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Re: ? nanovna-saver best fw ?
#nanovna-saver
The nanovna saver is not currently being developed
because of the busy programmer. Latest Version: 0.2.2.1 (Python 0.2.2) The 2.8-inch core nanovna edy555 version 0.7.1-20200321, while the Hugen version is 0.4.5-4. beware, because here you can find the version of -H4 you need -H Otherwise, check out the Wiki folder. |
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? nanovna-saver best fw ?
#nanovna-saver
Hi everyone,
From all the firmware versions for the nanovna-H (original) what firmware do you recomend to take the most from the nanovna-saver? Or, is the nanovna-saver agnostic to fw version? Cheers and thanks |
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Re: Check impedance of an unknown coaxial cable
Howdy Pablo! This virus should has thrown the world into turmoil... I hope it turns out to be a minor virus, not as bad as the flu.
As far as coax for antenna for an H/T, I would assume around 145 MHz and/or 445 MHz for ham bands? I use a good quality RG-6 for my scanners. This is of course adding in a 1.5:1 SWR but due to being used receive only, it's of little consequence. I have 800 MHz trunking systems I monitor as well as low band VHF (45 MHz) and the coax I swept is pretty wide band and low loss. I have multiple scanners so I use a small CATV distribution amplifier. Each port is 7 db gain so it compensates for coax losses. I have under 20 meters going to a discone antenna. The amp does provide a bias-t function so i could use an LNA at the antenna....the one I have is 17 db gain but I don't need it. My scanners all have BNC antenna connectors so I use a BNC-F adapter and then about .7 meter pigtails of RG-6 from the amp to the receivers. It all appears to work well. Food for thought or maybe excess information.... 73 de Tim, K4SHF |
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Re: Analysing Input Impedance Matching Circuit for the NE602
Hi Roger,
Thanks for this, your results look very similar to mine, there is a slight difference in the frequency of the dips but I assume this is due to differences in the mix of the core material, winding pattern (causing a difference of capacitance between turns) and also stray capacitance and inductance on connecting wires. The images below show my results of two back to back 1T to 8T impedance transformers using BN73-202 binocular cores with plastic insulated wires compared to yours (mine look just like the ones in the photo you attached, they are wound in exactly the same way). I have added your images next to my results for comparison, mine are the left ones and yours are the right ones. I am pleased my results match so closely to yours - it is always helpful to be able to compare results. Thanks for taking the time do do this. |
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Re: Analysing Input Impedance Matching Circuit for the NE602
Kerr,
I wound two 1T to 8T impedance transformers using BN73-202 binocular cores and insulated, solid, silver-plated wire-wrap wire. They were connected back to back and the 1T sides soldered to SMA connectors as shown below. NanoVNA Saver was used to make the measurements from 1 MHz. to 30 MHz (plots below). The worst case S21 loss was 5.9 dB at 30 MHz. (back-back) which is about 3 dB for one transformer. In the 40M band the S21 was -2.69 dB (back-back) or -1.35 dB for one transformer which is quite good. Return loss (S11) varied from 12 dB to 3.71 dB across the 30 MHz. test range. There is enough room in the core holes to wind 2T to 16T but I have not done this yet. |
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Check impedance of an unknown coaxial cable
Hi guys and greeting from Buenos Aires, Argentina. We're in full country quarantine since thursday, I was planning on buying some cable, but our govt acted so fast that I had no time, so I'm stuck at home with a couple of rolls of coaxial cable and wanting to improve my external antenna for my HT.
Have a Hugen VNA with Eddy 0.7 firmware but still don't trully know how to use it besides basic stuff. They are probably 75ohm but from photos I found on the web some may actually be rg58, can you guys tell me how to use nanoVNA to know the cable impedance? Thanks |
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Re: edy555 release 0.7.1-20200321
#firmware
Gyula wrote:
You will then need to use the ST-LINK utility with the following memoryGuyla, correct, no need to convert to .dfu, but dfu-util can update with the ch.bin file. It is not necessary to install STLink (at least in 10.14.6), but is there some other benefit to installing it? BTW, since Homebrew was originally used to install dfu-util, I could install STLink like this: brew install stlink -- I_B_Nbridgema |
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Re: V2 Design
#nanovna-v2
Hi Herb
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At least the Danish postal service has been notified 12 days ago, and it is just a matter of being patient ? -----Oprindelig meddelelse----- Fra: [email protected] <[email protected]> P? vegne af hwalker Sendt: 22. marts 2020 21:37 Til: [email protected] Emne: Re: [nanovna-users] V2 Design #NanoVNA-V2 On Sun, Mar 22, 2020 at 12:33 PM, Kurt Poulsen wrote:
.. As soon my SAA-2 arrives (I ordered it on the very first day it was offered by Tindie, and it has left sender country on the way to me) ======================================================== Kurt, I'm sure group member's looking to make an informed purchase decision, be it a NanoVNA (-H, -H4, -F) or whatever, look forward to getting some credible S-A-A-2 reviews from knowledge user's. I was hoping to erik would provide a review of the unit he received before the Coronavirus mucked up the distribution chain, but I think he been too busy modifying his TAPR software to work with the S-A-A-2 and developing other RF projects. I think one person in Russia has recently reported receiving his order on this group, but no feedback has been provided - so far. Hopefully your delivery won't be far behind and with all the prior data that you have from the NanoVNA and DG8SAQ/VNWA, your prospective will carry a lot of weight. - Herb |
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Re: V2 Design
#nanovna-v2
Hi Herb and others
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As soon my SAA-2 arrives (I ordered it on the very first day it was offered by Tindie, and it has left sender country on the way to me) I will issue relevant data for the SDR-Kits of female Rosenberger parts. I have measurements to 8GHz for these part derived from a 4 port brand new R&S VNA. These data are stable for short open and thru adaptor and for the load there is minor differences for the shunt C. The R values for the load are measured individually by SDR- Kit with a 4 wire measuring test equipment against a 0.01% 50 ohm resistor. I will also issue a general document how to fine tune this shunt C by a sweep of a rigid cable based on a reference s1p Touchstone file generated by SimSmith and same open rigid line used to test a sweep round the Smitchart, to see if the average shunt C in the files provided already is OK. I might also provide data for a male kit, time will show I expect this to be successful ? Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] <[email protected]> P? vegne af hwalker Sendt: 22. marts 2020 17:49 Til: [email protected] Emne: Re: [nanovna-users] V2 Design #NanoVNA-V2 On Sun, Mar 22, 2020 at 07:42 AM, David Feldman wrote:
... Battery (size per the hcxqsgroup page) and pigtail cable (type per the hcxqsgroup page) were ordered separately from domestic suppliers .. ============================================== Dave, More important than battery and the cables are the OSL standards. A VNA without accurate standards is like a computer without software -- pretty to look at but limited in use. Since you purchased the S-A-A-2, I assume you intend on using it to 3 GHz. In that case, you should look into the purchase of a quality OSL kit rated to 3 GHz or better. Coaxial adapters rated to 3 GHz are more expensive than those used for the NanoVNA. If you already have a NanoVNA you can use its standards and adapters, but don't expect great performance much past 1.5 GHz. I haven't found a user review of the S-A-A-2 yet, so I can't say if it is delivered fully calibrated (50k - 3 GHz, 201 pts). If it is delivered not calibrated, or calibrated at less than its full range, then that makes the availability of an OSL kit even more important. Looking forward to you receiving your V2 and providing a review to the group. - Herb |
Gyula Molnar
CT2FZI
Tim K4SHF
Roger Need
Arie Kleingeld PA3A
Jim Allyn - N7JA
Pablo E. Untroib
Nbridgema
Kurt Poulsen