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I'm ordering a few electronic parts. Please add to this list if there's more I should pick up from DigiKey for EE. 

Also came in today to look for connectors, heat pads, heat sinks, box, etc for putting PSOMA's fiber optics in a box (+ EOM RF / DC bias).

• socket receptacle with size specification similar to EOM datasheet. (ED10650-02-ND‎)
• AAA battery holders (‎HM5212-ND‎, ‎HM5218-ND‎, ‎HM5214-ND‎)
• Nickel metal hydride AA batteries (N730-ND‎)

The following books were added to the EE shop. Do not take them without first returning them.

• Morrison, Grounding and Shielding Tehcniques, 4th Edition
• Hobbs, Building electro-optical systems: making it all work, 2nd edition

Building Scientific Apparatus by Moore. Loan sheet

Reply to this entry to update the loan status/location

Fundamentals of Interferometric Gravitational Wave Detectors (2nd ed.) by Peter R. Saulson. Loan sheet

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I'm borrowing this: Fundamentals of Interferometric Gravitational Wave Detectors (2nd ed.) by Saulson

Grounding and Shielding Techniques by Morrision. Loan sheet

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Adding a QR code for this elog entry.

Reply from my phone. 

I took 12 soldercup DB9 connectors from the EE shop for use in 40m. Here is the link of what we took:|
https://www.digikey.com/en/products/detail/hirose-electric-co-ltd/HDEB-9S-05/5148584?s=N4IgTCBcDaIBIEYxgGwE4wFoByAREAugL5A

There are still 5-10 connectors left but this should be restocked soon. The above item is not in stock at digikey so an appropriate replacement should be chosen.

I replaced the Laser Warning light for Cryo lab with a LED bulb, rather than the existing CFLs. There is a pack of such replacement bulbs now in the big grey cabinet in the EE lab.

Chub dropped off a repaired Marconi 2023A signal generator, which I'm phase locking to a function generator to test out how it will go in my three corner hat measurement. Perhaps I could synchronize between the Moku phasemeter frequency estimate (of f_13, f_23) and Marconi frequency estimate (f_12) offline by introducing a time offset to f_12 and maximizing the correlation with f_13 and f_23?

Here's what I did. See attachment 1 for configuration. 

1. Set the function generator for 27.1828 MHz sine at 0 dBm, to simulate my beat note signal
2. Select an appropriate mixer and low pass filter. I have a BNC connected LP at 11 MHz that will work, and use a mixer that's for 0.1-500 MHz.
3. Set the Marconi carrier to a few kHz away from the function generator (27.18 MHz) and 10 dBm RF power (so 7 dBm gets to my mixer after monitoring half the power)
4. Use externally driven frequency modulation with DC coupling. With no amplifier in the loop, I found the loop is stable up to the maximum 200 kHz/Vrms frequency deviation (modulation depth). With an SR560 and G=100, the PLL locked at 5 kHz/Vrms and was stable up to 11-12 kHz/Vrms.
5. The LF output on the Marconi is the frequency noise of the RF signal (for example, from the function generator) in units of the FM deviation. 

I measured the current noise of our Thorlabs ITC502 laser driver today.

While in EE, I

• started to make a box to hold a low temperature coefficient resistor and some connectors for low frequency current sensing
• Noticed we are low on AA batteries (I found 1), and while we have AA and 9V battery holders, we don't have the AAA variety. I started a digikey order, and will ask around for more that's needed in EE.