5 ms·
You still have to point it at things. I had the worst possible plot for my HF antenna which meant the lobes were in the wrong place for about 5 years :(
by baz00 3y ago
You still have to point it at things. I had the worst possible plot for my HF antenna which meant the lobes were in the wrong place for about 5 years :(
- ChuckMcM 3y agoBe careful not to confuse antenna design with "needing to point". :-) There are antennas with pretty circular gain in azimuth but asymmetrical gain in altitude. I have a 08-ANT-0861 from MP Antenna that pretty much looks every which way. And I can recommend it for people who need "one" antenna for a bunch of different experiments.
- baz00 3y agoQuick look of the datasheet suggests that's specified for three bands around UHF, VHF base stations. I mean I'm sure it'll sort of work outside those bands on receive to some varying degrees of success but on transmit, it's going to be a terrible terrible mismatch. Would love to see an S11 sweep on a proper VNA for that antenna. I bet it looks like a polynomial with a googol order. On some bands the feed might be a better antenna. My antenna comment was more about the launch angle. It was in inverted V which was steep aka a "cloud burner".
- ChuckMcM 3y agoFair enough, I've got an Agilent 8753A (3GHz version) that I can do an S11 sweep on. It that counts as a "proper" VNA :-) Drop me an email (contact is in my profile) if you would like me to send you a copy of it. (note it won't be right away as the bench is covered some different equipment at the moment)
- baz00 3y agoThat is about as proper as VNAs get :). Would be interested in that but will not share my email here as this is my trash account. If you can attach the sweep on imgur I can look at it there.