Re: Ground noise on 23cm?
Neil Smith G4DBN
I've used one of John's filters for ages. Through loss is tiny,
something around 0.15dB increase in NF when I put it in front of a
DDK preamp on my HP8970B compared with an SMA barrel connector.
I am 51km LOS from Emley Moor and there are no cellphone masts within 2km, but the problem was severe. I had about 15 noise spikes in many directions before I added the interdigital filter. It has SMA connectors.
On 17/09/2020 10:05, Anthony Coldman via groups.io wrote: