开云体育

Just simple overload of the sensors. They typically are tied together
throughout a single installation which may consist of a whole apartment
complex. If one is tripped, the whole complex is tripped.

For example, if you connect a fast diode to a couple of clip leads and
measure the developed (rectified) voltage while you're transmitting, it's
easily enough potential to "trip" about any modern semiconductor into
conduction. You'd be surprised how sensitive modern electronics are to
stray RF fields!! I used to do just this for Uncle. I can't confirm or
deny anything.......

Dave - W?LEV



<>
Virus-free.www.avg.com
<>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Fri, Mar 7, 2025 at 4:24?PM Jim Blanchard via groups.io <proptop12=
[email protected]> wrote:

Just want to understand correctly why the fire alarms went off.
I'm thinking the fire alarms are on the 450MHz band somewhere. So are they
set off due to some harmonic from the HF bands you all are trying, or is it
just plain RFI from the non-resonant attempt for an antenna?
Thanks and 73.
Jim - N?TRP

--

*Dave - W?LEV*


--
Dave - W?LEV

Just want to understand correctly why the fire alarms went off.
I'm thinking the fire alarms are on the 450MHz band somewhere. So are they set off due to some harmonic from the HF bands you all are trying, or is it just plain RFI from the non-resonant attempt for an antenna?
Thanks and 73.
Jim - N?TRP

Orrin

0.7.3 appears to be the latest, released last week


Is working ok on both my win 10 and win 11 machines

Good luck.


Cheers
Phil
VK2KKZ

Nah, not even remotely a possibility. One of the three machines is a server-class box that doesn't have a battery (other than the CMOS backup cell).

Kind of got it down to changes in the kernel module, xhci from uhci. Might be wrong but that's where the debug is pointing.

VK2KKZ de WN1Z

Phil, that's good news, a clone is unlikely. The 'RUNING' typo is also
visible on the Sysjoint SV4401A io.groups announcement of 0.5.9 firmware.

I posted over there that i found nanoVNA Saver 0.7.3 that works with the
SV4401A. But it only works on *one* of my Win10 machines, not the other.
That could be a problem with my PC.


Is there a better PC software available, than the 0.7.3 ?
73 Orrin WN1Z



El jue, 6 mar 2025 a la(s) 4:30?p.m., Phil Taylor via groups.io (philbyt1=
[email protected]) escribió:

Orrin

This post mentions that "firmware of SV4401A is encrypted, we have not
found a cloned SV4401A so far on the market"


Mine also is firmware 0.5.9, which is the latest over at:
[email protected], in the files section.

I also have the "Runing" typo, so I suspect we are OK and don't have a
clone.

Regards
Phil
VK2KKZ

Orrin

This post mentions that "firmware of SV4401A is encrypted, we have not found a cloned SV4401A so far on the market"


Mine also is firmware 0.5.9, which is the latest over at: [email protected], in the files section.

I also have the "Runing" typo, so I suspect we are OK and don't have a clone.

Regards
Phil
VK2KKZ

You will do far better to connect the right most antenna and collapse it toa 1/4-wavelength at 433 MH

Why do you say that ? Can't find the extensible antenna anyway.

I would not say that. Aside from measuring a monopole + cable and not just a monopole, it is not only loaded but also 27 cm long (17 cm for 433 MHz). Probably in order to present a good match to the receiver.
I have found the UHF, similar but shorter antenna; this one is 433 MHz and capturing all sort of signals.
Included:

? NESDR SMArt SDR in black brushed aluminum enclosure
? Antenna base w/ 2m RG58 cable
? Telescopic antenna mast (variable frequency)
? 433MHz (ISM) antenna mast (fixed frequency)
? UHF antenna mast (fixed frequency)

None of these antennas are really any good at HF frequencies and certainly
NOT down too 100 kHz. Sure, any hunk of conductor will capture
"something". But only the one on the right is acceptable for anyhthing,
but not good at everything. The left most antenna is strictly narrow-band
and may not even address the 433 MHz band.

You will do far better to connect the right most antenna and collapse it to
a 1/4-wavelength at 433 MHz. That would be about 6.5-inches long.

Dave - W?LEV

On Thu, Mar 6, 2025 at 10:34?PM kellogs via groups.io <mihai0226=
[email protected]> wrote:

Whoops!

(first picture, antenna is on the left)


On Friday, March 7, 2025 at 12:31:47 AM GMT+2, W0LEV via groups.io
<davearea51a@...> wrote:

No images attached.

Dave - W?LEV

On Thu, Mar 6, 2025 at 8:22?PM kellogs via groups.io <mihai0226=
[email protected]> wrote:

Hi,
i am trying to get a grip on using the nanoVNA. Does anybody have the 433
MHz antenna + base from the RTL-SDR kit ?

Firstly calibrated at device port (no cable), then measured the loaded
monopole through its magnetic antenna base at 433 MHz (first picture,
antenna is on the left): Nooelec - Nooelec NESDR SMArt v5 Bundle -
HF/VHF/UHF (100kHz-1.75GHz) RTL-SDR Kit with 3 Antennas. RTL2832U &
R820T2-Based Software Defined Radio

Mounted on car hood: 8 ohm at resonanceMounted on bicycle: 7.5 ohm at
resonance
Does it sound right ?

--

*Dave - W?LEV*


--
Dave - W?LEV

--

*Dave - W?LEV*


--
Dave - W?LEV

Sounds quite low. A monopole against a ground plane will be in the 25-35 ohm range. That one is obviously center loaded, but perhaps not for 433 MHz (more likely cell band at 850). Did you also get the extendable whip antenna? put that on the base and make it about 17 cm long. Or a piece of wire.

Whoops!

(first picture, antenna is on the left)

No images attached.

Dave - W?LEV

On Thu, Mar 6, 2025 at 8:22?PM kellogs via groups.io <mihai0226=
[email protected]> wrote:

Hi,
i am trying to get a grip on using the nanoVNA. Does anybody have the 433
MHz antenna + base from the RTL-SDR kit ?

Firstly calibrated at device port (no cable), then measured the loaded
monopole through its magnetic antenna base at 433 MHz (first picture,
antenna is on the left): Nooelec - Nooelec NESDR SMArt v5 Bundle -
HF/VHF/UHF (100kHz-1.75GHz) RTL-SDR Kit with 3 Antennas. RTL2832U &
R820T2-Based Software Defined Radio

Mounted on car hood: 8 ohm at resonanceMounted on bicycle: 7.5 ohm at
resonance
Does it sound right ?

--

*Dave - W?LEV*


--
Dave - W?LEV

Clyde, thanks for that info. The SV4401A group. Just what i need.

Best 73
Orrin WN1Z


El jue, 6 mar 2025 a la(s) 9:59?a.m., Clyde Lambert via groups.io
(clyde.lambert@...) escribió:

Hello,
There is a groups.io group you need to go to.
SV4401A:



It is the correct group for your version of a NanoVNA.
It is a different design than most of the NanoVNAs discussed in this group.
Hope this helps

Clyde KC7BJE

Hi,
i am trying to get a grip on using the nanoVNA. Does anybody have the 433 MHz antenna + base from the RTL-SDR kit ?

Firstly calibrated at device port (no cable), then measured the loaded monopole through its magnetic antenna base at 433 MHz (first picture, antenna is on the left):? Nooelec - Nooelec NESDR SMArt v5 Bundle - HF/VHF/UHF (100kHz-1.75GHz) RTL-SDR Kit with 3 Antennas. RTL2832U & R820T2-Based Software Defined Radio

Mounted on car hood:? 8 ohm at resonanceMounted on bicycle:? 7.5 ohm at resonance
Does it sound right ?

Linux probably thinks the device is pulling too much power. I'd ensure
that the battery is fully charged.
See

for a bit more detail.
73,
-Rick

On Thu, Mar 6, 2025 at 1:16?PM Wes N9KDY via groups.io <wwill1066=
[email protected]> wrote:

I have tried searching the group.io archive and got nowhere. Hopefully
this is a new problem, and I didn't just miss it.

I flashed this H4 just over 2 years ago (Feb 2023) to version 1.2.19 using
this same hardware but a then-current version of Debian Linux. Now I'm
using a newer Debian version (Bookworm), and cannot connect to the Nano in
any mode, scanning or DFU.

"new full-speed USB device number XX using xhci_hcd"
"Device not responding to setup address."
"device not accepting address XX, error -71"

"XX" increments at every attempt to connect.

The only difference I can find in my notes from 2 years ago is the kernel
module is no longer "uhci_hcd," and is instead "xhci_hcd." Has the Linux
community "upgraded" me beyond the ability to flash this thing? Am I
needing to get the serial port dongle and some grabber clip leads?

--
Rick Murphy, D. Sc., CISSP-ISSAP, K1MU/4, Annandale VA USA

I have tried searching the group.io archive and got nowhere. Hopefully this is a new problem, and I didn't just miss it.

I flashed this H4 just over 2 years ago (Feb 2023) to version 1.2.19 using this same hardware but a then-current version of Debian Linux. Now I'm using a newer Debian version (Bookworm), and cannot connect to the Nano in any mode, scanning or DFU.

"new full-speed USB device number XX using xhci_hcd"
"Device not responding to setup address."
"device not accepting address XX, error -71"

"XX" increments at every attempt to connect.

The only difference I can find in my notes from 2 years ago is the kernel module is no longer "uhci_hcd," and is instead "xhci_hcd." Has the Linux community "upgraded" me beyond the ability to flash this thing? Am I needing to get the serial port dongle and some grabber clip leads?

Hello,
There is a groups.io group you need to go to.
SV4401A:



It is the correct group for your version of a NanoVNA.
It is a different design than most of the NanoVNAs discussed in this group.
Hope this helps

Clyde KC7BJE

Thanks from a newbie
________________________________
From: [email protected] <[email protected]> on behalf of Gareth Evans via groups.io <headstone255@...>
Sent: Thursday, March 6, 2025 2:29 AM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Apologies if flogging a dead horse! CAL Correction?

It's your calibration!

O - Open; S - Short; L - Load (The 50 Ohm)


On Wed, Mar 5, 2025 at 09:48 PM, CLIFTON HEAD wrote:

What does OSL stand for and where or how to find it on the VNA H4 or F V2

Well NanoVNA Saver 0.6.5 used to connect to com port on Win 10 and now it does not. I start the nanovna software, turn on the NanoVNA and when
I click Rescan the software crashes off. If I turn on the NanoVNA first and then start the software I get Failed to execute nanosaver could not open Com 5. When I check Device Manager com ports I see Com port 5 and the yellow triangle. I deleted the com port and plugged the C cable from the NanoVNA-H into the pc and the com port 5 reappeared with the yellow triangle.

So I downloaded Nanosaver 0.7.3 and with NanoVNA turn on then start nanosaver 0.7.3 I get the com port 5 error. If I start nanosaver first and then turn on NanoVNA-H I click rescan and nothing happens.

The yellow triangle on the STMicroelectronics Virtual COM Port (COM 5) is causing nanosaver not to connect to pc. I have downloaded latest nanovna saver driver and when I try to update Win says I have the latest driver. I am stuck as NanoVNA saver used to work, any ideas how to remove yellow triangle from Com Port 5 I think that's my issue or I am missing something else.
Mick N3OJP

Entered 82 no % (.82) just 82 and it comes up on the screen as 82%
________________________________
From: [email protected] <[email protected]> on behalf of Geoff Peters - AB6BT via groups.io <AB6BT@...>
Sent: Wednesday, March 5, 2025 8:43 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] NanoVNA F V2 not working correctly

Just out of curiosity...for the H4 the VF is entered as a decimal as
0.82. Is the F V2 VF entered the same or is it in percent?

73,
Geoff -->AB6BT


On 3/5/2025 6:18 PM, CLIFTON HEAD via groups.io wrote:

Yes, if you mean the value. Both 82% for RG-8X. Even if the VF was off maybe 5 meters still shouldn't come up with over a 1000 m for the 16 m / 52' length.
________________________________
From: [email protected] <[email protected]> on behalf of Mark Foster via groups.io <m.foster99@...>
Sent: Wednesday, March 5, 2025 8:01 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] NanoVNA F V2 not working correctly

Did you enter the Velocity Factor (VF) of the coax the same in both units ?