Re: HI-Z EVALUATUTION - MEASURED DATA COMPARISON with HP 8753C
Nels, I should have said Hi-Z broadband transmission lines. Of course the tube amp situation is as Dave stated. I went to https://hamwaves.com/zc.circular/en/index.html to calculate the spacing for
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W1RS
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#11034
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Anyone had news from Maggie King?
I ordered a Nanovna H4 from alibaba begenning of the month, she told me it would ship before the 15, but did not had any news since. Am I the only one?
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Pierre Martel <petem001@...>
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#11033
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Re: Jog wheel switch causes problems
#parts
It's not just the Jog Switch it's also the way it is polled by the software. Replacing the jog switch with push buttons improves the operation, mainly because at least you can feel the positive click
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Martin
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#11032
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Re: SWR trace always showing 1:1 as flat line at bottom of screen
I am no longer in front of the device, but I am pretty sure there was CH0 preceding all 3 of the active trace readouts (RL, SWR and Smith). Is there anything else that could have prevented the SWR
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nanovnagroup@...
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#11031
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Re: Jog wheel switch causes problems
#parts
Some jog switches are of poor quality but you can determine if it's the firmware by flashing a different developer's version other than edy555 FW.Flash QRP's firmware - he does not have the marker
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Larry Rothman
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#11030
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Re: Jog wheel switch causes problems
#parts
I think now, after reading posts about this same problem, that it is not the switch which causes problems, it is the jog wheel itself working illogically (in my opinion, that is)
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Leif M
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#11029
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Re: connectors grounding
If you have some spare fibreglass (FR4 PCB material or even an old PC board (strip the parts)) just create a small bracket to hold the SMA connectors in place.Cut, drill and slide the bracket over the
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Larry Rothman
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#11028
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Re: nanoVNA Maximum Impedance Measurement (Folded Dipole example)
I've measured an 9.8k Ohm small THD resistor, using direct measurement on CH0, and also the S21 method proposed by G3TXQ for measuring chokes: http://www.karinya.net/g3txq/chokes/#measurement [image:
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Ady, YO2NAA
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#11027
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Re: SWR trace always showing 1:1 as flat line at bottom of screen
1) be sure that the TRACE selected for SWR is using CHANNEL CH0 2) in SCALE, select whatever REFERENCE POSITION that you like eg 1 x1 3) select an appropriate SCALE->SCALE/DIV e.g. .2 x1 for 100 Ohm
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Oristo
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#11026
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Re: nanoVNA Maximum Impedance Measurement (Folded Dipole example)
Regarding the external bridge, I've asked Rune, the author of NanoVNA-saver to add external bridge support. https://github.com/mihtjel/nanovna-saver/issues/122 NanoVNA-saver is already an amazing
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Ady, YO2NAA
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#11025
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SWR trace always showing 1:1 as flat line at bottom of screen
Hi, I Ham friend of mine ordered a NavoVNA and he asked me to come over and help him understand how to check the SWR of his antennas. I am not yet very familiar with all the operational procedures of
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nanovnagroup@...
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#11024
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Re: connectors grounding
On Mon, Feb 17, 2020 at 05:41 PM, <nanovnauser@...> wrote: well looking at the link to owen duffys solution it looks like the ground is common to both connectors then?,cheers all 73
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hwalker
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#11023
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Re: Jog wheel switch causes problems
#parts
Folks, Always read the release notes for the version and development release of firmware you've flashed your device with. In this case, edy555 documented the jog switch changes at this link:
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Larry Rothman
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#11022
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Re: connectors grounding
well looking at the link to owen duffys solution it looks like the ground is common to both connectors then?,cheers all 73
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Paul M3VUV
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#11021
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Re: connectors grounding
i think you missunderstand me,on nano the pcb it looks like the body of the sma connectors ie the ground are not electricaly conected to each other,thats what im' trying to find out.ie is is important
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Paul M3VUV
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#11020
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Re: Jog wheel switch causes problems
#parts
On Mon, Feb 17, 2020 at 03:41 PM, Oristo wrote: My understanding was the the jog switch affects whatever was most recently selected in menus. For example, if marker 2 is selected, then jog switch
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hwalker
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#11019
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Re: Jog wheel switch causes problems
#parts
My understanding was the the jog switch affects whatever was most recently selected in menus. For example, if marker 2 is selected, then jog switch would move marker 2. Then, if stimulus->start is
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Oristo
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#11018
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Re: HI-Z EVALUATUTION - MEASURED DATA COMPARISON with HP 8753C
Here is another similar set of data: http://www.janbob.com/electron/466R2VNA.gif I think it supports Dave's general conclusion for resistors like 470 Ohms. This was done with a HP8714B VNA that is
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Bob Larkin
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#11017
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Re: connectors grounding
Shields must be connected as should the center conductors of any cable extenders. Highly flexible cables are a good method to embody a connector saver. Be fure to use good quality cables and
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W0LEV
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#11016
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Re: connectors grounding
You may want to look at the elegant solution that Owen Duffy built at: https://owenduffy.net/blog/?p=16707 Dale W4OP
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Dale Parfitt
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#11015
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