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IC-FR4000 - No Audio

N

N0JKY

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Oct 12, 2021
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10
Hello,

Strange issue with this IC-FR4000-3 Repeater. Firmware 1.5

After programming a simple repeater RX/TX Pair, I'm not getting any audio returned when accessing the repeater, just a carrier, and a brief Squelch Tail. (Using 2 HT's for testing)
Searching this Forum, I did find a thread to check PCB CP1 and CP2 circuits for cuts due to UT-109/UT100 Installed Options.

Both CP1 and CP2 appear untouched.

Have anyone run across this and/or have any suggestions on what else to check?

Thank you in advance.

Dan
 
jeepsandradios

jeepsandradios

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So a bit more info is needed. Does unit have duplexer installed and tuned ? Antenna's on repeater or dummy load. Does it have a hand mic to test with ? I have seen desence do exactly what you describe.
 
N

N0JKY

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Oct 12, 2021
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I do have a duplexer that was sent out for tuning on the operating frequencies, an Icom IAS RDN 450B. Vendor indicated a perfect tune, no issues, but again this was done via, USPS. Not ideal I guess.
I tried the Duplexer externally, and I also tried using 2 external roof mounted antennas, approximately 12 feet apart.
Same results, carrier, but no audio. I do have a hand mic I can try, and also a dummy load.

Power output into a Dummy load indicates 25W, and is adjustable via., A06 Power in adjustment mode. No other adjustments were made.

How do I verify if it is indeed desence?

Thank you for the quick reply.
 
N

N0JKY

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So I replaced the Duplexer and it appears the repeater is working fine now. Bad Vendor tune I guess.
The repeater Audio Output seems really low, both on the repeater speaker and the audio received on the HT used for testing.
I'm not sure if that can be adjusted or not. Squelch tail needs some work too, but at least I'm moving forward. :)

Many thanks to those that replied.
 
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