Yaesu FT-707 (S)
The Yaesu FT-707 is an HF transceiver for the 80-40-30-20-15-17-12 and 10 meter radio amateur bands. Its construction is based on a metal cased transceiver with a polymer front. The rig can handle the AM, CW and SSB modes on the above mentioned bands and has no general frequency coverage receive options. As a real 1980’s piece of equipment the FT-707 is equipped with numerous whistles and bells displaying a LED ‘lightshow’ in case they are all activated. Depending on ones personal wishes this might be very nice looking or very irritating for someone! Its frequency readout is available in a traditional analog (dish) mode as well as in a large digital display mode.
FT-707 was released in 1986 by the Japanese Yaesu Musen Corporation for appx $ 400 as a ‘compact size’ rig. This type was in production until 1989 and available as FT-707 (100 watt output) and as FT-707S (10 watt output) QRP version.
Technical description
The receiver front end uses a Schottky barrier diode ring module and by means of a developed gain distribution module this results in very good performance in the presence of strong signals. The lownoise premix local oscillator optimizes its receiving performance. Two 8 pole IF filters allow a continuously variable IF bandwidth and 6 pole optional filters are available for demanding operators.
The transmitter output is being generated by 2 multiple protected bipolar 2SC2290 and 2SC 2395 transistors. Final stage protection is included and band switched lowpass filters provide interference protection.
Accessories
- FC-707 antennatuner unit
- FP-707 integrated AC powersupply / speaker unit
- FV-707 external analog VFO unit
- MH-1B, YM-35/36/37 handmikes
- XM-455 C/A/S CW, AM, SSB filters
- YM-34 deskmike
- Metal rack mount
Pros
Even nowadays nice looking. Reasonable transmitting and receiving results. Nice digital readout display. Very clean tx audio. Accessories are regularly second hand available.
Contras
The set is out of production for a long time so keep in mind that obtaining spare parts will not be easy. Well known FT-707 problems are the bandswitches (almost no replacables available). The R/T relay is often subject to malfunction as well as worn out up/dwn pushbuttons. The main tuning knob rubber might be in a deteriorated condition which might be a consequence of a long stay in the sun. Sometimes the SWR protection circuit fails. It drifts sometimes. Weak rx audio because of collapsible strut mount and downwards facing internal speaker.
Tech Specs
- Frequency range: 80,40,30,20,17,15,12,10 m amateurbands (TX and RX)
- Operational modes: AM, CW, USB, LSB
- Transmitter input: AM 80W DC; SSB 240W DC
- Transmitter output: AM 50W; SSB 100W
- Carrier suppression: better than 35 dB
- Unwanted sideband suppression: better than 50 dB @ 14 mHz, 1 kHz mod
- Spurious: at least – 50 dB
- 3rd order distortion products: at least – 30 dB
- Stability: less than 300 Hz from 0-30min after startup
- Receive sensitivity: 25 microV/10 dB S/N SSB/CW; 1 microV/10dB S/N AM
- Selectivity:
- SSB, 2.4 kHz -6 dB, 4.0 kHz -60 dB
- CW, 0.6 kHz -6 dB, 1.2 kHz -60 dB
- AM, 3.6 kHz -6 dB, 6.8 kHz -60 dB
- Image rejection: 80-12m 60 dB, 10m 50 dB
- Antenna: 50 Ohm balanced
- Audio output imp: 4 – 16 Ohm
- Audio output: 3W for 4 Ohm @ 10% THD
- Bandwidth control: continuously variable 300 Hz – 2.4 kHz (SSB)
- Power requirements: 13.8V DC neg grnd
- Current consumption: Rx – DC 1.5A; Tx – DC 20A
- Dimensions: 9.5 x 24 x 29.5 cm with heatsink
- Weight: 6.5 kg