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The HRO Senior series (sometimes known as the HRO-series) embodies an S-Meter, crystal filter circuit with phasing and selectivity controls, and coils sets A, B, C and D which have a bandspread feature. It was availablewith either 2.5 or 6.3 volt tubes.
The frequency range is determined by use of removeable, slide-in coil packs:
Type J = 50 - 100KHz
Type H = 100 - 200KHz
Type G = 180 - 430KHz
Type F = 480 - 960KHz
Type E = 900 - 2050KHz
Type JD = 1.7 - 4.0MHz
Type JC = 3.5 - 7.3MHz
Type JB = 7.0 - 14.4MHz
Type JA = 14.0 - 30.0MHz
Original cost: USD 230.-
General characteristics
- HAM bands
- ?
- Frequency stability
- ?
- Tuning steps
- ?
- Memories
- ?
Receiver
- RX-range
- 0.05-30 MHz depending on coil pack
- Modulations
- AM CW
- Sensitivity
- ?
- Selectivity
- ?
- Filters
- ?
- Receiver system
- Single conversion
- IF-frequencies
- ?
- Image rejection
- ?
- Audio output
- Requires external output transformer of 7,000 ohms impedance and external speaker.
Connections
- Antenna
- -
- Impedance
- 50 Ω
- Other
- -
Electrical
- Power requirements
- ?
- Current drain RX
- ?
- TX
- -
Physical
- Dimensions (w×h×d)
- ?
- Weight
- ?
- Form factor
- Base Station
- Manufactured
- Between 1934 and 1943 in USA
Other features
- Usage
- Amateur / Ham radio operators
- Features + options
- -
- Accessories
- -
- RigReference ID
- 3622
- MPN
- NATIONAL-COMPANY-HRO-SR
Manuals, diagrams and brochures
-
No documents available for this particular model.
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New and second-hand prices
Estimating the value of a rig can be challenging. We collect prices paid by real hams over the years to help you estimate the value of a used National Company HRO-SR. Just bought or sold this model? Let us know what you traded it for and help other ham operators!
These estimates are based on the following prices:
Links & tools
- Search YouTube for National Company HRO-SR videos
- Search Google for National Company HRO-SR information
- Search Google Images for National Company HRO-SR
- Search Twitter for National Company HRO-SR news
- Search Wikipedia for National Company HRO-SR information
- Search the Boat Anchor Manual Archive (BAMA) for National Company HRO-SR for manuals and documents (using Google)
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