How difficult would it be to modify UHF T-band micor mobiles for use
on 430/440? Are they well suited for that purpose or would I be wasting my time to try?
73,
Phil
Modifications for UHF T-band micors for 430/440 amateur use?
Moderator: Queue Moderator
Modifications for UHF T-band micors for 430/440 amateur use?
Hi Guys,
How difficult would it be to modify UHF T-band micor mobiles for use
on 430/440? Are they well suited for that purpose or would I be wasting my time to try?
73,
Phil
How difficult would it be to modify UHF T-band micor mobiles for use
on 430/440? Are they well suited for that purpose or would I be wasting my time to try?
73,
Phil
Thanks
Hello,
Thanks for the advice. I'll just use them as doorstops then.
73,
Phil
Thanks for the advice. I'll just use them as doorstops then.
73,
Phil
The T-band Micor comes in different ranges.
406-420 Mhz, 450-470 Mhz & 470-512 Mhz.
Depending on which range you have, determines how much work you have to do to make it work.
If you have a low split radio (easly identifed by - it's removable offset transmit oscillator crystal) it should come on frequency and up to specification with only a crystal change, slight hardware modification and an alignment. ( Good for the 420-430 Mhz part of the amature band ).
Taking a mid split radio down to the 440-450Mhz portion of the Amature band is done with just a new crystal and alignment.
To make the high split radio work, you would have to replace a hand full of capacitors, new crystal and alignment.
The down side of the whole project is that they are limited to only 12 frequencies, and depending on the model, repeater use and/or simplex use.
They are big and heavy and depending on power out put level, draw a lot of current.
Also, they are getting old, so some the componets are aging and might need to be replaced.
The upside, they are bullet proof. once properly set up, they should last for darn near ever.
There are still alot of MICOR radios in the Amature service that have been converted from mobile to repeater operation.
They can be acquired at scrap prices - sometimes even free.
Good sensitivity, great selectiveity, and power out is usually better than specified from the manufacture.
After all, its one of the better Motorola radio's ever built.
406-420 Mhz, 450-470 Mhz & 470-512 Mhz.
Depending on which range you have, determines how much work you have to do to make it work.
If you have a low split radio (easly identifed by - it's removable offset transmit oscillator crystal) it should come on frequency and up to specification with only a crystal change, slight hardware modification and an alignment. ( Good for the 420-430 Mhz part of the amature band ).
Taking a mid split radio down to the 440-450Mhz portion of the Amature band is done with just a new crystal and alignment.
To make the high split radio work, you would have to replace a hand full of capacitors, new crystal and alignment.
The down side of the whole project is that they are limited to only 12 frequencies, and depending on the model, repeater use and/or simplex use.
They are big and heavy and depending on power out put level, draw a lot of current.
Also, they are getting old, so some the componets are aging and might need to be replaced.
The upside, they are bullet proof. once properly set up, they should last for darn near ever.
There are still alot of MICOR radios in the Amature service that have been converted from mobile to repeater operation.
They can be acquired at scrap prices - sometimes even free.
Good sensitivity, great selectiveity, and power out is usually better than specified from the manufacture.
After all, its one of the better Motorola radio's ever built.
Dennis