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Hi Jim/Dave, I too have used these mini-circuits limiters, mostly the ones in a higher range 20/30MHz to 3000 and 6000MHz on commercial SA's observing multiple 6MHz wide QAM carrier systems with 10 to

That looks like the ticket. One thing to check - if you put two signals in (with the sum of signals being < limiting threshold) is there any IMD. For NanoVNA, which is single frequency at a time, this

I will try it again ? thank you for the support, I thought i was doing something wrong

Seems like the cost of the protection device plus shipping pretty much equals the cost of the NanoVNA and more than the cost of a TinySA.? Max

Clear your calibration on the device, measure your standards while the device is in an uncalibrated state. Essentially check if your standards and device are functioning properly.

The device from MiniCircuits I sent out about 15-minutes ago is designed for the requested purpose. I bought one about 3 months ago. It is not a discounted product. Again, Minicircuits VLM-33W-2W-S+

I have always assumed that the "Not recommended for new designs" warning implied only that the part was old and planned for obsolescence by the manufacturer. That is important information if you are

Device from MiniCircuits: VLM-33W-2W-S+ URL: https://www.minicircuits.com/ Rated from 0.200 through 3000 MHz in a 50-ohm system. It's marketed as a spectrum analyzer protector. Dave - W?LEV wrote:

This part is still stocked at Mouser, Digikey, RS, Farnell, etc. Many thousands available. Not recommended for new (high volume) designs, but upgrading your nanoVNA is a no-brainer to me. Op 4-2-2022

So, I have noticed the device will connect in either of two ways. This can be seen in windows device manager. Depending upon whether the device is powered up in DFU mode, or just powered up normally

Good video, that. I wonder, though, how necessary that protection network is if you make it a point to ground the cable to the antenna to discharge static buildup, and you don't plan to leave the Nano

The Bourns part is more for telco and data applications. Ethernet, for instance, has a transformer isolation which is pretty robust to transients of short duration. I don't know that I'd use a part

I use a Hills Bros. "case" as in the photo.? The label is glued along only one vertical seam and so removes easily.? You'll have to clean up a little glue residue.? There's room for some padding

I missed the trigger voltage. The Infineon triggers at 6.1 volts and clamps at a lower voltage depending upon current. I'll look for an equivalent or order the Infineon. Mike N2MS

Last night I upgraded the firmware on my H4 successfully on my Win10 machine. I followed the instructions exactly as given in the Absolute Beginner's Guide, downloading Dfuse_Demo_v3.0.6 from the

Very different parts.? The Infineon part triggers at a few volts. The Bourns part triggers at 250V, and then clamps to 25V. By the time the Bourns part triggers, your front end is dead.

I checked this Infineon diode on Mouser and it shows "Not recommended for new design: <https://www.mouser.com/ProductDetail/726-101-ELE6327XTMA1> Has anyone used this Bourns part:

I get the same error,! I use the calibration assistant . If I do it with out the assistance I get the error . The software is the issue, if I do the device no problem. I cannot upgrade the firmware

Solved this problem a few years ago. I protected my nanovna V2.2 with a TVS diode: ESD101B102ELE6327XTMA1, a 5.5V TVS bi-directional diode from Infineon, 0.1 pF capacitance. Soldered directly at the

Search on "How not to damage your NanoVNA when measuring SWR" in Youtube. Good video basically TVS + Back to Back diodes, series resistor and good description of functions. Also applies to TinySA.