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 mat
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
t
The RCA 1:1 ratio mod xfmr @ 5500 was made for liberty ship transmitters
during WW2. It was not designed for voice, but for MCW, so it was meant for
running a single tone, and is not high-fidelity. That's why its audio
quality is on par with the lowest cost "ham radio quality" modulation
tr
Built myself a small shortwave transmitter, somewhere around 3 Mhz
(I'll double-check when I'm back in my office on Monday). Only a
couple of components, and wondering how far it might reach! So if
there's anyone on the list up for trying some pirate DXing from
Ireland lemme know; I can organise QS
- Original Message -
From: "Brett Gazdzinski" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Saturday, December 01, 2007 9:26 PM
Subject: Re: [AMRadio] Building
I have a push pull paralell 100TH mod deck, and its the worst
sounding mod deck I ever bui
I have a push pull paralell 100TH mod deck, and its the worst
sounding mod deck I ever built.
You need a lot of driving power, and into an unstable load.
Now I have run rigs with a pair of 100TH tubes as modulators, and it
sounded fine.
I have tried various voltages, mod transformers, resting curr
Geoff said: In class AB(1)? Audio, not RF. Four 100TH's to modulate a
pair.
**Dee-da-dee! Although, I think somewhere in the book by Mr. Langford-Smith,
the author touches on the topic of reducing harmonics at audio freq.
Personally though, that's a little overboard. My goal is to make 833 X
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.
--
D
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
I have one that was made by RCA. It is rated for 1KW
Pick-up only.
Dave, W3ST - W3CRA
Collins Radio Association
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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.
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
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 @
- Original Message -
From: "Barrie Smith" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Saturday, December 01, 2007 5:12 PM
Subject: Re: [AMRadio] Building
- Original Message -
From: "jeremy-ca" <[EMAIL PROTECTED]>
To: "Discussion of AM Rad
The G76 uses a pair of 6DQ6's as modulators, and a 6DQ5 as
the output tube.
The 6DQ6's are set up as zero bias triodes, with the supressor grid
acting as the signal grid i think.
Great receiver though, with its 262khz IF, but it could use a better
audio amp, I made one using a small IC chip that
- Original Message -
From: "jeremy-ca" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Saturday, December 01, 2007 2:45 PM
Subject: Re: [AMRadio] Building
- Original Message -
From: "Barrie Smith" <[EMAIL PROTECTED]>
To: "Discussion of AM Ra
Anthony W. DePrato wrote:
Well just to start if off. i am cleaning shack and have sold about 300
units so far. still have a way to go. found a NIB tanny for a Alpha 89
Amp. and a BIG box full of Varicap. now i have been wanting a big
tuner for a long time so i have the caps. now to find the r
- Original Message -
From: "Barrie Smith" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Saturday, December 01, 2007 2:27 PM
Subject: [AMRadio] Building
Well, I was building a new HV power supply, until I had my gallbladder taken
out last week! Not supposed to lift anything
Bob, looks like you just needed an adjustment on Outlook, huh? Great!
Just gotta make sure you have sufficient bandwidth, I guess, hihi.
73, Terry KC9KEL**Check
out AOL's list
of 2007's hottest products.
(http://money.aol.com/special/hot-products-2007?
Hi Bob,
That is exactly backwards of what my manual shows. 6DQ5 Final, 6DQ6
modulators. I checked it out and the 6BQ6 and 6DQ6 look pretty
similar and have the same pinouts. Mine was subbed with the 6BQ6s.
I also found a skizmatic showing a 676G as a final. What that is I
have no clue.
Ok, I'll take the abuse on this one. While you are in there checking
the size of the email width by character number, check your message
action section. This is where you can modify your email so that you
don't send the entire original message back to the email list. Click
the box that blocks r
Well, I was building a new HV power supply, until I had my gallbladder taken
out last week! Not supposed to lift anything over 20 lbs for a month.
It's a resonant-choke supply. I was just to the point (with a bunch of taking
out and putting in of parts) of drilling the mounting holes and finis
This one's still sitting at $49.99, and no bids. Hope it doesn't end up in
the "landfill". Should be worth that much for parts, rack and panels.
Bidding ends to-day.
It's located in Kane, IL, on highway 67, about 50 miles north of St. Louis.
350 miles is too far for me to travel; otherwise I
Jack..The schematic calls for 6DQ5's in the mod and 6DQ6 as the
final..That was what is in the rig as well...
Could this be a different variant XCVR...
Bob W1PE
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jack
Sent: Saturday, December 01, 2007 10:25 A
Hey Norm,
Welcome! The way 75 meters has been stretched out so far this
winter, we'll look forward to hearing you down south.
I'm frequently amazed at how well those Apaches communicate with 100
watts. Lum, K5AYD, and his "Worldwide Apache" is a good example. I
hear him talking to the W
Hi Norm,
Welcome to the group. You will find a lot of help here for the Heath
stuff. If Glenn/K9STH doesn't pop up here to tell you about the paint,
you can email him on his site. He has that information.
http://k9sth.com/
Bet you have had some snow. Been a while, but I think I worked y
Hi Bob,
Check the modulator again. Should be a pair of 6BQ6s.
You will enjoy the rig, its a fun radio.
73,
Jack
On Dec 1, 2007, at 10:01 AM, 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
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.
--
Driving your AM
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.
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
Bob,
You've got it fixed! Much, MUCH, better!
Bob - N0DGN
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...
Bob W1PE
-Original Message-
From: [EMAIL PROTECT
Bob,
Sometimes it's all crunched to the left and sometimes it's not. I just
assumed it was because you were operating from different computers, set up
differently. It happens with other folks too.
Rick
I have no idea Terry. No one
has ever said anything.
I think that my e mail is set
up properl
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
--
Driving your AM Rig without a scope,
is like driving your car at night, without headlights. (K4KY
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...
Bob W1PE
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Geoff/W5OMR
Sent: Saturday, December 0
[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.
--
Driving your AM Rig without a scope,
is like driving your car at night, without headlights. (K4KYV)
--
73 = Best Regar
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
--- VJB <[EMAIL PROTECTED]> wrote:
> Date: Sat, 1 Dec 2007 07:32:27 -0800 (PST)
> From: VJB <[EMAIL PROTECTED]>
> Subject: IARU
> To: [EMAIL PROTECTED]
>
> Jim Weaver KJ8E
> Central Division Director
> ARRL
>
>
> Jim,
>
> I have received a copy of an email you have sent
> out,
> possibly to yo
I started on a universal modulation deck about a week ago. Settled on a pair
of 810's. Mod tranny is a 600W Multi Impredence by Stancor. Power supply will
deliver 2500V and will have a 1A 50H modulation choke. Should be done with it
by end of year. Then I'll begin on my new Class C.
and I buil
Looks like your page size is set to about 3-4 in wide.
Greg W5RY
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Peters
Sent: Saturday, December 01, 2007 8:54 AM
To: 'Discussion of AM Radio in the Amateur Service'
Subject: RE: [AMRadio] Re: AMRadio Di
FWIW,
I'm seeing the "squished" left mail also. But only with the AM
reflector. Others are normal to my QTH.
-Original Message-
From: Bob Peters <[EMAIL PROTECTED]>
To: 'Discussion of AM Radio in the Amateur Service'
Sent: Sat, 1 Dec 2007 9:53 am
Subject: RE: [AMRadio] Re: AMRa
Hi All!
I'm new to this list. I'm Norm Palin, K7NCR. QTH is
Kalispell, MT, NW part of the state.
I'm working on a new/old AM station, having put my
Knight Kit R100A/T150 pair on the back burner for now.
I've recently completed the upgrades to the audio
chain in a really nice Heath Apache I got las
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
[E
Fully restored R390-A with lots of spare parts and tubes.
Thanks,
Bob,W4WSZ
[EMAIL PROTECTED]
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T-368 complete with spare tubes and spare iron.
Thanks,
Bob,W4WSZ
[EMAIL PROTECTED]
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