DIY QFH Antenna troubleshooting

Discuss commercial and home made antennas.
AnomalySmith
Posts: 15
Joined: Sun Jul 10, 2016 1:41 pm

Re: DIY QFH Antenna troubleshooting

Post by AnomalySmith » Sun Jul 24, 2016 6:07 pm

Hi,

Some news, I finally got the proper settings (I guess) to pick up the signal.
Results are not perfect but much better than the last time.

Here are some images from NOAAs satellites. You could see I experience some lag due to my laptop.

I noticed turning the antenna resulted in changing pretty strongly the signal reception (bands in images). Is that normal? Antenna is about 2m above ground and has an almost clear horizon to horizon view (N-S).

Thanks!
Attachments
Capture d'écran de 2016-07-24 18-58-17.png
Capture d'écran de 2016-07-24 18-58-17.png (390.25 KiB) Viewed 22569 times
NOAA_15_24072016_1847.jpg
NOAA_15_24072016_1847.jpg (1.2 MiB) Viewed 22569 times
NOAA_15_24072016_1847_T.jpg
NOAA_15_24072016_1847_T.jpg (814.79 KiB) Viewed 22569 times

Phillipo72
Posts: 2
Joined: Fri Aug 24, 2018 8:10 pm

Re: DIY QFH Antenna troubleshooting

Post by Phillipo72 » Fri Aug 24, 2018 9:11 pm

Your results are looking good. I have skipped a few posts but i registered to share my experiences with NOAA sats. I have found building QFH antennas to be very a temperamental exercise, especially when using cheap sdr dongles. The minimal interference shown on your last pic is to be expected. I suffer from huge drop-outs due to pager transmitters which are found at several frequencies some of which are very close to the sat frequencies. I used to get more consistency when i used a scanner to receive the analogue sats, definitely worth considering if your budget can stretch to a cheap scanner

Phillipo72
Posts: 2
Joined: Fri Aug 24, 2018 8:10 pm

Re: DIY QFH Antenna troubleshooting

Post by Phillipo72 » Fri Aug 24, 2018 9:13 pm

I just realised how old this thread is

jmcc
Posts: 4
Joined: Mon Jan 30, 2017 12:59 am

Re: DIY QFH Antenna troubleshooting

Post by jmcc » Wed Dec 26, 2018 12:44 pm

The balun might be an issue as it looks like the copper used is raw and not enamelled copper wire. This means that the coil could theoretically be shorting out if any of the turns are touching.

Post Reply