[AMRadio] BC1-J Mod trans. is fine.

[Evangelistic Faith Missions Honduras]

I had a problem with a Broadcast transmitter once, like this when the
negitive feed back chain was unhooked, you might check the negitive feedback
resistors and see if any of them are open, also check to see if it is hooked
up.
Don W5FFK
----- Original Message -----
From: "Bob Bruhns" <bbruhns at erols.com>
To: <amradio at mailman.qth.net>
Sent: Thursday, March 21, 2002 11:18 AM
Subject: Re: [AMRadio] BC1-J Mod trans. is fine.


> Modulator oscillation when the TX is on the antenna is probably
> caused by RF getting into the audio circuits and being rectified,
> producing audio which results in feedback.  Add RF filtering to the
> audio inputs; a few turns around those square Radio Shack cores
> helps too.  If everything is open, try shielding too (closed boxes,
> etc).
>
>   Bacon, WA3WDR
>
>
> > >> works fine into a dummy but the
> > >> modulator oscillates when into the antenna. I still need to
> clean up the
> > >> transmitter side of things. But there's hope.
> > >>
> > >> Dan
>
>
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