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Message ID: 982
Entry time: Mon Sep 22 22:24:19 2008
In reply to: 980
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| Author: |
rana |
| Type: |
Configuration |
| Category: |
PSL |
| Subject: |
bad FSS |
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| Quote: | | The MC refl power was going up and the FSS PC drive was so large that I had to turn up the FSS... |
Looks like I bumped the PS for the 21.5 MHz test setup and changed the supply voltage of the amplifier
from +24 to +38 V. This made the amplifier go hot after a few hours and the output eventually dropped.
Yoichi and I walked out there now and it was too hot to touch. We turned it off and put it on a heat
sink to make it chill out and it came back after a few minutes. We have set the input to the amp to
be -7 dBm instead of -8 dBm after deciding that we should take into account the 1 dB loss in the cable
run and deliver a real +17 dBm to the mixer.
The right way is to calibrated the LO mon of the FSS. |