Re: Alibaba ordering
Thanks for the follow-up Chris. I ordered on Friday and pretty much followed the same procedure although I have not communicated with her since I sent the payment because they were already well into
By
W0PWE
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#9192
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Re: Bad Coax...feedback requested
Port 00 or Port 01, that used for one-port measurement of s11, may not be a good 50+j0 source over your frequency range. You exhibit everywhere better than 15 dB return loss which is pretty good, but
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W0LEV
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#9191
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Re: Alibaba ordering
Sorry, didn¡¯t notice your question till now. I started a chat with ¡°Maggie King¡± on the Alibaba site via hugans store on their. I simply let her know I would only purchase via a paypal payment.
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Chris K2STP
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#9190
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Re: Bad Coax...feedback requested
Additional info...it's a piece of 1.25" hardline, and the response is much worse going up in frequency; ~-5 return loss at 146 MHz.
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Robin Midgett
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#9189
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Re: Alibaba ordering
On Sun, Jan 5, 2020 at 11:22 AM, <nanovnagroup@...> wrote: > > Amazon has become a disaster. You never know from whom you are getting the > product even dough you might have purchased from a
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Chris K2STP
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#9188
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Re: Bad Coax...feedback requested
Most rf lines like low density foam has a spec return loss of about 20 db.
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Clyde Spencer
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#9187
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Re: Bad Coax...feedback requested
Did you put the load on the output of the VNA? This looks somewhat normal but the return loss is a bit marginal. I am curious about the return loss of the load by it self. Do you have the VNA saver
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Clyde Spencer
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#9186
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Bad Coax...feedback requested
I've calibrated my NanoVNA & connected it to an approximate 350' length of coax with a known good dummy load on the opposite end. The S11 plot is attached...not pleasing at all. Can anyone on the list
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Robin Midgett
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#9185
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Re: errors of "error" models
Hello again Erik; @ Erik... - /g/nanovna-users/message/9167 @ Erik... - /g/nanovna-users/message/9166 @ Jeff Anderson - /g/nanovna-users/message/9158
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Gary O'Neil
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#9184
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Re: errors of "error" models
I just see your comment, and since I happened to have a VNA calibrated, I stuck an Agilent short from an 85052B 26.5 GHz 3.5 mm calibration kit on the test port via a special adapter needed for this.
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Dr. David Kirkby, Kirkby Microwave Ltd
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#9183
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Re: NanoVNA Presentation
#measurement
#nanovna-saver
#tutorials
Thank you Luc, very helpful! Randy NC8U
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Pomology
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#9182
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Re: errors of "error" models
A slight clarification -- Hand was referring to errors that were *not* corrected with the error correction process. Noise is one of those errors. Imperfect characterizations of the standards are
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Jeff Anderson
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#9181
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Can't Upgrade Firmware
I cant upgrade my VNA-H FW 0.2.3-2 20191018 with new releases after October 2019 with DFuSe 3.0,6 from Google disk by two reasons: Have got Upgrade successfully with NanoVNA-H_20191125.dfu, but old
By
s_peter@...
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#9180
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Re: errors of "error" models
On Sat, Jan 4, 2020 at 10:11 PM, Gary O'Neil wrote: Hi Gary, > > "It is unbelievably incredible that, since its > invention, so much emphasis has been placed on VNA calibration with maximized >
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Jeff Anderson
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#9178
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Re: NanoVNA Presentation
#measurement
#nanovna-saver
#tutorials
Thanks Luc for taking the time to write and translate this document. Very well done... Roger
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Roger Need
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#9177
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Re: SMITH CHART TUTORIAL
From: KV5R Umm, I love to, but no... U.Kansas makes them publicly available (not restricted to student accounts), but re-packaging and posting them, without written permission, would not be
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David J Taylor
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#9176
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Re: Bi-Quad Antenna 430 MHz is this a good one?
#calibration
Where do you want the radiation to go? Biquads typically have strongest pattern broadside to the bowtie. Mounted flat on the ceiling, that would be primarily to zenith. Are you planning to communicate
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Bob KV4PC
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#9175
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Re: SMITH CHART TUTORIAL
Umm, I love to, but no... U.Kansas makes them publicly available (not restricted to student accounts), but re-packaging and posting them, without written permission, would not be appropriate or legal.
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KV5R <kv5r@...>
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#9174
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Re: NanoVNA Presentation
#measurement
#nanovna-saver
#tutorials
This will mainly interest the DUTCH speaking members I posted two videos on YouTube with my presentation on the NanoVNA Part one is about complex impedance, transmission lines, S-parameters and the
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Luc ON7DQ
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#9173
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Re: Alibaba ordering
Amazon has become a disaster. You never know from whom you are getting the product even dough you might have purchased from a specific seller and saw a specific picture of the item. If the sale is
By
nanovnagroup@...
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#9172
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