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 | J 2 |
L1.5 | L 1 4 |
| L 1 7 | L 1 6 |
60 | @ | (gl |
| @ |
|
|
|
|
LACES)
@
0@
L 1 4 | L 1 7 | L 1 6 | L 1 8 |
Figure 1. A6A9 Phase Lock Assembly, Internal and Front Views
A6A9 3