Radio Shack 20-521 owner manual Frequency Step Transmission Range MHz KHz

Flexible Antenna with BNC Connector — provides excellent reception and is designed to help prevent an- tenna breakage. Or, you can connect an external an- tenna.

Monitor Memories — let you temporarily store up to 5 frequencies or IDs.

Memory Backup — keeps the frequencies stored in memory for an extended time if the PRO-91 loses pow- er.

Three Power Options — let you power the scanner using internal batteries, external AC power using an optional AC adapter/charger, or DC power using an op- tional DC cigarette-lighter power cable.

Key Confirmation Tones — the scanner sounds a tone when you perform an operation correctly, and an error tone if you make an error.

Battery Save — saves battery power when the scan- ner does not detect any transmissions for more than 5 seconds when a channel is manually selected.

Battery Low Alert — warns you when battery power gets low.

Your scanner can receive these bands:

Frequency	Step	Transmission
Range (MHz)	(kHz)
29–29.7	5	10-Meter Ham Band
29.7–50	5	VHF Lo
50–54	5	6-Meter Ham Band
108–136.9750	12.5	Aircraft
137–144	5	Military Land Mobile
144–148	5	2-Meter Ham Band
148–174	5	VHF Hi
406–420	12.5	Federal Government
420–450	12.5	70-cm Ham Band
450–470	12.5	UHF Standard Band
470–512	12.5	UHF “T” Band
806–956	12.5	Public Service
		“800” Band, except
		cellular band

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