Check all the things that are common to both the transmit and receive
function. If front panel indications all seem normal, VFO readout etc. you
can probably rule out power supply, or power distribution inside the rig
(but not for certain) or the VFO PLL system.
I'd check all of the bandpass filtering and cables that are in between the
antenna port and the receiver front end. Maybe connect signal source
(antenna) bypassing those filters and see if the receiver perks up.
How to attack this problem is highly dependent on the tools you have
available. At the very least a general coverage receiver with some sort of
sniffer loop or probe would be helpful for listening for various
oscillators in the radio. A spectrum analyzer would be nicer. Do you have a
signal generator? If so you can test whether you can input a signal to the
IF stages and hear it.
Find out what does work and keep checking until you find what doesn't. Can
you couple a 9 MHz signal into the receiver product detector and hear it?
Can you couple a 6.3 MHz signal into the 6.3 MHz IF stages and hear that?
Can you couple a 9 MHz signal into the first IF stages and hear that? Can
you hear the BFO with your general coverage receiver using a pickup loop
near the BFO? Can your general coverage
Cleaning contacts is a really good idea and likely to fix the problem.
DE N6KB
On Tue, Sep 29, 2020 at 2:20 PM Bob McGraw K4TAX <rmcgraw@blomand.net>
wrote:
> Jim:
>
> How long has it been since the connectors internally were cleaned?
> Likely never. So it is time to unplug each one, scrub the male pins
> with a Q-Tip with contact cleaner applied and plug it back in. Do NOT
> spray anything into the radio.
>
> 73
>
> Bob, K4TAX
>
> On 9/29/2020 6:37 PM, jbrannig via TenTec wrote:
> > My OMNI died suddenly.No signals on receive and no RF out on
> transmitEverything else functions as normal..ie. frequency read out, audio
> noise, bandchange...Any ideas on where to start looking?Tnx es 73JimSent
> from my Galaxy Tab® A
> > null
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