or those familiar with the BTA-1R series of transmitters:
The "Power Raise/Lower" variable resistor (1R405)
Steve,
Your points are correct and well taken but not the whole story. No
doubt that F2 skip can be very low angle and rhombics used at HF are
designed for that. (Takeoff angles of say 2 to 10 degrees with good
suppression above that) And local bcsting on 26 MHz would have
trouble with F2 s
Hi all,
Think AM. At WCZN we used a .42 wavelength vertical which has great
null suppression at medium elevation angles. (20-40 degrees as I
remember without looking it up.) See any text on vertical radiators.
Larry
At 12:43 AM 4/28/2006, you wrote:
>they are using a custom TCI-designed
Hi all,
Resonance
Commercially, antennas are built for the task and pattern, match follows.
If you think about it, one cannot obtain resonance of a straight
dipole at every frequency in 75-80 meters (or 10 meters for that
matter). By the equations (there are 3 definitions of resonance by
t
The large inductor probably will have less loss than the
torroid. Also if overdriven, torroids can generate harmonics.
Larry
At 06:22 PM 4/18/2006, you wrote:
Tried a large balun and a 10 turn inductor, both worked; now I need to find
out which method will work the best, great learning proc
The RCA BTA-5xx is essentially the size of two BTA-1R's bolted
together. The cabinets do separate so would fit in 2 pickups with
still room for the removed iron.
a 1R1 hauls easily in a Ford F250.
Larry W3LW
At 09:42 AM 3/20/2006, you wrote:
On 3/18/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Hi John,
Yes that is fine.
Larry
At 01:41 AM 3/14/2006, you wrote:
This is what I have so for guys, and Larry I quoted you as well hope it
is OK
http://wa5bxo.shacknet.nu/XFMR_losses/audio_transformers1.htm
Now Bacon, You know I can't spell. If any thing is right on that page
it is because
on, WA3WDR
- Original Message -
From: "Larry Will" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" ;
"'Discussion of AM Radio'"
Sent: Monday, March 13, 2006 1:24 PM
Subject: RE: [AMRadio] Class AB and B audio XFMRS
> Hi all,
>
> As I
Hi all,
As I dimly remember from Motors and Machines 1 and 2, THE TRANSFORMER
IS A HIGHLY NON-LINEAR DEVICE. WE USE THESE SIMPLE FORMULAS for TR
and ZR but in reality YOU NEED ADVANCED CALCULUS TO adequately
explain BOTH THE Hysteresis and eddy current losses and
distortions. The open circu
Jim,
Not quite. All NTSC encoded video is essentially 320 x 240 and VHS
with its AM "color under" system makes it even worse because of color
artifacts in the luminance. 640 x 480 which is a SMPTE and ITU
standard is only possible with RGB component systems where no
NTSC encoding has taken
Hi Bob,
Brought the SX-101 into the shop today and fired 're up. Working OK
but I'll check alignment.
Ranger next.
Haven't seen the manuals yet in the mail. Did you send them??
Mentioned u to W1LI. He might drop you a note.
73,
Larry W3LW
Hi Bob,
Got home yesterday but with a slight
Hi Bob,
Got home yesterday but with a slight cold. Haven't looked at the units yet.
Good meeting you and I'll pass along to Lew Wetzel W1LI when I hear
from him. as we discussed.
Larry
At 01:17 PM 2/1/2006, you wrote:
FOR SALE:
Plug and Play. Complete working station. Hallicrafters SX
Hello all,
Its time to end all this "stuff" on here and get back to
technology. The place to make your voice heard whatever your option
is, is the FCC formal comment process. HOWEVER, as one who has
commented in numerous FCC proceedings in other matters, poorly
written comments or statement
which is just a
second-order Sallen-Key. I got a comment on how narrow
the signal was, and yet it sounded clear because of
upper midrange boost. The millisecond range time
constant of the servo-clipper avoids a lot of high
frequency harmonic generation before the audio hits the
filter.
Bacon, WA3WD
Bacon,
I'll pull out a copy of the NRSC spec on the AM B'CST audio shelving
filter when I get a chance and pass along some details.
Larry
At 11:16 AM 1/11/2006, you wrote:
Any distortion of the modulating waveform causes
harmonic distortion and therefore splatter. The
sharper a waveform
Bacon,
As usual your explanations are correct. Broadcast AM stations gave
up on high level negative clipping long ago because of splatter out
50 kcs or more even before the almost universal switch to Class D
systems. The best high level plate modulated system while pretty
good as in the BTA
10v units
for 813/814/805 family.
Any suggestions would be appreciated.
Bill KB3DKS/1
-Original Message-----
From: Larry Will <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]; Discussion of AM Radio
Sent: Sun, 18 Sep 2005 10:41:41 -0400
Subject: Re: [AMRadio] Drying out HV transformers / Chokes
Don,
Here is the section in my article from ER
Magazine on rebuilding an RCA BTA-1R1 on the
homemade over I used with great sucess. all you
need is a thermostatically controlled hotplate a thermometer and a hood.
from my RCA BTA-1R! article in ER
A check of all the iron with a 1000V 100
But.. To get the correct input power (required in broadcasting) you must
measure plate current not cathode current. Properly insulated meters are
safe and reliable. I agre its either static or magnetic field problem.
W3LW
W3LW
At 02:11 AM 1/2/05 -0400, you wrote:
John, thank you for this.
I agree.
Downward power indication with modulation indicates negative carrier shift!
Larry W3LW
At 05:11 PM 10/11/04 -0500, you wrote:
> It's normal for power to deflect downward on AM during modulation. You
have to
have a peak reading wattmeter to see the peaks. Sounds like you have
Don,
I just completed a static DC tube tester for 4CX150 and 4CX250 tubes that
uses HV and is set up with adjustable bias, screen, and plate along with
appropriate metering and cooling. I can set the screen and plate voltage
to match the load curves in the TT manual, and adjust the bias per t
Hi Don,
The 6AN8 is a 9 pin miniature not a compactron.
Larry W3LW
At 09:49 AM 4/1/04 -0500, you wrote:
Here is the list I come up with after searching the web and getting all of
your replies. Some people expressed an interest in the 6T9 tube and I
think those are available cheaply from AES.
.
Larry
At 11:15 AM 5/24/03 -0400, you wrote:
Quoting Larry Will <[EMAIL PROTECTED]>:
> Powell,
>
> Have fun with the RCA's. I am finishing up a rebuild of a BTA-1R1
> here. Nice box with good audio. If you are lucky it has the later plate
> and mod xformers which a
Powell,
Have fun with the RCA's. I am finishing up a rebuild of a BTA-1R1
here. Nice box with good audio. If you are lucky it has the later plate
and mod xformers which are very reliable. Made by Electro-Tech as I recall.
I megged, baked, and redipped some of the other iron pieces in mine.
Sure sounds like TV set radiation to me. Color subcarrier is 3,579.545
kcs. Hor rate is 15,734.26 kcs.with lower sidebands at +/- 60 hz from each
15 kc burst.
Larry W3LW
At 07:00 PM 4/12/03 +, you wrote:
A few days ago, a new interference appeared on 80m. It consists of rough,
60kHz
Hi Steve,
Thanks for the plots and good advice on the electrolytics. I have seen
that problem on vintage BC equipment often.
I have excessive distortion on the HiZ output along with assym mod
indications not seen on the actual RF envelope viewed directly off TX
output. I should have no troub
Hi all,
I have a Harris Model AM-80 modulation monitor that I need a copy of the
book. Does anyone have one I could photocopy?
It is giving me a few problems and nothing is labeled inside. I will be
using it on 160.
Regards,
Larry W3LW
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