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Roger, Thanks for the idea. I already tried sending them an email a while ago for that exact request ! The phone is still ringing, nobody answered yet at the other end ;( But I should throw the

The RF switch is damaged and can be restored by replacing the MXD8641.

Good point on the upper frequency limit of home brew (and some professional) fixtures. My home brew fixture which uses alligator clips instead of binding posts has an upper limit of 100 MHz. I

The inductance you measure at the operating frequency is the value that influences the circuit. Some people reserve the word inductance for the value an inductor exhibits at low frequencies where

I posted about my binding post and PCB OSL a few years ago. For best results you need to keep the slit in the middle as wide as possible and the same for all 3 boards. You also need to connect the

Something is wrong. NOTHING should show outside of the Smith Chart for S11, the green trace after a proper calibration is completed! While the following has been mentioned many times: 1) Did you

for just a few nanohenry you need to make your calibration very exact ... i would not try to exactly finetune it ... i would see if i am close .. then build my filter and tune the filter with all

you would need a choke below the transformer to decouple the shield of the coax being part of the antenna (and then it would still couple a bit to the antenna cause all couples with all in an indoor

Hello, new to this group. I've learned a lot from reading here, but i seem to have run into some issues and could use some advice. I'm building a low pass filter, and trying to learn to measure

The transformer does not decouple the nanovna and PC/laptop and, therefore, anything conductive within the house from the measurement. If you used only the NANOVNA connected to NOTHING, not even

Roger, Thanks for confirming my suspicion...I guess this also implies that the WSPR spot counts/pattern might also be different between the two configurations, since the shield/chassis would be

Bruce, Your plots will be different because the common mode current (and therefore feedline radiation) will be different. Your friend is using a transformer as a voltage balun. With a good current

(forgot to attach these two SWR plots to the previous post)

A ham friend has an unusual indoor antenna that he uses with a Zachtek WSPR transmitter. He gets lots of spots from the 200mW transmitter (>500 unique band/spotter combinations in 24 hours), and the

Nico, After reviewing the data sheet that you posted earlier I see that Linx does offer customer support for this antenna. They state that they can supply PCB layout files and recommend matching

This is what it looks like when I reset the calibration.

Can you send an uncalibrated image?

I confirmed that short/open/load standards are measuring as they should at the terminals on the pcb board.

I bought the unit from R&L on Oct. 31, 2024. I did an ohm reading between blocking capacitor on the circuit side CH0 port terminal and ground, as described in this blog post

If you buy from RANDL, we can provide you with after-sales service. But since we have discontinued the SAA2N for a long time, RANDL may not have the stock to replace it for you. This is usually caused