Note
QST, Feb 1976, p. 84.
QST, May 1976, p. 72.
QST, Feb 1977, p. 101.
QST, Feb 1981, p. 130.
Developed as an affordable, quality entry point to the 220 MHz band. Clean, simple, and functional without unnecessary "buzzers, bells, whistles, and gadgets."
Features
– Channel Capacity: 12-channel capability. Comes factory-installed with crystals for the 223.50 MHz national simplex frequency. Additional crystal pairs were sold for $8 a pair.
– Power Output: Selectable high/low power output (10 Watts to 1 Watt). Bench testing measured approximately 11.5 Watts in high power and 1.5 Watts in low power.
– Controls & Indicators: Features receive and transmit crystal trimmers, a transmit indicator, and a large illuminated combination S-meter/RF output meter.
– Audio & Connections: Includes a side-mounted built-in speaker, a remote speaker jack, and rear-panel inputs for tone burst and outputs for a discriminator meter.
– Protection: Includes built-in SWR protection—when presented with high SWR or a direct short, it automatically scales back output or refuses to transmit to prevent damage.
Specifications
– Frequency Coverage: 220.00 to 225.00 MHz
– Semiconductor Count: 30 Transistors, 1 FET, 2 ICs, 12 Diodes
– Antenna Input Impedance: 50 ohms
– RF Power Output:
High Power: 10W
Low Power: 1W
– Frequency Control: Crystal (18 MHz) multiplied times 12
– Maximum Frequency Deviation: ± 5 kHz
– Modulation System: Variable reactance phase modulation
– Audio Input Impedance: 10k ohms
– Microphone: 10k ohms dynamic microphone with push-button switch
– Spurious Emission: -60 dB
– Receive Frequencies: 12 channels for the 223 MHz band (includes built-in crystal units for 1 channel)
– Reception System: Double Superheterodyne
– Intermediate Frequencies (IF):
1st IF: 10.7 MHz
2nd IF: 455 kHz
– Sensitivity:
Better than 0.5 uV for 20 dB quieting
S+N/N at 0.5 uV input: 12 dB or more
– Squelch Threshold: Less than 0.3,muV
– Spurious Response: -60 dB
– Bandwidth:
± 6 kHz at -6 dB point
± 12 kHz at -50 dB point
– Audio Output Power: 2.0W
– Audio Output Impedance: 8 ohms
– Frequency Control: Crystal (53 MHz) multiplied times 4
– 4-prong plug for Tone Burst Generator and Discriminator Meter
– Crystals installed for 223.50 MHz SIMPLEX
Power requirements: DC 13.8 V ± 15% (negative ground)
– Current Drain:
Transmit (HI - 10W): 3.1A average
Transmit (LOW - 1W): 1.1A average
Receive (Squelched): 220mA
