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Title: Simple Audio Mods for the Johnson Ranger Post by: Steve - K4HX on December 15, 2012, 11:24:45 AM See the attached schematic for details AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Warning: Some who have performed these mods have noticed a rise in the resting modulator current, apparently due to ultrarsonic oscillation in the modulator section. If this happens to you, try replacing the 0.02 uF across the modulation transformer with a 0.001 and 0.01 uF and/or the 0.005 across the driver transformer with a 0.001 or 0.002 uF. If the condition persistists replace the original 0.02 and 0.005 uF units. |