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Steve G4WCS · 27th Nov 2019, 4:22 pm

Got this reply on a cb forum. So not a factory mod but my hunch was correct

A common mod to get more TX tuning bandwidth on the 121 is to cut the trace to the centre tap on T4 and solder a jumper from the track to the outer unused pin, I just last night rebuilt a Hygain V from a scrap board and did the cut track to T4 and replaced R150 for a 3k3 resistor and power on SSB is much better balanced across the three bands.

27th Nov 2019, 4:22 pm	#4
Steve G4WCS Heptode Join Date: Sep 2004 Location: Preston, Lancashire, UK. Posts: 632	Re: Cybernet PTBM121D4X modification ? Got this reply on a cb forum. So not a factory mod but my hunch was correct A common mod to get more TX tuning bandwidth on the 121 is to cut the trace to the centre tap on T4 and solder a jumper from the track to the outer unused pin, I just last night rebuilt a Hygain V from a scrap board and did the cut track to T4 and replaced R150 for a 3k3 resistor and power on SSB is much better balanced across the three bands.