Motorola HT 1000 Transceiver Board Identification, Transmit Deviation Limit Reference

Table 17 Transmit Deviation Limit Reference

Channel Spacing	Deviation (kHz)
20 KHz	3.40 - 3.60
12.5 KHz	2.20 - 2.30

4.Press F6 to dekey the radio, and press F8 to program the softpot value.

5.Press F10 to return to the TRANSMIT menu.

VCO Crossover Frequency

NOTE: This procedure is only required after the field repair of a VHF or UHF VCO.

In order for a phase-locked-loop to tune very wide bandwidths, both negative and positive control voltages (Vcntl) are required. This procedure sets the crossover frequency at which the negative Vcntl (or –Vee) switches from zero to negative.

Transceiver Board

Identification

VHF Radios	VHF transceiver board NUD7070 and NUD7085 (“C” and later) kits
	include new VCO varactors, and are factory aligned with a new
	transmit VCO crossover frequency of 164.850MHz.
	Since the transmit crossover frequency has changed, whenever
	transmit VCO crossover alignment (an RSS function) is performed,
	circuit board identification will be important. The “C” kits can be
	identified by the circuit board number 5511Y02 or 5511Y32 visible on
	side 2 of the board, located along the circuit board edge just next to
	crystal filter FL1. All future VHF transceiver boards will be in the
	“5511Y” series.
	Anytime a controller board or transceiver board is replaced in a radio,
	it will be necessary to perform the RSS transmit VCO crossover
	alignment, and check the transmit VCO crossover frequency. The RSS
	screenforthisalignmentwillshowa“currentvalue”box
	with a frequency already assigned, placed inside the box. When
	performing transmit VCO crossover alignment, first check the
	transceiver circuit board number. In a VHF radio:
	• If the board number is any “5511Y” series number, other than
	5511Y01 or 5511Y31, the transmit VCO crossover frequency in the
	“current value” box should be 164.850MHz. If it is not, change it
	to 164.850MHz.
	• If the board number is 5511Y01, 5511Y31 or any other number
	not in the 5511Y series, the transmit VCO crossover frequency in
	the “current value” box should be 161.50500MHz. If it is not,
	change it to 161.50500MHz.

24