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RADIO socket
Alignment of Mic Gain
Your HF3 is supplied with pre-set gain, bass and treble to suit most vehicle
situations. However, some adjustment of the MIC GAIN control is commonly
required and don't be surprised if it takes you several attempts to get it just
right.
There is a fine line between effective microphone placement, trim-pot
setting, and background road noise transmitted. You need to find the best
balance between all three and what works for you.
With care, you should be able to achieve great results with only a minimal
increase in road noise – please note that depending on how far your
microphone is placed from your mouth and how "loud" your vehicle is, some
increased degree of background road noise is inevitable – the trick is to
make these adjustments carefully to prevent background road noise from
becoming objectionable. Adjust the gain control carefully – even half a turn
can make a lot of difference!
(viewed from in front of the HF3's RADIO connector)
1 – DC Power from radio (5-10 volts DC)
2 – Not used
3 – Not used
4 – PTT Transmit (this pin is switched to ground when transmitting
5 – Ground
6 – Mic Audio
7 – Ground
8 – Not used
7
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