OK, here is a question...

Around here, I seem to see only a few models of radios at any one time. Moxy
is one I've not seen and as such am not familiar. I bought a "used" Moxy for
"possible" use. It transmits ok - but no recieve audio. Now, I am
wondering - if there is a PL reed which could be blanking out the audio? OR
is it done by programming - some how?

I didn't look "too" closely to see if I could spot a "reed" - as it was late
and my eyes weren't cooperating too well. I can look again.

I am betting (hoping!) there is PL involved - but in case there isn't -
anyone have a manual I can get a copy of the receiver section schematic
from? This radio is currently on 47.50 MHz. I am not real sure I am going to
keep it. I "thought" about putting it on our fire band, but we "may" be
going VHF high - soon. Could always maybe use it too - for a 6 meter link
on the repeater! Then too, I could always sell it - it is in decent shape -
aside from the issue stated.

In article ,
(known to some as Radiosrfun) scribed...

OK, here is a question...

Around here, I seem to see only a few models of radios at any one time. Moxy
is one I've not seen and as such am not familiar. I bought a "used" Moxy for
"possible" use. It transmits ok - but no recieve audio. Now, I am
wondering - if there is a PL reed which could be blanking out the audio? OR
is it done by programming - some how?

The Moxy was an 'entry-level' version of the Maxar series. I used
to work on both years ago. They're crystal-controlled analog-only
radios, no programming or microprocessors involved at all.

Some radios either did not have an internal speaker, or required a
jumper between two of the contacts on the rear Molex-type connector to
activate the internal speaker. There should not be any PL muting going
on unless the radio has a microphone hangup box, with the appropriate
switch, wired into that same Molex plug.

I didn't look "too" closely to see if I could spot a "reed" - as it was late
and my eyes weren't cooperating too well. I can look again.

There were two different versions of PL board. One did indeed use
the standard 'Vibrasponder' type reeds, but the newer boards used a
custom IC and pluggable tone filter element. Said element consisted of a
series of precision resistors, imprinted on a ceramic substrate and
laser-trimmed to the desired value for the PL tone required.

There was still another board that provided DPL - Digital Private
Line. It also used a ceramic module, but they were much simpler in that
they're just conductive jumpers, the pattern of which determined what
code the board would generate and respond to.

The tone filter plugs can be difficult to find. If you discover
that you need to change PL tones, you would probably be better off
putting a ComSpec board in there to replace the factory PL board.

I am betting (hoping!) there is PL involved - but in case there isn't -
anyone have a manual I can get a copy of the receiver section schematic
from? This radio is currently on 47.50 MHz. I am not real sure I am going to
keep it. I "thought" about putting it on our fire band, but we "may" be

snippety

The low-band Moxys are fairly durable, if you don't put them in a
rough environment. It would make a fair 6-meter radio, but I wouldn't
want to depend on something that old for communications that could
affect public safety.

If you do decide to use it, you can get the necessary crystals from
International. However, you will need a full service manual, and the
necessary test gear, to align and test it.

Happy tweaking.


--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute
(Known to some as Bruce Lane, KC7GR)
http://www.bluefeathertech.com -- kyrrin a/t bluefeathertech d-o=t calm
"Salvadore Dali's computer has surreal ports..."