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Last modified 2023-07-07

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National HRO-600

A picture of National HRO-600
NB! The receiver on this picture has the 601 option fitted

SPECIFICATIONS

GENERAL
Type:VLF/HF receiver
Frequency range: 0.016-30 MHz (Thirty 1 MHz bands)
Tuning steps:Analog / continuous
Frequency stability:±20 Hz after 30 minutes warmup
Mode:AM / SSB / CW
Channels / memory management: None
Power supply:Mains: 115 / 240 VAC
or 12 VDC
Current drain / power consumption:Max 50 W @ mains
Max 200 mA @ 12 VDC
Antenna impedance / connector:50 or Hi-Z selectable / SO-239
Dimensions (W*H*D):432*133*386 mm (17*5.25*15.5")
Weight:18.1 Kg (40 lb)
Other features:




RECEIVER SECTION
Receiver system: Single conversion superheterodyne (Below 1 MHz)
IF: 5 MHz
Double conversion superheterodyne (Above 1 MHz)
1st IF: 55 MHz
2nd IF: 5 MHz
Sensitivity:0.38 uV (10 dB (S+N)/N)
Selectivity: Selectable
8, 2.4, 2, 1 KHz and 350 Hz (-6 dB)
Image rejection:90 dB
AF output power / speaker:1 W at 10% distortion / ? ohm
External speaker connector:




MISCELLANEOUS
Manufactured:USA, 1970-1981 (Discontinued)
Additional info: Motorized preselector.
Rare. Allegedly, only 200 were made.

New price 1970 in the US: $5600.00
Related documents:
Modifications and fixes:
Reviews:Communications World: Spring-Summer 1977, page 8
Options / Accessories:
601
602
603
610
620
640
650
660
Tunable VFO module with nixie tube type display
Thumbwheel-operated frequency selector
Crystal oscillator
DC power supply
Noise blanker
ISB adapter
FSK converter
Diversity unit