[R-390] Best approach for SSB mod on R-390A

[Richard]

For SSB on my R-390A I use a HP312A Selective Level Voltmeter.   Works 
like a champ, weighs in at canoe-anchor level, and has a nixie tube 
display.    For more esoteric purposes, such as DRM, I use an outboard 
down-converter to take the 455KC IF to audio frequencies and run it into 
the PC sound-card. 

73 de Richard W5SRB