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Firmware update advice, last done in late 2019
LOL thanks I had completely forgotten that! Been too long since I frequented the forum.
LOL thanks I had completely forgotten that! Been too long since I frequented the forum.
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Bruce KX4AZ
· #21321
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Firmware update advice, last done in late 2019
The only Dislord firmware folder I see in the file section is for nanovna-H & H4. Are those usable with the orginal nanoVNA?
The only Dislord firmware folder I see in the file section is for nanovna-H & H4. Are those usable with the orginal nanoVNA?
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Bruce KX4AZ
· #21319
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Firmware update advice, last done in late 2019
I bought a couple of the original nanoVNA devices in the fall of 2019. Shortly thereafter, I upgraded the firmware for one of them to a newer version that came out with a higher frequency limit (1500
I bought a couple of the original nanoVNA devices in the fall of 2019. Shortly thereafter, I upgraded the firmware for one of them to a newer version that came out with a higher frequency limit (1500
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Bruce KX4AZ
· #21317
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Through calibration with 75 ohm coax piece?
I'd like to do check the attenuation loss in some old & weathered RG-6 (75 ohm) cables for the TV signal frequencies. The nanoVNA seems perfect for that, however given the impedance mismatch (50 ohm c
I'd like to do check the attenuation loss in some old & weathered RG-6 (75 ohm) cables for the TV signal frequencies. The nanoVNA seems perfect for that, however given the impedance mismatch (50 ohm c
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Bruce KX4AZ
· #12780
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Power limit for "load" piece from the OSL set?
Thanks all for the sage advice, and yes, I do have some cheap dummy loads on order from Amazon - but darn it they only had overnight delivery for a shipping option - lol. So yes, my impatience overcam
Thanks all for the sage advice, and yes, I do have some cheap dummy loads on order from Amazon - but darn it they only had overnight delivery for a shipping option - lol. So yes, my impatience overcam
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Bruce KX4AZ
· #7870
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Power limit for "load" piece from the OSL set?
I am tempted to re-purpose the 50 ohm calibration piece from the OSL set as a "dummy load" when testing a low power (300 mW) RF transmitter. Does anyone have any idea what the power dissipation limit
I am tempted to re-purpose the 50 ohm calibration piece from the OSL set as a "dummy load" when testing a low power (300 mW) RF transmitter. Does anyone have any idea what the power dissipation limit
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Bruce KX4AZ
· #7862
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How will you use your nanoVNA?
Using it almost daily for antenna measurements on homemade dipoles, coax line loss testing, RF attenuator testing, band stop filter testing, and on and on. Recently I started using Cat5 ethernet cable
Using it almost daily for antenna measurements on homemade dipoles, coax line loss testing, RF attenuator testing, band stop filter testing, and on and on. Recently I started using Cat5 ethernet cable
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Bruce KX4AZ
· #5551
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Preamp noise figure (NF) measurement?
I am wondering if the nanoVNA could be used to measure the noise figure for a preamp. If it could, I am assuming it would use S21 results in some manner.
I am wondering if the nanoVNA could be used to measure the noise figure for a preamp. If it could, I am assuming it would use S21 results in some manner.
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Bruce KX4AZ
· #3941
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This is the most active group/list I subscribe to
Don't forget there are account settings where you decide whether to receive an email for every individual post, or a single digest each day, or no emails etc etc. I receive a daily digest, but I seldo
Don't forget there are account settings where you decide whether to receive an email for every individual post, or a single digest each day, or no emails etc etc. I receive a daily digest, but I seldo
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Bruce KX4AZ
· #3518
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Step attenuator testing versus dynamic range
All, Thanks for the excellent information - so it does sound like step attenuator leakage is the culprit....which is not at all surprising given that it is a very cheap one ($40) that I purchased on E
All, Thanks for the excellent information - so it does sound like step attenuator leakage is the culprit....which is not at all surprising given that it is a very cheap one ($40) that I purchased on E
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Bruce KX4AZ
· #3286
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Step attenuator testing versus dynamic range
I have a step attenuator with a series of switches (1-20 dB assorted values) that can be combined for (in theory) up to 80 dB total attenuation. Measuring the S21 individually, the 1,2,3,6,10,and 20dB
I have a step attenuator with a series of switches (1-20 dB assorted values) that can be combined for (in theory) up to 80 dB total attenuation. Measuring the S21 individually, the 1,2,3,6,10,and 20dB
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Bruce KX4AZ
· #3277
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Firmware font size - 2 versus 4 trace
Erik, Thanks for confirming memory capacity is a factor in the font sizes. My progressive bifocals work fine with the smaller fonts, but I imagine it's just a matter of time before someone releases a
Erik, Thanks for confirming memory capacity is a factor in the font sizes. My progressive bifocals work fine with the smaller fonts, but I imagine it's just a matter of time before someone releases a
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Bruce KX4AZ
· #3019
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Firmware font size - 2 versus 4 trace
I like the new 1500 MHz firmware - but I do miss the larger font size of the original 2 trace "antenna analyzer" version my nanoVNA shipped with. Wondering if there is some inherent reason why the lar
I like the new 1500 MHz firmware - but I do miss the larger font size of the original 2 trace "antenna analyzer" version my nanoVNA shipped with. Wondering if there is some inherent reason why the lar
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Bruce KX4AZ
· #3009
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NanoVNA Saver
Rune, Wanted to add my thanks for all the work you have done with the software, and I really appreciate the features added to the latest version. I've never been able to do a calibration within the so
Rune, Wanted to add my thanks for all the work you have done with the software, and I really appreciate the features added to the latest version. I've never been able to do a calibration within the so
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Bruce KX4AZ
· #3007
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Evaluating clamp on ferrite chokes
Mike, Thanks for the comment - I think you are absolutely right about that for HF. In my case, the ferrite chokes were mainly tried with the wall wart power cord going into a Tivo DVR, and I tried to
Mike, Thanks for the comment - I think you are absolutely right about that for HF. In my case, the ferrite chokes were mainly tried with the wall wart power cord going into a Tivo DVR, and I tried to
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Bruce KX4AZ
· #2993
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Evaluating clamp on ferrite chokes
Thanks all for the replies with detailed information, and also the links, which provide a treasure of information. It looks like the nanoVNA will be extremely helpful in looking at the snap-on ferrite
Thanks all for the replies with detailed information, and also the links, which provide a treasure of information. It looks like the nanoVNA will be extremely helpful in looking at the snap-on ferrite
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Bruce KX4AZ
· #2937
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Saving results without a PC?
I am finally understanding the concept of calibrations and saving the settings/range in the nanoVNA. But I am wondering if there is any way to save results from out in the field and then recall/displa
I am finally understanding the concept of calibrations and saving the settings/range in the nanoVNA. But I am wondering if there is any way to save results from out in the field and then recall/displa
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Bruce KX4AZ
· #2928
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Evaluating clamp on ferrite chokes
Just so I understand, would I connect only the outer shield to the center pin of the two ports, leaving the center of the coax floating unconnected?
Just so I understand, would I connect only the outer shield to the center pin of the two ports, leaving the center of the coax floating unconnected?
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Bruce KX4AZ
· #2906
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Evaluating clamp on ferrite chokes
Wondering if anyone has tried to use the nanoVNA to evaluate the properties of the clamp on ferrite chokes that are employed to reduce radio frequency interference (RFI) being emitted by wall wart swi
Wondering if anyone has tried to use the nanoVNA to evaluate the properties of the clamp on ferrite chokes that are employed to reduce radio frequency interference (RFI) being emitted by wall wart swi
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Bruce KX4AZ
· #2886
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Advice sought on specific measurement.
For evaluating cables I normally just do a S21 log measurement, which is somewhat of a "catch all" test for losses due to impedance problems, cable defects etc. I only calibrate with a "through" measu
For evaluating cables I normally just do a S21 log measurement, which is somewhat of a "catch all" test for losses due to impedance problems, cable defects etc. I only calibrate with a "through" measu
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By
Bruce KX4AZ
· #2843
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