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1-8 of 8 messages
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Motorola Micor
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by KE4JSJ on December 13, 2004
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Hello,
Could anyone tell me if a Motorola Micor Model #T44RTA3803BA can be modified for 6 meters? This seems to be a 403-512 mhz radio. Numbers on Control head are: TCN1124A_1
Thanks,
Doug KE4JSJ
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RE: Motorola Micor
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by N3ZKP on December 13, 2004
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No, it can't.
I don't mean to be condecending, but a look at what you posted should tell you that. The frequency range the radio is designed for doesn't come close to matching what you need for 6m.
Lon
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RE: Motorola Micor
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by W7DJM on December 13, 2004
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Have you been to "batlabs.com" ? This is pretty much THE info place for Motorolas, and somewhere on their site, is a model chart to decode them.
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RE: Motorola Micor
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by KE4JSJ on December 13, 2004
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Thanks all for the information. I had a feeling it couldn't be done. Thanks again.
Doug Pugh KE4JSJ
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RE: Motorola Micor
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by N9PCS on December 14, 2004
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The Micor you mention can be modified for 70cm. In fact it is one of the more popular radios used in repeater service.
That's the good news. Now the bad news. It may not be worth the hassle and expense.
www.batlabs.com has already been mentioned, there is lots of good info there, another excellent site is www.repeater-builder.com. That site is geared towards repeaters, but there is also a lot of good general information there on radios and converting them to ham bands.
The Micor was crystal controlled. New crystals are available, but expect to pay $30-$60 each for them. and you need at least two (one for TX plus one for RX).
You will also need access to some test equipment to get these working on the ham frequency. If you want a list of what is needed, do a search for "Mitrek" in the Elmers forum. I was interested in converting a Motorola Mitrek to ham use and asked there what test equipment is needed. I received several good responses, and have been slowly collecting some of the suggested items.
FYI The Mitrek is also a crystal controlled Motorola mobile, similar but slightly newer than the Micor. Actually in some circles, despite the fact it is older, the Micor is more highly regarded. That is primarily due to its carrier squelch circuit.
Hope some of this helps.
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RE: Motorola Micor
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by K5LXP on December 14, 2004
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N9PCS is pretty much right on the money in all but one respect, 450 Micors only need one crystal, the receive frequency. There are two different versions of 450 Micors. One has a 5MHz offset built in, meaning you only need one crystal per channel as long as you only need to work repeaters, the other is the 'talkaround' or simplex option version which puts a 2nd filter in the transmitter to accommodate transmitting on the receive frequency. If you want to run anything besides 5MHz split, you need the 'talkaround' version of the 450 Micor.
I've never needed any specialized equipment to work on any Micor, base or mobile. The metering panel is convenient but it doesn't do anything a regular VOM can't do. Most of the time you're just tuning for max smoke anyway.
The squelch on the Micor has a dual-hysterisis feature that keeps the squelch open longer on weak signals but cuts it off quicker on strong ones. It uses true high frequency noise detection, unlike many squelches now that are little more than limiter comparators. A unique feature of the VHF Micor mobile is its' use of a serrasoid modulator, which I've never seen anywhere else but in a textbook.
Lastly, as many Micors as I've owned, worked on, and still have, for most ham purposes they're not worth the effort or expense anymore. Mitreks are much smaller, lighter and for all practical purposes, work equally as well. Even those are getting harder to find now, there haven't been a lot of crystal radios made in quite a while. Whatever platform you decide to go with, make sure you get spares for parts, there's no telling when the next chance will be you can find another one if you need it. The PA transistors used in all flavors of Micors have been obsolete for years, so having spares is about the only way to repair them.
Mark K5LXP
Albuquerque, NM
(former Moto tech)
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RE: Motorola Micor
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by KE4JSJ on December 14, 2004
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Thanks to all of you for the advice. Sounds like I better quit before I get in too deep.
Thanks again,
Doug Pugh KE4JSJ
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