开云体育

I am preparing to purchase my first antenna analyzer product. I have an old MFJ-209 which has neither meters nor frequency readout. I love to build antennas, especially for my ham club. Can any of you

Yes, no big changes from old 0.8.4.6 Add in calibration done fixes, not clear old calibration data if no measure it. Also for AIC disable ADC Volume Control Soft-Stepping (no soft volume up down after

Now I wonder: How do I extract the crystal equivalent model parameters with this fixture? Does anyone have a link to the measurement method explanation and perhaps associated software? Jose, CO2JA

Thank you Herb!

Hi DisLord, Same file/name as post /g/nanovna-users/message/13239 ? Cheers! <orginal message snip>

The original circuit from the service manual of the HP device.

Try understand why in range 250-300MHz and 1300-1500MHz exist not correct CH1 measure Also continue work under get better result on CH1 Now at -110dB on 1-100MHz less noise (see screenshot), also less

Hello, 3 screen-shots with not too bad results:(must say very good!) -1- No cable -2- One 20cm 50Ohms cable (from NanoVNA-H kit) -3- 2 times as above connected cables with SMA (from kit). Rudi

Hi John, Thank you very much for your message and explanations. It was effectively the impedance curve who was not clear for me; with your help, it's more clear now ! I will look today for your

On Sun, May 10, 2020 at 02:39 PM, CT2FZI wrote: From your findings, using 201 points what would be the best bw? Would it make sense to calibrate using a lower bw and for daily usage increase the bw

Hi Herb! From your findings, using 201 points what would be the best bw? Would it make sense to calibrate using a lower bw and for daily usage increase the bw for the same frequency range? Cheers and

Rudi, NanoSaver uses FFT methods to compute what would happen if you sent an impulse (sharp voltage spike) down the attached line. One trace represents the computed reflection of that impulse from

Hi Larry, Thank you for your kind message. I will use these information to find an answer to this 1st question and future too ! Best regards, Rudi

Your explanation agrees with my logic... There is a mistake in the drawing attached, the 33 pF capacitors appear marked 33 nF, not 33 pF. That?s it.

Hi Rudi, Welcome to the forum! Please use the WIKI and FILES sections - they contain a lot of good technical and practical information. Use the search function as well on forum messages - search the

Hi Herb Thank you for the schematic As alan victor mentioned in the next comment here, the test fixture is in not to recommend as a general test fixture designed for one specific frequency as the

Wouldn?t it rather be 33 pF, the standard parallell load for FT243 crystals? 73 de Jose, CO2JA PS: In russian 33 пФ is 33 pF... just in case...

Hello, Very pleased to be accepted in this group. My dumb 1st question: What is the 2 curves values i get when doing a TDR ? Coaxial length is correctly displayed (i'm very satisfied with the

Don't know anything about Hugen, but the GigaParts "-H" is a good one. Comes with all the accessories, including installed battery. $69 USD I think. *Bob Kircher, K7QXY* Tigard, OR (503) 789-3983

I use a crystal test fixture that I built for the Poor Ham Scalar Network Analyzer (PHSNA) and I used it very much with good success with the nanoVNA also. It consist on two 50 to 12,5 Ohm broadband