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I use CMCs on two antennas; a dipole and a 1/4wave 2 meter vertical with counterpoises. But I have a third antenna, an off center fed dipole with a balun. I have assumed that the balun will also

Remember, I have preamp #1 ON. Virtually all my local noise originates from the SMPSs in our new appliances (2014). Our mountain home was burned completely down in the High Park Fire of 2012 here in

Mark, Indeed for a given voltage the current will be determined by reactance, or more correctly by impedance, and the permeability of the core material is one of the factors determining it. So, if

For those unbelievers in feedline chokes to properly treat CM energy on feedlines, I made some quantitative tests using my HF antenna and Icom 7300. So,...... have a read of the short attachment. I

Found my problem. Screen protector was wadded under case. Removed the front, cleared out the cover, boots fine. Thanks! wrote:

Does not help.

Try tapping the screen anywhere. I have no idea if this will work, but it may be required for proper boot. Dave - W?LEV -- *Dave - W?LEV* *Just Let Darwin Work*

I have 3 laptops, two running Windows 10, and one running Window 7. I was able to install the v1.0.39 firmware for my H4 nanoVNA on the Windows 7 laptop but not the Windows 10 ones. When I ran the

Mark pretty much covered why stacking cores of differing materials is a really bad idea. I've never tried it from day one as I understand the problems which Mark addressed. However, connecting CMC

Thanks very much for the reply, Jim. Ideally, the question of what happens when a Mix 31 and a Mix 43 core are bound together and turns wrapped through them would be answered by first solving

Could you increase the turns and re-measure? I'd like to see what happens since I need a CMC choke for a milti band antenna. These cores were stacked correct? I wonder about two in series, a 31 and a

Use the search function in the forum messages and you'll find my mesg with the link - I don't recall it offhand

Hi, Where do I find the above referenced "NanoVNA-App", I do not see this in the FILES section. I assume that this software makes it easy for a non-computer person to do the Firmware Update. Glen

Mark, KA2QFX: Thank you so much for your clarifications. Hopefully many will read it and gain a bit of knowledge and apply it over snake oil and hearsay! I'll confess I'm a bit jaded by the lack of

On 1/22/21 8:30 AM, Jim Lux wrote: > I think you'd need to look at the magnetic circuits. You've got two cores with different permittivities, so the flux will distribute unequally. So the real

On 1/22/21 8:19 AM, Jeff Anderson wrote: > On Thu, Jan 21, 2021 at 01:36 PM, Miro, N9LR wrote: > >> That would be asking for trouble, like having BJT (bipolar transistors) in >> parallel. On different

I'm wondering if there is any empirical data or theoretical derivations showing that paralleling ferrite cores of different materials is a bad idea. From a heating perspective, it seems to me that if

Some thoughts on Common Mode Chokes and Ferrites In reading the preceding responses I noted some comments that are easily open to misinterpretation. I’d like to address these, as I feel the

Since you don't say why you want one, or what you would use it for, here's my thoughts. If you are going to use it outdoors, get the NanoVNA-F. (There is just 'one' to choose from.) Frequency? Only

No problem. I think about all of the Smith Chart "How To" training articles I've read describe the half wave/full rotation characteristic. And it would be fairly obvious the first time I tried,