The 40m Upgrade Frequency Generation Box is going to be installed in the 1Y1 rack. It will be used to generate the modulation and the demodulation frequencies.

Contents

Some Thoughts in Early Days
1. List of things to do

Pictures

This is the first picture as I start putting it together.
attachment:pic_RFgenbox.jpg

Things to do

schedule

get parts
cut 5 3x3" copper sheets

Powering

Element	DC In	Max Amp In
5x multiplier	+15	0.200
ZFL-1HADX Ampl	+15	0.115
voltage contr'd att. 1	+15	0.020
voltage contr'd att. 2	+15	0.020
11 MHz oscillator	+15	0.330
29.5 MHz oscillator	+15	0.330
Total 15V		1.015
ZHL-2X-S 1	+24	0.600
ZHL-2X-S 2	+24	0.600
ZHL-2X-S 3	+24	0.600
Total 24V		1.800

Parts

Assembling Parts

Part	Function	Description	Provider	SN	Q.ty	Status
Teflon sheet	base mounting plate	12"x24"x3/8"	[http://www.mcmaster.com/# McMaster]	8545K37	2
stainless steel spacers	plate support	1/4" OD, 3/8" Length, 8-32	[http://www.mcmaster.com/# McMaster]	91125A453	20
LIGO std power connector	power feed thru	4-pin	Downs lab	drill room bin 108/6	2
clamps	holding component on plate	[attachment:bracket.png drawing]	Mike	-	12	cancelled
terminal blocks	power distribution	6-holes	McMaster	7527K46	6
terminal blocks	power distribution	4-holes	McMaster	7527K44	4
spade terminals	power distribution	16-14 wire	McMaster	69145K436	1 pkg (100pcs)
spade terminals	power distribution	12-10 wire	McMaster	69145K438	1 pkg (100pcs)
jumpers	to terminal blocks	-	McMaster	7527K59	1 pkg (25pcs)
screws	frequency multiplier	2-56, 1/2"	McMaster	95345A018	1 pkg (50pcs)
screws	frequency multiplier	2-56, 5/8"	McMaster	95345A019	1 pkg (50pcs)
screw kit	-	Flat, Phillips, 4-40, 6-32, 8-32, 10-24, 10-32	McMaster	91815A224	1 kit (1200pcs)
screw kit	-	Pan, Phillips, 4-40, 6-32, 8-32, 10-24, 10-32	McMaster	93175A212	1 kit (1200pcs)
nut assortment	-	Machine Screw Hex Nut Assortments	McMaster	90625A207	1 kit
washer kit	-	12 sizes	McMaster	92075A212	1kit (1680pcs)

RF Components

Part	Provider	SN	Q.ty	Status
Power Splitter	Digi Key	ZFRSC-42+	4	ordered

Powering

[http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=A33740-ND Bulkhead Mounted CPC Connector]

attachment:CPCpowerConnector.jpg

DC Voltage Input

Dsub connector, 9pin, female socket.

[http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=A32510-ND DigiKey: A32510-ND]

Front and Back Panels

[attachment:Visio-RFfrequencyBoxMechanics.pdf Front and back panel prototype designs]

Front and Back Panels files for FrontPanelExpress 4.02.

[attachment:frequencyGenerationBox_BackPanel.fpd Back Panel]

[attachment:frequencyGenerationBox_FrontPanel.fpd Front Panel]

Links

[http://www.ligo.caltech.edu/~costheld/ Chub's Web Page with lots of electronics diagrams and pictures]

Some Thoughts in Early Days

This box will be made from a [https://dcc.ligo.org/DocDB/0000/D070013/002/LIGO-D070013-v2.pdf Metalcraft 2U chassis].
[http://ilog.ligo-wa.caltech.edu:7285/advligo/RfDistributionAmplifier This] is an inspirational model.
The box will contain a crystal oscillator to generate the 11 MHz sideband. From that a frequency multiplier will provide the 55MHz modulation.

It will be possible to opt between an external source of the 11MHz modulation rather than the internal oscillator.

The box will also provide the signals for the demodulation at the LSC rack.
The amplitude of the modulation signals going to the EOM will be tunable by means of two mechanical knob-attenuators and by Voltage Controlled Attenuators (VCA).
The front panel will have the following inputs:
- 11 MHz
- 11MHz VCA
- 55MHz VCA
This will be the outputs in the front panel:
- 11 MHz to the EOM
- 11 MHz to the LSC
- 55 MHz to the EOM
- 55 MHz to the LSC
the front panel will also host knobs of the two attenuators.

List of things to do

Construction of Frequency Generation Box
1. coax cables order (1hr): measure lengths, compile list, give list to Steve
2. protection capacitors (1hr): design, ordering/stealing from Downs
3. cooling system installation (1/2 day)
  - cutting mica board, drill board, drill back panel, drill holes for cooling fins, install cooling fins, install LNVRs
4. external powering (1/2 day)
  - drill main hole and screw holes for D-connector, get D-connector pins from Downs, connect metal pins to connector, drill screw holes for the power terminal block on the right end side; drill hole for power switch; get poer switches from wilson house; connect power switches to terminal block
5. power cables routing (1/2 day)
  - connect cables from the D-connector's pins to the power terminal block, interconnect the ground of the LNVRs, solder the LNVRs ground connections, connect power capacitors,
6. front and back panel design (2hr)
Characterization
1. prepare check list
2. write a LIGO technical document
3. signal amplitude measurement: amplitude at the EOM outputs and at the demod outputs
4. phase noise measurement: 11MHz output and 55MHz output
Frequency Box Installation
1. connection to the rack power
2. cable connections