Message-ID: <504FAA9D.2040900@iup.uni-heidelberg.de>
Date: Tue, 11 Sep 2012 23:18:21 +0200
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: MF PA
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Hi Christian,

OK, that sounds not to bad. However 10W may be a bit high without a 
load. I would guess there may be a non-optimal gate voltage or a small 
overlap time in which both FETs are conducting.
Never mind. As long as the PA works now it's fine.

Will you be on the band tonite?

Currently i'm attempting to get a first OP32 decode on 137 kHz at UA0SNV 
which is 5760km over land. Not so easy...
After the sunrise at UA0SNV i'll be on MF to test a new band pass filter 
that i was building today. Probably that's to late to expect any 
activity then. But if you want to try again, i would also build up the 
TX part, not only the RX...

73, Stefan/DK7FC

> Hi Stefan,
> Ok, I recognized the problem with the foto and had to resend my mail without:-)
> Meanwhile my tx is back on the air.
> I think the methode with the bulb is ok for mf as it works also well on sw bands.
> Key down without load?
> In this case I have an Input of only 10 watts versus 120 with load...
> Transformer stays at very moderate temperature even when I operate with 25 volts/25 amperes.
> Before I used t130-2 which got very hot..
> 73, df5qg
> Christian Groeger
>