Z-Series Audio Optimization Guide
Z-Series Audio Optimization Guide
Page 10 of 10
Interoperability Now
✓
Solution: First –
and this is important
– it is extremely wise to make sure the Receive
Audio Levels are set properly. Only after doing so, increase
Transmit (Output) Level
of
transmitting Radio Channel until donor radio is properly modulated.
4.5
Symptoms: Audio Sounds too Loud or Distorted
▪
Cause: Receive audio level from donor radio (or other device) is too high.
✓
Solution: Change
Receive (Input) Level
audio setting of the receiving channel until the
corresponding Signal LED (or the first red LED on the level indicator of the RSP-Z2)
flickers with voice peaks of incoming speech; not on at all times when speech is received.
✓
Note:
The number in the Z-Series device GUI indicates the actual level of audio being
received. If the incoming level is -12dBm, the
Receive (Input) Level
setting of the Radio
Channel should be set to -12dBm. If the channel is not receiving enough audio, the
number in the GUI must be set to a lower number to correspond to the actual input level.
The Z-Series device will then apply additional gain or attenuation per the setting change.
▪
Cause: Transmit audio level delivered to donor radio too high.
✓
Solution: First –
and this is important
– it is extremely wise to make sure the Receive
Audio Levels are set properly. Only after doing so, lower the
Transmit (Output) Level
of
transmitting Radio Channel until donor radio is properly modulated.
4.6
Symptoms: False Keying of Donor Radio by Radio Channel
▪
Cause: Extraneous RFI emissions present at frequency/level that keys a donor radio.
✓
Solution: Eliminate RFI emission source.
✓
Solution: Transmit power of other, nearby donor radios may be higher than your system
needs. If there is a power setting, reduce to no more than necessary to link to repeater.
✓
Solution: Modify antenna placement.
✓
Solution: Change
COR Detection Type
to VMR.
4.7
Symptoms: Cross-Connected Radios Continuously Key Each Other
▪
Cause: This phenomenon, known as “Ping-Pong”, is caused by the tendency of some
radios to temporarily unsquelch at the end of a transmit sequence. This momentary Active
COR condition in a donor radio (Radio 1) will cause a momentary transmit sequence in
devices cross-connected to that donor radio. If one of the cross-connected devices is
another donor radio (Radio 2) with the same momentary unsquelch at the end of a transmit
sequence, then the Radio 1 momentary unsquelch will key Radio 2, whose resulting
momentary unsquelch keys Radio 1 in a continuing sequence.
✓
Solution: Use the
COR Inhibit
(after PTT) time function to make the Z-series radio
channel ignore an incoming Active COR signal for a short time after the channel ends a
PTT session. Watch the COR LED on the Z-Series device and increase the COR Inhibit
time until the COR LED no longer flashes at the cessation of PTT.
✓
Solution: Change
COR Detection Type
to VMR
