Note
The Kenwood TR-7950 and TR-7930 are 2-meter FM transceivers designed for both mobile and fixed-station use. While they share most features and physical dimensions, the primary difference lies in their power output: the TR-7950 delivers a hefty 45 watts, while the TR-7930 provides a modest 25 watts.
The units were widely considered "workhorse" radios for their time, known for being built like tanks and offering a high-power mobile option that was relatively uncommon for the era. They remained in production until 1985, when they were succeeded by the TM-series transceivers
Features
– Display & Indicators: Features a large, backlit LCD digital display that is easy to read in direct sunlight or darkness. It displays transmit/receive frequencies, memory channels, repeater offsets (+, S, -), and sub-tone data.
– Memory System: Equipped with 21 multi-function memory channels.
Memories 1–15: Store simplex or ±600 kHz offset frequencies.
Memories 16/17 and 18/19: Paired for non-standard ("odd-split") repeater offsets.
Memories A and B: Set the upper and lower limits for programmable band scanning.
– Scanning Options: Supports programmable memory scan, band scan, and priority alert.
– Scan Resume: Selectable between automatic time-operated (approx. 5 seconds) or carrier-operated resume.
– Memory Lock-out: An "L0" key allows the user to skip selected memory channels during a scan without erasing them.
Center Stop: Automatically stops on the channel center during a band scan, accompanied by a "Center Tuning" indicator.
– Power: Both models include a HI/LOW power switch to reduce output to approximately 5 watts for local communication.
– Autopatch: Includes a built-in 16-key DTMF autopatch pad.
– Memory Back-up: A built-in lithium battery maintains memory data even when the unit is disconnected from power, with an estimated life of five years.
– Automatic Offset: Pre-programmed for standard ±600 kHz offsets according to the ARRL 2-meter band plan.
– Extended Coverage: Covers 142.000 to 148.995 MHz in 5-kHz steps.
Technical Specifications
– Frequency Range: 144.000 to 147.995 MHz
– RF Output Power (High/Low)
TR-7930: 25/ 5 watts adjustable
TR-7950: 45 / 5 watts adjustable
– Mode: FM
– Spurious Radiation: Less than -70 dB.
– Receiver Circuitry: Double Superheterodyne
– Intermediate Freq.
1st: 10.695 MHz; 2nd: 455 kHz
1st: 10.695 MHz; 2nd: 455 kHz
– Sensitivity: Better than 12 dB for 0.25 µV SINAD
– Audio Output: > 2.0 Watts across 8 ohms
– Antenna Impedance: 50 ohms
– Operating Temperature: −20∘C to +50∘C.
– Microphone: Dynamic microphone with PTT switch, 500 Ω.
Power Requirement: 13.8V DC ±15% (Negative ground only).
Current Drain (HI TX): 6.5/9.5 amps
Current Drain (LOW TX): 2.5/3.0 amps
