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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

The NanoVNA DOES have a setting to display SWR. It just generates its own signal to measure it; it doesn't connect to a transmitter. The same with the RigExpert AA-600. It generates its own signal to

Any amateur radio operator using a NANOVNA (or even the TinySA) should absolutely know it's a low-power device and not fit for inline or terminating installation!!!!!!! It ain't no Bird

Good afternoon Dave, Do you know whether those copper blanks are available anywhere that can be bought? I have tried making some with not much success. Fred - N4CLA

The NANOVNA can be used directly at 300-ohm resistance. Careful calibrationn and placement of the cursor is required to ultimately read values is required, but can be accomplished without introducing

SMA connectors are for good two reasons: 1) Small size and 2) Frequency response. SMA connectors are bad for one reasonable consideration: Limited service lifetime for mates/demates. Banana

New users of the NanoVNA have many questions about their new piece of test equipment. They will find a lot of useful information and User Guides in the Files section of this group.

Typically, I use a BNC-dual banana jack and a SMA/BNC adapter. I don't know that anyone sells a SMA-Banana I've built them over the years. Usually, by cutting a SMA-SMA cable, splitting the coax and

In general yes. The miniVNA uses a different receiver design, and different ways of sampling the signals, but the basic concept is the same - look at reflected signal vs incident signal. Calibration

You can easily measure impedances up to several thousand ohms using the S11 (CH0 or Port1) shunt method if you have a decent test jig (see group wiki for details). The higher you go the worse the