Peter, Markus,
Thanks for the feedback, very useful!
I found that it is due to the secondary ferrite core that became hot. I
just checked if it is due to saturation or due to copper losses in the
windings, by applying the LF voltage (300V pp) without a load. The core
remains cold then. So it must be due to copper losses i think. So i
think i have to use RF litz wire on the ferrite core and then look what
happens...
Will go on playing on the roof now and try various configurations.
73, Stefan/DK7FC
Am 17.11.2011 22:45, schrieb Markus Vester:
Stefan,
confirming Peter's observation at
21:40: It seems that the first 5 dashes of each callsign are sent at
full power, and then there is a sudden ~ 6 dB drop in each of the
subsequent dashes.
73, Markus (DF6NM)
Sent: Thursday, November 17, 2011 6:34 PM
Subject: Re: LF: beacon to the east and west and north
and south...
Hi Stefan,
You wrote:
> ...
> Now i'm back on 136.172 kHz and will transmit all the time until
early
> morning in DFCW-90 on 136.172 kHz.
>...
Clearly visible here at Kiel, ~32 dB below HGA22.
I'm not sure but may be all your characters are
fading out by approx. -4 dB? Looks like a thermal
drop.
Peter, df3lp
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