You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

Quick test. Do any of the three 'clarifier center' coils have an effect on more than just one mode? Each one should change the channel frequency ONLY on one mode, and NOT the other two. A slug that causes frequency change when turned in more than just one mode says shorted switching diodes. D32, D33 and D34 would be worth testing first when this fault arises.

Not the only possible root cause, but the first ones to check.

Oh, and the schematic shows a 11.3258 crystal in this model. Finding the 11.1125 crystal in the radio suggests the "six-position switch" channel mod has been done. Not my favorite setup. Found it to be sensitive to temperature changes.

73

[QUOTE="nomadradio, post: 763331, member: 22"] Quick test. Do any of the three 'clarifier center' coils have an effect on more than just one mode? Each one should change the channel frequency ONLY on one mode, and NOT the other two. A slug that causes frequency change when turned in more than just one mode says shorted switching diodes. D32, D33 and D34 would be worth testing first when this fault arises. Not the only possible root cause, but the first ones to check. Oh, and the schematic shows a 11.3258 crystal in this model. Finding the 11.1125 crystal in the radio suggests the "six-position switch" channel mod has been done. Not my favorite setup. Found it to be sensitive to temperature changes. 73 [/QUOTE]

Top Bottom