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Date
Nano VNA BASIC WORKSHOP via Zoom
The ¡°Five County Digital Training Net¡± (Philadelphia region) is hosting a series of Zoom Workshops on Monday evenings at 7-9 pm. The topic: Nano VNA Fundamentals All are welcome to join. Link:
By Barry K3EUI · #30255 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Sorry ... I meant to say: These parts are designed for turning on MOSFET gates so I suspect they stack as many photodiodes in series as they need to get the required voltage. Eamon
By Eamon Egan · #30254 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Here's one that will do 10V https://www.vishay.com/docs/84639/vo1263aa.pdf (it's far from the only one). These parts are designed for turning on MOSFET gates to I suspect they stack as many LEDs in
By Eamon Egan · #30253 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Apparently, those 1000V PIV (the 1n4008) *are* PIN diodes - something about the voltage rating - the 800V versions are not. However, there's some commentary about different manufacturers being
By Jim Lux · #30252 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Miro, yes, Elecraft uses such high voltage rectifiers as PIN diodes in several of their products. They use true PIN diodes in some others, and sometimes they even mix them. What kind of diodes they
By Manfred Mornhinweg · #30251 ·
nanovna_remote.py - Python tool for remote control of the NanoVNA-H from the PC #nanovna-h #scripting #python #nanovna-tools
Hi, as written just around the corner /g/tinysa/topic/tinysa_remote_py_python/94944540 there's a new tool in my toolbox:
By Ho-Ro · #30250 ·
Re: NanoVNA-H4 no longer measures SWR or Smith Chart
Dave - LogMag for S11 just sits there at 10db/0.05db no matter what connector i put on the unit, OPEN, SHORT or LOAD. It doesn't fluctuate at all. Smith Chart stays at -133mOhms 521nH. No fluctuation
By John Morris · #30249 ·
Re: NanoVNA-H4 no longer measures SWR or Smith Chart
Tom - I've ordered a couple to have on hand. Will take the one out. Thanks for the suggestion. John
By John Morris · #30248 ·
Re: NanoVNA-H4 no longer measures SWR or Smith Chart
Doug, i checked all the cables and popped the lid and checked inside for a cracked solder connection possibly. Took off the shield and checked that also. No problems that I could see. Thanks for the
By John Morris · #30247 ·
Re: New firmware features request - testing toroids ( I hope for . . . .)
Hello, The PDF file works fine for me also. Maybe you need to download it again? Clyde KC7BJE
By Clyde Lambert · #30246 ·
Re: HANDHELD CALCULATOR Scattering Parameter Routines
Mutiple parties interested. So for now spoken for... THANKS! Great not to send to the landfill.
By alan victor · #30245 ·
Re: NanoVNA-h4 stuck in DFU mode
Paul, thanks i tried this; was able to see the device in the DeFuse and it completed the update but the machine still acts like its in DFU mode.
By Eric KO4ZEK · #30244 ·
Re: NanoVNA-h4 stuck in DFU mode
tried this today and it did not fix it.
By Eric KO4ZEK · #30243 ·
HANDHELD CALCULATOR Scattering Parameter Routines
If you own or still use the ol HP 65/67/41C series RPN machines, I have a copy of Medleys microwave routines text. Routines include analysis and synthesis of networks driven by S data. If interested,
By alan victor · #30242 ·
Re: New firmware features request - testing toroids ( I hope for . . . .)
For me too Opens fine Dg9bfc sigi Am 11.11.2022 12:57 schrieb "Max via groups.io" <kg4pid@...>:
By Siegfried Jackstien · #30241 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Power MOSFETS are specified in terms of max Rdson. At high frequencies one must also include the drain/source capacitance as well as gate-drain and gate-source capacitances. Spice models typically
By Charlie Thompson · #30240 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Is this saying that they use 1N4007/5408 as PIN? If so, any details?
By Miro, N9LR · #30239 ·
Re: New firmware features request - testing toroids ( I hope for . . . .)
It opens fine for me. Max
By Max · #30238 ·
Re: New firmware features request - testing toroids ( I hope for . . . .)
On Thu, Nov 10, 2022 at 11:36 PM, Michael wrote: Michael - > > Found this a long time ago and not sure if this will be useful to anybody. See > attached. > Your "cross_ref_list.pdf" sort of opens -
By DougVL · #30237 ·
Re: New firmware features request - testing toroids ( I hope for . . . .)
What is needed is some kind of NTE/ECG/SK catalog for most of the makers/seller of core material. Found this a long time ago and not sure if this will be useful to anybody. See attached. Also, is
By Michael · #30236 ·