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Last modified 2008-01-23

National HRO-500

Type:HF receiver
Frequency range:0.005-30 MHz (60*500 KHz bands)
Mode:AM/SSB/CW/FSK
Receiver system:Triple conversion superheterodyne
1st IF: ? MHz
2nd IF: ? MHz
3rd 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:N/A
Image rejection:0.5-30 MHz: 80 dB average, 50 dB minimum
Voltage:11-16 VDC or mains 115/230 VAC
Power consumption:Max 200 mA @ 12 VDC + 590 mA for the pilot lamps
Impedance:50 ohms, SO-239 and Hi-Z
Dimensions (W*H*D):16.5 x 7.62 x 12.75"
Weight:32 lbs
Manufactured:USA, 1964-1972 (Discontinued)
Other:National's first solid state receiver
New price 1965 in the US: $1295 (without options)
Related documents:User manual (3 MB) Schematic (356 KB)
Modifications: