LeCroy PP092 2Gs/sec adapter

[sprok]

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[iopq]

Yes. I know the language poorly and has to use a translator .
I stuck to this tape , put in 5 -pin (+12, SDA, SCL, GND, Sense). then filled with epoxy resin pins and wait for solidification . further polished using a Dremel hand . CAT24C08 memory used by Apple iPhone 5S (U6). on top of all the filled ultraviolet glue.

[sprok]

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[robert_]

solidly clamp the PCB and then use a soldering iron with a really wide tip as to heat all of the pads (and use enough fresh solder) at once and then pull off the connector.
Worked fine for me.

[sprok]

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[robert_]

It worked for me with heating for maybe 5 seconds before it could be pulled off with some force. Used a JBC iron with a wide tip, set to 370°C or so.
The BNC insulator is PTFE so will tolerate some heat, the ground pins are solid enough to withstand some force (sideways, not up/down) if needed, as long as the center pin has all its solder liquid.
I have disassembled an PP092 to build an adaptor for a Tek high voltage diff probe, and a copy of the (really expensive) CA10 current sensor adaptor. Probably going to post it here once i get my boards.

[sprok]

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[Someone]

Anyone know a source for those male push-on quick BNC edge-mount connectors? I can't find a single source anywhere! The female one is easy.

The "best" source I could find was ebay, they don't have board edge connectors specifically but the through hole design can be bodged, or design a PCB around the PCB being in the mating plane of the connectors to match.

[azer]

Anybody have the eeprom dump and a possible picture of the PP096 adapter for the LC684 series?

[macboy]

I've had some more time to play with this. My original version exhibited significant attenuation above 420 MHz. This appears to be caused by inductance(?) in the leads between the resistors and connectors. Also, the Altoids tin itself is probably too big for these higher frequencies.

Using an antenna tester and 1% dummy loads on the adapter the SWR started at 2.5 at 420 MHz and quickly climbed to 5+ at 470 MHz. I tried all sorts of combinations of SMD, through-hole resistors, Wye, and Delta configurations, nothing made a difference. Finally I pushed the wiring to the bottom of the tin:


and put a hacked-up shield on top of the circuit (welded to the tin) as a proof of concept:


This improved the SWR to 1.5 at 420 MHz and under 3 at 470 MHz. On the oscilloscope this worked to keep the signal above -3 dB (that's a total of -9 dB for the whole circuit because you loose 6 dB just for the resistive splitter) all the way to 470 MHz. I don't currently have anything that can generate a signal above 470 MHz.

I'm not sure if I should try a PCB design with ground plane or maybe just stick the matching components inside copper tube. I would like to eventually be able to go to 700 MHz without too much attenuation.

I'd recommend positioning the resistive power divider - all of the resistors - right at the BNC input jack, then use a short piece of 50 ohm coax to connect to the two BNC outputs. The three resistors forming the power divider should be positioned as close together as possible, rather than directly on each connector. The AC impedance at each of the three input/outputs of the power divider star network is 50 ohms, but the impedance at the middle node is not 50 ohms. Keep that node as small as possible, and you will probably eliminate a lot of the issues you see.