Motorola EP350 Basic Service Manual

5-8 Radio Programming and Tuning: Receiver Tuning
5.6 Receiver Tuning
There are 4 variations of Receive Squelch Tuning: 12.5 kHz-Band Normal Squelch, 12.5 kHz-Band
Tight Squelch, 25 kHz-Band Normal Squelch and 25 kHz-Band Tight Squelch.
5.6.1 Service Monitor Setting
1. Initial setup using the 8920A RF Communications Test Set
a. Connect “RF IN/OUT” port on 8920A to RF adaptor on radio’s antenna port using a N-Type to
BNC cable. Connect “AUDIO IN” HI and LO on 8920A to “Rx Audio” on test box using two
BNC to BNC cables. Connect the rest according to Figure 5-6. Radio Tuning Setup.
b. On 8920A, press “Rx” under “SCREEN CONTROL”.
c. Using the “CURSOR CONTROL”, key in the items below:
i. RF Gen Freq: Frequency Point (F1 – F5) on Tuner
ii. Amplitude: -128dBm
iii. Atten Hold: Off
iv. Output Port: RF Out
v. AFGen1 Freq: 1.0000 kHz
vi. AFGen1 To: 1.5 kHz for 12.5 kHz channel spacing, 3.0 kHz for 25 kHz channel spacing
vii. AFGen2 Freq: 0.0000 kHz
viii. AFGen2 To: Off
ix. Filter 1: 50 Hz HPF
Figure 5-10. Tx Modulation 25 kHz Window
Table 5-8. Receiver Squelch Tuning
Squelch Type Tuning Range (dB)
Normal 6 – 8
Tight 15 – 17
F1
F2
F3
F4
F5

Motorola EP350 Specifications

General

Channel Capacity	16 channels
IP Rating	IP54
Drop Resistance	1.2 meters
Frequency Range	VHF: 136-174 MHz, UHF: 403-470 MHz
Battery Life	Up to 11 hours
Power Supply	7.5 V (Nominal)
Waterproof	Splashproof
Dimensions	127.6 x 62 x 42 mm (with standard battery)