agenda log

1. 430 Transmitter

documentation - keep at it

magnet - get lower unit from Tab - check every winding of magnets for dc resistance and

inductance

meter relays - get them replaced!

modulator upgrade: separate fiber optic control lines to decouple the two decks.

Test procedures to trouble shoot the decks. Fiber optic monitor ports into the decks.

2. Tiedown system

lightning protection - move ground connections

encoder - lower voltage

digital noise - purge

servo loop - revisit theory

3. 430 transmitting from dome

turnstile

collector

waveguide installation

monoplexer driver

directional coupler to monitor tx power from Gregorian (move from the old OMT to one of the half-height sections feeding the dome).

4. Receiver cold load

electrical design

cryo design

Develop self-cal for Trcvr, i.e. Thot, Tcold, Tant switch built into the dewars.

5. Receiver calibration

does WTG have correct spreadsheet program? - old Trcvr calculation was wrong

Get a test dewar into operation. Improve heated resistor method to measure Trcvr.

6. VLBI

track Signatron progress & Haystack checkout schedule

build upstairs phase cal heads

7. Tertiary

8. Vertex Drive System: highest priority: working spares for PLC & LCU

Put the program development system(s) into good working order. Practice card swapping procedures.

9. finish monoplexer driver for 430 systems

10. reinstall hfss on repaired Dell computer

Week of Monday, 11-20-00 (3-day work week)

debug rotary floor failure - Mon. morning - no documentation available for

floor and tiedown disable/enable switches - had to trace cable thru trench

monoplexer driver

schedule haystack/signatron/trucking/airline

switch to andy's pc (take home zip disk and copy RSI drawing files)

tie down tension monitors

parts for 430 tx metering circuits - need these meters working to install new magnets

Week of Monday, 11-27-00 (5days)

Monday: work on total checkout of monoplexer driver

Tuesday: mount tension meters in tiedown systems and check manual operation (jumper)

Thursday: prepare for trip to Signatron- find all notes and doc. from prev. trip.

find list of deliverables - check tickets, cash, etc.

Week of Monday, 12-11-00

take Tuesday off

Monday: work on total checkout of monoplexer driver

Tuesday: mount tension meters in tiedown systems and check manual operation (jumper)

Week of monday, 12-18-00

drawings for second collector

Redesign totem pole circuit in monoplexer driver

mount tension meters in tiedown systems and check manual operation (jumper)

prepare agenda for Klaus

spare cards

lcu pack, including irig reader

software flowcharting questions

vlbi - check progress with Signatron and Haystack (Dan Smythe)

dummy load for kollmorgen power supplies

az encoder error - ch end

vertex-vlbi-430tx-tiedowns-430greg(monoplexer)

regen card

dummy load for Kollmorgen power supplies

Week of 1-8-01

monoplexer driver: made new floating deck design for 1 usec pull up.

troubleshoot markIs to get going on 430 from greg.

Sulzer's special filter - takes one LTC1562 (quad second-order filter chip)

+ a couple of op amps.

+