Re: Definition of resonance
Thank you! That is good to know. Forgive me, but as old school and 73
years 'wise', I much prefer a hard copy.
Dave - W?LEV
--
*Dave - W?LEV*
*Just Let Darwin Work*
By
W0LEV
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#17537
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Re: Definition of resonance
Dave:
I may be mistaken, but I believe Jasik, Balanis and Krause are all available (in various additions) from internet sources.
Ed McCann
AG6CX
By
AG6CX
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#17536
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Re: Inexpensive source for RG-58 50 ohm coax, SMA connectors and/or preassembled?
My NanoVNA came with something more like 0.1" coax (RG-174 type or something).
Multitude of suppliers from companies you've never heard of. If you want more consistency, maybe try L-com
By
Jim Lux
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#17535
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Re: Inexpensive source for RG-58 50 ohm coax, SMA connectors and/or preassembled?
MPD Digital has an online custom cable assembly builder. They make cable
assemblies for NASA so it's good enough for me.
https://usacoax.com/custom.html
Dave-KB1PVH
Sent from my Galaxy S9
By
David Webb
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#17534
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Re: Inexpensive source for RG-58 50 ohm coax, SMA connectors and/or preassembled?
I bought these:
https://s.click.aliexpress.com/e/_dUxfrOB
https://s.click.aliexpress.com/e/_dURWBgb
I cut the second one to verify that it is a real
PTFE coax and it checks out.
Get a bit longer
By
Dragan Milivojevic
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#17533
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Re: Inexpensive source for RG-58 50 ohm coax, SMA connectors and/or preassembled?
Tonnes of options on amazon.
You can also try Universal radio, The Main Trading company, Gigaparts, pacParts.
You can buy 50 feet of RG58 on amazon for like $20. It usually has pl259 connecters so you
By
Colin McDonald
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#17532
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Re: Inexpensive source for RG-58 50 ohm coax, SMA connectors and/or preassembled?
"Cheap" RF cables breed nothing but problems. One might get away with
"cheap" RG-58 cables at HF, but NOT above 30 mhz!!!!! Don't tempt
problems!!!!!!
Dave - W?LEV
--
*Dave - W?LEV*
*Just Let
By
W0LEV
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#17531
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Re: Inexpensive source for RG-58 50 ohm coax, SMA connectors and/or preassembled?
I have had good luck with Chinese suppliers on ebay.
Bob
By
Bob Albert <bob91343@...>
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#17530
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Re: Definition of resonance
Section 13.3 of the Maxwell tertise states (NOT Clerk Maxwell of the famous
'4-equations' which tied EM theory together in the late 19th Century!!):
" The antenna tuner really does tune the
By
W0LEV
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#17529
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Inexpensive source for RG-58 50 ohm coax, SMA connectors and/or preassembled?
Can anyone tell me a source for inexpensive source for RG-58 50 ohm coax cable and/or for preassembled RG-58 with an SMA male termination on one or both ends, basically like that shipped with the
By
tjackson382000
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#17528
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Re: Definition of resonance
Yep!
"The antenna tuner really does tune the antenna to
resonance, in spite of opinions to the contrary of
those who are unaware of the principles of conjugate
matching. The tuner obtains a match,
By
Carey Fisher
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#17527
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Re: Definition of resonance
Hi! Interestingly, #1, Mr. Walter Maxwell (W2DU - SK) would disagree! (Reflections II, 13-3,
By
kurtt2000
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#17526
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Re: Definition of resonance
You can see the thermal noise from a human body, as long as it's against cold sky. (300K vs 20-30K Tsys)
You can also tell if it's overcast vs clear.
By
Jim Lux
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#17525
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Re: Definition of resonance
I suspect that a good Ku-band satellite receiver could easily
detect RF radiation from a car radiator at normal operating
temperature.
Dana
By
Dana Whitlow
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#17524
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Re: TDR Measurement
My experience of a "proper" TDR was demonstrated to me at an HF site where the TDR on an open-wire feedline showed the ceramic spacers and supports at regular intervals, and any breakdown that had
By
Bob G3REP
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#17523
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Re: NanoVNA vs. MFJ-259B Antenna Analyzer
Sorry, you had a bad experience.
I found my NanoVAN useful. Before I purchased mine I made sure it was a
good clone of the original NanoVNA. Plus, the unit I purchased was the
same one that another
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John VA3BOF
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#17522
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Re: TDR Measurement
I am finding that watching YouTube videos on the NanoVNA over and over again it is starting to sink in how to use the many features. Just take time to read and re read the instructions and watch and
By
David Wilcox K8WPE
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#17521
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Re: NanoVNA vs. MFJ-259B Antenna Analyzer
Well actually the difference between 'dumb' and 'normal' isn't that great.? All you need is an Elmer to show you the ropes.? Maybe even show you twice.? Then you will probably get excited and
By
Bob Albert <bob91343@...>
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#17520
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Re: NanoVNA vs. MFJ-259B Antenna Analyzer
I would like to see somebody make a "DUMB MODE: for the NanoVNA, and THEN it will really hurt the sales of MFJ analyzers. The "DUMMY" mode would be for peole like me, who are "dummy's"!!! ;-)))
It
By
Chris K2STP
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#17519
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Re: TDR Measurement
If you want a TDR, there's nothing like a proper TDR. I have a Tektronix 7904 with the 7S12 plugins (25ps resolution), but it's fragile and I don't use it much. You can measure the impedance of
By
Clifford Heath
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#17518
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