The HTX-10 is a winner on AM. Audio sounds very nice even with the stock
mic. I love mine. Current draw is low and works great with an amplifier,
going from the 7 watt carrier to 70 watts with most good amplifiers. I
worked Japan with that rig in the truck a few years ago! When 10 is open, 7
watts
I had one of those rigs as a kid BEFORE I WAS A HAM. I used it on CB
modulated with 811A's. Then I found out about Amateur Radio. A backwards
experience. Years later I parted it out, unknowing it was so well
documented. I actually traced that thing out and drew the schematic at 16
years old. The
How about 16 KHz bandwidth at 29.0 MHz!!! There is no practical
differentiation in bandwidth between AM and FM on TEN in that portion of the
band??? I'm sure no-one would object to a 16 KHz wide AM high-Fi signal on
29 MHz AM!
George AB2KC
-Original Message-
From: [EMAIL PROTECTED]
Joe,
If you are going to cathode modulate that 4X1... Consider PDM Digital. You
will need twice the plate voltage +20% if you want 120% positive peak audio
capability. The 4-125 is the only tube in your list that can possibly hold
off the voltage and it's close at that.
FYI: I am finishing up a
Again, It would be an S1 signal above a s9/30db level noise - a barely
perceivable difference. You would have to go from 100 to ~ 6,400 watts to
get an S3 signal above that noise level. bob...w2ami
www.qrz.com/callsign/w2ami
- Original Message -
From: George Pritchard [EMAIL PROTECTED
- Original Message -
From: George Pritchard [EMAIL PROTECTED]
To: 'Discussion of AM Radio' amradio@mailman.qth.net
Sent: Monday, September 27, 2004 9:38 AM
Subject: RE: [AMRadio] WTB SB-220
When the interference is also at 30 over S9(even if it's static
crashes) a 36 dB over signal
When the interference is also at 30 over S9(even if it's static crashes) a
36 dB over signal using the 400 watts helps. First put up the best ant...
Then crank-it with juice!!!
George AB2KC
1KW 4X1 lives
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of RJ
Gentlemen,
How long will it be before the govt' adds interface devices to the BPL
home internet connection to further invade in on our privacy. I feel very
uncomfortable with potential broadband utility monitoring of my electric
meter! It opens the door to much invasion.
Live Free or die. The 20
Replace the circuit with this modification. Works well with my DX-100. The
carbon element pot is smooth and will never fail since it sees low
current. Also... Spread out the turns on the 10/15 meter 6146 grid coil pair
to get lots more grid current at 10/15 meters. If the coil turns are not
spread
Sorry for this shout-out, but my hard drive crashed yesterday. Brian, I
lost all e-mails... So please send your address and all e-mails we did about
the crystals. I wanted to send the money order today, but the info was lost.
I'll send the MO out when I receive your e-mail. Thanks,
George AB2KC
think it is harmed.
Patrick
Message: 1
From: George Pritchard [EMAIL PROTECTED]
To: amradio@mailman.qth.net
Subject: RE: [AMRadio] trade 4CX5000A for ..
Date: Tue, 20 Jan 2004 09:37:44 -0500
Reply-To: amradio@mailman.qth.net
Patrick,
I may have the pair of 304THs. I'll check tonight, and verify
Patrick,
I may have the pair of 304THs. I'll check tonight, and verify the
filaments with a valid light-up since I have a fixture set up with the
correct socket and the correct filament transformer. The 4CX5K may be
fun to play with. Do you have the socket or chimney for it??
George AB2KC
For Patrick,
I use the same tube compliment: 4X1 with the 304TLs. As far as the 4X1
screen goes... I use a huge choke, just because I had it available.
500VDC. I see the screen current bounce up from 130 ma to 175 ma approx
during modulation on the typical Simpson current meter. The signal
reports
DIDYA SELL THE CABINET?
George AB2KC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Merz Donald S
Sent: Wednesday, November 12, 2003 12:42 PM
To: amradio@mailman.qth.net; [EMAIL PROTECTED];
[EMAIL PROTECTED]; 'Glowbugs (E-mail); 'Baswaplist' (E-mail)
Is $75 ok? I was actually looking for the black plastic non-air type
socket since the grids and cathode will be at +7500V for the PDM circuit.
After thinking about it... I may be able to mount the aluminum socket on
thick plexiglass to insulate it from the chassis. Thanks for offering them
to me.
Patrick,
The 4-1000A and the 304TH rig sounds great, and will be fun to operate. I
built a rig with the same tube compliment, however... I use 304TLs to
modulate the 4X1. The TL version of the 304s will give you better linearity,
but you will need to lower the bias voltage since these have a bit
Anybody have a 4-1000A socket that they would like to sell it to me? I need
one for my Pulse Duration Modulator build.
Thanks
George AB2KC
I'm looking for a BW coil 15HDVL. Can anybody help ne on this one?
George AB2KC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Arthur E. Joly
Sent: Friday, March 21, 2003 2:37 PM
To: 'amradio@mailman.qth.net'
Subject: RE: [AMRadio] BW Coils Needed
I have
Since they didn't have polarized outlets in the old days, the plug could go
in either way. They had to fuse both sides for safety, and mandate the
chassis to be grounded. Of course these days, the polarized three pronger
guy is the best replacement ac line cord, with a fuse in the hot line only
DX100 VFO Troubles:
Drifting up during transmission: Line voltage drop during plate voltage turn
on with 600 watts pulled from the outlet may the problem. Check by first
using the spot switch listening to the beat freq on the receiver. Then, turn
on the plate voltage with transmitter fully loaded,
Use 3000 Volts max. I use a pair in AB1 Audio. No... I did not pay $85,000
for it! I would not sell it for that either!!! Having to much fun. Anyway,
No screen supply needed since they are triodes. Neutralization is a big
must. For class C, I would use 304THs since the bias requirement is higher,
Slightly off topic: My neighbor has it all. Touch lamps, cordless phones,
wireless keypads/mouses, and of course TVs. I get into all of it!
Fortunately I can demonstrate NO INTERFERENCE AT MY QTH on anything
(filters, toroids etc...). When I handed him printed info on the how and
whys of RF
The 3dB bandwidth spec may not be such a big deal. As a QRO fan of homebrew
plate modulation and HiFi... let me explain: When the FCC (or anyone for
that matter) specifies a bandwidth, the bandwidth attenuation by definition
are the -3 dB points, usually with no mention of any other attenuation
No wonder those guys talk the way they do... with all that RF cooking their
brains! Not to mention the nearby unknowing cars. They should be arrested.
George AB2KC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: Monday, August 26,
Gentleman,
If the bandwidth limit of 3.5 KHz is to be implemented (unlikely I
believe)... how unfair it would be in contrast to the broadcash stations
that obliterate our hambands with super high power double sidebands with
10KHz bandwith playing music! For this reason and others, I think that
The 1956 handbook has a very nice 500 watt class C all band 813 transmitter
on page 198. I had that item in my hands many years ago. It was given to me
by the High school I went to. I operated it and enjoyed it very much for a
couple years. It also had the 811 modulators and the supplies in a
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