cause distortion, howling or echoing during transmit.
Your transmitter is designed to operate at full power up to an VSWR of 4.0 – above this the
transmitter will start reducing power to protect itself. The maximum power reduction is 50%. If
your V16 is set to 5W TX power then no power reduction takes place as the transmitter will
survive even a very bad mismatch.
Reasons for a bad VSWR:
a) Incorrect antenna cable (such as 75 ohm cable instead of 50 ohm).
b) Non-existent or incorrectly dimensioned antenna ground plane (for typical monopole
antennas).
c) Faulty cable wiring to connectors (open or short circuit).
e) Unsuitable antenna type, bad mounting location with nearby metal interference or antenna
not designed for VHF frequencies.
f) Faulty antenna (this should be quite rare, just mentioned for completeness).
Tuning antennas
This is typically done by adjusting the length. Shortening the antenna moves the tune to a
higher frequency. If you tune this way – tune in very short segments (0.5cm or less) and
observe the result.
Adjusting microphone levels
The setup menu provides a wide range adjustment for each microphone input level. This
allows headsets of different manufacture and microphone sensitivity to be used. It is very
important to adjust these levels correctly so that all audio levels in the system are balanced.
This is also a precondition for the VOX noise gating to work. A microphone level that is too
high will make it impossible to find a workable VOX setting even when it is turned to its
maximum. On the other hand a setting that is too low will require a high voice level to open
the VOX even if it is at a very low setting.
Since intercom and RX volumes are independently adjustable, the RX volume cannot be used
as a reference to adjust your microphone volume.
There is a small trick that can prove very easy to use to adjust the microphone level:
Tune your radio to an unused frequency or a chat frequency where you can make a short test
transmission. Make sure the TX sidetone is switched on so you can hear yourself in the
headset when you talk normally into the microphone. Adjust the intercom volume so you have
the sidetone at a pleasant level (Sidetone is you own voice in the headset).
Now speak a short test sentence: “1 2 3 Testing” will do nicely. Note how load your own voice
sounds in the headset. Now press PTT and repeat the same phrase at the same voice level.
Does the sidetone sound loader or softer ? If it is softer – your microphone level is too high,
adjust it down and increase the intercom volume to compensate, If loader, do the opposite,
increase your microphone gain.
When you have achieved the same level of sidetone regardless if transmitting or not then
your microphone level is correct and you will find your VOX can be adjusted typically
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