How can I use a nanoVNA to test an active antenna
Hello all,
I'd like to check active (receiving) antennas from my pit, that is through the coax, to fine tune them (band pass filters, etc).
These antennas are requiring a bias voltage.
Is it possible with the NanoVNA?
What is the best method to do so?
Any pointer to some docs? Attenuators, how to calibrate etc.
I'm using active antennas schematics from Martin, G8JNJ (Thanks Martin). I believe he is member of this group. :-)
Check
Thanks in advance
Jean
|
Re: Basics to look at when buying nanovna
What are your intended uses/frequencies?
I have both the -F and the -H4. Either are great performers for the
amateur. Personally, I don't like the small screen versions (my eyes are
73 years 'young'!). The -H4 covers up to 1.5 GHz where the -F covers to 1
GHz. The original covers to 900 MHz (which I also have). All are
improvements over the initially offered units.
All the NANOVNA offerings provide *far* more than the average 'antenna
analyzers' marketed into the amateur market. There will be a learning
curve if you are not used to professional RF design and measurements using
complex impedances and the Smith Chart. But they are more than worth the
energy and time spent learning about the 'nitty-gritty' of RF parameter
measurements.
Dave - W?LEV
<>
Virus-free.
www.avast.com
<>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
toggle quoted message
Show quoted text
On Thu, Mar 5, 2020 at 4:14 PM Jan PA3GSV <pa3gsv@...> wrote: Dear all,
I'm about to buy 2 nanovna's. What are the do's and don'ts to look out for.
Don't want to start a message chain, just looking for the basics, like
firmware version, the black nanovna has some shielding, etc.
Thanks in advance for any answers.
br Jan PA3GSV
--
*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*
|
Basics to look at when buying nanovna
Dear all,
I'm about to buy 2 nanovna's. What are the do's and don'ts to look out for.
Don't want to start a message chain, just looking for the basics, like firmware version, the black nanovna has some shielding, etc.
Thanks in advance for any answers.
br Jan PA3GSV
|
Gabriel,Is this the same Maggie that was selling the H4?If yes, can we send an email to purchase it?Thanks
toggle quoted message
Show quoted text
On Thursday, March 5, 2020, 10:39:22 a.m. GMT-5, Gabriel Tenma White <owowowowo123@...> wrote:
Here's the link to the taobao listing:
Although if you are outside China I would wait for the tindie listing; it's supposed to be awaiting approval now.
|
Ha! That is so much easier Randy, thank you. The 'thousand Yaun deposit' I thought it said must be a product of how badly I can read Chinese... On Thu, Mar 5, 2020 at 10:51 AM Randall Steffens II via Groups.Io <pomology= [email protected]> wrote: I have a Taobao account and don¡¯t read any Chinese. Just use the Google
Chrome browser and it¡¯s auto-translate function. It will automatically
translate well enough to make out what to do to set up an account. I was
not required to make any deposit at all to set up my account, certainly not
$150!
Randy
NC8U
|
I have a Taobao account and don¡¯t read any Chinese. Just use the Google Chrome browser and it¡¯s auto-translate function. It will automatically translate well enough to make out what to do to set up an account. I was not required to make any deposit at all to set up my account, certainly not $150!
Randy
NC8U
toggle quoted message
Show quoted text
On Mar 5, 2020, at 7:46 AM, computererds <foster.ryan@...> wrote:
Thanks Gabriel! I'll wait on it showing up on Tindie knowing it's on the
way. I can't read enough Chinese to already have made an account on
Taobao--and it would be a little silly to put the $150 deposit in to make
one $50 item order :)
On Thu, Mar 5, 2020 at 10:39 AM Gabriel Tenma White <
OwOwOwOwO123@...> wrote:
Here's the link to the taobao listing:
Although if you are outside China I would wait for the tindie listing;
it's supposed to be awaiting approval now.
|
Thanks Gabriel! I'll wait on it showing up on Tindie knowing it's on the way. I can't read enough Chinese to already have made an account on Taobao--and it would be a little silly to put the $150 deposit in to make one $50 item order :) On Thu, Mar 5, 2020 at 10:39 AM Gabriel Tenma White < OwOwOwOwO123@...> wrote: Here's the link to the taobao listing:
Although if you are outside China I would wait for the tindie listing;
it's supposed to be awaiting approval now.
|
You made me wonder, so now it's also been tested with a vpn from HK and the PRC proper--still no results. Maybe someone can tell me what nanovna v2 translates to in chinese characters and I can find something. On Thu, Mar 5, 2020 at 10:19 AM dwabbit via Groups.Io <dwabbit= [email protected]> wrote: on a uk VPN cant find a thing closest vpn i can find is the
Philippines. i find some nanovna but not the version 2
On 05/03/2020 15:00, Larry Rothman wrote:
Most likely Chinese Gov't is filtering a lot of info passing through the 'Great Firewall of China' due to COVID19 concerns and this is
'collateral damage'.
On Thursday, March 5, 2020, 9:56:43 a.m. GMT-5, Salil Tembe <
salil2106@...> wrote:
Larry,
The seller in Shenzhen is able to see it listed but I can't view it here
in India.
|
My seller just replied and will shipping 2 units to me by this weekend. Quite excited to get my hands on it.
--
Salil Tembe
(Nuclearrambo.com)
|
on a uk VPN cant find a thing?? closest vpn i can find is the Philippines.? i find some? nanovna but not the version 2
toggle quoted message
Show quoted text
On 05/03/2020 15:00, Larry Rothman wrote: Most likely Chinese Gov't is filtering a lot of info passing through the 'Great Firewall of China' due to COVID19 concerns and this is 'collateral damage'.
On Thursday, March 5, 2020, 9:56:43 a.m. GMT-5, Salil Tembe <salil2106@...> wrote:
Larry,
The seller in Shenzhen is able to see it listed but I can't view it here in India.
|
Most likely Chinese Gov't is filtering a lot of info passing through the 'Great Firewall of China' due to COVID19 concerns and this is 'collateral damage'.
toggle quoted message
Show quoted text
On Thursday, March 5, 2020, 9:56:43 a.m. GMT-5, Salil Tembe <salil2106@...> wrote:
Larry,
The seller in Shenzhen is able to see it listed but I can't view it here in India.
--
Salil Tembe
(Nuclearrambo.com)
|
Larry,
The seller in Shenzhen is able to see it listed but I can't view it here in India.
--
Salil Tembe
(Nuclearrambo.com)
|
Did you actually find it listed on Taobao or are you attempting to buy through a seller that sold the older versions?
toggle quoted message
Show quoted text
On Thursday, March 5, 2020, 9:20:47 a.m. GMT-5, Salil Tembe <salil2106@...> wrote:
I reviewed the first version. I can test this one too. I'm trying to get it through my component dealer in Shenzhen. He is trying to get two for me.
Unfortunately, the taobao seller isnt responding to the messages he has sent.
--
Salil Tembe
(Nuclearrambo.com)
|
I reviewed the first version. I can test this one too. I'm trying to get it through my component dealer in Shenzhen. He is trying to get two for me.
Unfortunately, the taobao seller isnt responding to the messages he has sent.
--
Salil Tembe
(Nuclearrambo.com)
|
same here? cannot find it anywhere
toggle quoted message
Show quoted text
On 05/03/2020 04:13, Gabriel Tenma White wrote: I've gotten news that it's started selling on taobao and tindie will soon follow; should show up if you search "nanovna v2" on taobao.
|
I'm not a tech leader by any stretch but I do have a variety of radar antennas and waveguides for various freqs up to the device's 4.4GHz range that I'll use to test this on. So far, I haven't found it at Taobao or anywhere else.
--
John AE5X
|
Who is our group tech leader who is going to test it and give a report?
73
Glen K4KV
toggle quoted message
Show quoted text
On 3/4/2020 23:13, Gabriel Tenma White wrote: I've gotten news that it's started selling on taobao and tindie will soon follow; should show up if you search "nanovna v2" on taobao.
|
Re: Ceramic filter measurement
@Bob,
Exactly. Be aware that the curves in the muRata datasheet does only show pass band vs real load. Imaginary loads like parasitic capacitance will also impact.
|
Re: Anyone had news from Maggie King?
Chris - I didn't pay for DHL shipping. Apologies for being unclear.
vy 73, Russ
|
Re: Anyone had news from Maggie King?
On Tue, Mar 3, 2020 at 01:09 PM, Russ@va3rr wrote:
My H4 arrived today. Although I didn't pay for it,
Russ, how does one (say, somebody like me!) get the option of not paying for one to get one?? ;-) -- Regards, Chris
|
Jan PA3GSV
va3rr
Chris K2STP