开云体育

And check the connectors, not the markings on the cable. I have seen 75 ohm coax jumpers with 50 ohm BNC connectors on the ends. Such cables are not recommended if you are using a resonant antenna,

On Mon, Dec 9, 2019 at 09:33 AM, QRP RX wrote: "Just use menu STIMULUS and set STOP = 30 MHZ. After that perform calibration and save to memory cell 0. Thats it. Now it will works to max 30 MHz with

Just use menu STIMULUS and set STOP = 30 MHZ. After that perform calibration and save to memory cell 0. Thats it. Now it will works to max 30 MHz with no harmonics mode.

@ Gary O'Neil, N3GO - 9 December 2019 /g/nanovna-users/message/8059 Dear Gary, No, there is not only the numeral two. There are a lot of ones and small Ls. But, could you wait a

Hello pgc1682, Thank you very much for your help with SimSmith. Unfortunately I cannot follow your explanation. I have loaded my data file nanoVNA_RG173-30cm_202_500MHz_Open.s1p in SimSmith, see

I would not say the matching is poor on port 2. I measured it using my HP VNA. At least on the NanoVNA sample I have, the return loss on port 2 is better than the specification on my HP 8720D VNA. I

Why not just calibrate for the frequencies you care about and save as your default? It doesn't seem like a custom firmware is needed to only see a segment you want. Since it is less than 300mhz, you

Hi Erik Fantastic ... I did not know you was maintaining TAPR VNA (or I had forgotten it) Looking forward to follow your project. My transfer switch is also Sivers Lab but only PM7551 ? with a

Two questions to answer: 1: Is there anything you can improve for HF by removing/adding it from the current firmware of the nanoVNA? The only thing I can think of is to force the SI5351 to always use

GIN&PEZ; You are in excellent company. The Romans thought they could avert the zero issue altogether by not using it at all. They must have realized that the number 1 was going to be a problem when

The NanoVNA, and most VNA's in general, use the fact they know their transmitted excitation frequency and its harmonics to pick out the desired receive signal to simplify the circuitry. The RF

If there an improvement in significant performance, yes. However I expect it is a combo of hardware and firmware dedicated to HF that would be required to achieve that goal. Alan

No, negligible firmware is specific to those constraints.

Since I am only interested in RF from 30MHz and below, would it be worthwhile to make a firmware that didn't support harmonics and limited the VCO to <30MHz? Thanks

RE: "First BNC up to 3ghz is a reliable connector, no different from TNC. Caveat; use good stuff and make sure you do not interchange 50 ohm BNC with 75 ohm BNC, really they are different!" Yes they

Hi Kurt. Thanks. This is the switch I bought: SIVERS LAB PHILIPS COAXIAL SWITCH 28V DC-18Ghz PM7553 Isolation below 1GHz is better than 80dB so I guess below 300MHz good enough. As I am currently the

Hi Erik Using the transfer switch is just a lazy method to swap the direction of the DUT. Actually dependent of the transfer switch quality you bought you make get poorer isolation between port 1 and

NanoVNA has receiver, but it cannot digitize receiver output with enough bandwidth to listen AM or SSB radio. You can try to connect your PC soundcard to SA602 outputs and use HDSDR to listen radio,

Hi Erik Just one more practical comment. Whatever you do the single forward and the single reverse measurement s1p files does not carry any information about the port mismatch to take into account for

Yes, CH1 is a receiver that looks for signals at the frequency (or harmonic) of CH0. Keep in mind that nanoVNA steps, rather than sweeps, so that if set for a wide span will probably miss a narrow