This is a brief demo of the Kenwood SM-220 showing how to use it to set mic gain and compression on SSB signals and also how ...
KB2LJJ Radio Mods Database
Radio Mods Database and Manuals
Modification for the Kenwood SM-230 SM-230 Band scope attenuator
Author: Trio-Kenwood Communication, inc.
Service Bulletin no. 970 (29-5-1990) When the SM-230 is used as a band scope, the attenuator circuit is bypassed. Sometimes it is necessary to use the attenuator during strong signal reception or high noise conditions. The following modification will allow the attenuator circuit to function in the band scope mode. Required parts: W05-0309-00 ATT SUB-UNIT 1. Disconnect the power cord patch cords. 2. Remove the top cover (6 screws). 3. Remove the Horizontal unit's mounting screw and secure the ATT sub-unit with the supplied 2.6mm screw washer.
4. Remove connector P12 from the Horizontal unit and insert it into jack P1 on the ATT sub-unit. 5. Insert connector JA from the ATT sub-unit into jack P12 on the Horizontal unit. 6. Insert the two wire plug, supplied in the kit, into jack P2 on the ATT sub- ...