----- Original Message -----
Sent: Tuesday, September 07, 2010 6:47
PM
Subject: LF: Re: 137.5kHz WSPR Tuesday
evening - reports appreciated
Roger
How can an amplifier be class D/E.
The design is totally different. A class E has a
totally different drain cct configuration and matching network.
de g3kev
----- Original Message -----
Sent: Tuesday, September 07, 2010 5:34
PM
Subject: LF: 137.5kHz WSPR Tuesday
evening - reports appreciated
My 137.5kHz WSPR TX transverter is now working fine, so I'll
be on-air with WSPR tonight (Sept 7th) from 5.30pm - 11pm UK
time.
After my success on QRSS3 with G3XIZ I'm hopeful he'll
now decode my WSPR signal tonight, assuming Chris can take a listen. If
anyone else within, say, 100km of Burwell, Cambs JO02dg cares to take a look
for the WSPR beacon (running around 35% TX time) I'd be most
grateful.
Not sure if anyone else has had this problem, but I
was using the small 16mm 3C90 cores (cream colour) as the PA bifilar
output transformer and I had all sorts of issues with the darn thing
overheating and even one cracking. I replaced this with a choke wound on a
T106-2 core and made the output network work in class D/E and now everything
is working very predictably. The larger diameter 3C90 cores seem fine in the
step-down transformer matching the "in the air" loop.
The WSPR beacon
is now going ON.....
73s
Roger G3XBM
--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM
GQRP 1678 ISWL
G11088
