PRC-320 HF manpack: Logbooking

Amateur Radio operators keep logbooks of the stations they’ve contacted for a few reasons. A) They’re handy if you have to prove you aren’t creating interference with neighbors, a business or government (it happens); B) they’re important for filling out a reply QSO card, and critical for contesting, or uploading your POTA/SOTA OPs; and C) They’re a personal memorialization of your day at the beach, that great time at Field Day, the Net you joined, and the thing you wave at your family to prove “See! I told you I worked Capetown!”

My logbook is definitely the latter.

Jarret Green KB0ICT wrote HAMRS for all of us. It’s one of several computer logbooks I like. It’s cross-platform, works on Mobile, beautifully designed and free. Donations are encouraged.

https://hamrs.app

the most important prc-320 manpack accessory

During its service life, the RT/UK PRC-320 Manpack HF Transceiver deployed wherever the British Army was sent. That likely ran from frozen wilderness to scorching desert. So the radio was built to handle extremes (as well as live underwater for a time; but that’s another video) with stable operating ranges from -37ºC to +52ºC. This video short pays homage to the upper range.

Another in my occasional series of adventures with my old, heavy and extremely capable military radio.

PRC-320 HF MANPACK: BEACH OPS

Welcome to an occasional series of adventures with my old, heavy and extremely capable military radio: the RT/UK PRC-320 “Clansman” Manpack HF Transceiver, built for the British Army, and dating from sometime in the early 80’s.

This time, a visit—in warmer weather—to a nearby beach to test propagation and a new antenna, the Chameleon MPAS 2.0

The antenna is a complete system for deploying manpack verticals, wireline dipoles, inverted V and L shapes, and more. It’s super-configurable. What I love is the ability to mount the whip and whip extension together for an 18’ 2” vertical, which is then screwed into the Hybrid-Micro Matching Unit, and connected to a ground spike. The unit contains counterpoise and feed-line inputs, and the whole thing stands up in just a couple of minutes. No fuss outside of screwing the elements in place, and finding some earth that yields to the spike.

Kudos to Chameleon for the Ranger Green paint, lending notes of badassery to the proceedings. The system feels like a long-lost cousin with my Clansman.

2023: A year's worth of milspec

After a hiatus, THE HAMATEUR project refocused on documenting Amateur Radio enthusiasts around the country. I’m hoping to cover more Northeast gatherings this year, and have Dayton Hamfest penciled in for May 2024.

But I started off the year—literally—in my own backyard, with one of my favorite transceivers: the British Army PRC-320 HF Manpack radio.

Some background: The PRC-320 was part of a system of man-portable HF/SSB radios spec’ed for British Army combat anywhere in the world. It was used by long-range patrols and Special Forces and was renowned for its durability and flexibility.

The full deployment includes the transceiver, battery pack, headset + PTT and/or handset, morse key, solar shield, 4-element counterpoise, dipole and long-wire antennas, a 2.4m whip antenna, and a pack frame into which the radio is bolted for the operator to carry. It’s all stuffed into a large Bergen-type bag. The whole shebang is about 21 Kgs.

The radio works in CW(wide or narrow)/AM/SSB(USB; LSB optional) from 2 MHz to 30 MHz in up to 100 Hz increments through decade-switches, for a choice of 280,000 frequencies. You won’t enjoy a free-wheeling VFO knob experience; your fingers will feel the love as you hunt for POTA on those icy Winter outings.

RF power output is either 3 or 30 watts, fed by rechargeable 1.0 or 3.3 Ah 24-volt Ni/Cad batteries. They are brutes that clip to the base of the unit. Operators could stay in a forward position without returning to base for a recharge, since the PRC-320 can use an accessory hand generator with a 1.0 Ah battery. So there’s a lot of cranking.

Oddly—or tactically—transmit power is reduced by 1/2 in the High power setting after a few seconds, perhaps to establish contact with another operator, then force them to listen harder, or to confuse enemy combatants looking for RF signatures. Most likely scenario: it saves battery.

The tuning section sets this radio apart. It accommodates long wires and whip antennas by electrically matching antenna length to the frequency in use. It’s not automatic. There is a handy reference chart mounted to the chassis with frequencies and lengths and coded tuner settings, making it dead-easy for operators to get the rig up without having to remember antenna math.

The small CW key accessory wraps to the knee or arm. Like every component of the Clansman system, it’s a robust, combat-ready piece. You’ll see this in action once I get up to 20 WPM. Someday.

The Clansman system was deployed throughout the world, and saw early action in Zimbabwe and the Falkland Islands war. The British Army migrated to other platforms over the years, while the PRC-320 served in the UK's Cadet Forces training until about 2015.

You can buy these amazing radios and accessories on the used market, and there are dedicated user groups built around this solid piece of military ware.