2019年8月9日 · $\begingroup$ @BrianK1LI so, the QFH is supposedly an excellent antenna for satellite reception since it's truly omnidirectional for 180 degrees. I was thinking of using it to …

2024年1月27日 · So maybe I can convince myself that this allows you to go from an unbalance 50-ohm coax to the balanced feed that the QFH really should have. I'm not 100% certain on …

2023年6月28日 · Just finished building a QFH antenna to see if I can capture the new Meteor M2-3 and improve NOAA APT. I built it out of 1 1/4 inch PVC water pipe, and isolated aluminium …

Due to the construction complexity of a QFH antenna, I would consider a simple quarter wave ground plane antenna or a vertical 1/2 wave dipole as the ground antenna for this example. …

2020年1月25日 · Whilst the calculations using the calculator seemed to work well, instead of the intended 137.5MHz I found that my first QFH was tuned for 126MHz (made using speaker …

2019年8月18日 · QFH is a "wave antenna" that captures signal by being aligned with the propagation of the EM wave in space. Beverage antenna does a similar thing at MW/LW …

Hello! After getting mixed results with a v-dipole I decided to try making a qfh antenna, I followed the rough dimensions of another users qfh that I saw yesterday, intending to dial the specifics …

2024年5月19日 · My antenna qfh ke-137 that I want to use for noaa apt is more responsive on the 990 MHz then (-31db) compared to the 137 MHz (-8.42db).

2015年4月27日 · QFH antennas are actually reputedly one of the best antennas for not being effected by their surroundings adversely. That is why they are used on satellites. Lots of hams …

2022年6月28日 · Welcome to Reddit's own amateur (ham) radio club. If you are wondering what Amateur Radio is about, it's basically a two way radio service where licensed operators …