Getting To Know The Motorola Micom

 'Getting to know you, getting to know all about you'

Fans of Rogers and Hammerstein's 'The King and I' will remember the song. I first heard it when the impossibly beautiful Deborah Kerr sang it to the King of Siam's kids in the movie version of the musical. OK, Ms. Kerr couldn't sing, or couldn't sing good enough, so the undisputed queen of 1950's & 60's female musical over-dubs, Marni Nixon, turned Ms. Kerr into a musical star. I've been smitten with Deborah Kerr (and Marni Nixon) ever since.

Nothing to do with ham radio, but with a look like that, who cares?

'Getting To Know You' is a tune I often sing to any new radios or accessories that come across my bench, particularly if the device falls outside of what I describe as normal ham radio operational protocols. That would be just about anything not made by Icom, Kenwood or Yaesu. And so it was with a radio I'd had an interest in for years, but didn't know where to start when looking for one - a Motorola Micom commercial HF transceiver. These were (and still are) in common use in the MARS, CAP and SHARES communities, and unlike their L3/Harris, Barrett or Codan brethren, they were relatively affordable on the used market. Motorola stopped manufacturing the Micom line about 8 years ago, but there's still an active user community, swapping advice, radios and components. Good working examples pop up regularly on eBay. So, in terms of availability and price, they are pretty accessible and have a very good reputation for ruggedness and long service life.

I found mine, a 2E model. on a Groups.io site devoted to commercial and military HF rigs. According to the seller it was in excellent condition and had been used in a test environment at a small radio accessory development company he used to own. The radio came with an external long wire tuner (similar to an Icom AH-4), microphone, power cable, programming software and some documentation. On arrival it was clear that the rig really was in very good condition. The microphone was the only real iffy item - it had been in a lot of hands, and it was a bit 'sticky'. The seller dug a new one out of his box of parts and sent it to me for free.

The biggest issue was a programming cable. Motorola did a lousy job of documenting just how to connect this thing to a computer to get it set up. All the instructions say is, 'connect programming cable'. What programming cable? What does it look like? Where do I connect it? There's a 25 pin accessory connector on the back of the rig and, like the rest of the radio world would, I figured that served as the radio programming port. But no. I found out through the user community that programming takes place through the CAT6 microphone connector. What this means is, there's no CAT-like radio control that lets you do voice ops while managing frequency or settings. There are no original Motorola programming cables to be had, at least none I've been able to locate. There is a guy on eBay selling what he claims is a home made programming cable, but what he sells doesn't work. I was saved by an instruction sheet issued by the Civil Air Patrol back in the early 2000's that showed how make a programming cable using CAT6 cable to a DB9 serial connector. 

The Motorola software is old, but pretty good. It allows you to set up the channel frequency memories and settings, and configure the radio for ALE. It was written to run on Windows 2000 or Windows 7, and has a distinctive 32 bit Windows XP look and feel, but runs just fine on Windows 11 in compatibility mode. Earlier this year I got the radio programmed with a swath of Georgia ARES, SHARES and other public service frequencies, played around with it a bit, then got distracted by other rigs. The Micom sat unused for months. 

A few weeks ago I came upon a Micom video on the LifeIsTooShortForQRP YouTube channel. The host reviewed a Micom 2E - the same model as mine, except his is the remote head version. Other than that, it's the same radio. He reviews and repairs a LOT of commercial and military HF gear, and had nothing but praise for the Micom. The video renewed my interest in the Micom, and I decided to get it back on the air and spend more time learning its capabilities. 

I now see why the Micoms were (and still are) so popular. They are a mil-spec chunk of metal that just works. I have mine connected to an LDG Z-100 tuner so I can use to my MyAntennas end-fed in the back yard. The speaker audio is excellent - designed to 'punch through' in noisy environments, and I get consistently great audio reports whether I'm using the hand mic, or the Motorola handset I found on eBay. 

I've only used it on sideband for local, state and regional nets. It MAY do digital, but I'll need to work on figuring that out. As far as I can tell Motorola never produced a digital modem. Discussion on the topic is very... unclear. One recommendation is a digital mode interface made by XGGComms out of New Jersey, built with a 25 pin connector specific to the Micom. Reportedly it will also allow the 25 pin port to serve as the programming and radio control connection. One's on order, but it'll be weeks before I'm able to give it a comprehensive test.

The Micom has ALE built into the firmware ALE 2G, and apparently does it well, so that'll be the next thing I get it set up for. 

Overall, I'm finding the Micom an interesting example of a commercial HF rig, and it's helped me better understand what the commercial HF hardware world looks like. Customers aren't interested in spinning dials and waterfalls. They want a radio that's easy to operate, holds a few channels, has a long mean-time between failure, and when one of their personnel keys the mic, it works with no fuss or muss. They are business tools, not hobbyist toys.

I'm sure I'll be writing more about the Micom, as I get deeper into digital modes and ALE. So stay tuned. 

W8BYH out