User's Manual

4-20
CAUTION
DO NOT attempt to change the operating frequency while the
transmitter is keyed on. Although the radio set will not be
damaged, the radiated frequency will be uncontrolled during
tuning and can cause unnecessary interference to other radio
systems.
CAUTION
DO NOT install the LOS antenna on the transceiver during testing
in the transmit mode with (1) the cover removed or (2) the
transceiver powered from an external power supply via test leads
that are unshielded. RF from the antenna can radiate into the
transceiver, circumvent the protection loops, and cause severe
damage to the transmitter circuits.
4-2.3.1 Frequency Accuracy and FM Power Output
1. Set up the test equipment as shown in Figure 4-2. Connect the
VERT/SINAD/DIST/DVM/COUNTER IN connector to the DEMOD connector on the
R2600. For now, do not connect the R2600 MOD OUT port to either pins B or H of the X-
Mode connector on the URC-200 (V2). Also for now, do not connect the PTT (Push-to-
Talk) line (pin F) to ground. Note, when the PTT line is grounded the URC-200 (V2)
transmitter is keyed and begins transmitting.
2. Set the input power supply to 28 .1 Vdc.
Figure 4-2. Transmitter Test Setup