Re: Problem with eBay seller SV4401A: CAUTION11
#buying
Of course anyone¡¯s experience may vary, but over a period of years I have made purchased dozens of purchases from both AliExpress and Banggood. I have never had any issues with either group. However
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Larry McElhiney
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#30347
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Re: Problem with eBay seller SV4401A: CAUTION11
#buying
You are covered when you pay via PayPal. Lester B Veenstra K1YCM M?YCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1) lester@... 452 Stable Ln Keyser WV 26726 USA GPS: 39.336826 N
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Lester Veenstra
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#30346
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Re: Problem with eBay seller SV4401A: CAUTION11
#buying
Similar story on AliExpress out of China on a few orders. In this scam the vender would issue a FedEx tracking number that would show delivered, after some time. However, in conversation on line with
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Lester Veenstra
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#30345
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Re: Problem with eBay seller SV4401A: CAUTION11
#buying
I agree, Paypal is UNSCRUPULOUS, disagree?? Read the story about the guy that made a huge buy of 18650 li-ion cells and then got SCREWED by Pay@$#^ because they (Pay@#$^) wanted to hold the payments 6
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Mike C.
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#30344
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Re: Problem with eBay seller SV4401A: CAUTION11
#buying
Yes, I think we need to use payment methods that offer protection for unscrupulous sellers. And PayPal is a good example. ?n joi, 24 nov. 2022 la 00:33, John <ve3kkqve3kkq@...> a scris:
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Costin R
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#30343
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Re: Problem with eBay seller SV4401A: CAUTION11
#buying
I realize that this bit of advice is too late, but always buy from the OFFICIAL vendor. I had a similar experience with a "really good deal" on a Chinese VHF mobile radio. I was very excited to
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John
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#30342
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Re: Problem with eBay seller SV4401A: CAUTION11
#buying
Unfortunately, such situations have also appeared on Aliexpress. Fictitious tracking numbers, seen only by them. Shopping in China has become an adventure. The biggest loss I took was 120 USD, but I
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Costin R
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#30341
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Problem with eBay seller SV4401A: CAUTION11
#buying
I purchased a model SV4401A 8-inch VNA from eBay seller Hui3165 on Oct 24 because their price was much lower than any other supplier. I followed the tracking on SpeedPAK Standard from China to my
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Stuart Landau
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#30340
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Re: Determining OCFD total length and split points
#circuit
I ran some quick NEC models, results attached. The R doesn't change a lot until you get outside, say, 0.3 to 0.7 split point (0.5 in middle). This was a dipole "cut" for 10 MHz resonance. And the
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Jim Lux
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#30339
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Re: Determining OCFD total length and split points
#circuit
One might want a transformer (which could serve as a balun or RF choke) on an OCF dipole, because the resistive impedance at resonance is typically quite high, compared to 50 ohms. OTOH, if the
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Jim Lux
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#30338
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Re: Determining OCFD total length and split points
#circuit
The OCF set of wires is NOT a balauced (differential mode) source/load! Why use a balun? A balun is a circuit element intended to transform differential mode (dipole) to common mode (coax). An RF
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W0LEV
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#30337
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Re: #nanovna-saver
#nanovna-saver
Um sich abzumelden, klicken Sie auf den Link unten in dieser E-Mail, wo es hei?t: Unsubscribe
By
Bob Snyder <bob@...>
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#30336
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Re: Determining OCFD total length and split points
#circuit
You MIGHT be able to do it with 2 measurements. Use the TDR function to measure one section (lelement) and then the other section. I assume that you would have to reverse the NanoVNA's connection to
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DougVL
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#30335
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Re: #nanovna-saver
#nanovna-saver
Mein herzlichstes Beileid... Sie m¨¹ssen die emailgruppe verlassen damit da keine Mails mehr ankommen. Dg9bfc sigi Am 23.11.2022 11:12 schrieb "Peter, DG4EK" <info@...>:
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Siegfried Jackstien
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#30334
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Re: Determining OCFD total length and split points
#circuit
... You have to feed ocf with a 1 to 4 and a good choke Measure over a halfwave (or multiple of) cable (to see same resistance as on feedpoint). Easy as baking cakes. DJ0IP made several dozen ocfd
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Siegfried Jackstien
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#30333
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Re: Determining OCFD total length and split points
#circuit
Getting back to the original question - can you use the NanoVNA to determine where the feed point is in an offcenter dipole: NanoVNA can easily determine resonant frequency (where X=0). Onc
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Jim Lux
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#30332
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Re: Determining OCFD total length and split points
#circuit
Just to check ¡ª¡ª The resonant frequency of any dipole (center fed, OCF, or end-fed) is determined only but the TOTAL length of the wire, and not be WHERE you feed it. (And maybe how high above
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Barry K3EUI
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#30331
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Re: #nanovna-saver
#nanovna-saver
Bitte nichts mehr Schicken mein Mann ist Tod Am 19. November 2022 15:19:17 MEZ schrieb N4RFC <Bob@...>: -- Diese Nachricht wurde von meinem Android-Ger?t mit K-9 Mail gesendet.
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Peter, DG4EK
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#30330
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Re: Determining OCFD total length and split points
#circuit
this is a really good article on ocfd at various different places. seems you can select from about 20% to over 33%. All depends on your prefered frequencies.
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Jon-G0MYW
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#30329
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Re: Determining OCFD total length and split points
#circuit
OCFD puts the feedpoint at 5/8lambda from one end. That would be about 81-82ft for a 80m antenna. Stephen W9SK
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Stephen W9SK
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#30328
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