Recent content by derbysatellite

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    Horseshoe antenna works, bi-directional beam. stay tuned. 225nm

    I'll give it another go when i get the analyzer
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    Horseshoe antenna works, bi-directional beam. stay tuned. 225nm

    Had a go at this, made to 69mm,69mm and 138mm (1/4,1/4,1/2 wave) not very impressed.
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    Slim Jim antenna practical?

    so to finalize this test i also built the well know 8 legged spider to compare against the J-Pole and Slim Jim. All element lengths are 69mm as per tutorial on this forum. They all show very very similar reception range, but in my opinion the J-pole wins as its far simpler to build and just as...
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    Handy web site for antenna lengths

    Handy simple site: http://wxtofly.net/wavecalc.htm
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    Slim Jim antenna practical?

    Flightradar Antenna @ 30ft, Flightradar Pro Plus Stick VS USB DVB Unamped unfiltered Slim Jim @ First Floor level behind window.
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    Slim Jim antenna practical?

    Slim Jim after 2 days
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    AN121SA - Antenna Analyzer

    Now i've found this 1..... :rolleyes: https://www.aliexpress.com/item/33013909026.html?spm=a2g0o.detail.1000013.13.29f54856L8jGrv&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.128551.0&scm_id=1007.13339.128551.0&scm-url=1007.13339.128551.0&pvid=7a88ba64-b008-4bd3-8538-c0de36510c68 I don't...
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    AN121SA - Antenna Analyzer

    it would appear there is another version available https://www.ebay.co.uk/itm/2019-N2201SS-RF-Vector-Impedance-Analyzer-Antenna-Meter-Tester-137-5-2-7HMz/163109070262 Although the advert gives incorrect frequency range as this one is 1.1 Mhz to 1.3 Ghz so will cover all HF,UHF and VHF bands...
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    Slim Jim antenna practical?

    oh right... thanks for letting me know.
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    Slim Jim antenna practical?

    Thanks, worked. Now plotting on clean slate ;)
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    Slim Jim antenna practical?

    Ooooh lol, yeah sorry i am looking for planefinder settings. I wanted to start a fresh aircraft plot for this test :)
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    Slim Jim antenna practical?

    tried to edit /etc/rbfeeder.ini via SSH sudo nano /etc/rbfeeder.ini but doesn't open the file??? comes up with new file....any ideas as to why?
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    Slim Jim antenna practical?

    Ok,so after 25 hours of testing the J-Pole.
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    AN121SA - Antenna Analyzer

    Hi, just a quick question..... is the VNA AN121SA worth the money??? I can get 1 from ebay around £140 delivered Are they any good? my current VNA AW07A unfortunately doesn't go high enough. Thanks for reading ;)
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    Slim Jim antenna practical?

    after 12 hours using cheap'o ebay DVB stick un-amped un filtered I'll leave it running till 8pm tonight (another 12 Hours) then switch over and leave the Slim-Jim running for same time. I'm impressed with its performance so far, might run a test in a few days with it up a mast.
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