Cheap Wideband GHZ Antenna for Scanning? - Page 1
Forum section: electronics / rf-microwave

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 03, 2020, 04:27:18 pm
content: Hey GuysHere is my only Radio Stuff forum who I not got banned because I told them to stay in rule with the law and not tinker around with some Kw Amps on there CB Radios...I in some forum someone ask for something and I told him something and I was searching the known (European) Antenna Manufactures for interesting stuff and I found that Antenna:"1.5-6 GHz @ SWR ≤ 1.8 No tuning required"https://www.sirioantenne.it/en/products/cellular/sph-1-5-6-17Perfect for my HackRF who goes up to 4Ghz when I rember right.~35cm long fit into my Packpack perfectly. I would say the Gain at 1Ghz would be maybe some around 0dB?The most interesting Question is how about the Polarity of Ghz Signals?Can I pointing that in the Sky and get some Sat stuff since what I remember right is left or right Polarised?Sadly up in the Ghz Bands are nothing "that" interresting who could be decoded that easy. I saw the Antenna for ~70€ I guess so its not "that" waste of Money.Any useful recommendation?

author: spongella
author_rank: Contributor
timestamp: April 05, 2020, 11:27:50 am
content: Try a discone, some models cover up to 3 Gigs. Mine covers 25 MHz - 3 Gigs, the Diamond 3000N.

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 05, 2020, 12:32:11 pm
content: Its not very useful portable...

author: 9aplus
author_rank: Regular Contributor
timestamp: April 05, 2020, 01:48:04 pm
content: Or visit local IKEA and:https://hackaday.io/project/28119-biconical-dipole-antenna-ikea-cones

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 05, 2020, 09:14:45 pm
content: It look very bulky to. And where is a Building instruction? I cant find any.

author: james_s
author_rank: Super Contributor
timestamp: April 05, 2020, 09:19:46 pm
content: A really good wideband antenna is not likely to be compact or portable. I have a discone mounted on a mast that I use for my scanner, I've also been thinking of adding a yagi to cover some of the bands I listen to most often, the gain would be useful since there's a big hill on one side of my house anyway so not much coming from that direction.

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 05, 2020, 11:16:24 pm
content: At Home I have enough Antenna. I need just some Antenna for Scanning.

author: james_s
author_rank: Super Contributor
timestamp: April 05, 2020, 11:18:41 pm
content: Well you can't defy the laws of physics. Small antennas tend to perform more poorly, an antenna optimized for one band is going to not work as well in some other band, it's all a compromise. A decent quality "rubber duck" antenna works about as well as anything for portable use.

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 06, 2020, 07:07:41 am
content: I would like have a directional Antenna. Yesterday I was on a nearby Hill and the have various Antenna there. So with a directional Antenna I maybe catch some % of the radiation the radiate out.

author: 9aplus
author_rank: Regular Contributor
timestamp: April 06, 2020, 11:28:15 am
content: Quote from: Lord of nothing on April 05, 2020, 09:14:45 pmBuilding instructions are:1. buy two pots in IKEA in accordance to cat. numbers / or buy the next bigger size for lower freq.2. drill holes for N connector on the bottom one side3. drill one 3 mm hole on the bottom of the other side4. solder 3 mm screw on the center pin of N connector5. make some kind of center or side holder out of PE / can be also from kitchen cutting board6. adjust with changing of distance between two sidesPSThe only non "bulky" solutions for your taste, can be PCB versions of log periodic or vivaldi antennas....

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 06, 2020, 12:14:36 pm
content: QuoteI got this one:https://www.tindie.com/products/hexandflex/ultra-wideband-vivaldi-antenna-800mhz-to-6ghz/The work ok but is fragile.I dont have a AMP who goes that up.I also have the Patch Antenna who work either:https://www.rtl-sdr.com/testing-a-pcb-patch-antenna-and-radiosonde-qfh-antenna-for-inmarsat-and-iridium-reception/

author: 9aplus
author_rank: Regular Contributor
timestamp: April 06, 2020, 01:19:07 pm
content: Here using few LNA4ALL and LNA4HFLNA4ALL goes well up to 4 GHz

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 06, 2020, 01:58:25 pm
content: I will buy one from here:https://www.ebay.de/str/gpiolabs?_sop=15&_pgn=3&rt=nc

author: srce
author_rank: Regular Contributor
timestamp: April 06, 2020, 06:55:35 pm
content: Spiral?https://hexandflex.com/2018/11/11/spiral-antenna-part-3-results-and-suckers/

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 06, 2020, 07:32:00 pm
content: Is fragile to.

author: geggi1
author_rank: Frequent Contributor
timestamp: April 06, 2020, 07:51:28 pm
content: Have a llk at these antennas.https://www.wa5vjb.com/products1.htmlThey are reasonable in size and prize.

author: Lord of nothing
author_rank: Super Contributor
timestamp: April 06, 2020, 07:55:46 pm
content: I got some of that design from China.All bare PCB are fragile to...I snapped some in my Backpack.