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


Rick Brashear rickbras at airmail.net
Tue Mar 28 12:31:05 EST 2006


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


Larry Keith wrote:

>I have been looking at HB AM Xmtr designs.
>
>One of the more interesting ones can be found on the
>amwindow.org web site.  It is a pair of 813's
>modulated by a pair of 813's.  That makes it
>interesting to me since I already have a stash of
>813's!
>
>The designs doesn't look too complex.  It requires
>about 5 - 10 watts of RF drive and 20 watts of audio. 
>Those should be easy enough.
>
>>From looking at the xmtr and power supplies
>schematics, it appears that the only "scare" parts are
>the modulation transformer and the Heising choke. 
>Would anyone care to comment of availiability of such
>items?  Specs shown are:
>
>Mod Xfmr -- 300 - 500 Watts, 2:1 step down.
>
>Heising choke:  50 H @ .5 A
>
>73,
>
>Larry
>KQ4BY
>
>Larry Keith 
>231 Shenandoah Trail 
>Warner Robins, GA 31088-6289 
>kq4by at rocketmail.com 
>478-329-0030
>
>
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