SP50 UHF frequency problem
Moderator: Queue Moderator
SP50 UHF frequency problem
I have a UHF SP50 that appears to not transmitt or receive. But it does transmitt in the wrong place. When I PTT the red light flickers several times and then stays on. Transmitt frequency runs all over the place. Sometimes it is 6.99 mHz high in frequency and moves around. What's the problem?
"The world runs on radio."
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Lake Effect
- Posts: 311
- Joined: Tue Dec 06, 2005 9:47 am
I am thinking the very same thing....A defective reference oscillator.
As long as there is an active signal being seen by the micro, the radio will attempt to lock onto whatever frequency the reference oscillator is 'tuning' to, which is 'wandering', and this will cause the radio to wander as well, every time the oscillator 'self-warps' the radio will continue to lock to the new frequency, and since this changes with voltage and time, the radio's actual operating frequency will also change or warp as well, until the reference oscillator finally dies and the radio stops operating.
As long as there is an active signal being seen by the micro, the radio will attempt to lock onto whatever frequency the reference oscillator is 'tuning' to, which is 'wandering', and this will cause the radio to wander as well, every time the oscillator 'self-warps' the radio will continue to lock to the new frequency, and since this changes with voltage and time, the radio's actual operating frequency will also change or warp as well, until the reference oscillator finally dies and the radio stops operating.
16.8 mHz oscillator is stable. I noticed when transmitter does lock on frequency, the mic mod is high and the PL mod is low. I have found that it will transmitt on frequency when supply voltage is lowered to 5.5 volts, but no receive. Mod is normal. After transmitt there are three beeps in speaker when using any supply voltage.
"The world runs on radio."