Note
The HW-22A is identical to the HW-12A except for frequency coverage.
The basic specifications for the “A” series Single-Banders are the same as for the originals. Most of the changes are related to operating convenience. Refer to HW-12 and HW-12A for a discussion of basic features. Caution: Operate on 250 VDC only.
Frequency coverage for the HW-22A is 7.2 to 7.3 MHz.
References:
Better dial mechanism. QST. Jun 1968, p. 36.
Noise limiter. Ham Radio. Mar 1971, p. 67.
A receiver pre-amp for. CQ. Mar 1976, p. 26.
VFO slippage and backlash. QST. Sep 1976, p. 39.
Extended coverage. CQ. Jan 1979, p. 65.
Extended coverage. QST. Jun 1981, p. 37.
Receiver Section
Frequency coverage: 7.2 to 7.3 MHz
Receiver mode: lower or upper sideband
Sensitivity: 1.0 µV input will provide at least 15 db signal plus noise to noise ratio
Selectivity: 2.7 kHz @ 6 db, 6 kHz @ 50 db
IF: 2305 kHz
Image rejection: 100 db
IF rejection: 50 db
Receiver audio response: 400 to 3000 Hz
Receiver audio power output: 1 watt
External speaker impedance: 8Ω
Antenna input impedance: 50Ω nominal, unbalanced
Transmitter section
Frequency coverage: 7.2 to 7.3 MHz
Transmitter mode: lower or upper sideband
Stability: less than 200 Hz per hour after one-hour warmup
RF power output: 200 watts PEP
Unwanted sideband suppression: 45 db minimum below peak output @ 1000 Hz
Carrier suppression: 45 db minimum below peak output
Output impedance: 50Ω nominal, unbalanced
Transmitter audio response: 400 to 3100 Hz
Microphone required: hi-Z crystal, ceramic or dynamic; 10 mV minimum output
Power requirements:
800 VDC at 250 mA
250 VDC at 100 mA
–125 VDC at 5 mA
12 volts AC or DC at 3.75 amps
Size: 12.25 wide x 6.25 high x 10 deep; Weight: 12 lbs
Tubes: (3) 6EA8, (5) 6AU6, (1) 6BE6, (1) 12AT7, (1) 12BY7, (1) 6EB8,
(2), 6GE5
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.