[Azden] tone board wiring

[azden@mailman.qth.net]

On Wed, 16 Jan 2002 22:22:43 -0500 "Rob Crandall" <crandall@ee.net>
writes:
> Ok the tone board has the red wire coming from underneath like you 
> said but
> it is soldered to a pin to the left of where the tone board 
> goes. Should
> there be a wire going from that pin to the board + or does it not go 
> to the
> pin next to the board? 

Yes, the red wire that is soldered to the pin (the pin is not connected
to anything on the board) is the supply wire.  There should be another
red wire soldered to the same pin going to the tone module.


Another stupid question,

Questions are not stupid unless they are not asked!  You can't learn by
sitting there.


Is there a way 
> that I
> can check to see its working? 

Yes, maybe


Will I hear a tone when I press the 
> mic or
> will some on another radio I'm transmitting to?

No, you will not hear a tone on the set on which you are transmitting,
and you probably will not hear it on a receiving set either.  The highest
tone is about 200 Hz and the lowest one is around 70 Hz.  Most receivers
have their audio frequency response set up to eliminate the frequencies
below 300 Hz just so that you are not bothered by them.  The typical
modulation (deviation) for an FM transmitter of this type is between 4500
and 5000 Hz.  The tone deviation is only 700 Hz.  What this means is that
the audio is 6 to 7 time louder than the tone.  It's very hard to hear
the tone.  The easiest way to check to see if the tone is present is to
look at the output (white wire) with a test instrument.  A scope is best,
but an AC voltmeter will do.  Alternately, you can transmit to a repeater
that requires tone to operate and see if it trips.

Ed
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