Switch and Unlock Detector: When unlock occurs, the output of U4B becomes low, causing
U4C to have a low output. The output of U4D becomes positive, turning off Q5. If no lock
occurs on the search ramp, the delay caused by resistor R27 and capacitor C37 keeps
Q5
off
until the next search cycle begins. This delay is different for an HP 85660A RF Section, and is
set by the value of R27.
Jl
DSI
J2
L1.5
L14
L17
L16
60
@
(gl
@
LACES)
@
0
@
L14
L17
L16
L18
Figure 1.
A6A9
Phase Lock Assembly, Internal and Front Views
A6A9
3