Search found 37 matches

by HighSNR
Sun Sep 30, 2018 8:45 am
Forum: Antennas
Topic: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+
Replies: 14
Views: 34652

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Hi Phil, Good to hear that its interesting to people other than me. So you are aware of the likely timescales. I'm still awaiting the first prototype back from the fab. If it passes my initial testing I then need to send it over to the measurement lab for some proper testing. There is a risk that it...
by HighSNR
Wed Sep 12, 2018 8:18 pm
Forum: Antennas
Topic: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+
Replies: 14
Views: 34652

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Hi Phil, this is my antenna. It should work as a feed for a c band dish. To get optimum results you would need the beamwidth of the antenna to be matched to the diameter of the dish. Otherwise you risk loosing some gain with if the feed antenna spills over the sides of the dish. You might also consi...
by HighSNR
Fri Jul 06, 2018 7:53 am
Forum: Antennas
Topic: Antenna
Replies: 1
Views: 2573

Re: Antenna

Hi Charlie1, It really depends upon what frequencies and directivity you need. The RTL-SDR store here sells a dipole kit that would be ok for many tasks. This lets you adjust the telescopic elements to tune the frequency of operation. I also sell an ultra-wideband antenna on Tindie which optimised f...
by HighSNR
Sun Jun 17, 2018 7:34 pm
Forum: Antennas
Topic: new Broadband design dc to 25 GHz to a much wider bandwidth of 10 to 110 GHz.
Replies: 1
Views: 2168

Re: new Broadband design dc to 25 GHz to a much wider bandwidth of 10 to 110 GHz.

Well its hard for most DIYers to test the antenna at those frequencies, but you can probably make a fairly good eliptical monopole for lower frequencies(up to a few GHz). Obviously you need the kit to test and adjust it for optimum performance, but it will probably work well enough with guess work. ...
by HighSNR
Sun May 20, 2018 6:46 pm
Forum: Antennas
Topic: UltraWideBand antenna design
Replies: 18
Views: 10551

Re: UltraWideBand antenna design

Your cheap ADS-B antenna is will help filter out out of band signals. A bit like having a bandpass filter built in. With the UWB antenna there will be lots of other strong signals getting into the front end of the HackRF. This will lift the noise floor. The hackRF, while a great SDR for the money, i...
by HighSNR
Sun May 20, 2018 11:32 am
Forum: Antennas
Topic: UltraWideBand antenna design
Replies: 18
Views: 10551

Re: UltraWideBand antenna design

It should work pretty well for ADS-B Its not very directional below about 1.7GHz so it wont be good for Lband sigbals that need high gain. It would work ok for GPS or Iridium/thurays etc(i.e. systems that use a LEO or MEO satellite). I think INMARSAT normally works with a high gain antenna pointing ...
by HighSNR
Mon May 07, 2018 10:07 am
Forum: Antennas
Topic: UltraWideBand antenna design
Replies: 18
Views: 10551

Re: UltraWideBand antenna design

Hi, sorry for the delay. Its a 1/4-20 UNC thread. Its the standard thread for most tripods and cameras.
by HighSNR
Tue Apr 17, 2018 1:29 pm
Forum: Antennas
Topic: UltraWideBand antenna design
Replies: 18
Views: 10551

Re: UltraWideBand antenna design

So for those frequencies it should work well in the 3.1 to 3.4GHz band.

At 1.2 to 1.4GHz this antenna will work and is efficient, but doesn't provide any directionality over and above that of a normal dipole. Still useful IMO
by HighSNR
Sun Apr 15, 2018 4:01 pm
Forum: Antennas
Topic: UltraWideBand antenna design
Replies: 18
Views: 10551

Re: UltraWideBand antenna design

I'm not familiar with the frequencies airport radars use(other than the 1090MHz SSR/ads-b).

But my guess would be that it probably will.