Micor receivers are excellent for repeater use. They
are very selective as the front-end only allows a
frequency range of perhaps +/- 1 or 2 MHz between
channels. Rated sensitivity is 0.5uV for 20dB
quieting. The Motorola 6dB preamp reduces that to
0.25uV, and it really hears that well.
I believe you will need to make some mods to the card
cage, as that's where the repeat functions would
exist. The bare receiver and transmitter just make a
base station. Also, you might need to play with
getting your own COR signal out of the squelch card on
the receiver chassis, however one might already be
there. Obviously a manual set would be helpful. The
one I have for UHF repeaters consists of two manuals:
one for the TX, RX, and PS, and the other for the
remote control and repeater cards.
Bob M.
======
--- donlspivey <[EMAIL PROTECTED]> wrote:
> Although I haven't spent a huge amount of time on
> what should be a
> simple conversion, I would like to get the opinion
> of a Micor guhru or
> two.
>
> I'm converting a Micor base to repeater duty. It was
> originally a dual
> receiver single transmitter intermittant duty
> machine on 149mhz (yup,
> both receivers on 149.xxx). I'll deal with the
> limited heat sink on
> xmit and shielding by greatly reduced power and fans
> if needed. It
> will be carrier squelch for now, it does not have
> factory PL. I will
> probably modify for a external controller but much
> later.
>
> The receiver blew my mind. I haven't even tuned it
> by the book yet and
> I can see it is super sensitive. I hope selectivity
> will be there too.
>
> My problem is getting it to repeat. I made (I
> assume) all necessary
> jumpter changes on the modules as well as cage and
> receiver
> interconnect boards. I can go into xmit manually
> proving the ptt line
> works. Otherwise, no repeat. I did have one small
> problem that
> actually may have helped see the whole picture. I
> lost a diode
> (shorted CR16) on the squelch gate card that send
> the machine into
> continuous xmit. I killed the pa but left the
> exciter up to get a
> better look at it. While held in xmit, I noticed
> that I could set the
> squelch on the SG board like it should be and
> although not quite
> right, the timeout timer was working. It actually
> backwards. It times
> out with squelch closed but doesn't when open.
> Probably due to the
> state of that ptt line.
>
> Anyway. Any ideas as to where to concentrate on to
> get a better idea
> why I can't get it to repeat. Remember; I could set
> the squelch
> threshhold on the SG module when that diode held
> transmit on.
> Otherwise it does nothing. I know I'll slap myself
> when I find it, but
> maybe one of you guys have already "been there and
> done that". Thanks
> for your help...Don...N5MZQ
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
> [EMAIL PROTECTED]
>
>
>
>
>
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