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Re: updated and calibrated nanovna h4 yields incorrect swr readings
Not me, but..... Pasternack is a good supplier, although a bit pricey. https://www.pasternack.com/ I believe DigiKey also carries their products. Dave - W?LEV
By W0LEV · #34038 ·
Re: updated and calibrated nanovna h4 yields incorrect swr readings
Hello Stan, What model, manufacurer and from what supplier did you obtain the quality sma coax cables? Thanks. Al
By Allan Johnston · #34037 ·
Re: updated and calibrated nanovna h4 yields incorrect swr readings
Glad you found the problem. These cables have been problematic from day one. I've even had a few with the NANOVNAs. Even a few bad USB cables. Dsve - W?LEV
By W0LEV · #34036 ·
Re: updated and calibrated nanovna h4 yields incorrect swr readings
It is not uncommon for the sma-terminated pigtail cables that come with the nanovna to fail, or to not have been assembled well. Sometimes the shield is not soldered at the connector, so it passes
By Stan Dye · #34035 ·
Re: updated and calibrated nanovna h4 yields incorrect swr readings
Dave, W0LEV, It's looking like an intermittent good then bad connection with the NanoVNA. The nanovna is connected with the unit's supplied connectors/coax and additional connector as needed for the
By Allan Johnston · #34034 ·
Re: Nano VNA of a modified 40m hor loop NVIS antenna
Thank you for the reply. I¡¯m a long time NVIS emcomm loop user but I just moved and purchased the H4 to build a new loop for 80 and another for 40. I¡¯ve had excellent success using the 10KW common
By JJ Knight · #34033 ·
Re: updated and calibrated nanovna h4 yields incorrect swr readings
How are you connecting the NANOVNA? Identical to the method used for the RigExpert? Where does the trace show on the Smith Chart of the NANOVNA? Is the trace consistent with the SWR indication? Once
By W0LEV · #34032 ·
updated and calibrated nanovna h4 yields incorrect swr readings
The Nanovna h4 in use was purchased from R&L Electronics a year or so ago. Last month I updated the software. The Nanovna has never given me "good" results as compared to a RigExpert AA 650 zoom when
By Allan Johnston · #34031 ·
Re: Nano VNA of a modified 40m hor loop NVIS antenna
40-meters between your target times of 1000 to 1400 local will be problematic if the fof2 is not at or above 7-MHz. Here in N. Colorado, of late, it has been, but over the last couple of years during
By W0LEV · #34030 ·
Re: Nano VNA of a modified 40m hor loop NVIS antenna
Ok... with a capacitor, inductor, capacitor + inducteur you can do a fixed two band matching network :) Thank -- F1AMM Fran?ois
By Fran?ois · #34029 ·
Re: Nano VNA of a modified 40m hor loop NVIS antenna
I have almost the same antenna as you. Over 40 m no station arrives harder than on my trap doublet at 12 m height. In general, a station arrives between -6dB and -10dB on the loop than on the doublet.
By Fran?ois · #34028 ·
Re: Nano VNA of a modified 40m hor loop NVIS antenna
Capacitor,inductor,capacitor
By Jim Lux · #34027 ·
Re: Nano VNA of a modified 40m hor loop NVIS antenna
Please wat is a "CLC tuner" ? -- F1AMM Fran?ois
By Fran?ois · #34026 ·
Re: Nano VNA of a modified 40m hor loop NVIS antenna
JJ Night To answer your question¡­ There is nothing special about this antenna, other than it is a closed LOOP of 140 ft heavy wire #10 because I had a few hundred feet of this wire. I wanted good
By Barry K3EUI · #34025 ·
Re: NanoVNA-APP chart options question
Hi Mark, Roger, For NanoVNA-App (DiSlord version) these informations are calculated, but not plotted. They are displayed on the Info Panel (info button must be turned on), right side at the lower
By F6EGK - Jean-Roger · #34024 ·
Re: Nano VNA of a modified 40m hor loop NVIS antenna
You can¡¯t go wrong with a loop. Would you walk me through how you went about testing it and tuning it? I have to build a new one myself and I¡¯m curious how you connected it to your vna. JJ Knight
By JJ Knight · #34023 ·
Re: Not available at Ali Express / Zeenko
Anyone with basic IT expertise will tell you the same. <ve3fh@...> wrote:
By Dragan Milivojevic · #34022 ·
Re: NanoVNA-APP chart options question
NanoVNA app does not calculate/plot S21 impedance measurements. BTW S21 impedance measurements are not very accurate using NanoVNA's because they do not do 12 point error calibration and do not have
By Roger Need · #34021 ·
Re: Not available at Ali Express / Zeenko
ae1th@, you mention this is the case with gift cards... I can see that as being a policy. Gift cards, while being great options, they have no real tracking ability especially on the internet. Many
By Mark KQ4EKK <kq4ekk+groups@...> · #34020 ·
Nano VNA of a modified 40m hor loop NVIS antenna
How are folks doing on a 40m NVIS antenna for daytime short-range COMS? A bit more tweaking of my 40m closed LOOP NVIS antenna for 7075 kHz Less than 1.5:1 SWR across 40m band Over 50dB return loss at
By Barry K3EUI · #34019 ·