The FT-250's all-tube audio path provides a listening experience described as "less fatiguing" than modern, clinical-sounding rigs. The AGC allows weaker signals to fade into the background noise in a way that feels natural, making long operating sessions more enjoyable. Its maximum SSB input of 300W also provides plenty of punch to break through pile-ups, offering a highly satisfying "talk power".
The receiver is a single or double-conversion superheterodyne (depending on the specific band configuration) utilizing a mix of field-effect transistors (FETs) and bipolar transistors, passing through a highly selective crystal filter. This combination provided excellent sensitivity and a warm, pleasant audio output that many modern operators still prefer over harsh digital signal processing (DSP) audio. The FP-250 Power Supply: A Vital Companion
Operating a Sommerkamp FT-250 in the modern era is a sensory, tactile experience that modern software-defined radios (SDRs) cannot replicate.
High stability heterodyne VFO; within 100 cps every 30 mins after warm-up 16 tubes, 15 diodes, and 7 transistors Weight Approx. 17.5 lbs (8 kg) for the transceiver unit Operational Features Sommerkamp FT 250 Shortwave Transceiver sommerkamp ft 250
Scratchy audio, intermittent signal loss, or erratic band switching are almost always caused by oxidation on the internal wafer switches and potentiometers. A thorough cleaning with a high-quality electronic contact cleaner (such as DeoxIT) usually solves these issues. 4. VFO Drift
Sommerkamp imported the Japanese rigs, rebranded them under his own name, and distributed them across Europe. Consequently, the Sommerkamp FT-250 is structurally identical to the Yaesu counterparts of that era, featuring the exact same robust Japanese engineering but with the coveted Sommerkamp nameplate on the front bezel. Key Technical Specifications
The transceiver was designed for flexibility, using the dedicated FP-250 matching AC power supply for home use, or the DC-250 for 12V mobile or field operations. The FT-250's all-tube audio path provides a listening
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: Requires an external power supply. The matching FP-200/250 AC supply provides all necessary voltages and includes a built-in speaker. Operational Tips
The transceiver features a specialized to ensure excellent carrier suppression and audio shaping. The "Normal/Reverse" sideband slide switch shifts the carrier oscillator relative to the filter, defaulting to Lower Sideband (LSB) on 80/40 meters and Upper Sideband (USB) on 20/15/10 meters. February 2000 QST - YUMPU High stability heterodyne VFO; within 100 cps every
Drake has made The Best better! ... in circuit design, but also in packaging. Compact and lightweight, it is ideal for mobile use, World Radio History FT-200.html
The Sommerkamp FT-250 is an analog, continuous-tuning transceiver built to handle standard pre-WARC amateur bands. Specification 80m, 40m, 20m, 15m, and 10m amateur bands Operating Modes SSB (Selectable LSB/USB), CW, and AM Power Input 240W DC Single-Tone (Approx. 300W PEP Speech Input) RF Power Output ~100 Watts to 130 Watts nominal (dependent on band) Final Amplifier Tubes 2 x 6JS6A (or 6JS6C) television sweep tubes Driver Tube 1 x 12BY7 Receiver Sensitivity 0.5 µV for 10 dB S/N Selectivity 9 MHz crystal filter, 2.4 kHz bandwidth at 6 dB down Antenna Impedance Ωcap omega unbalanced Dimensions & Weight 335 x 140 x 280 mm; ~8 kg (excluding external power supply) Key Features & Architecture 1. Hybrid Circuit Design