Hello Luis, You haven't taken in account your time, your hourly rate. If I did then it's cheaper for me to buy than to make. Not that it will be, I don't need them. Of course it varies but a lot of people think their time is worth zero, it isn't. Stay safe. Sunday, April 19, 2020, 11:38:16 AM, you wrote: C> Ok if you ask I will answer: C> Between my junk box and ordered parts I can make from scratch 3 units for C> under 3usd, with (3) different patterns. If not using junk box it would be C> 4usd for the 3. C> It's hard for me to pay for 2 of these board kits as it's already the price C> of half a nanovna itself, and if one considers the DIY price... C> Perhaps we have different points of view about DIY and the value of things C> (I value the money I earn a lot). C> Cheers and enjoy our lovely nanovna safely and in health. C> Kind regards, C> ³¢³Ü¨ª²õ C> A domingo, 19/04/2020, 04:37, Ben Yuen <benyuenkc@...> escreveu: I got two of this test board and made one of them. It worth the cost.
Why bother to do from scratch.
VR2XHQ
C> -- Best regards, John G8KVP mailto:john@...
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Ok if you ask I will answer:
Between my junk box and ordered parts I can make from scratch 3 units for
under 3usd, with (3) different patterns. If not using junk box it would be
4usd for the 3.
It's hard for me to pay for 2 of these board kits as it's already the price
of half a nanovna itself, and if one considers the DIY price...
Perhaps we have different points of view about DIY and the value of things
(I value the money I earn a lot).
Cheers and enjoy our lovely nanovna safely and in health.
Kind regards,
³¢³Ü¨ª²õ
A domingo, 19/04/2020, 04:37, Ben Yuen <benyuenkc@...> escreveu:
toggle quoted message
Show quoted text
I got two of this test board and made one of them. It worth the cost.
Why bother to do from scratch.
VR2XHQ
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Re: Use NanoVNA to Evaluate Unlabeled Toroids?
Hi Pete,
Enclosed is the s2p example as generated by NanoSaver 0.2.1 for a 3S4 type core (6 wdgs, 35mm diameter).
This output is :
Stim ? Real(S11)?? Imag(S11)?? Real(S21)?? Imag(S21)?? Real(S12) Imag(S12)?? Real(S22)?? Imag(S22)
This is a standard format, but the S-parameters may also be described as LogMag/Phase? or? LinMag/Phase
Anyway, nanosaver outputs in the Real / Imag? format.
73,
Arie PA3A
Op 18-4-2020 om 20:02 schreef WB2UAQ:
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Hi Arie,
Does Nanovna Sharp output a different format than Nanovna Saver? Just looked at an s2p file from sharp. It appears to be the S21 linear and phase angle. The DUT is 15 turns on a high permeability MnZn core. Goes thru resonance about 1.83 to 1.92 MHz as S21 goes thru a minimum and the phase angle switches from a neg angle (inductive) to a pos angle(capacitive). As shown in the attached s2p file.
73, Pete
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I got two of this test board and made one of them. It worth the cost. Why bother to do from scratch.
VR2XHQ
|
Re: nanoVNA-H -Strange behavior with YAGI Ant
Measuring antennas...
Depending if the antenna is balanced like a dipole then a choke balun
(1:1 unun)is a must at the antenna as RF on the shield will be painful
and inconsistant.
Antennas like yagies are very construction intense and often designed for COAX
so choking is not generally required. However they must be high enough or
pointed UP (to the sky) with the reflector well above ground ( least 3-6ft/1-2M)
or you will see your own reflections as increased SWR or lumps in the scan.
Further Gamma (and T) matched antennas must be both tuned for correct
match by the match elements and the driver element and other elements must
be on frequency (for length or diameter) or the band width may be narrower than
desired or expected.
for yagis some cases the mast must be in place to get full result at VHF especially
if the antenna is oriented vertical.
IF you want the cable out of the influence picture then calibrate to the end of
the cable, then you will get the antenna impedance and SWR. It is best to
use low loss cable for that but anything reasonable works. For antennas in
the 6m to 70cm I have a piece of teflon cable 5M long type RG401 for that
with N connectors.
Allison
-----------------
No direct email, it goes to bit bucket due address harvesting in groups.IO
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Thanks Kurt. I went to Gunthard's web page and I will install the software. My nano will arrive on Monday.
--
Ron
WA0RJ
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Re: nanoVNA-H -Strange behavior with YAGI Ant
I need a toroid balun when I measure anything which radiates. I hope this helps.
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TDR gives lenght and VNA wants delay for a cable
I have a short lenght of cable between VNA and Device Under Test. It would help if TDR and VNA had same units.
There are formulas, but they need searching, I can't remember them out of my head.
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Re: nanoVNA-H -Strange behavior with YAGI Ant
Don't forget if the load is close to or at 50 ohms, the length of you coax means very little as long as the coax length? is reasonable.? So if you measure close to 50 ohms that's what the load is. Ray, W4BYG On 4/18/2020 18:38, olivier LAVAUX wrote: hello
to be sure is to test as near as possible of the antenna less than one
meter. And afterwards to use the coaxial cable. Depending of the nature and
the length of your cable, you may find very different results! With the
transmitter and the coaxial and the antenna, you test the whole system, not
only your antenna. You can verify this by adding a length of cable and keep
all other parameters identical.
73
F6CNG Olivier
Le jeu. 16 avr. 2020 ¨¤ 09:06, <s_peter@...> a ¨¦crit :
The Setup is 300W output on 144.300Mhz.The Antenna is 11El.long YAGI on
144 Mhz with Gamma Match and aprox.11m.long RG213 coax (8*¦Ë*0.66).
Measured on the coax in the shack.
The SWR with SWR Meter is 1.06 in the range 143.900Mhz-144.600Mhz.Below
and above this range SWR start to rised quick.
nanoVNA-H v.3.3 blu PCB is calibrated perfect - 2 x RG316 cm cables
SO259 to SMA from eBay, SOLT SO259 verifyed (forget for bad
calibration).On the Screenshot Min SWR and the best Return loss are on
142.000 Mhz. ??? .On 142 Mhz the SWR is incredibly high with the SWR Meter!!
IF I retune the Gamma for min SWR on 144.300Mhz and best Return loss with
only nanoVNA...they are: SWR 1.65 (cant achieve less) and Ret.loss -12 db
->Realy bad, but the Screen shot is prety good -:) ...clear hollow
Is that due to the coax in the path ?? Any sugestions ....
-- They say a smart person learns from their mistakes. A wise person learns from the mistakes of others. -- This email has been checked for viruses by AVG.
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Re: nanoVNA-H -Strange behavior with YAGI Ant
hello
to be sure is to test as near as possible of the antenna less than one
meter. And afterwards to use the coaxial cable. Depending of the nature and
the length of your cable, you may find very different results! With the
transmitter and the coaxial and the antenna, you test the whole system, not
only your antenna. You can verify this by adding a length of cable and keep
all other parameters identical.
73
F6CNG Olivier
toggle quoted message
Show quoted text
Le jeu. 16 avr. 2020 ¨¤ 09:06, <s_peter@...> a ¨¦crit : The Setup is 300W output on 144.300Mhz.The Antenna is 11El.long YAGI on
144 Mhz with Gamma Match and aprox.11m.long RG213 coax (8*¦Ë*0.66).
Measured on the coax in the shack.
The SWR with SWR Meter is 1.06 in the range 143.900Mhz-144.600Mhz.Below
and above this range SWR start to rised quick.
nanoVNA-H v.3.3 blu PCB is calibrated perfect - 2 x RG316 cm cables
SO259 to SMA from eBay, SOLT SO259 verifyed (forget for bad
calibration).On the Screenshot Min SWR and the best Return loss are on
142.000 Mhz. ??? .On 142 Mhz the SWR is incredibly high with the SWR Meter!!
IF I retune the Gamma for min SWR on 144.300Mhz and best Return loss with
only nanoVNA...they are: SWR 1.65 (cant achieve less) and Ret.loss -12 db
->Realy bad, but the Screen shot is prety good -:) ...clear hollow
Is that due to the coax in the path ?? Any sugestions ....
|
Re: Use NanoVNA to Evaluate Unlabeled Toroids?
Hi Arie,
Does Nanovna Sharp output a different format than Nanovna Saver? Just looked at an s2p file from sharp. It appears to be the S21 linear and phase angle. The DUT is 15 turns on a high permeability MnZn core. Goes thru resonance about 1.83 to 1.92 MHz as S21 goes thru a minimum and the phase angle switches from a neg angle (inductive) to a pos angle(capacitive). As shown in the attached s2p file.
73, Pete
|
Well I have ordered parts to make 3 of these for less than 4USD.
And with one of these, I can make different configurations...
[image: image.png]
You are right, the kit its pre-made, but I have time to wait for the parts,
and enough skills to make this during the quarantine between sips of a nice
Portuguese red wine after dinner... ;)
*73 de ³¢³Ü¨ª²õ, CT2FZI*
*QRV @ 145.300 MHz | **CQ0VMST (VHF REP Monsanto)*
<>
<>
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On Sat, 18 Apr 2020 at 15:27, hwalker <herbwalker2476@...> wrote: On Sat, Apr 18, 2020 at 04:21 AM, CT2FZI wrote:
...If one has that basic soldering skills you could build these for less
than 4USD, specially if you just build the test fixture...
===============================
Yes,
The parts count are less than 4 usd, but the hassle of ordering the
strip board, headers and sma connectors from one source make purchasing the
kit attractive. The PCB is also much nicer than most of us could produce
using a strip board.The SDR Kits Testboard is twice as much and also
requires assembly. So if you were already considering purchasing that test
board, the NanoVNA Testboard is another less expensive option. I ordered
two and with the 5% discount and $2.00 new user coupon paid less than
$20.00. With the COVID-19 shipping delays I don't expect to see them until
late May, but I'm in no hurry.
SDR Kits has a couple of documents on their website that are a must have
for anyone considering purchasing the NanoVNA Testboard kit:
Proper acknowledgement to SDR Kits for originating the design concept.
- Herb
|
Re: Use NanoVNA to Evaluate Unlabeled Toroids?
Pete,
Thank you so much for this information and spreadsheet!
Looking forward to use it...!
*73 de ³¢³Ü¨ª²õ, CT2FZI*
*QRV @ 145.300 MHz | **CQ0VMST (VHF REP Monsanto)*
<>
<>
toggle quoted message
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On Sat, 18 Apr 2020 at 13:54, WB2UAQ <pschuch@...> wrote: To calculate the Z of the DUT between Ch0 and Ch1 (using S21 Series
method), I initially used G3TXQ's method after converting from his formats
to what the Nanovna outputs. However, I found an Agilent presentation
"Challenges and Solutions for Impedance Measurements" on the web. The
author described several methods including an S21 Shunt and and S21 Series
method of measuring a device's impedance. I used his general formulas and
converted them to run in Excel. I'll try to attach the spreadsheet.
The G3TXQ method uses an AIM brand instrument that Steve had. He did a
great job of reasoning-out how to calculate the series method. The Agilent
presentation gave us a better form to use and after some tinkering with the
trig I was able to get the formulas to agree:)
I have good results compared against an expensive 4 terminal instrument.
Please let me know how it works out for you. Thanks! 73, Pete
Sorry if some one else already posted something on this.
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Aleks would do that in the language of the forum, ie English.
When I log in and write on the Russian forum, I do not write in Hungarian.
Thanks.
--
*** ***
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Re: Use NanoVNA to Evaluate Unlabeled Toroids?
Pete,
Thanks for that!
I had already modified the G3TXQ sheet, but yours is nice and simple.
One thing I think I shpould mention, your entry fields are: linear(S21) and phase(S21)
In the S2P files coming from my nanoVNA those numbers are not given, but Real(S21) and Imag(S21) are. So now I'm only using the bottom part of the sheet. It certainly cleans up my first modified G3TXQ thingy :-).
73
Arie PA3A
Op 18-4-2020 om 14:54 schreef WB2UAQ:
toggle quoted message
Show quoted text
To calculate the Z of the DUT between Ch0 and Ch1 (using S21 Series method), I initially used G3TXQ's method after converting from his formats to what the Nanovna outputs. However, I found an Agilent presentation "Challenges and Solutions for Impedance Measurements" on the web. The author described several methods including an S21 Shunt and and S21 Series method of measuring a device's impedance. I used his general formulas and converted them to run in Excel. I'll try to attach the spreadsheet.
The G3TXQ method uses an AIM brand instrument that Steve had. He did a great job of reasoning-out how to calculate the series method. The Agilent presentation gave us a better form to use and after some tinkering with the trig I was able to get the formulas to agree:)
I have good results compared against an expensive 4 terminal instrument. Please let me know how it works out for you. Thanks! 73, Pete
Sorry if some one else already posted something on this.
|
On Sat, Apr 18, 2020 at 04:21 AM, CT2FZI wrote:
...If one has that basic soldering skills you could build these for less than 4USD, specially if you just build the test fixture...
===============================
Yes,
The parts count are less than 4 usd, but the hassle of ordering the strip board, headers and sma connectors from one source make purchasing the kit attractive. The PCB is also much nicer than most of us could produce using a strip board.The SDR Kits Testboard is twice as much and also requires assembly. So if you were already considering purchasing that test board, the NanoVNA Testboard is another less expensive option. I ordered two and with the 5% discount and $2.00 new user coupon paid less than $20.00. With the COVID-19 shipping delays I don't expect to see them until late May, but I'm in no hurry.
SDR Kits has a couple of documents on their website that are a must have for anyone considering purchasing the NanoVNA Testboard kit:
Proper acknowledgement to SDR Kits for originating the design concept.
- Herb
|
"40pin round row seat x2" You cut them to the length required. 73 -Jim NU0C On Sat, 18 Apr 2020 05:33:59 -0700 "Oristo" <ormpoa@...> wrote: Does that kit actually include the pictured 7x7 turned pin socket?
It is NOT on the packing list...
|
Re: Use NanoVNA to Evaluate Unlabeled Toroids?
To calculate the Z of the DUT between Ch0 and Ch1 (using S21 Series method), I initially used G3TXQ's method after converting from his formats to what the Nanovna outputs. However, I found an Agilent presentation "Challenges and Solutions for Impedance Measurements" on the web. The author described several methods including an S21 Shunt and and S21 Series method of measuring a device's impedance. I used his general formulas and converted them to run in Excel. I'll try to attach the spreadsheet.
The G3TXQ method uses an AIM brand instrument that Steve had. He did a great job of reasoning-out how to calculate the series method. The Agilent presentation gave us a better form to use and after some tinkering with the trig I was able to get the formulas to agree:)
I have good results compared against an expensive 4 terminal instrument. Please let me know how it works out for you. Thanks! 73, Pete
Sorry if some one else already posted something on this.
|
Does that kit actually include the pictured 7x7 turned pin socket?
It is NOT on the packing list...
|
CT2FZI
Arie Kleingeld PA3A
Ray, W4BYG
Gyula Molnar
Jim Shorney
Oristo