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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
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