[Jamie, Koji, Suresh]
We replaced splitters in several demod boards as per the table given below:
Demod boards in which splitter has been replaced on 11May2011
| Demod Board |
S. No. |
Power Splitter |
Frequency range of splitter (MHz) |
Phase unbalance from datasheet (deg) |
Amplitude Unbalance from datasheet (dB) |
| REFL55 |
118 |
PQW-2-90 |
30 to 90 |
90.14 |
0.92 |
| AS11 |
021 |
PSCQ-2-51W |
5 to 50 |
87.49 |
0.1 |
| POY11 |
119 |
PSCQ-2-32 |
3.2 to 32 |
87.58 |
0.05 |
| POY22 |
020 |
PSCQ-2-32 |
3.2 to 32 |
90.26 |
0.02 |
| POY110 |
120 |
PSCQ--120 |
80 to 120 |
90.88 |
0.58 |
While doing a rough check of the boards I noticed that the REFL11 demod board had no signal on the Q output.
Rana also advised that we must use the boards which have the piggy-back amplifiers on those signals which are most useful. We referred to Alberto's thesis and chose POY55 (MICH and SRCL), REFL11(PRCL) and AS55 (DARM) as the most useful signals. We currently have these amps on AS11, REFL11 and AS55. We need to convert either AS11 or REFL11 into a POY55. Since we need to troubleshoot REFL11, I thought we might as well modify that and in the process also fix its Q output. So I renamed AS11 as REFL11 and will convert the old REFL11 into POY55 tomorrow.
Power splitter of different types have different pin-outs. The way we mount a splitter depends on which type we are using. I will detail the mounting scheme in a separate elog tomorrow.
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