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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 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
You can stack them for higher voltages. The DC isolation lets you do that. Yeah, filtering for a specific application would be application specific.
By Jim Lux · #30235 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Jim, yes, ready-made DC-DC converters are inexpensive these days, and are a good option in many applications. But for RF switching, I don't see the one you linked as very usable. 15V is definitely not
By Manfred Mornhinweg · #30234 ·
Re: New firmware features request - testing toroids ( I hope for . . . .)
I found this data a year ago - "The easiest way to identify most ferrite materials is to wind about four turns of wire through the core and then measure the lowest frequency at which the value of
By DougVL · #30233 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
I'd buy an isolated DC/DC integrated converter something like Cui PQME1-S12-S15-M -- 12V in 15V out. $5 each You can also get the 5V in. So you can
By Jim Lux · #30232 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Don, I have seen that RF rectification technique used to bias switching diodes. But personally I don't like it much, at least not generally. Maybe in a specific application. Bias development by that
By Manfred Mornhinweg · #30231 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Gary, that was an interesting read! But if I understand integrated SOI FETs correctly, then they have no body diodes, and very low capacitances! So the main two problems of common MOSFETs for RF
By Manfred Mornhinweg · #30230 ·
Re: New firmware features request - testing toroids ( I hope for . . . .)
Try it with some known cores first. -- John AE5X https://ae5x.blogspot.com/
By John AE5X · #30229 ·
Re: MOSFET as RF on/off switch and how to measure/what to expect #circuit
Often a voltage doubler or tripler is used to "steal" some of the incoming RF, rectify it, and derive a high bias voltage that way, which will always be high enough to avoid conduction, since it will
By Donald S Brant Jr · #30228 ·
Re: New firmware features request - testing toroids ( I hope for . . . .)
Again, Fair-Rite has a wonderful YouTube presentation that outlines how to determine the mix of a ferrite. There's also a lot of additional information which may be quite useful. Visit the Fair-Rite
By W0LEV · #30227 ·