Most Motorola radios that had the control head seperate from the rest
of the radio used ignition sense. On the older radios it was plugged into
the rear of the control head. Its been several years since I was a radio
tech but as I recall pin #19 on the back of the head was +12 VDC for the RX
circuits and pin #20 was +12VDC lts for the low power TX circuits. The
heavy red wire supplies the PA. If memory serves, it was the same on most
of the older ones, Micor, Mitrek, Motrac, etc.
Hope that helps,
Wade - KR7K
----- Original Message -----
From: "Anthony L .Ferguson" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, January 08, 2005 11:56 AM
Subject: [Repeater-Builder] Help!
>
>
> Hello Folks,
>
> I know it has been a while since I've posted any news of my simplex
> repeater project. I have obtained 6 Motorola Mitrek transceivers with
> the control cable and control head. I have plenty of channel elements
> and having them recrystaled will not be an issue either. Bomar or
> International Crystal will be my choices.
>
> Now, I need help with something and I'm sure someone knows how to
> solve my problem, so here is the issue. I tried to test the Mitreks
> radios to see if they worked . I had the cable pins correctly placed
> in the control head, each pin were numbered so I don't think I
> screwed that up. I had the positive and negative wires hooked to the
> power supply with plenty of voltage at 13.8volt DC.
>
> I had the radio hooked to a dummy load in case of the radio
> transmitted, Power was getting to the radio by checking the internal
> power leads from the control cable. I pressed the PTT on the
> microphone and nothing happend. I did noticed that no power was
> getting to the control head, so I looked for a fuse nothing inside
> blown. I thought that the microphone might be messed up so I don't
> know it might be ?
>
> Then a friend mentioned that I would have to fool the radio or bypass
> something to make the radio appear to get 12 volts DC from the
> ignition. He mentioned about heating some pins and doing something
> like that on the inside to get the radio to tansmit. Anyone have any
> Idea what I need to do??
>
> Now for the other news, I have plans for the purchase of a full
> duplex repeater on 440 Mhz , so don't think I am getting cold feet HI
> HI.
>
> I'm slow working on this project but at least I'm not stopping with
> my plans. I should also say, I'm no the only one helping me either,
> there are a few others helping , so I don't want to take all the
> credit for this I'm not a glory hound.
>
> So, if anyone has any information please let me know.
> Thanks DE KB4ZGO
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
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