409.625 Several Open Carrier Analog Key Ups

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Analogrules

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Every couple of minutes, there is a key up on this frequency lasting about 10 seconds in analog mode, no PL. I know this frequency is listed as the State Dept. as a digital channel in the db, so who or what keeps keying up every 2-3 min?
 

ecps92

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Do you have another scanner running at the same time ?

a. Could be your 2nd/3rd radio causing the interference, when it stops on a channel
b. Check with a second radio for the signal, hopefully not the same make/model
c. Sometimes the TX/RX sites go flacky, we have one on VHF here in Boston that
when the external Temp drops below 30 deg it kerchunks itself in analog
d. Same with a Remote RX Site, that kerchunks but sends DPL

Every couple of minutes, there is a key up on this frequency lasting about 10 seconds in analog mode, no PL. I know this frequency is listed as the State Dept. as a digital channel in the db, so who or what keeps keying up every 2-3 min?
 

Analogrules

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No, not running two radios at once. However, I hear the key ups on both my Baofeng radio and my BCD436 digital scanner.
 

ecps92

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OK, that rules out A. which would be hetrodyning.

As to the actual issue, unless one of the Radio Techs [ :roll: ] chimes in we will never know
No, not running two radios at once. However, I hear the key ups on both my Baofeng radio and my BCD436 digital scanner.
 
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