The Harris RT-1446/URC, AM-7223/URC "Pacer Bounce" High Frequency Radio System.
(URC-119 and URC-121)
These pages started because I bought a RT-1446 transceiver and AM-7223 amplifier on ebay at a good price. I soon realized there was very little information available. At the time manuals were only available from Harris, and at several hundred dollars per copy. Eventually, some copies of manuals became available, mostly copies of the various Air Force TOs. Many of these copies did not include the foldout drawings. Now, the Air Force TOs and Harris Manuals are available on CD Rom at very reasonable prices. I highly recommend anybody considering purchasing one of these radios, or who has one to get proper documentation as most of the questions can be answered by looking it up. The transceiver and amplifier lend it self well to modification because of the construction, and the complete descriptions and diagrams of its circuits in the manuals.
According to the Air Force, "The URC-119 (V) provides long-range HF voice and data communications for Fixed plant, transportable, shelter, and mobile stations. The exceptionally rugged industrial/military design and construction of the URC-119(V) system guarantees reliable operation under demanding field conditions". Pretty close to the truth. This stuff is heavy, rack mounted equipment.
The URC-119(V) operates in the HF range from 1.6000MHz to 29.9999MHz and is tunable in 10Hz increments. It operates in USB, LSB, AME, CW, and AFSK. AFSK is optional and requires AFSK card installation. Tuning the URC-119(V) is a fairly simple two step process: punch in the frequency on the keypad and key the radio. The rest of the tuning process is done automatically, including tuning of the LPA and Antenna Coupler.
The URC-119(V), Pacer Bounce, can be configured for 100/500/1000W power outputs. The most common configurations are 100W and 500W setups. The RT-1446 transceiver, along with the CU-2310 Antenna Coupler, make up the 100W configuration. Adding the AM-7223 RF amplifier boosts the output to 500Ws. The 1000W configuration is a little different from the other setups. The AM-7223 RF amplifier and CU-2310 antenna coupler are replaced by the AM-7224 RF amplifier, PP-7913/URC Power Supply, and URA-38 Antenna Coupler.
Power for the system can be 115VAC, 230VAC, 12VDC, or 28VDC selectable.
The major components, descriptions, and their designations follow.
Transceiver, RT-1446/URC - Harris RF-350K:
Linear Power Amplifier, AM-7223/URC, Harris RF-355.
Linear Power Amplifier, AM-7224/URC, Harris RF-354
Antenna Coupler, CU-2310/URC, Harris RF-351
Resources
RF-350 System Fault Card Page 1
RF-350 System Fault Card Page 2
Airforce trainers guide and skill training manual for URC-119. Good set of instructions and description of equipment in Skill Training Manual section. STM 2E1X3-206
Harris product brochure for the RF-350 series of equipment. Official specifications, etc.
.pdf product brochure for the URC-121.
Manuals available from American Milspec on CD. Buy them from Scott and don't bootleg them. Because Scott took the effort to scan them in to .PDF, we now have manuals available at a reasonable price.
Spare parts can be had at Murphy's Surplus.
