For a newbie, seeing the process of: attaching, setting up the nano parameters, reading and observation is really nice. Multiple examples are a great help. You operate with such confidence and verve. Well done.

Most of those filters are designed for a terminating impedance other than 50 ohms, hence the odd passband shapes you are seeing. It might be interesting to experiment with feeding them through series resistors so they see a higher impedance. That will likely clean up the passband shape on most of them. Start with a few hundred ohms on both ends. The 880 filter is obviously designed to work in a 50 ohm system.

You sure are having lots of fun with these two devices! I am learning so much that my head hurts now. Thanks, Carl

Thank you for your excellent videos. The knowledge you share is helping is helping curious ham radio operators advance. 73 Bret/AC0AE

the 45M is a crystal filer and definitely not matched to 50 ohm hence the very crappy response. The 114M is probably an inverse Chebyshev filter. It could also be a Bessel filter (if you could measure the phase response, it would show).

Filter from a cellphone. 880 is a cellular band. Possibly from a trunked radio in 800 MHz.

Really enjoy the VNA filter analysis!

That filter with the floatin pin would be a varactor diode in it to adjust the capacitance for fine tuning

Great video, thanks! I really like how you scavenge and repurpose parts. I’m going to start doing the same.

That 880MHz and 45MHz filter were probably removed from an old Motorola analogue cell phone. One of the car transportable type 4800x.

45 MHz can is probably an IF filter.

are there 2 traces? how set channel 1 then channel 2 on the new nano vnas? I keep getting logmag confused with actual signal strength.

ok what setup for pass thru? s11? s21? where is the second trace? how set traces, format etc? This thing makes little sense to me.

`So, I assume that you can look at IF cans for tube and transistor radios in the same manner with similar reliable results? Thanks for yet another awesome video. I spend half my time on the internet watching your videos.

Could the nanovna be used to confirm the function of a two band diplexer?

Just learning about the nanovna.. very kewl little bugger.. I have an H and it doesn’t connect to the pc,, shows a malfunction,,not recognized, Windows 7 or 10.. doesn’t matter, my question is is there a way to update the firmware even though it isn’t recognized by the USB ports,. It works from the screen. Just would be nice to connect it to the pc like my other H does,,thanks

Hi, nice video! But I wonder if nanovna should be calibrated on each frequency of DUT?

I am very interested in the 880MHz filter. Do you have any more information? Who makes it? I understand that it is three resonator sections but I don't understand if it only has orifices. Due to the dimensions they are very small even for 880MHz. I really wish I could build a similar one. I appreciate more information to get one of these.

Can you do a tutorial on setting up the NANO VNA from scratch to do these types of tests. I'd like to tune band pass filters for ham radio use. Thanks

It is very difficult to obtain some of these filters In my spectrum analyzer CMU200 R&S Yesterday he passed away on the RXTX board The filter Murata DFC3R836P025HHD BPF 836MHZ That's why my spectrum analyzer is like a doorstop right now I did not find the filter for sale at any supplier :(

Do you have a video on how to measure an antenna using a VNA?

Does the NANOVNA H describe a specific product, or is it a general term. I would like to get one of these, and I want the product you are using here. When I look at these on the internet there are so many. I will also be using the product for filter applications.

what is the difference between a concave flat and a rounded one

Is it generator and spectrum analyzer?

they don't have the skill set to do that RF stuff, they are just digital dummies.😁 Subscribed immediately.