Hi,  all those of you who have SPM-3s might be interested in the matching
"portable" (batt op) generator to make a matching set. A connection lead
between the two will lock the PS-3 output to the SPM-3, making it a useful
bridge source and detector for aerial measurements. Not synthasised but that
doesnt really matter for measurements. Let me know if you find a manual for
it ...I still haven't got one, and I believe Jim and Brian would like copies
too.
The item number on UK eBay is  #3808753698
Cheers de Alan