Note
QST, Jan 1971, p. 115.
QST, Jul 1972, p. 120. (HR-2A)
QST, Jul 1973, p. 127. 1973–1978 (HR-2B)
QST, Jul 1978, p. 165. ("Close-Out" sale in Jul 1978. )
The solid-state model HR-2 series features a 10 or 15 watt power output with operation on any of six or 12 transmit and receive channels in the band.
The receiver is a double conversion superhetrodyne with a highly selective ceramic filter for operation on both wide- and narrow-band signals.
The transmitter features phase modulation for carrier stability. Individual trimmer capacitors enable frequency setting for optimum performance in point-to-point or repeater applications.
Built-in SWR load mismatch circuitry protects against open or shorted antenna conditions.
Variations include the HR-2MS, which added a scanning function, and the HR-2S, which was the same as the HR-2MS, but designed for 120 VAC operation. (QST, Aug 1972, p. 116)
An option included the MA-8 four-inch remote speaker.
KEY DIFFERENCES
Channel Capacity:
The original HR-2 was a 6-channel rig.
The HR-2A retained the base 6 channels but included built-in provisions to easily expand to a full 12 channels.
The HR-2B was the most evolved version, featuring a full 12-channel capacity right out of the box.
Power Output:
The HR-2 was rated around 10 Watts.
The HR-2A increased the transmitter power output to approximately 15 Watts.
The HR-2B maintained the higher 15 Watt output (often specified as 15W min.) and added a HI-LO Power Switch to select between the full 15W or a lower power of about 1 Watt.
Transmit Crystal Frequency:
The HR-2B uses different transmit crystals (8 MHz) than the HR-2 and HR-2A (which use 6 MHz crystals).
GENERAL SPECIFICATIONS
RECEIVER
Double conversion, superhetrodyne with highly selective ceramic filter.
Frequency Range 144-148 MHz
I.F. Frequencies •...• l0.7 MHz & 455KHz
Sensitivity: 0.35 uV (nom) 20 db quieting
Selectivity: 6 db Down ± 16KC, 50 db Down ± 32KC
Audio Output: (3-4 ohm Speaker), 3 Watts 10% distortion, 5 watts maximum
Channels: 6 Crystal controlled with provision for adding an additional 6 channels
Speaker: 4 inch
TRANSMITTER
Uses phase modulation. Built in SWR load mismatch circuitry provides protection against open and shorted antenna conditions.
Frequency Range: 144-148 MHz
Power Output: 10 (15) Watts (min) @ 13.6 VDC
Modulation: Phase Modulation with automatic deviation limiting
Deviation: Automatic Limiting with internal adjustments from 0-15KC
Microphone: Piug-in, hand held, high Z ceramic supplied
Channels: 6 (12) crystal controlled with individual trimmer capacitors
POWER
Power Requirements 13.6 Volts (nominal)
Receive (squelched) 180 MA.
Receive (max. audio output): 800 MA.
Transmit: 2.5 Amps (max)
References
Brief description. Electronics World, Jan 1971, p. 82.
Brief description (HR-2B). Popular Electronics, Aug 1973, p. 111.
Narrowband modifications. Ham Radio, Dec 1973, p. 44.
Signal peaking indicator. Ham Radio, Jun 1976, p. 68.
