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Re: QEX Magazine #tutorials
When you say "I will have a copy", do you mean you were given a photo copy of the article, or you personally made a photo copy of the article? OR, are you saying you paid for the QEX and are expecting
By Chris K2STP · #8753 ·
Re: quick measuring cable characteristic wave resistance
TDR
By larry36sat@... · #8752 ·
Re: Measuring impedance at the bottom end of a ladder-line-center-fed wire dipole
Yes, you are correct. At HF, it doesn't much matter how you connect the 50 ohm load. I have two 100 ohm carbon resistors in parallel that measure 50.1 ohms that I connect with alligator clips. For
By W5DXP <w5dxp@...> · #8751 ·
Re: Measuring impedance at the bottom end of a ladder-line-center-fed wire dipole
You can calibrate your measurement reference plane at a number of places. You can do your calibration at the SMA terminals of the NanoVNA. You can do your calibration at the ends of coax cables
By W5DXP <w5dxp@...> · #8750 ·
Re: errors of "error" models
[#96] : The Ultimate Criterion for Endless Reliable VNA Comparisons Hello, - - - - - - - - - - - - - (c) gin&pez@arg (cc-by-4.0) 2019 : start - - - - - - - - - - - Allow us, please, to announce that
By gin&pez@arg · #8749 ·
Re: Measuring impedance at the bottom end of a ladder-line-center-fed wire dipole
This is one of the big advantages of a small, self contained, unit. One can connect it to a balanced load or coax with little influence from surroundings ofr connection to a power source. During CAL.
By W0LEV · #8748 ·
F.S. VIRTUALLY NEW nanoVNA-F
For sale: Virtually new (2 weeks old) nanoVNA-F from the designer, not a clone. Working fine with VNA-SAVER under WIN7. $120 INCLUDES SHIPPING. SOLT components included along with the plastic snap
By Dale Parfitt · #8747 ·
Re: New NanoVNA-H just received
For sale: Virtually new (2 weeks old) nanoVNA-F from the designer, not a clone. Working fine with VNA-SAVER under WIN7. $120 INCLUDES SHIPPING. SOLT components included along with the plastic snap
By Dale Parfitt · #8746 ·
Re: On Line, Secure, Transactions
Or get one of those prepaid GreenDot Visa cards and just put in enough balance to cover your purchase needs. They supposedly work exactly the same as a regular card, albeit the additional overhead.
By nanovnagroup@... · #8745 ·
Re: New NanoVNA-H just received
Hi, any chance you could direct us to one of the ebay sellers that already have v3.4? Earlier I sent a message to Maggie inquiring about this but have not yet gotten a response, and not even sure she
By nanovnagroup@... · #8744 ·
Re: Measuring impedance at the bottom end of a ladder-line-center-fed wire dipole
erik, interesting video, which I will review at length another time. For the moment, I am trying to get a handle on an actual, physical system, to give myself a framework for understanding. The
By KI7MWA · #8743 ·
Re: F303 and 4" LCD for next generation NanoVNA #circuit #flash_size #improvement #enclosure #battery
Hugen, Looking forward to this version. When do you think it will be available? I'm trying to keep track of each version. Mike N2MS
By Mike N2MS · #8742 ·
Re: F303 and 4" LCD for next generation NanoVNA #circuit #flash_size #improvement #enclosure #battery
============================================================== Given hugen's history on this forum, he generally doesn't start making announcements until he feels his final prototype is ready for
By hwalker · #8741 ·
Re: Measuring impedance at the bottom end of a ladder-line-center-fed wire dipole
If you are interested in doing a detailed analysis you may be interested in how simsmith can help you Here is an excellent video explaining how to do impedance matching analysis including where the
By Erik Kaashoek · #8740 ·
Re: Measuring impedance at the bottom end of a ladder-line-center-fed wire dipole
For the moment, I'm just trying to understand what is going on, impedance-wise, with my antenna system. Not that I am having "problems" that need to be "solved," just curious. When operating, I will
By vaclav_sal <vaclav_sal@...> · #8739 ·
Re: Measuring impedance at the bottom end of a ladder-line-center-fed wire dipole
Practical measurement using a 1:1 balun, connected the nanoVNA to one side, other side to the ladder line of a half size G5RV. The ladder line does the impedance transformation to the dipole of the
By Erik Kaashoek · #8738 ·
Re: Measuring impedance at the bottom end of a ladder-line-center-fed wire dipole
When using a 1:9 transformer you should connect the nanoVNA to the "1" side and the ladder line to the "9" side. For calibration use a 450 ohm resistor (or a 470 ohm with a second resistor to make it
By Erik Kaashoek · #8737 ·
Re: Measuring impedance at the bottom end of a ladder-line-center-fed wire dipole
W5DXP, thanks again, good information. With regard to your previous post, and calibration at the "measurement plane." II understand correctly, this means conducting the SOLT calibration procedure with
By KI7MWA · #8736 ·
Re: Wait for V2 design or but current model on ebay?
Silly me!! I was not paying attention to ¡°PCB¡±... I was fixated on ¡°version¡±... Thanks for the info! -- Regards, Chris
By Chris K2STP · #8735 ·
Re: F303 and 4" LCD for next generation NanoVNA #circuit #flash_size #improvement #enclosure #battery
So how long off before this new unit is available for purchase? Weeks, Months, a year, years? -- Regards, Chris
By Chris K2STP · #8734 ·