| GENERAL |
| Type: | Amateur HF transceiver |
| Frequency range: |
TX: 10-160 m + WARC MHz
RX: 0.1-30 MHz
|
| Tuning steps: | Down to 10 Hz |
| Frequency stability: | ±? ppm |
| Mode: | AM / FM / SSB / CW / FSK |
| Channels / memory management: |
60 regular (Duplex)
1 scratch pad
1 programmable scan (1 band edge pair)
RAM storage with non-replaceable backup battery (inside CPU!)
|
| Repeater shift / offset: | No dedicated. Use VFO A/B split instead |
| Power supply: | 13.8 VDC |
| Current drain / power consumption: | RX: Max 2 A
TX: Max 20 A |
| Antenna impedance / connector: | 50 ohm / SO-239
50 ohm / Phono (RCA) for RX only |
| Dimensions (W*H*D): | 375*146*432 mm (14.75*5.75*17") |
| Weight: | 7.25 Kg (16 lb) |
| Other features: | Full QSK. RS-232C. VOX. NB. PBT. Transverter jacks. |
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| RECEIVER SECTION |
| Receiver system: |
Triple conversion superheterodyne
1st IF: 70 MHz
2nd IF: 9 MHz
3rd IF: 6.3 MHz (455 KHz for FM)
|
| Sensitivity: |
AM (10 dB S/N):
0.1-1.6 MHz: 3.5 uV
FM (12 dB SINAD):
0.1-1.6 MHz: 1 uV
SSB/CW/FSK (10 dB S/N):
0.1-1.6 MHz: 0.5 uV
|
| Selectivity: |
AM, standard filter
6 KHz (-6 dB)
11.25 KHz (-60 dB)
FM, standard filter
15 KHz (-6 dB)
30 KHz (-60 dB)
SSB/CW, standard filter
2.4 KHz (-6 dB)
4.5 KHz (-60 dB)
|
| Image rejection: | >80 dB |
| AF output power / speaker: | 1.5 W at 2% distortion / 4 ohm |
| External speaker connector: | 1/4"-jack, 4-16 ohm |
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| TRANSMITTER SECTION |
| RF output power: |
| Pwr |
|---|
| AM: | 0-100 W |
| FM: | 0-100 W |
| SSB (PEP): | 0-100 W |
| CW: | 0-100 W |
100% duty cycle up to 20 minutes
|
| Modulation system: | SSB: Balanced modulation |
| Max FM deviation (Factory set): | ±5 KHz |
| Spurious emissions: | Better than -45 dB |
| Microphone impedance / connector: | 200 ohm to 50 Kohm / 4-pin (Metal locking ring connector) |
| Microphone input level: | ? mV |
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| MISCELLANEOUS |
| Manufactured: | USA, 1993-199x (Discontinued) |
| Additional info: | |
| Related documents: | User manual (11.8 MB) |
| Modifications and fixes: | |
| Reviews: | |
| Options / Accessories: |
236
238
239
257
259
282
285
288
305
700C
705
961
5061
RM-500
|
Remote control cable for connecting to either 253 or 420
2 KW manual antenna tuner
Dummy load
Voice synthesizer
Universal ALC annunciator
250 Hz CW filter. IF: 6.3 MHz
500 Hz CW filter. IF: 6.3 MHz
1.8 KHz SSB filter. IF: 6.3 MHz
Serial level converter
Electret hand microphone, 4-pin
Electret desk microphone, 4-pin
Power supply. 13.8 VDC, 22 A. Built-in speaker
Lowpass line filter
Rack mount kit
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