Author Topic: Noise on transmit  (Read 417 times)


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Noise on transmit
« on: 2018-02-19, 14:40:45 »
We are experiencing noise on transmissions when nothing is being said.  In other words, while transmitting and you stop talking the background noise gets louder.  When a word is spoken the noise floor immediately goes back to normal until you stop talking again.  It reminds me of AVC or AGC where a circuit is adjusting the level of audio.

The configuration is two 1258 units purchased several years ago as a pair, serial # 4262 and 4032 .  The following info is the same in both original units:
PID   4
Version   5
HW   6
Software   2.91
Bootloader   1.9
Compiler   4.6.2
Build   Jun 16 2016 07:13:13

A standard non-amplified microphone is used.

When I use my newer 1258 control head the problem does not happen.  Serial # 9964.  The difference between my control head and the older one is that mine is Version 7, HW 8.
PID   4
Version   7
HW   8
Software   2.91
Bootloader   1.10
Compiler   4.6.2
Build   Jun 16 2016 07:13:13

Do you have any idea why this is happening? As I recall, it happened in previous software builds.

73, Joe K1ike