Portable repeater help

Discussion in 'Mobile Radio Systems' started by K6ELV, Mar 30, 2011.

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  1. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    Old Micors can be found almost for free. They made a zillion model numbers with various digits defining the frequency range, power, DC or AC operation, mobile or fixed/repeater operation, etc. But starting out with a regular mobile Micor (they're fairly heavy and might be quite old, but they're incredibly rugged and easy to work on -- and spare parts are very available) the conversion to repeater service is pretty easy. They're well shielded enough that not much more has to be done to keep the transmitter from desensing the receiver (other than using well decoupled power and control lines, well shielded cables and a duplexer) and many models can run 100W output 24 hours a day.

    Some stuff on that here: http://www.repeater-builder.com/micor/micorvhfmobile.html
     
  2. K7JEM

    K7JEM Ham Member QRZ Page

    I would agree about the Micor as far as a good working, low cost conversion. Although the mobile Micor had a model with 110 watt output, it could only do that on an intermittant basis. The Micor mobile heatsink allows operation to 35 watts continuous, but even at that it gets quite warm.

    When we were doing the conversions, we would get the 45 watt mobile micors and set them to 25-30 watts or so, and they ran quite well.

    I have thrown away several of these in the past few months, as they are virtually worthless (money wise), but still pretty good radios.

    Back on topic, for a portable repeater UHF is the way to go, and small 1-5 watt link radios as the RF part. Using that, you can build a complete repeater that weighs under 10 pounds, and is about the size of a metro area Yellow Pages. It will run off a small 7AH gel cell, or even a wall wart. 1 watt is surprisingly effective for a portable repeater deployed in a well thought out location.

    Joe
     
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