DES with Saber - little problem...
Posted: Sun Mar 25, 2012 8:18 am
Hi,
I am using two Motorola Saber III radios with DES, and they show the effect that the receiving radio does not sync when the transmitting radio starts in secure mode with immediate very loud noise, like background noise from wind or from an engine. It can be provoked when you blow into the mic and press the PTT. Sync only occurs when the noise stops. Then the sync is kept, even when the same nois is applied again it is just transmitted as it should.
The radios work in 20 KHz bandwidth mode / 4 KHz deviation, alignment is just perfect ( I checked it), deviation in clear and secure is just right, and the eye diagram of the 12kbps FSK looks good and is as expected. The DES hybrids are NTN4714 and NTN5835, the radios are German Public Safety version (MX3013 / Z42QXK7139AN). XL is deactivated due to worse audio quality.
Is this effect known?
I am using two Motorola Saber III radios with DES, and they show the effect that the receiving radio does not sync when the transmitting radio starts in secure mode with immediate very loud noise, like background noise from wind or from an engine. It can be provoked when you blow into the mic and press the PTT. Sync only occurs when the noise stops. Then the sync is kept, even when the same nois is applied again it is just transmitted as it should.
The radios work in 20 KHz bandwidth mode / 4 KHz deviation, alignment is just perfect ( I checked it), deviation in clear and secure is just right, and the eye diagram of the 12kbps FSK looks good and is as expected. The DES hybrids are NTN4714 and NTN5835, the radios are German Public Safety version (MX3013 / Z42QXK7139AN). XL is deactivated due to worse audio quality.
Is this effect known?