PRC-6 Radio
UPDATED 4/29/2023 Beginnings of some notes on the hand held Radio Set AN/PRC-6 FM radio. There is lots of information on the Web regarding these radios so I will just […]
GENSETS for AN/GRC-109 – RS1 and RS-6 Radio Sets
UPDATED 4/28/24 Known Gasoline GENSETS for, or usable with the AN/GRC-109, RS-1 and RS-6 systems: My favorite sets for field Ops. The UGP-12. 125 Watts, 115 VAC, 400 cps, 2-stroke […]
Boundary Waters Canoe Area
Some long-lost Pix and notes from a 7 day trip I took to the Boundary Waters Canoe Area in Superior National Forest in the summer of 1973. The BWCA is […]
Coastal River Division 21 Comm Center
CRD21 Comm Center: Well, lets start here because this is one place the boats communicated with (and this site is about Combat Comms!). We built a shore Comm Center in […]
Coastal River Division 21 / Ops
UPDATED 16JAN21 On 16 June, 1973, CRD21 was Commissioned at the Great Lakes Naval Base near Chicago as the US Navy began to turn its attention to NATO operations in […]
GRC-9 Receiver Dial and Panel Illumination
UPDATED: 5JAN14 The dial light in the GRC-9 receiver is pretty dim. I thought about shunt powering an LED off the receiver B+ line via a dropping resistor but that […]
PTF Firepower
Gunnery exercises aboard PTF’s. (Bad Guys take note…) UPDATED 8/18/2025 Below is a “shot” of GMG2 “Bobby” and GMG2 (SEAL) “Bob” preparing to fire an 81 mm mortar flare round. […]
SEAL Training Ops at Coastal River Division 21
The Coastal River Divisions were stood up in-CONUS in 1972 after redeployment from Vietnam. They had PTF’s, PG’s, PBR’s and other combat craft to retain the capabilities employed by the […]
R-390A HF Receiver
Updated 2/7/2022 I have had my Collins-designed receiver for many years, it is superb on CW as one would expect and it sounds good on AM. Probably hard to beat […]
Temporary Posts
A placeholder for quick posts from the Ready Service Locker. Snapshot of N6CC Bench Chaos Challenge 4/2020… While investigating the Burst Keying circuits in the RT-6 (CIA RS-6) transmitter. Furuno […]