Motorola, then select Micor.
Or here's a shortcut:
<http://www.repeater-builder.com/rbtip/micor-index.html>
When I converted my first Micor station (a UHF one) I went through
everything you are, and didn't have the web as a resource. I spent
several weeks of evenings and took lots of notes as I went. Today the
repeater-builder Micor page has a consolidated collection of info,
from folks all over the country that have donated their experiences.
The conversion from Joel Huntley WA1ZYX is closest to the
way my first station ended up, and I'd suggest you start reading
there. One difference I did was that I didn't use the jumper
between J2-6 to J2-14 the way he did. One point is receive
audio, the other is the audio amplifier input. I put a rotary switch
in the small panel that holds the volume and squelch controls,
and wired it in place of the jumper: one position is the receiver
audio, another is transmitter audio, and the third monitors the
autopatch line through a transformer and a capacitor.
My last station I used the method of connecting via the
squelch gate card slot, only I left the actual squelch gate
card alone (a common mod is to add a multipole center-off
toggle switch and a DB9 connector to the faceplate)....
I took a timeout timer card and stripped it, and added some
more pins to the edge connector (actually I took another dead
card and scavenged the pins from it).
I then mounted a DB15 female connector, a fuseholder and a
few LEDs to the metal end of the timeout timer card, plus a
few audio coupling capacitors and a couple of level translation
transistors on a piece of perfboard mounted to the card itself.
Unfortunately I didn't take any pictures.
A cable from that DB15 connects to the repeater controller.
The common name within our group for that modified card is
the interconnect card.
Normally the system runs on the external controller, through
the interconnect card, but if I need to do some work on it I can
power down the system, unplug the interconnect card and
plug in the squelch gate card, which normally lives in a
antistatic bag in the old Craftsman toolbox in the bottom
of the rack.
Mike WA6ILQ
At 05:22 AM 11/15/05, you wrote:
Thanks for the info, I'll look for that .doc file, it's always good to
add to the Micor library.
I cut one end of the diode loose on the interconnect board and guess
what? The COR is now working and TOT card is normal and the Squelch
Gate card now has control of the squelch. I still think this one will
have an excectional receiver since I have yet to fine tune it and I
can break squelch under .2 microvolt.
Next problem (which I have not started troubleshooting) appears to be
the fact it's not passing audio. I can hear audio on a local speaker I
connected up (receiver 2 does have the 15watt amp). No audio at all is
passing, not even low and muted.
I also crystaled up transmit last night and I appear to have decent
enough drive out of the exiter but nothing from the PA at all. This
was a working machine when the control wires were cut. It was at a
national airport that was being shut down and was used as a remote
base five stories down in the control tower.
Any suggested starting points for the lack of audio and PA issues?
I appreciate your help...Don N5MZQ
--- In [email protected], "Kevin King" <[EMAIL PROTECTED]> wrote:
>
> Do a search for this document "C71RCB-2.DOC" it is for the
conversion of a 6
> meter base. but it does have good note for working with the control
> functions of the station.
>
> Try repeater-builder and google. If you can not locate it give me
your email
> and I will forward it to you.
>
> Kevin King SCSA BSCIS
> ARS KC6OVD
> GMRS KAG0378
> EIEIO 2722
> Acworth Georgia
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of donlspivey
> Sent: Monday, November 14, 2005 9:01 AM
> To: [email protected]
> Subject: [Repeater-Builder] Micor Base To Repeater Conversion Problems..
>
>
> 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
>
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