5
HARDWARE ALIGNMENT
RX Audio Input:
On the UED-1B-DMV adjust R5 so that Pin 14 of U2 doesn’t quite clip when a 1 KHz tone
modulated at 3.3 KHz deviation from a signal generator is applied. (Blowing squelch noise should fully clip).
TX Audio Output:
In a wide band system, set the modulation pot R42 to 3.3 KHz (66% of 5 KHz) of deviation per
EIA specifications. In a narrow band system, set the modulation pot R42 to 1.65 KHz (66% of 2.5 KHz) of
deviation per EIA specifications. Set CTCSS deviation to 750 Hz – 1 kHz. In Low-Z mic circuits, it may be
necessary to install JU3.
COR/COS:
If the radio only makes a minute change, it may be necessary to adjust R18, R19, & R20 to cause Q1
to change states.
