[Lowfer] WSPR-15

[JD]

I would just use upper sideband for WSPR-15, Stan.

It is nominally possible to use CW and tell WSPR to look for an 800 Hz BFO, 
then tune the receiver to the actual center of the "normal" WSPR slot 
(137.500 for 2200m).  That way, the frequency displayed on the decodes comes 
out correct.  This often works great for WSPR-2 on the WSPR 2.12 software, 
in fact.

HOWEVER, there are drawbacks to this method for either WSPR-2 or -15 when 
using the WSPR X software.  The latter program implements a funky type of 
AGC in code. It gets confused and may saturate if you don't give it 
something resembling full SSB bandwidth.

Now, contrary to what you may read on the Web, the detection algorithm does 
not "need" the out-of-band noise to detect signal correctly. The extra 2+ 
kHz of wasted bandwidth [and dynamic range] is merely an artifact of amateur 
practice in using SSB transceivers to generate these signals. Unfortunately, 
the WSPR X AGC method seems to enshrine this wasteful approach. It does 
appear to make WSPR-2 detection less sensitive to received signal 
variations, but as I observed last night on 630 m, it also allows strong 
signals in the WSPR-2 band to chop up (and thereby utterly preclude 
detection of) any significantly weaker signals in the -15 segment.