UHF Spectra intermittant receive

arlojanis · Post by **arlojanis** » Sun Jul 30, 2006 10:25 am

I have a mid-power UHF Spectra with intermittant receive. No pattern for when problem occurs. Caps have been changed. Vibration and input voltage do not affect. What could be causing this?

Will · Post by **Will** » Sun Jul 30, 2006 1:16 pm

Check the injection cable and connector on the RF deck.

Have you verified the accual receiver sensitivity?

arlojanis · Post by **arlojanis** » Mon Jul 31, 2006 4:43 am

Receive sens is good. The problem is receiving a local repeater.

kc7gr · Post by **kc7gr** » Mon Jul 31, 2006 7:36 am

arlojanis wrote:Receive sens is good. The problem is receiving a local repeater.

If the problem is limited to a single repeater, I would suspect that the repeater itself may be off-frequency, or perhaps modulating right out of the Spectra's passband. I've heard it happen.

Definitely check the actual injection frequency coming out of the VCO, as has already been suggested. Alternatively, check the transmit frequency. It is possible that your radio's reference oscillator is drifting or going bad (seen that happen as well).

Happy tweaking.

arlojanis · Post by **arlojanis** » Mon Jul 31, 2006 9:48 am

Other Spectras on system do not have this problem. Transmitt frequency is always OK.

jackhackett · Post by **jackhackett** » Mon Jul 31, 2006 7:18 pm

Can you confirm that it's only with the one repeater that you have the problem? Do other channels work okay?

Could be a PL decode problem, have you tried putting the radio in monitor when the problem occurs?

arlojanis · Post by **arlojanis** » Tue Aug 01, 2006 4:40 am

The radio is always in monitor mode.