Stefan, LF,
Best reception was at local sunrise in YO:
http://dl.dropbox.com/u/10280270/YO/EU60_930_yo4x1rf_DK7FC_QRP_12JAN2012.jpg
73s
Chris 4X1RF
On 1/12/12, Dave G3WCB. <[email protected]> wrote:
> Stefan,
>
> A trace of your signal visible here tonight. See attached.
>
> 73, Dave G3WCB IO91RM
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Chris 4X1RF
> Sent: 11 January 2012 21:52
> To: [email protected]
> Cc: Stefan Schäfer
> Subject: Re: LF: QRP 1W /PA circuit
>
>
> Stefan,
>
> Signal clearly visible in YO:
> http://dl.dropbox.com/u/10280270/yo4x1rf_DK7FC_QRP_1w_11jan2012.jpg
>
>
> 73s
> Chris 4X1RF
>
>
>
> 2012/1/11 Stefan Schäfer <[email protected]>
>
> LF,
>
> Last night i shot my PA again :-( No replacement FETs were available so
> i had to stay quite during the night. Replacement parts are ordered now and
> will arrive tomorrow :-)
>
> During that time i will run a LF beacon on 136.172 kHz running 1W TX
> power in DFCW-90, starting in the afternoon. If someone can receive that
> weak QRPP signal, then a report is very apprechiated :-)
>
> Also i will do some optimisations on my recently posted PA output stage
> (http://dl.dropbox.com/u/19882028/LF/DK7FC_137kHz_TX_antenna_and_PA_schemati
> c.jpg), just in case someone wants to build a similar design and is
> interested in general:
>
> -R= 100 Ohm/2W (In series with C, across Drain-Source)
> -C= 220pF/WIMA FKP-1 2kV (In series with R, across Drain-Source)
> -MOSFET: The IRFP460 will be replaced by a SPW20N60C3 :-)
>
> 73, Stefan/DK7FC
>
>
>
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