[MRCA] M151A2 Commo #3

[Ray Fantini]

How you going to power all that stuff? I found that the 25A Generator that came in the stock M151 is just about useless for big installations. The more modern 60A Alternator is way better and has the added benefit of being able to charge at idle. Also I used the MX-7777 surg suppressor and mounted it in the tool box right next to the battery box. That way you can use that as a hidden power switch for the radio bus. On the old style ATU for the VRC if you pop the cover you can identify each of the four different cards for its four bands, I did that and set the tuning for best at 51.0 being that’s about all you will ever use. Watch out that you don’t louse the spring and contact stuff in the base of the bottom antenna section!

Looks great!

Ray F/KA3EKH



From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf Of MilComm Guy
Sent: Wednesday, June 5, 2024 4:09 PM
To: mrca at mailman.qth.net
Subject: [MRCA] M151A2 Commo #3


Antennas on the truck are the MX-2799 for VHF, this is the early "shoebox" matching unit, it uses the same cables as the later unit and auto tunes, unlike the MX-6707 later round unit it does not have a manual tuning knob, auto tune only.  The lower mast section on the MX-2799 is unique, it uses the AT-1096 lower mast, you can tell the difference at a glance as the hex section goes all the way to the top, the AS-1730 lower section for the MX-6707 round matching unit is machined round at the top.  The upper mast sections are the same, so if you see a lower section at a show missing the numbers you will know how to ID it.
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For the R-442 VHF receiver it uses the standard AB-15 antenna base.  For HF for the PRC-47 we have the AB-652 antenna base mounted on the Marine Corps base supplied in the mounting kit.  I think I probably have 2 more installments of the commo install, thank you for the positive comments.

Mark
K1HF
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