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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

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