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_schematic.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
