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Looks useful. Have you used it with nanoVNA tests? Kind regards Ed, G8FAX

Thanks, but sc-hub.se is blocked in UK, so no access.

Hello - Totally new to VNA here... I want to measure the characteristic impedance of 120 ohm shielded twisted pair wire. I know that you can measure it for 50 ohm coax using the NanoVNA but I wondered

Long enough for the synthesizers to stabilize, then capture ADC samples of the 5kHz output from the mixer for the receivers. A few milliseconds. Sure, it's pulsed, but the reason I describe it as CW

Coilcraft SWB2010-PCL. 50 kHz to 100 MHz, 1:1 with secondary CT, 6-pin DIP., $4.54 each from Mouser. Note link to datasheet.

Sorry, my mistake. How long does the CW signal last, at 101 measurement points? I thought that length would be called a pulse. (In my Air Force AC&W radar technician days, a 6 millisecond transmission

THANKS!!!

https://sci-hub.se/10.1109/TMTT.1983.1131612

Rather than cutting the cable, you should calibrate with the cable attached to the nanovna, attaching the calibration standards at the other end of the cable, using connector adapters if necessary.

For those looking for papers: R. L. Jesch, "Repeatability of SMA coaxial connectors," in IEEE Transactions on Instrumentation and Measurement, vol. IM-25, no. 4, pp. 314-320, Dec. 1976, doi:

Yes, a LARGE POWER attenuator (or several seriesed) Dave - W ?LEV siegfried.jackstien@...> wrote:

and if you want to keep the coax off then use sma to bnc and bnc to banana direct dg9bfc sigi ps nicely build with those pcb as open short load :-) i made a similar thingy for my capacitance/

with a 60 db attenuator inline you could measure a 60 db amplifier ... but in priciple you are right ... not really built for used inline after a rig ... but inline after an amp (with proper

Cool. Here's a screenshot with only S21 on the lower left graph. 73 Stan KM4HQE

Hello Siegfried, Thanks for your response. So If I cut more of my cable could I reduce the number of circles (the phase shift)?. I struggle to correct the delay with a lot of circles. Best regards.

500 mate/demate cycles is typical spec sheet number, but I'd say that there are plenty of SMAs that have seen a lot more cycles and are just fine, as long as they're not bent or damaged. There's a

My understanding is that SMA connectors were originally designed for interconnections inside equipment which are usually installed and then not touched, so that the limited durability was not a

Your filter looks fine, no funny stuff in the response. You might try expanding the scale of the S21 trace downwards to see how far down you can see the harmonic attenuation. 73, Don N2VGU

thanks

Try cutting double or single sided FR-4 board to the required shapes. Also, useful thicknesses of small copper sheets are available at Ace Hardware (and likely other outlets). Keep in mind that these