NOTES ON VOX OPERATION :
Vox sounds a great way to go! Just talk and the radios goes to transmit,
stop talking and the radio goes back to receive. Sounds
cool......... until you try it on a motorcycle! The problem
is the concept has constraints that are at loggerheads, when used
in the Motorcycling situation. For a good fast attack vox ( like the Uniden
range of radios have, ) you need a good sensitive microphone to catch
the first speech syllable and trigger the transmitter to switch
on. HOWEVER on a motorcycle we do not want a sensitive microphone or we
will be picking up every noise around the bike ie engine noise and wind noise
! There in lies the problem juggling vox sensitivity against microphone
sensitivity . It can be a real trap , dont go there , stick to PTT
on the handlebar !
Some of these radio/headset systems ( eg digitalker , digitor ,Uniden 041,
042,043.044,047 ,060 systems) can also be run with vox,( not using
PTT) To enable this, you must short out the PTT via an off
on switch accross the PTT wires or optional shorting plug to replace the
PTT button, however PHS Ltd no way guarantees that it
will be as successful in operation as the "Manual PTT system" , VOX
operation ( with no PTT involvement) is at your own "risk" ( but it can be done quite successfully
,if you
are somewhat technical , understand and accept the constraints)
Because our microphones are somewhat less sensitive you will have
to talk more loudly to trigger the VOX circuitry in the radio
experiment with voice "loudness" to get it right. I've run
Vox on my Norton 850 Commando successfully and no one detected I was using Vox with a Uniden
042! , I can give you advice
on it, but as above, I make no guarantees
NOTE:
Some radios however MUST be run
in VOX mode but controlled by pressing the PTT eg uniden '041P ,TE1172WT ,D1793
this is
not the most satisfactory way BUT THE ONLY WAY you can use them with a
motorcycle headset , the Uniden 041P has a fast attack vox so it performs
quite well however the "on special $98 a pair" DSE transceiver
D1793, and
warehouse TE1172WT Vox , has a
slow response of up to 0.5 sec before it goes to transmit ..(a crap response
).. but you do get
used to it. you get what you pay for.!
You can wire the
external PTT across the internal PTT micro-switch and then put an extra
earphone socket in the radio!
We did sell modified D1793 transceivers with an extra 3.5mm PTT socket in the back (
wired across the internal PTT micro-switch ) now they are a more
usable device !! see the Specials page
if you have some of these radios Im happy to tell you how to
modify the radio to enable this
Want to go back to Motorcycle communications? ...... click here!
Pinfold Health Services Ltd,1172 Arawa St, Rotorua 3201,New Zealand. ph +64-7-3488850 fax +64-7-3486555 pinfold@xtra.co.nz