Re: Motorola VRM-850 Digital Capable Radio – Black Friday Sale
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Here’s some tidbits I’ve learned from working with these over the years.
You can completely remove the modem control head and pop a Model 1 head on in its place. Zone/channel names won’t display correctly and the programmable buttons won’t work but it will give you a mic port and internal speaker (you have to bridge pins 1 and 2 on the 25 pin connector to enable) for testing as well as a functional power button. I have also encountered some of these in the wild that had an inactivity power off setting programmed into the modem head (which uses its own RSS) and swapping the modem head for a regular MCS head will fix this. Full and complete Model 1 800 MHz radios can usually be found on Ebay for cheaper than a Model II head by itself, and Model 1 heads don’t require dashmount mating plastic and will work as direct swaps for the modem head.
40W UHF radios also don’t like being programmed below 20W TPO and will run hot and eventually burn up if you try.
All of the VRM info is also applicable to any MCS2000 radio (they all have the VRM100 option available in CPS) so anything you can do with these you can also do with a VHF radio, R-split (403-470) UHF radio, or even 900 MHz radios.
From: main@DVSwitch.groups.io [mailto:main@DVSwitch.groups.io] On Behalf Of Steve N4IRS
Sent: Thursday, 25 November, 2021 10:29
Subject: Re: [DVSwitch] Motorola VRM-850 Digital Capable Radio – Black Friday Sale
On 11/25/21 11:22 AM, Skyler Fennell wrote: