
NanoVNA application by OneOfEleven
#applications
I think many people, myself included, want to use the NanoVNA as a portable device, that doesn’t require an external computer. Working outside on antennas, one doesn’t want to have to mess around with
I think many people, myself included, want to use the NanoVNA as a portable device, that doesn’t require an external computer. Working outside on antennas, one doesn’t want to have to mess around with

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #18183
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Sensibly priced, although stupid connectors on test board
It was a genuine error to post the wrong link. Dave
It was a genuine error to post the wrong link. Dave

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #18071
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KIND REMINDER
That’s partially wrong. The Hz should *always* be written with the H in upper case. So the units of frequency should be mHz, Hz, kHz, MHz , GHz, THz etc. It is *not* correct to use mhz, hz, khz, Mhz,
That’s partially wrong. The Hz should *always* be written with the H in upper case. So the units of frequency should be mHz, Hz, kHz, MHz , GHz, THz etc. It is *not* correct to use mhz, hz, khz, Mhz,

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #18070
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Sensibly priced, although stupid connectors on test board
I don’t know why, but several companies have produced testboards using the U.FL connector, which is only rated for 20 matings. The prices for some have seemed silly to me. There’s now one on eBay at
I don’t know why, but several companies have produced testboards using the U.FL connector, which is only rated for 20 matings. The prices for some have seemed silly to me. There’s now one on eBay at

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #18061
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SOLT Error Theory
#calibration
I''m not disputing the accuracy of your mathematics, but IMHO, the reflections at thrus are far more of a *practical* problem than their losses. It is hard to measure the losses of typical thrus,  th
I''m not disputing the accuracy of your mathematics, but IMHO, the reflections at thrus are far more of a *practical* problem than their losses. It is hard to measure the losses of typical thrus,  th

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #18046
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SOLT Error Theory
#calibration
As a rough guide, you need the load to have a return loss of 10 dB higher than what you are measuring to get a measurement uncertainty of 1 dB. So a 30 dB return loss load will enable measurement of a
As a rough guide, you need the load to have a return loss of 10 dB higher than what you are measuring to get a measurement uncertainty of 1 dB. So a 30 dB return loss load will enable measurement of a

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17942
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New open source VNA released  excellent performance claimed
wrote: What a shame. What differentiates the NanoVNA from other VNAs like the VNWA from DG8SAQ, is the fact the NanoVNA is fully selfcontained. I have a VNWA here I have never used, as I could not st
wrote: What a shame. What differentiates the NanoVNA from other VNAs like the VNWA from DG8SAQ, is the fact the NanoVNA is fully selfcontained. I have a VNWA here I have never used, as I could not st

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17769
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A Good source for Calibrated Loads in formats other than SMA 
#calibration
I think "precision" is a bit of an exaggeration there. Several are transitioning from N to SMA, which have very different diameters, so significant shunt capacitance, as a change in transmission line
I think "precision" is a bit of an exaggeration there. Several are transitioning from N to SMA, which have very different diameters, so significant shunt capacitance, as a change in transmission line

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17599
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Definition of resonance
So is the circuit I published on another thread, with an inductor, a capacitor and two resistors resonant at all frequencies? The reactance is zero at all frequencies. IF these parameters are SAME and
So is the circuit I published on another thread, with an inductor, a capacitor and two resistors resonant at all frequencies? The reactance is zero at all frequencies. IF these parameters are SAME and

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17545
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What is the resonate frequency of this?
I don't know how to do it on an iphone  I will have to find out if its possible using the gmail app on an iphone. Dave
I don't know how to do it on an iphone  I will have to find out if its possible using the gmail app on an iphone. Dave

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17512
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What is the resonate frequency of this?
mac.com@groups.io> wrote: No, there’s no reactance at any frequency, not just DC. So you could argue that it is resonate at all frequencies. This makes my brain hurt, but not as much as thinking what
mac.com@groups.io> wrote: No, there’s no reactance at any frequency, not just DC. So you could argue that it is resonate at all frequencies. This makes my brain hurt, but not as much as thinking what

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17460
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SAAV2 with bad SMA's from Amazon and false battery run time
#adapters
#battery
I can't imagine most sellers would want to accept a return if someone has run a die down an SMA connector! I recently had a male SMA load from Minicircuits which was out of specification  the dielect
I can't imagine most sellers would want to accept a return if someone has run a die down an SMA connector! I recently had a male SMA load from Minicircuits which was out of specification  the dielect

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17457
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What is the resonate frequency of this?
yahoo.ca@groups.io> wrote: The circuit is more a curiosity than anything else. But it hopefully gets people away from the belief that the resonant frequency of a parallel turned is independent of the
yahoo.ca@groups.io> wrote: The circuit is more a curiosity than anything else. But it hopefully gets people away from the belief that the resonant frequency of a parallel turned is independent of the

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17371
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What is the resonate frequency of this?
yahoo.com@groups.io> wrote: The resonant frequency of a parallel tuned circuit does depend on the resistive losses, but for a series tuned circuit it does not. I believe that all the books aimed at pa
yahoo.com@groups.io> wrote: The resonant frequency of a parallel tuned circuit does depend on the resistive losses, but for a series tuned circuit it does not. I believe that all the books aimed at pa

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17370
·


What is the resonate frequency of this?
I don’t know how to do it on my iPhone. I use the gmail app. Someone worked it out. The result is that the impedance is real at all frequencies, so you could argue it’s resonate at all frequencies. 😢😢
I don’t know how to do it on my iPhone. I use the gmail app. Someone worked it out. The result is that the impedance is real at all frequencies, so you could argue it’s resonate at all frequencies. 😢😢

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17369
·


What is the resonate frequency of this?
mac.com@groups.io> wrote: That’s true for series connected devices, not parallel. As someone has shown, the impedance is purely real at all frequencies. G8WRB Dr. David Kirkby, Kirkby Microwave Ltd, d
mac.com@groups.io> wrote: That’s true for series connected devices, not parallel. As someone has shown, the impedance is purely real at all frequencies. G8WRB Dr. David Kirkby, Kirkby Microwave Ltd, d

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17368
·


What is the resonate frequency of this?
This will be difficult to draw in an email, so I will describe it, too ——— R ——C——   X—— ——— X   ——— R —— L — 1) C in series with R 2) L in series with R 3) Networks 1 and 2 above are in parall
This will be difficult to draw in an email, so I will describe it, too ——— R ——C——   X—— ——— X   ——— R —— L — 1) C in series with R 2) L in series with R 3) Networks 1 and 2 above are in parall

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17255
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Dipole length
yahoo.com@groups.io> wrote: I would disagree with that  it would also be ABSOLUTELY correct if the reference impedance was 5000x100=500000 ohms. 😂😂😂😂😂😂 But both in amateur radio and professional RF e
yahoo.com@groups.io> wrote: I would disagree with that  it would also be ABSOLUTELY correct if the reference impedance was 5000x100=500000 ohms. 😂😂😂😂😂😂 But both in amateur radio and professional RF e

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17129
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Dipole length
A fullwave dipole being an obvious example. At resonance, the VSWR is around 100:1.
A fullwave dipole being an obvious example. At resonance, the VSWR is around 100:1.

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17114
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Dipole length
yahoo.com@groups.io> wrote: I wish people would give the source of the information. The behaviour shown looks quite believable to me. One can show that the mutual impedance between dipoles follows a s
yahoo.com@groups.io> wrote: I wish people would give the source of the information. The behaviour shown looks quite believable to me. One can show that the mutual impedance between dipoles follows a s

By
Dr. David Kirkby, Kirkby Microwave Ltd
· #17111
·
