Note
QST, Dec 1967, p. 149.
QST, Feb 1968, p. 139.
Imported.
The Lafayette Model HA-750 is a compact, self-contained, fully transistorized combination transmitter and receiver designed to cover the most popular portion of the 6-meter amateur band (50-52 MHz). Its compact size and ease of operation make this unit ideally suitable for 12 volt DC (negative ground only) mobile operation, or "fixed" station operation with the optional solid state AC power supply (Lafayette Model HB-502).
It is supplied complete with PTT dynamic microphone, a fused power cable for DC operation and a mobile mounting bracket. Housed in a rugged metal case, the transmitter, receiver and audio sections employ rugged; heat-resistant silicon transistors in all critical areas to assure trouble-free, dependable operation.
Equipped with 18 transistors, 8 diodes and 2 zener diodes, the unit employs a continuously tuneable superheterodyne receiver circuit with one stage of RF and three stages of IF, and a seven-stage crystal or VFO controlled transmitter for precise dependable performance. The transmitter is designed to operate with an input of 5 watts to the final RF stage, and offers full VEO or crystal-controlled operation.
When using VFO operation, the transmitter frequency tracks with the frequency of the receiver. When operating the unit crystal-controlled, the transmitter operates independently of the receiver, and the frequency of transmission is determined by the crystal being used. The unit is normally supplied without crystals but may be operated by inserting any third-overtone HC-6U crystal into the socket provided.
Specifications
– Frequency Coverage: 50–52 Mc.
– Fine Tuning Range: ±200 Kc.
– Sensitivity: 1 µV for 10 db S+N/N.
– Selectivity: 7 Kc–6 db, 40 Kc–30 db.
– Intermediate Frequency: 1.65 Mc.
– Antenna Impedance: 30–100 ohms (Nominal 50 ohms).
– Audio Output: 2 watts.
– Frequency Control: VFO or crystal.
– Power Input: 5 watts.
– Antenna Impedance: 30–100 ohms (Nominal 50 ohms).
– Transmission Mode: A3 emission (AM).
– Crystal Type: HC-6U 3rd overtone.
Power Source: 11.5 to 14.5 volts DC
Current Drain (@12.6 VDC):
Receive: 65–600 mA
Transmit: 650 mA
References
Brief description. Ham Radio, Apr, p. 91.
