| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15869
|
Fri Mar 5 15:31:23 2021 |
Koji | Update | LSC | REFL55 demod board rework | Missed to note: The IF test was done at
TP7 and TP6 using pomona clips i.e. brefore
the preamp. |
|
|
8412
|
Thu Apr 4 10:32:42 2013 |
Gabriele | Summary | LSC | REFL55 error signals | The attached plot shows that also the behaviour
of the REFL11 and 55 signals is qualitatively
equal to the simulation outcome. |
|
|
8413
|
Thu Apr 4 10:46:54 2013 |
Koji | Summary | LSC | REFL55 error signals | Beautiful double peaks. I don't see the
triple zero-crossings. Is this because you
adjusted the phase correctly (as predicted)? |
|
|
2789
|
Mon Apr 12 16:20:05 2010 |
Alberto | Configuration | 40m Upgrading | REFL55 improved | During the commissioning of the AS55
PD, I learned how to get a much better rejection
of the 11MHz modulation.
So I |
|
|
4622
|
Wed May 4 12:07:48 2011 |
Suresh | Update | RF System | REFL55 installed on the AP table | REFL55
has been installed on the AP table.
REFL11 has been moved to make space for a |
|
|
11208
|
Wed Apr 8 13:26:47 2015 |
ericq | Update | LSC | REFL55 signal back to its normal ADC inputs | As the POP55 demod board is actually demodulating
the REFL55 signal, I have connected its outputs
to the REFL55 ADC inputs. Now, we can go |
|
|
17419
|
Wed Jan 25 11:35:20 2023 |
yuta | Summary | BHD | REFL55 visually inspected, BH44 Kapton taped | Following was done to investigate 60 Hz
noise issue, but no significant change in
the FPMI noise observed. |
|
|
17421
|
Wed Jan 25 14:33:07 2023 |
rana | Summary | BHD | REFL55 visually inspected, BH44 Kapton taped | Kapton tape is a good insulator, so its
a good block for 60 Hz. But it is mostly
useless for RF since the capacitance between |
|
|
13280
|
Thu Aug 31 00:52:52 2017 |
gautam | Update | LSC | REFL55 whitening board debugging | [rana,gautam] |
|
|
15977
|
Mon Mar 29 19:32:46 2021 |
gautam | Update | LSC | REFL55 whitening checkout | I repeated the usual whitening board characterization
test of:
driving a signal (using |
|
|
14961
|
Wed Oct 9 22:02:58 2019 |
gautam | Update | LSC | REFL55 whitening issue | This
problem has re-surfaced. Is this indicative
of some problem with the on-board VGA? Even |
|
|
333
|
Fri Feb 22 11:11:00 2008 |
rob | Update | Electronics | REFLDD problem found |
I used a network analyzer that actually works
to find a problem in the REFLDD electronics |
|
|
1469
|
Fri Apr 10 04:54:24 2009 |
Yoichi | Update | Locking | REFL_DC for CARM | Suggested by Rob and Rana's simulation works,
I tried to use REFL_DC for the CARM error
signal.
|
|
|
9932
|
Thu May 8 17:00:56 2014 |
rana, Q | Summary | LSC | REFL_DC handoff didn't work last night | Last
night after checking cabling and turning
on ISS, we tried several times to handoff |
|
|
9936
|
Fri May 9 04:51:13 2014 |
ericq | Summary | LSC | REFL_DC handoff didn't work last night |
|
|
|
3223
|
Wed Jul 14 19:15:26 2010 |
Gopal | Summary | Optic Stacks | REVISION: Eigenfrequency Analysis of Single Stack Complete | My previous eigenfrequency analysis
was incorrect by two orders of magnitude
due to the misuse of Young's Modulus information |
|
|
165
|
Wed Dec 5 13:49:08 2007 |
alberto | Update | Electronics | RF AM PD lines monitor | In the last weeks I’ve been working on the
design of an electronic board to measure
directly the power of the main spectral lines |
|
|
2350
|
Thu Dec 3 15:55:24 2009 |
Alberto | AoG | LSC | RF AM Stabilizer Output Power | Today I measured the max output power at
the EOM output of one of the RF AM Stabilizers
that we use to control the modulation depth. |
|
|
12771
|
Mon Jan 30 19:07:48 2017 |
gautam | Update | IMC | RF AM stabilization box pulled out | [johannes, gautam]
We pulled out the RF AM stabilization
box from the 1X2 rack. PSL shutter was closed, |
|
|
12772
|
Tue Jan 31 01:07:20 2017 |
Lydia | Update | IMC | RF AM stabilization box pulled out | [gautam, Lydia]
We looked at the RF AM stabilizer
box to see if we could find out 1) Why the |
|
|
12773
|
Tue Jan 31 13:46:34 2017 |
rana | Update | IMC | RF AM stabilization box pulled out |
What is the probe situation? Ought
to use a high impedance FET probe to measure
this or else the scope would load the circuit.
The |
|
|
12775
|
Tue Jan 31 14:17:48 2017 |
gautam | Update | IMC | RF AM stabilization box pulled out | > What
is the probe situation? Ought to use a high
impedance FET probe to measure this or else |
|
|
12782
|
Tue Jan 31 22:28:39 2017 |
Lydia | Update | IMC | RF AM stabilization box pulled out | [rana, gautam, lydia]
Today we looked at the schematics
for the RF AM stabilizer box and decided |
|
|
12783
|
Wed Feb 1 11:51:19 2017 |
Koji | Update | IMC | RF AM stabilization box pulled out | For a comparison: OMC
ELOG 238 |
|
|
12780
|
Tue Jan 31 22:07:13 2017 |
gautam | Update | IMC | RF AM stabilization box revamp | I've added the schematic of the RF
AM stabilization board to the 40m
PSL document tree, after having created |
|
|
12784
|
Wed Feb 1 16:45:56 2017 |
Lydia | Update | IMC | RF AM stabilizer box Modification Plan | Here's what I'm planning to do
to the RF AM stabilizer box. I'm
going to take out several of the components |
|
|
12785
|
Wed Feb 1 20:49:34 2017 |
rana | Update | IMC | RF AM stabilizer box Modification Plan | I suggest:
Disable the path which
goes to the two spare outputs. Replace the |
|
|
12786
|
Wed Feb 1 23:13:30 2017 |
Lydia | Update | IMC | RF AM stabilizer box Modification Plan | I made some of the changes. Gautam and
I will finish tomorrow.
While I was soldering the sharpest |
|
|
5364
|
Wed Sep 7 22:17:04 2011 |
rana | Update | IOO | RF Amp for EOM on PSL Table | After Steve pointed out the 'deep hoop' |
|
|
5372
|
Fri Sep 9 19:15:17 2011 |
rana | Update | IOO | RF Amp for EOM on PSL Table |
|
|
|
12189
|
Thu Jun 16 12:06:59 2016 |
ericq | Update | LSC | RF Amp installed at POY11 RF output | I have installed a ZFL-500LN on the RF
output of POY11. This should reduce the effect
of the CM board voltage offsets by increasing |
|
|
1959
|
Fri Aug 28 12:56:17 2009 |
Yoichi | Update | Locking | RF CARM hand off problem | Last night, the lock script proceeded to
the RF CARM hand-off about half of the time.
However, the hand off was still unsuccessful.
|
|
|
1960
|
Fri Aug 28 13:49:07 2009 |
rob | Update | Locking | RF CARM hand off problem | [quote]Last night, the lock script proceeded
to the RF CARM hand-off about half of the
time.
|
|
|
4670
|
Mon May 9 17:23:25 2011 |
Suresh | Update | RF System | RF Cables near LSC Rack | [Steve, Suresh]
We started to clean up the RF cables
(heliax and PD interface cables) at |
|
|
4315
|
Thu Feb 17 14:17:27 2011 |
Suresh | Update | Electronics | RF Distribution box and REFL11 |
The Distribution box is several steps
nearer to completion. |
|
|
4579
|
Thu Apr 28 07:14:34 2011 |
Suresh | Update | RF System | RF Distribution box installed | RF Distribution box has been mounted in
the 1Y2 rack and is ready for use.
|
|
|
4342
|
Wed Feb 23 08:53:58 2011 |
Suresh | Update | Electronics | RF Distribution box: Output power levels | We wish to have roughly 2 dBm of output
power on each line coming out of the RF distribution
box. So I adjusted the attenuators |
|
|
4336
|
Tue Feb 22 00:41:34 2011 |
Suresh | Update | Electronics | RF Distribution box: assembly completed | The mechanical assembly of RF distribution
box is 99% complete. Some of the components
may be bolted to the teflon base plate if |
|
|
4337
|
Tue Feb 22 11:53:38 2011 |
steve | Update | Electronics | RF Distribution box: assembly completed |
|
|
|
3529
|
Mon Sep 6 22:09:11 2010 |
Alberto | Update | Electronics | RF Frequency Generation Box heat sink installed and tested | Last week I noticed that the high power
amplifiers in the Frequency Generation Box
became hot after 2 hours of continuous operation |
|
|
4284
|
Mon Feb 14 07:37:13 2011 |
Suresh | Update | Electronics | RF Generation Box: capacitors across power lines |
There were several parts in this
box which did not have shunting capacitors |
|
|
2994
|
Wed May 26 17:10:09 2010 |
Alberto | Update | 40m Upgrading | RF Generation box | This is how the RF generation box might
soon look like:
|
|
|
321
|
Mon Feb 18 12:04:39 2008 |
Alberto | Update | Electronics | RF Monitor (StocMon) | I put the amplifiers next to the monitor on
the PSL table, layed the power and the RF
SMA cables out to the rack. I'm powering |
|
|
331
|
Fri Feb 22 08:29:07 2008 |
Alberto | Update | Electronics | RF Monitor (StocMon) | [quote]I put the amplifiers next to the monitor
on the PSL table, layed the power and the
RF SMA cables out to the rack. I'm powering |
|
|
332
|
Fri Feb 22 08:33:18 2008 |
Alberto | Update | Electronics | RF Monitor (StocMon) | [quote]I put the amplifiers next to the monitor
on the PSL table, layed the power and the
RF SMA cables out to the rack. I'm powering |
|
|
334
|
Fri Feb 22 11:13:15 2008 |
rob | Update | Electronics | RF Monitor (StocMon) | [quote] It took some times because the written
procedure to start the chiller is not very
precise.[/quote]
|
|
|
347
|
Thu Feb 28 19:49:21 2008 |
rob | Update | Electronics | RF Monitor (StocMon) |
[quote]
With Ben, we hooked up the RF Monitor box |
|
|
246
|
Thu Jan 17 18:22:14 2008 |
Alberto | Update | Electronics | RF Monitor Band-pass Filter | After we finalized the schematic for the RF
monitor board based on buffered LC resonators,
on Richard Abbott's suggestion to avoid the |
|
|
248
|
Fri Jan 18 11:53:50 2008 |
Alberto | Update | Electronics | RF Monitor Band-pass Filter | The response is asymmetric and on the left
side of the peak, we have at least 33dB within
33Mhz, which is enough for all the frequencies. |
|
|
10152
|
Tue Jul 8 15:07:24 2014 |
Nichin | HowTo | Electronics | RF Multiplexer in rack 1Y1 | The RF
multiplexer is configured as shown in the
figure. It is now effectively a 15x1 RF mux. |
|