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General| Brand | Lowe Electronics |
|---|---|
| Model | HF-150 |
| Category | Receiver |
| Language | English |
Describes RF signals converted to 45 MHz and 455 kHz intermediate frequencies.
Details the three supply rails, regulators, and battery operation.
Explains LO, HET, CAR signal generation for receiver tuning.
Explains how the PLL controls the local oscillator frequency using a reference.
Details the microcontroller's role in receiver operation and control.
Describes the receiver's built-in test and alignment routines.
Lists test points and their corresponding voltages/signals.
Explains fault indications and tests for the control system.
Details the adjustment of the reference oscillator frequency.
Covers adjustment of the heterodyne oscillator for audio output.
Describes the adjustment and checks for the local oscillator coil.
Details sensitivity tests and alignment of the IF transformer T4.
Explains adjusting TC3 for minimum SINAD in the input filter.
Describes sensitivity tests for the whip aerial pre-amplifier.
Describes testing the microcontroller and display via the MEM button.
Explains testing the EEPROM for frequency memory integrity.
Specifies DC supply voltage and typical power consumption.
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