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.
I was about to comment on that - proper terminations, without which the passband is distorted (unless, of course, they are Nanovna’s 50 ohms) - when I read your comment. Congrats.
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).
`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.
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
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.
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 :(
yes I have many videos measuring antennas. I have a playlist for the NANOVNA. here is one video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-u3EAZHIjo_A.html
@@IMSAIGuy I am trying to figure out how to connect a reflection bridge to an older VNA. I suppose DUT to the antenna and SWR output to the input of the VNA. When not connecting an antenna there seems to be no throughput thru the bridge. I thought from input to output that should have hardly losses.
@@egbertgroot2737 I'm not sure of your setup. normally a VNA has a bridge built in so why have an external one? do you have a VNA or scalar network analyzer? it it a real bridge or a directional coupler?
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.
it depends on application. sometimes you need the signal to stay constant and so you need a flat response. sometimes it is more important to have steeper sides, this usually results in dips and peaks
