LNA Design Using S Parameters
A 100 + page text with examples and data. Not available on the net.
From a Motorola Design Course, semiconductor division.
Interested, contact me off line.
73' Alan
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Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Found one for $8 refurbished and guaranteed for 30 days.
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Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Thanks Jim,
IT is a combination DVD-CD drive. According to my Service Manual it is HP part number F4640-60937
319422-001.
Al
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Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
I have a box full of NOS laptop DVD drives if you need one. Mostly SATA but a few PATA as well. 73 -Jim NU0C On Sat, 28 Jan 2023 09:31:02 -0800 "Al Waschka" <awaschka@...> wrote: Good to know that it should have worked. I had several of these laptops. I think I cleaned the drives and tossed the others but if I can find one or a replacement CD drive, I will see what happens when I load the .iso.
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Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Thanks Martin, for the update, and your attempt to help this NanoVNA noob.
I did not watch the full boot sequence. When I tried to load Greml again after trying to load a Debian live distro that wouldn't load, it listed failures, but it stopped and never completed the startup.
When Greml first loads, there is a menu there. Which option did you load? Down arrow to select the few highlighted options did not worlk for me. Perhaps I should have taken that bit of information as indication of a load problem.
Good to know that it should have worked. I had several of these laptops. I think I cleaned the drives and tossed the others but if I can find one or a replacement CD drive, I will see what happens when I load the .iso.
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Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Sometimes I question my sanity - this thread is such an example. Before I recommended grml, I picked up my grml32-small CD and booted my laptop; typed "dmesg -Hw" and plugged in the NanoVNA-H, switched it on and off, with and without jog switch - great display, just as expected. But then this message On Fri, Jan 27, 2023 at 11:59 PM, Al Waschka wrote:
When I enter the string you suggested it says -H is unrecognized.
and later:
Distro is very limited. Doesn't have -w either. I give up on Linux.
What have I done wrong? I always have this rescue CD with me and also use it when a PC in the family stops working (with the description: "I didn't do anything") - ok, the grml version is older, approx. 2020. Crap, did the makers " castrate" the programs to save space? So I downloaded the latest version grml32-small-2022.11, (just like Al); took an old lab laptop, booted it - typed in "dmesg -Hw" - perfect - detected all USB actions etc. Even if it is no longer helpful for Al - maybe it will help someone else who really wants help. In short - if you distrust your Windows, boot a Linux live system (only boot from CD, don't install anything) and explore the HW with the numerous tools - especially for NanoVNA and tinySA: Watch system messages in real time: dmesg -Hw What's going on at the USB: lsusb Martin
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Not to be captain obvious, but on your nanovna calibration, did you reset cal first and click done when finished?
I easily forgot and made this mistake early on and got weird results.
Bryan , N0LUF
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Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
I thought I might be able to see something in dmesg, as it worked before when I finally got grml-small loaded after several tries. Unfortunately I tried to load a better Linux distro but the CDROM drive was acting up. When I tried to reload greml-small again it wouldn't finish the install without errors.
The unit is packed and going to the PO tomorrow. I ordered a -H4 from R&L. Looking forward to using it.
Thanks to everyone who tried to help.
Al K5TAN
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Tim Dawson Sent: Saturday, January 28, 2023 2:09 AM To: [email protected]Subject: Re: [nanovna-users] NanoVNA Not Recognized by Laptop over USB After dfu Upgrade You can run "dmesg" alone and see what you see, then plug in and run it again, and if it saw the device, it will be at the end of the display, past what you saw the first time. On January 28, 2023 12:26:07 AM CST, Al Waschka <awaschka@...> wrote: Distro is very limited. Doesn't have -w either. I give up on Linux. I can't get the CD drive to load anything else or even to reload the Grml-small I had on there to begin with.
I received my USB-A Male to Male cable. I connected it, with an A-C adapter between the original W10 laptop and the NanoVNA. It gave the same result as the other two cables.
When I said the device was working properly in the analyzer mode I had only looked at boot behavior. I don't remember actually checking it on an antenna. When I connected it to my tuned antenna its readings are different from the SWR meter on my transceiver.
It has also started flashing the white screen momentarily when turning on in the analyzer mode. I don't recall noticing that before.
I think either the device is failing or possibly the hardware was not compatible with the firmware I loaded.
I am officially giving up on trying to figure out what happened. I guess I'll have to take the risk that it won't happen with whatever replacement unit I get.
Going back to vendor tomorrow.
K5TAN
ZZZZ
Out
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of
Tim Dawson
Sent: Friday, January 27, 2023 7:40 PM
To: [email protected]
Subject: Re: [nanovna-users] NanoVNA Not Recognized by Laptop over USB
After dfu Upgrade
You can still see what is going on without the "-H" option, the output
is just a little less clear. Basically, run "dmesg -w", and then plug
the USB device in, and you should see the system react to it. (You can
also see the same in syslog . . .)
On January 27, 2023 6:33:23 PM CST, Al Waschka <awaschka@...> wrote:
Thanks, I was wondering if that was the cause. I just picked up my ipad to check the syntax but saw your message first.
Greml small was suggested so that is what I loaded. I am running on an old xp box with 1G ram and 1.7 ghz celeron.
I¡¯ll try to find another to load.
On Jan 27, 2023, at 7:27 PM, Tim Dawson <tadawson@...> wrote:
?Looks like a distro with crippled dmesg . . . . the man page clearly states "-H: Human readable output" and "-w: wait" so the options *should* be valid.
On January 27, 2023 6:17:49 PM CST, Al Waschka <awaschka@...> wrote:
Actual response is Invalid parameter, I think
On Jan 27, 2023, at 6:00 PM, Al Waschka <awaschka@...> wrote: ?Hope this isn¡¯t considered off topic. It is about troubleshooting a NanoVNA.
Finally got the greml distro working. When I enter the string you suggested it says -H is unrecognized.
On Jan 27, 2023, at 6:07 AM, Ho-Ro <linuxaudio@...> wrote:
?On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:
I am trying to get my hands on a Liinux device to see how it
responds in both modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:
HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al,
You could download a "live" image, no installation required.
For your HW this small "rescue-linux" should be ok:
- Select the "grml-small" "32-bit PC" version, currently this one:
- Burn as ISO to a CD and boot the laptop from this CD.
- Then just type "dmesg -Hw" and connect your NanoVNA.
Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.).
Martin
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
-- Sent from my Android device with K-9 Mail. Please excuse my brevity.
|
Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Also "lsusb" can give a hint if the device was recognized.
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Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
You can run "dmesg" alone and see what you see, then plug in and run it again, and if it saw the device, it will be at the end of the display, past what you saw the first time.
toggle quoted message
Show quoted text
On January 28, 2023 12:26:07 AM CST, Al Waschka <awaschka@...> wrote: Distro is very limited. Doesn't have -w either. I give up on Linux. I can't get the CD drive to load anything else or even to reload the Grml-small I had on there to begin with.
I received my USB-A Male to Male cable. I connected it, with an A-C adapter between the original W10 laptop and the NanoVNA. It gave the same result as the other two cables.
When I said the device was working properly in the analyzer mode I had only looked at boot behavior. I don't remember actually checking it on an antenna. When I connected it to my tuned antenna its readings are different from the SWR meter on my transceiver.
It has also started flashing the white screen momentarily when turning on in the analyzer mode. I don't recall noticing that before.
I think either the device is failing or possibly the hardware was not compatible with the firmware I loaded.
I am officially giving up on trying to figure out what happened. I guess I'll have to take the risk that it won't happen with whatever replacement unit I get.
Going back to vendor tomorrow.
K5TAN
ZZZZ
Out
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Tim Dawson
Sent: Friday, January 27, 2023 7:40 PM
To: [email protected]
Subject: Re: [nanovna-users] NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
You can still see what is going on without the "-H" option, the output is just a little less clear. Basically, run "dmesg -w", and then plug the USB device in, and you should see the system react to it. (You can also see the same in syslog . . .)
On January 27, 2023 6:33:23 PM CST, Al Waschka <awaschka@...> wrote:
Thanks, I was wondering if that was the cause. I just picked up my ipad to check the syntax but saw your message first.
Greml small was suggested so that is what I loaded. I am running on an old xp box with 1G ram and 1.7 ghz celeron.
I¡¯ll try to find another to load.
On Jan 27, 2023, at 7:27 PM, Tim Dawson <tadawson@...> wrote:
?Looks like a distro with crippled dmesg . . . . the man page clearly states "-H: Human readable output" and "-w: wait" so the options *should* be valid.
On January 27, 2023 6:17:49 PM CST, Al Waschka <awaschka@...> wrote:
Actual response is Invalid parameter, I think
On Jan 27, 2023, at 6:00 PM, Al Waschka <awaschka@...> wrote: ?Hope this isn¡¯t considered off topic. It is about troubleshooting a NanoVNA.
Finally got the greml distro working. When I enter the string you suggested it says -H is unrecognized.
On Jan 27, 2023, at 6:07 AM, Ho-Ro <linuxaudio@...> wrote:
?On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:
I am trying to get my hands on a Liinux device to see how it
responds in both modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:
HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al,
You could download a "live" image, no installation required.
For your HW this small "rescue-linux" should be ok:
- Select the "grml-small" "32-bit PC" version, currently this one:
- Burn as ISO to a CD and boot the laptop from this CD.
- Then just type "dmesg -Hw" and connect your NanoVNA.
Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.).
Martin
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
|
Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Distro is very limited. Doesn't have -w either. I give up on Linux. I can't get the CD drive to load anything else or even to reload the Grml-small I had on there to begin with.
I received my USB-A Male to Male cable. I connected it, with an A-C adapter between the original W10 laptop and the NanoVNA. It gave the same result as the other two cables.
When I said the device was working properly in the analyzer mode I had only looked at boot behavior. I don't remember actually checking it on an antenna. When I connected it to my tuned antenna its readings are different from the SWR meter on my transceiver.
It has also started flashing the white screen momentarily when turning on in the analyzer mode. I don't recall noticing that before.
I think either the device is failing or possibly the hardware was not compatible with the firmware I loaded.
I am officially giving up on trying to figure out what happened. I guess I'll have to take the risk that it won't happen with whatever replacement unit I get.
Going back to vendor tomorrow.
K5TAN
ZZZZ
Out
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Tim Dawson Sent: Friday, January 27, 2023 7:40 PM To: [email protected]Subject: Re: [nanovna-users] NanoVNA Not Recognized by Laptop over USB After dfu Upgrade You can still see what is going on without the "-H" option, the output is just a little less clear. Basically, run "dmesg -w", and then plug the USB device in, and you should see the system react to it. (You can also see the same in syslog . . .) On January 27, 2023 6:33:23 PM CST, Al Waschka <awaschka@...> wrote: Thanks, I was wondering if that was the cause. I just picked up my ipad to check the syntax but saw your message first.
Greml small was suggested so that is what I loaded. I am running on an old xp box with 1G ram and 1.7 ghz celeron.
I¡¯ll try to find another to load.
On Jan 27, 2023, at 7:27 PM, Tim Dawson <tadawson@...> wrote:
?Looks like a distro with crippled dmesg . . . . the man page clearly states "-H: Human readable output" and "-w: wait" so the options *should* be valid.
On January 27, 2023 6:17:49 PM CST, Al Waschka <awaschka@...> wrote:
Actual response is Invalid parameter, I think
On Jan 27, 2023, at 6:00 PM, Al Waschka <awaschka@...> wrote: ?Hope this isn¡¯t considered off topic. It is about troubleshooting a NanoVNA.
Finally got the greml distro working. When I enter the string you suggested it says -H is unrecognized.
On Jan 27, 2023, at 6:07 AM, Ho-Ro <linuxaudio@...> wrote:
?On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:
I am trying to get my hands on a Liinux device to see how it
responds in both modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:
HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al,
You could download a "live" image, no installation required.
For your HW this small "rescue-linux" should be ok:
- Select the "grml-small" "32-bit PC" version, currently this one:
- Burn as ISO to a CD and boot the laptop from this CD.
- Then just type "dmesg -Hw" and connect your NanoVNA.
Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.).
Martin
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
-- Sent from my Android device with K-9 Mail. Please excuse my brevity.
|
Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
You can still see what is going on without the "-H" option, the output is just a little less clear. Basically, run "dmesg -w", and then plug the USB device in, and you should see the system react to it. (You can also see the same in syslog . . .)
toggle quoted message
Show quoted text
On January 27, 2023 6:33:23 PM CST, Al Waschka <awaschka@...> wrote: Thanks, I was wondering if that was the cause. I just picked up my ipad to check the syntax but saw your message first.
Greml small was suggested so that is what I loaded. I am running on an old xp box with 1G ram and 1.7 ghz celeron.
I¡¯ll try to find another to load.
On Jan 27, 2023, at 7:27 PM, Tim Dawson <tadawson@...> wrote:
?Looks like a distro with crippled dmesg . . . . the man page clearly states "-H: Human readable output" and "-w: wait" so the options *should* be valid.
On January 27, 2023 6:17:49 PM CST, Al Waschka <awaschka@...> wrote:
Actual response is Invalid parameter, I think
On Jan 27, 2023, at 6:00 PM, Al Waschka <awaschka@...> wrote: ?Hope this isn¡¯t considered off topic. It is about troubleshooting a NanoVNA.
Finally got the greml distro working. When I enter the string you suggested it says -H is unrecognized.
On Jan 27, 2023, at 6:07 AM, Ho-Ro <linuxaudio@...> wrote:
?On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:
I am trying to get my hands on a Liinux device to see how it responds in both
modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:
HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al,
You could download a "live" image, no installation required.
For your HW this small "rescue-linux" should be ok:
- Select the "grml-small" "32-bit PC" version, currently this one:
- Burn as ISO to a CD and boot the laptop from this CD.
- Then just type "dmesg -Hw" and connect your NanoVNA.
Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.).
Martin
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
|
Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Thanks, I was wondering if that was the cause. I just picked up my ipad to check the syntax but saw your message first.
Greml small was suggested so that is what I loaded. I am running on an old xp box with 1G ram and 1.7 ghz celeron.
I¡¯ll try to find another to load.
toggle quoted message
Show quoted text
On Jan 27, 2023, at 7:27 PM, Tim Dawson <tadawson@...> wrote:
?Looks like a distro with crippled dmesg . . . . the man page clearly states "-H: Human readable output" and "-w: wait" so the options *should* be valid.
On January 27, 2023 6:17:49 PM CST, Al Waschka <awaschka@...> wrote:
Actual response is Invalid parameter, I think
On Jan 27, 2023, at 6:00 PM, Al Waschka <awaschka@...> wrote: ?Hope this isn¡¯t considered off topic. It is about troubleshooting a NanoVNA.
Finally got the greml distro working. When I enter the string you suggested it says -H is unrecognized.
On Jan 27, 2023, at 6:07 AM, Ho-Ro <linuxaudio@...> wrote:
?On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:
I am trying to get my hands on a Liinux device to see how it responds in both
modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:
HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al,
You could download a "live" image, no installation required.
For your HW this small "rescue-linux" should be ok:
- Select the "grml-small" "32-bit PC" version, currently this one:
- Burn as ISO to a CD and boot the laptop from this CD.
- Then just type "dmesg -Hw" and connect your NanoVNA.
Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.).
Martin
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
|
Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Looks like a distro with crippled dmesg . . . . the man page clearly states "-H: Human readable output" and "-w: wait" so the options *should* be valid.
toggle quoted message
Show quoted text
On January 27, 2023 6:17:49 PM CST, Al Waschka <awaschka@...> wrote: Actual response is Invalid parameter, I think
On Jan 27, 2023, at 6:00 PM, Al Waschka <awaschka@...> wrote:
?Hope this isn¡¯t considered off topic. It is about troubleshooting a NanoVNA.
Finally got the greml distro working. When I enter the string you suggested it says -H is unrecognized.
On Jan 27, 2023, at 6:07 AM, Ho-Ro <linuxaudio@...> wrote:
?On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:
I am trying to get my hands on a Liinux device to see how it responds in both
modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:
HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al,
You could download a "live" image, no installation required.
For your HW this small "rescue-linux" should be ok:
- Select the "grml-small" "32-bit PC" version, currently this one:
- Burn as ISO to a CD and boot the laptop from this CD.
- Then just type "dmesg -Hw" and connect your NanoVNA.
Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.).
Martin
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
|
Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Actual response is Invalid parameter, I think
toggle quoted message
Show quoted text
On Jan 27, 2023, at 6:00 PM, Al Waschka <awaschka@...> wrote:
?Hope this isn¡¯t considered off topic. It is about troubleshooting a NanoVNA.
Finally got the greml distro working. When I enter the string you suggested it says -H is unrecognized.
On Jan 27, 2023, at 6:07 AM, Ho-Ro <linuxaudio@...> wrote:
?On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:
I am trying to get my hands on a Liinux device to see how it responds in both
modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:
HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al,
You could download a "live" image, no installation required.
For your HW this small "rescue-linux" should be ok:
- Select the "grml-small" "32-bit PC" version, currently this one:
- Burn as ISO to a CD and boot the laptop from this CD.
- Then just type "dmesg -Hw" and connect your NanoVNA.
Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.).
Martin
|
Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
Hope this isn¡¯t considered off topic. It is about troubleshooting a NanoVNA.
Finally got the greml distro working. When I enter the string you suggested it says -H is unrecognized.
toggle quoted message
Show quoted text
On Jan 27, 2023, at 6:07 AM, Ho-Ro <linuxaudio@...> wrote:
?On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:
I am trying to get my hands on a Liinux device to see how it responds in both
modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:
HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al,
You could download a "live" image, no installation required.
For your HW this small "rescue-linux" should be ok:
- Select the "grml-small" "32-bit PC" version, currently this one:
- Burn as ISO to a CD and boot the laptop from this CD.
- Then just type "dmesg -Hw" and connect your NanoVNA.
Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.).
Martin
|
Re: NanoVNA H4 calibration anomaly
You nailed it. I was looking at S11 phase and not S21 phase. Thank you!
John W1FV
|
Re: Updating the firmware on a nanoVNA-H4 with a Mac
On Thu, Jan 26, 2023 at 02:46 PM, Lawrance A. Schneider wrote:
I there a similar usage of the dfu_util command for the nanoVNA - H4?
Lawrence, The dfu_util command works exactly the same for NanoVNA-H and -H4 as for tinaSA and tinySA Ultra. Both families use exactly the same STM32 processor (the small STM32-F072, the larger STM32-F303). Martin
|
Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade
On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:
I am trying to get my hands on a Liinux device to see how it responds in both
modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:
HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al, You could download a "live" image, no installation required. For your HW this small "rescue-linux" should be ok: - Select the "grml-small" "32-bit PC" version, currently this one: - Burn as ISO to a CD and boot the laptop from this CD. - Then just type "dmesg -Hw" and connect your NanoVNA. Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.). Martin
|
Re: Very compressed SWR scale #nanovna-h - Murphy
#nanovna-h
Murphy is a ham also¡. However he gets on the air and into my set very sporadically. Usually similar to the trouble shooting suggestions in the latest Ham Radio Workbench podcast. Remember to check the obvious. Don¡¯t assume anything. Even PL 259s and Anderson power connectors need exercising every so often to clean off the oxide and other stuff that electrons seem to attract. So opening up a 50 ohm standard on your Nano doesn¡¯t surprise me at all. 62 years in this hobby and still finding Murphy in my shack. All the ham radio license tests should have a Murphy question.
When I had teenagers in the shack I could expect anything but they have been gone for almost 30 years. My XYL of 51 years is afraid to enter the shack, even to clean, for fear she will be infected and waste more time in there since she knows how addicted I am to being there. I tell her my mistress lives in there¡.. then I duck and cover.
Dave K8WPE since 1960
David J. Wilcox¡¯s iPad
toggle quoted message
Show quoted text
On Jan 26, 2023, at 5:47 PM, Marc VK3OHM <vk3ohm@...> wrote:
?Thank you Owen Duffy for an off list suggestion. Turns out the 50 ohm load had failed open circuit, so it was not calibrated. Replaced the load and now working perfectly. Who'd have thought one of those could fail?
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Jim Shorney
Ho-Ro
David Wilcox K8WPE