开云体育

Put my new nanovna-H4 to work this afternoon tuning up a new MFJ Cobweb.
Prett amazed at this $50USD device. Every time I changed bands I did a
calibration. When I had an antenna analyzer I never had to do a cal. The
analyzer I had did impedance as well as SWR. Why is this?

73! Mark KA6WKE

Website:

Thank you to all for the replies. I have purchased a NanoVNA-H4 from Gigaparts. It seems to be a pretty nice unit. It came in a deluxe box with three loads, two USB-C cables, two short SMA-terminated coax cables and a strap with a guitar pick looking stylus.

Now the learning begins.

I might add that it is not in a case.

On Sun, May 17, 2020 at 4:15 PM GEO BADGER via groups.io <w3ab=
[email protected]> wrote:

Hans,

I believe you may be correct. You've got sharp eyes my friend.

?___
Sent from my two way wrist watch
73 de W3AB/GEO?

On May 17, 2020, 12:28, at 12:28, hansfree <hans@...>
wrote:

IMHO you are both wrong...

The pictures show the VNA with the short and open screwed on. The load
is on one of the cables via a F-F adapter. As far as I can make up from
the pictures the set is complete. There is a list of items in the
details if you scroll down.

73's Hans PA3AZA.

--
Paul

W8SBH
?? ?? ????
(this too shall pass)

Hans,

I believe you may be correct. You've got sharp eyes my friend.

?___
Sent from my two way wrist watch
73 de W3AB/GEO?

Yes, I use mine to make HF and 2 meter antennas too.

WO4ROB, Rob

WO4ROB
________________________________
From: [email protected] <[email protected]> on behalf of hansfree <hans@...>
Sent: Sunday, May 17, 2020 12:22:07 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Are any of the NanoVNA sold on Amazon any better or worse than any others? Is there a better U.S. site to order from?

IMHO you are both wrong...

The pictures show the VNA with the short and open screwed on. The load is on one of the cables via a F-F adapter. As far as I can make up from the pictures the set is complete. There is a list of items in the details if you scroll down.

73's Hans PA3AZA.

IMHO you are both wrong...

The pictures show the VNA with the short and open screwed on. The load is on one of the cables via a F-F adapter. As far as I can make up from the pictures the set is complete. There is a list of items in the details if you scroll down.

73's Hans PA3AZA.

Thanks, Geo
I thought the connectors looked unusual in the photo.
I'm sure I already have the adaptors in my radio parts box.
I report back how this unit works when I get it.
All I want to do is measure SWR on HF and 2 meters for homebrew antennas.

Michael,

You'll need 2 SMA/F - SMA/F adapters to use that one.

?___
Sent from my two way wrist watch
73 de W3AB/GEO?

Here is the cheapest one I have ever seen on Amazon:



$24.89 on Amazon. It doesn't include an open or short terminator, only a 50 ohm. It does include cables.

I couldn't resist. I ordered one.

I am making a loop antenna very similar to the OM0ET model, but adding capacitors with switches to add the 60 and 80m bands. I used the nanoVNA to see the resonance and I achieved my goal but with very high SWR by adding the capacitors. Testing at RX confirmed these high losses. It seemed clear that the problem was due to losses in the added capacitors, but not due to excess voltage since it was with a small signal. I chose these 3kV capacitors because I was planning to use the enTX antenna as well and had them in the drawer. The loss had to be due to excessive ESR (critical in loop antennas) and I decided to try measuring it with the nanoVNA. I have ESR meters but they are for electrolytic capacitors, with much higher capacities and at much lower frequencies. I left only the Smith graph and chose a frequency of 3.65MHz. Previously I calibrated the nanoVNA in a small margin around. The measurement results confirmed an ESR of around 3.5 ohms in both normal and HV ceramic capacitors and an ESR of 100-200 milliohms in silver mica capacitors.
The results once the latter were assembled were great, both with the nanoVNA and with the receptor.
These measurements have been made with the nanoVNA-F (I have both) and I really liked that it started with the latest measurement configuration and its much greater autonomy. In bright sunlight, the screen was hardly readable like his younger brother's.
Cheers

Thank you, Larry and DiSlord. I must have read that 50 times, and it never got to my memory with out errors. Problem resolved.
Thanks, Glenn W3WTE

Just did the test

Two mixers rated for 2GHz-4GHz with IF ports 10MHz-2GHz
Connect the nanoVNA CH0 and CH1 to the IF ports, LO ports together to a generator at 2350MHz. Filter to measure connected to RF ports
nanoVNA span 100MHz to 300MHz
Filter is 2.5GHZ to 2.6GHz
S21 loss through mixers only 13dB
I would have expected some leakage through the connected LO ports but nothing visible
Loads of dynamic range , easy to check the filter. Works much better than I expected.
This is also a good approach to measure the performance of the up conversion to 1st IF, the 1st IF filter and the downconversion to second IF (just before the 2nd IF filter) of a dual conversion front-end such as used in a spectrum analyzer or general coverage receiver. Temporarily set the 2nd IF to zero Hz and the nanoVNA can do the measurement.








--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

I paid 60.00 with tax and shipping from R&L electronics.?Sent via the Samsung Galaxy S10, an AT&T 5G Evolution capable smartphone

The "H4" was $75 plus tax, free shipping

Backup firmware to computer
/g/nanovna-users/topic/backup_firmware_to_computer/74035302?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,20,74035302

The DefuSe utility is used to upload and download the flash from the Nano.?


On Fri, 15 May 2020 at 8:07 PM, w3wte<g.laser@...> wrote: Hi Group,
Is their a way to download the settings I have created in the NANOVNA to a computer?? I have one version of the firmware loaded and calibrated. I would like to down load that version to the computer, Then up load a different firmware, set it up and save it as lets say "MY 136 MC". Possibly several versions saved that I could individually up load to the NAOVNA, for different tests. If possible just point me in a direction, and I will try to figure out.
Thanks, Glenn W3WTE

Check out the convertors designed for the HP8924 series like the 83236B which converted the PCS band 1.8 GHz to the cellular band (850 MHZ)

Hi Group,
Is their a way to download the settings I have created in the NANOVNA to a computer? I have one version of the firmware loaded and calibrated. I would like to down load that version to the computer, Then up load a different firmware, set it up and save it as lets say "MY 136 MC". Possibly several versions saved that I could individually up load to the NAOVNA, for different tests. If possible just point me in a direction, and I will try to figure out.
Thanks, Glenn W3WTE

I agree with Mike. Many of the others are knock-offs and may not be supported.

?___
Sent from my two way wrist watch
73 de W3AB/GEO?

Yes herb. You are correct that none of them are "official".
I guess my point was that if you get the NanoVNA-F from the aliexpress / Deepelec store
you will be guaranteed to get the actual BH5HNU unit, not a clone.
The BH5HNU unit is favored by me because of his dedication to improve the software and support
his customers.
73, Mike