Re: LF: WSPR without an SSB TRX ?

["James Moritz" <james.moritz@btopenworld.com>]

Dear  Pete, Chris, LF Group,

----- Original Message ----- 
From: "M0FMT" <m0fmt@yahoo.co.uk>

...>If you mix the 1500hz tone up to 500 kc/s conventionally don't you get 
+/- 1500hz tone as the product. i.e. upper and lower sideband?
Yes...

...>Thus the reason I suggested a Tayloe (for the want of a better 
description) detector in reverse which resolves the unwanted sideband issue. 
I dont think a straight forward product mixer will do.
That is essentially what G4JNT's simple phasing upconverter design ( 
http://www.g4jnt.com/LFUpconv.pdf ) mentioned previously does.

...>A simple phase modulator using two 8meg xtals by G3ZJO is shown on a web 
page the URL in my last mail.
Well more of a frequency modulator, but this generates a 1500Hz modulated 
audio output from a PIC code generator. I think G3XIZ already has the 1500Hz 
modulated audio available from his existing PC, he just needs a way to get 
it onto 500kHz.
Cheers, Jim Moritz
73 de M0BMU