Service manual

Agilent 85309A H20, H21 Operating and Service Manual Modification 17
Revised Operations
All rear panel functional descriptions are the same for the HIGH or LOW
band operations.
J15 Rear Panel Port, HIGH/LOW BAND SELECT
When the front panel BAND SELECT switch is set to EXT, this port can be
used to select the operating band desired by the following TTL levels:
HIGH BAND: > + 4 Vdc
LOW BAND: < 0.5 Vdc
J7 and J8 (using nondiplexed mixers)
These two rear panel ports are not available on the Agilent 85309A H20,
and H21 options.