you shoud measeure a ht antenna like you would use them .. means hold the vna in your hand
the coupling to the body is needed on some if not all ht antennas (the transmiter needs something "to feed against" ... a virtual ground so to speak)
you see big changes if you hold the vna or not?? no wonder!! ... the case of the vna is to small for a ground on 70cm and even more on 2m ...
think about ....
dg9bfc sigi
Am 01.09.2022 um 20:20 schrieb n1evh via groups.io:
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I don't think I'm going to need any of those BNC to SMA
connector holders... as I have a few of these that I could
put onto the NanoVNA...
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or if you want them gold plated...
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These would sit right against the body of the NanoVNA.
I'm looking for a stand... that I can put the other end into
so that the antenna connectors (SMA, BNC, whatever) would
be facing up... to keep the HT antennas vertical. an not
touching anything when testing them. I was wondering if
anyone has made one or just designed one so it could be
printed out on a DC printer.
If you just stand the NanoVNA on its end and you have it
connected to a laptop or tablet with a USB cable... morning
the laptop or tablet around... will make the USB cable move
and most likely make the NanoVNA fall over. A plastic stand
to put the NanoVNA in... would keep it from falling over.
Mike - N1EVH
On 9/1/2022 12:46 PM, Dave Merrill wrote:
If you have access to a 3-D printer, there are a ton of designs for NanoVNA
cases, holders, connection extensions, etc. Here is but one:
Many public libraries have Maker Labs. You upload the design file to their
server and they notify you when it's done. My library charges a nominal fee
for the amount of materials used.
Dave N9ZC
On Thu, Sep 1, 2022, 9:28 AM F1AMM<18471@...>? wrote:
You may have forgotten that you can put an extension cord of the length
you want between the nanaoVNA box and the location where you are going to
do the calibration. Even the imperfections of the extension will be
compensated by the calibration. I did a test with a 93 ¦¸ cable.
Take advantage of this extension to change the type of connector. Switch
to a female BNC socket for example, firmly fixed on a support. SMA are too
fragile to be screwed and unscrewed too often.
--
F1AMM Fran?ois
De la part de n1evh via
Envoy¨¦ : jeudi 1 septembre 2022 16:10
