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General| Brand | Intek |
|---|---|
| Model | M-490 Plus |
| Category | Transceiver |
| Language | English |
Basic operational parameters, physical dimensions, and weight.
Details receiver sensitivity, audio distortion, rejection ratios, and current drain.
Covers output power, modulation, frequency response, and current drain.
Guide to turning the unit on, setting channels, and adjusting volume/squelch.
Instructions on using the push-to-talk button for transmission and reception.
Explains RF amplification, spurious suppression, power limiting, and modulation control.
Details the dual conversion super-heterodyne receiver system and its blocks.
Overview of frequency derivation and PLL operation from a 4.5 MHz crystal.
Explains VCO tuning range and switching for transmission/reception.
Details first and second mixer operations for receiver local oscillations.
Shows pinout and lead identification for IC101.
Shows pinout and lead identification for IC102.
Shows pinout and lead identification for IC9.
Shows pinout and lead identification for IC104.
Visual identification and lead markings for common diodes.
Visual identification and lead markings for common transistors.
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