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LF: Re: Re: 137.5kHz WSPR Tuesday evening - reports appreciated

To: <[email protected]>
Subject: LF: Re: Re: 137.5kHz WSPR Tuesday evening - reports appreciated
From: "mal hamilton" <[email protected]>
Date: Tue, 7 Sep 2010 19:16:32 +0100
References: <[email protected]> <000b01cb4eb4$caf14380$0401a8c0@xphd97xgq27nyf>
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ps
A class D is a broad band amp whereas a class E is a narrow band amp, totally different design
g3kev
 
----- 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


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