| GENERAL |
| Type: | VLF/HF receiver |
| Frequency range: |
0.005-30 MHz (Sixty 500 KHz bands)
|
| Tuning steps: | Analog / continuous |
| Frequency stability: | ? ppm |
| Mode: | AM / SSB / CW / FSK |
| Channels / memory management: |
None
|
| Power supply: | Mains: 115 / 230 VAC
or 11-16 VDC |
| Current drain / power consumption: | Max 200 mA @ 12 VDC + 590 mA for the pilot lamps |
| Antenna impedance / connector: | 50 ohm / SO-239
Hi-Z / ? |
| Dimensions (W*H*D): | 419*194*324 mm (16.5*7.62*12.75") |
| Weight: | 14.51 Kg (32 lb) |
| Other features: | |
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| RECEIVER SECTION |
| Receiver system: |
Single conversion superheterodyne (Below 4 MHz)
IF: 230 KHz
Double conversion superheterodyne (Above 4 MHz)
1st IF: 2.75-3.25 MHz
2nd IF: 230 KHz
|
| Sensitivity: |
0.5-30 MHz:
AM: <2 uV (10 dB S/N)
SSB/CW: <1 uV (10 dB S/N)
0.005-0.5 MHz:
25-200 uV (10 dB S/N)
|
| Selectivity: |
Selectable
8, 5, 2.5 KHz and 500 Hz (-6 dB)
|
| Image rejection: | 0.5-30 MHz: 80 dB average, 50 dB minimum |
| AF output power / speaker: |
Early version: 1 W at 4.4% distortion / No internal speaker
Later version: 1 W at 4.4% distortion / 3.2 ohm
|
| External speaker connector: | 3.2 ohm |
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| MISCELLANEOUS |
| Manufactured: | USA, 1964-1972 (Discontinued) |
| Additional info: |
National's first solid state receiver
New price 1965 in the US: $1295 (Without options)
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| Related documents: |
User manual (3 MB)
Schematic diagram (356 KB)
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| Modifications and fixes: | |
| Reviews: |
73 Magazine: August 1965, page 80
CQ: November 1965, page 51
Monitoring Times: March 1985, page 17
Popular Electronics: August 1965, page 45
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| Options / Accessories: |
HRO-500TS
LF-10
RMK-5
|
Matching speaker
LF preselector
Rack kit
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