Field Day/Emcom coax stub filters(part2)

This video is a demo of the stub during Field Day. Using a dual band switchable stub to block the 2nd harmonic from our 40m CW station.
The 40m station is not using any band-pass or stub filters. My earlier video shows how to build this stub.
• Field Day/Em-com coax ...

[@spaceshantynow1851]

Cool! Just wrapped up Winter Field day and probably would have benefited from a filter like this. Thanks for showing it in action.

[@Inkling777]

Many thanks for reminding me of an idea I used years ago in a different context and haven't given enough attention in the years since. I was working at a USAF radar site that had multiple megawatts of pulsed RF from high-VHF to S-band. I became worried that might fry the front end of my 2-meter radio. To protect it I put in a stub that passed 2 meters but absorbed most of the rest of the spectrum. The result was no loss of signal on 2 meters and never a problem with my radio. --Mike, WA4MP

[@amrwhiskey3456]

I have had the same thought for a broadcastify receiver. I was going to use a uv5r but the front end is too weak and broad. My other vhf activity at home would overload the uv5r. I may give it a try. Sorry it took so long to reply, I have lots of video ideas but not a lot of time. I haven't
been active in a long while

[@Cx1rkUY]

hi friend, good video, a question. The distance of coax from the equipment to T is critical, or not? for Transmitting is my ask. 73

[@amrwhiskey3456]

It's not when using one stub, I'm still looking into using two stubs. I have found mixed info on that. Two stubs work better than one but placement of the second stub can be optimized. I need to study that some more. Thank You for watching. 73

[@Cx1rkUY]

@@amrwhiskey3456 thank you very much for your reply. i will take more information. 73 many thanks