Re: LF: DK7FC Report [Was QRP 1W /PA circuit]

[Chris 4X1RF <chrisgomy@gmail.com>]

Stefan, LF,

The correct link: http://dl.dropbox.com/u/10280270/YO/EU60_934_yo4x1rf_DK7FC_QRP_12JAN2012.jpg


73s
Chris 4X1RF

2012/1/12 Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>

Andrey, Chris, Halldór, Dave, Clemens, LF,

Thanks for the reports about my 1W beacon. I'm happy that it is clearly visible in Moscow and on most grabbers in a radius of 1000km.

Chris, the link you show below opens the same picture you posted last night. Can you do it again, pse?

73, Stefan/DK7FC


Am 12.01.2012 09:12, schrieb Chris 4X1RF:

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.<ganymede444@btopenworld.com>  wrote:
 

Stefan,

A trace of your signal visible here tonight. See attached.

73, Dave G3WCB IO91RM


  -----Original Message-----
  From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Chris 4X1RF
  Sent: 11 January 2012 21:52
  To: rsgb_lf_group@blacksheep.org
  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<Stefan.Schaefer@iup.uni-heidelberg.de>

    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