[AMRadio] HB Xmtr, was: Home Brew AM Transmitter Wanted


John E. Coleman (ARS WA5BXO) wa5bxo2005 at pctechref.com
Tue Mar 28 15:49:32 EST 2006


I think he's talking of the input to the modulator tubes in 20 watts to
Class B 813s with control grid and screen grid tied together. 

But I may have missed something.
John, WA5BXO


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Rick Brashear
Sent: Tuesday, March 28, 2006 2:48 PM
To: Discussion of AM Radio
Subject: Re: [AMRadio] HB Xmtr, was: Home Brew AM Transmitter Wanted

Hi Larry,

Sorry, I assumed it used plate modulation, but that's what I get for 
assuming.   I'll check on that transformer when I'm over there 
tomorrow.  Good luck with the transmitter, it sounds like a winner.

73,
Rick/K5IZ

Larry Keith wrote:

>Hi Rick,
>
>No, I got it right..  The audio (20 watts) is fed to
>to the screen grid & control grid (tied together)via a
>transformer (don't know the specs on that guy, yet)
>with one side of the xfmr going to one tube and the
>other side to the other tube..
>
>Keep me apprised on that modulation xfmr.. 
>
>Tnx &73,
>
>Larry
>KQ4BY
>
>--- Rick Brashear <rickbras at airmail.net> wrote:
>
>  
>
>>Larry,
>>
>>Did you mean to type "200" watts of audio?  I have a
>>couple of 
>>modulation transformers, but I'm not sure of the
>>ratios, I'll look.  
>>Both are well capable of 300 watts.
>>
>>Regards,
>>Rick/K5IZ
>>
>>    
>>
>  
>


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