Re: danger measuring antenna
Yes, it was also something for the final DC block from the 6146 plate voltage to work against. Dave - W?LEV g3vgz-groups.io@...> wrote: -- *Dave - W?LEV* *Just Let Darwin Work*
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W0LEV
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#24037
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Re: danger measuring antenna
"David Eckhardt" <davearea51a@...> wrote: Manly to prevent dangerous voltages on the feedline due to breakdown in the plate capacitor leaking HT onto the feedline, essential on high power valve
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Brian D
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#24036
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Re: help with driver issue for a newbie
Hi Vladimir, Larry, and Group: Thanks so much for your advice. The references that you sent basically go in the direction of using the Cypress driver. I tried this, but to no avail - also get similar
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Ray
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#24035
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Re: Mosley traps measurements question
Search the group for "traps". Several posts on this topic. Roger
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Roger Need
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#24034
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Mosley traps measurements question
I wondered if anyone has measured Mosley traps with the NanoVNA? I have one on order. Currently I used a MFJ259c to try to get some results. I took the trap apart and put a 50 pica farad in series to
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K8HTB
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#24033
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Re: help with driver issue for a newbie
Dear Vladimir, Thank you for your suggestion. I will look into it today. 73 Ray 4X1RB From the home of Prof. Emeritus Raymond (Reuven) Boxman School of Electrical Engineering Tel Aviv University Cell:
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Ray
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#24032
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Re: Download NanaoVNA Labview
I have a lot of respect for the gentleman in question. He must be independently wealthy as he seemingly tests every multimeter in existence and then posts the results of his testing for FREE. I have
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Lawrance A. Schneider
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#24031
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Re: V2 SD card firmware
Hi DiSlord, numbering instead of random "RTC" naming is a great idea, but I understand it may not be easy to implement, need to add reading files and "logic". An updated fw v1.0.69 from 31.7 with
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Anton
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#24030
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Re: help with driver issue for a newbie
Thanks for the suggestion! I will investigate it later today.... Ray From the home of Prof. Emeritus Raymond (Reuven) Boxman School of Electrical Engineering Tel Aviv University Cell: ???? +972
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Ray
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#24029
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Re: Where does this noise/instability come from at and around 300MHz?
Just wondering if you hit the parts you're testing with a heat gun and/or freezing spray to see how how well the consumer level parts react.
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Larry Rothman
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#24028
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Re: V2 SD card firmware
DiSlord, For the V2 Plus units with no RTC, can the SDcard filenames be read and the next file saved has its last character incremented by one? This assumes a fully numeric filename so there are no
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Larry Rothman
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#24027
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Re: Where does this noise/instability come from at and around 300MHz?
This is the code I use to find the PLL min/max limits, but any desired code will do .. uint32_t si5351a_pllLocked(const uint8_t pll, const uint32_t timeout_us) { uint8_t pll_bit; uint32_t
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OneOfEleven
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#24026
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Re: Where does this noise/instability come from at and around 300MHz?
I've been using the Si5351 in another project and decided to test the chip at boot-up to find each individual chips (Si5351) possible PLL frequency range rather than having the 300MHz parameter be
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OneOfEleven
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#24025
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Re: V2 SD card firmware
Yes, old files will overwriting by new
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DiSlord
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#24024
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Re: V2 SD card firmware
If the file names can be repeated, can older files with the same name be overwritten or is there a "fuse" ? It's a small probability, though... Tono OM1AEG
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Anton
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#24023
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Re: Transform: Time Domain Band Pass
The Agilent app note is attached. Roger
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Roger Need
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#24022
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Re: Transform: Time Domain Band Pass
The link to the pdf file doesn't work for me. And looking again at the TDR menus, I would think that to measure coax cable length, opens and shorts the low pass impulse mode should be used. syd
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Syd <nhuq1@...>
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#24021
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Re: danger measuring antenna
A 2-watt carbon composition resistor has a rated breakdown of only 2 kV. Inductance really does not matter in this application as we're dealing with DC and slow bleed of possible accumulating
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W0LEV
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#24020
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Re: danger measuring antenna
One useful solution is to use a shunt resistor or a shunt inductor. Many antenna installations will include a resistor or a choke from the "hot" side of the coax to ground. The impedance of the shunt
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David Platt
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#24019
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Re: V2 SD card firmware
I'm glad to hear that the memory card worked, I also really missed this opportunity, so I implemented it for myself (but use different hardware, in it SD card already installed and 32768 xtal present
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DiSlord
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#24018
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