Midland 91-1110 Basetech III intermittent receive
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I'm troubleshooting a pair of 91-1110 VHF repeaters that both seem to exhibit the same issue: Intermittent receive.
The units will work perfectly for days, then suddenly stop recognizing a receive signal (even with a comm analyzer on freq and PL connected to the RX N connector.
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Sometimes, immediately preceeding this failure mode, the BUSY light on the front panel will illuminate with a 1 bar signal shown on the LED display.? Sometimes the machine will still work in this condition, other times it does not recognize a legitimate input signal (ie, on freq with correct PL)? then the BUSY light will extinguish and the RX will be dead.? No recognition of any on freq on PL signal into the RX input.
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If left alone, hours to days later, it recovers and once again receives and works normally.? Then it fails again in the same cadence.? Rinse and repeat...
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Having no familiarity with these machines and having only minimal data (the programming manual, user manual, and supplementary maintenance manual) I do not have enough data to go looking for the root cause of the intermittent failure.? I thought logic issues, but I would not expect a logic fault to self clear, so I'm at a loss.
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Both machines were a "give away" from local public service, so I wonder if both were exhibiting this failure and discarded from use.
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Has anyone experienced a similar issue?? Any thoughts on where to focus troubleshooting?? Furhter, soes anyone have a complete maintenance manual (not the addendum.? I already have that)?
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Thanks for the assist
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Ron
KA3JIJ
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