Power levels, compression
190222:
polA,B phase difference vs freq using lbw.
190111_iflo_sbc2_cables.html190111:
loose cable in polA, subband2, downstairs if/lo.
170310: RF,IF attenuators.
description, switching times, and ifAttnPOlB problem
12dec16: polB if1
attenuator fails
Solution: see 170310.. problem was bent pin
in cable.
12jun15:
upstairs first lo switches from 1hz to 1Khz resolution
09sep12 2ndlo
synthesizers 1-4 hang up. Remain at fixed frequency till 11sep12
05sep12
atm power profiles show cal dropouts. cal multiplexer receiver
chip?
22jun11: IF2 rack polB +5volt power supply failed.
27nov06
check
the
linearity of the programmable gain in the downstairs IF2
26oct06:
lbw
cable
test with upstairs iflo shows loose cable in 750 Mixer
chassis.
05sep03:
increasing
the
isolation for monitor port 1A in the downstairs IFLO.
23apr03:
Poor
isolation
in the downstairs iflo monitor ports.
Documentation (manuals)
hp87130a switch driver
(upstairs if1).
See also:
Alfa
if/lo diagrams
In developement:
12meter
UDC
schematic (.pdf)
Dana's 12meter if insertion in the
standard system (version 2: 23ap10)(.pdf)