The 10 Ghz Experiment Part - 3

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  • Опубликовано: 28 окт 2024

Комментарии • 18

  • @mikefinn2101
    @mikefinn2101 Год назад

    Great so much to learn thanks for teaching and sharing Skip. 73s Mike

  • @TheGmr140
    @TheGmr140 7 месяцев назад +1

    Very impressive experiment 😊😊

    • @VE6BGT
      @VE6BGT  7 месяцев назад +1

      Thanks for the comment, its a long term experiment for sure.. To busy being distracted by other projects to keep on this one.. But thats the hobby and its all fun.. Thanks, Skip

  • @tomstrum6259
    @tomstrum6259 Год назад

    Great job & exciting content Skip !! Thise type backyard dish & Ghz performance tests can Never be too long !! ......You could perhaps find a few more "Big Dish" 10 Ghz db signal by filling in the center section 6 --8 ft diameter area with Solid sheeting or very Fine mesh.....Never know 'till ya try it & not very $$ experiment.....With your different focal point F/D ratios reflectors, feed Horn Aperture Size optimization tweaking might find more signal......At 10 Ghz, there's certainly more Big Dish signal Leakage & inefficiencies to tweak out.....Keep putting up more videos.......

    • @VE6BGT
      @VE6BGT  Год назад

      Hello Tom and thanks for the reply.. Yes your right I could try sheeting in the center section of the big 21 foot dish, but.. I would have to rent a bucket truck to reach the center!! That would be the problem unless I was to winch the dish down, remove it from the mount and remove a section of screen material to fill it in etc.. Way to much work, besides it's just an experiment to compare for the fun of it.. The next part for this 10 ghz experiment is that I acquired a 6 foot solid fiberglass offset dish..
      I need to modify the stand for it to mount on and all the other things it needs.. It is in the shop to be worked on, just havent got to it yet.. Sort of catching up on other projects then back to it.. So stay tuned.. Skip

  • @ve7hr142
    @ve7hr142 2 года назад

    Great video Skip. Find yourself an Offset feed dish and do part 4 ;-)

  • @richardhowlett3271
    @richardhowlett3271 2 года назад

    Great work indeed. I am in theprocess of getting sorted on 3cm. Have a 1.8M PF with shephards crook feed all waveguide with 20W sspa. Currently seeing around 12dB sun noise. Love the noise meter.. is that one of your projects.. I'm a fabbywelder by trade so picked up some great ideas from your video. One day i can build a monster dish like yours. I will be working through your videos. 73 from Hobart

    • @VE6BGT
      @VE6BGT  2 года назад

      Hello Richard and thanks for the comments.. Your a welder! You wont have any issue building the dish system then.. I am just a old TV repair man, learnt to weld aluminum by hit and miss, turned out not to bad I guess.. Good on your 10 Ghz stuff.. Well I have all kinds of things on the go for that but have set it aside again for other projects that need to be finished.. I picked up a 6 foot offset dish this fall so that will be a project over the winter.. Yes the noise meter is one of my creations, I cant take all the credit though as its a design from others but it works very well.. I have two of them now, one for the IF of 144 and 432.. Both are great indicators..
      Heh if you want to go over some ideas with me look me up on QRZ for emailing direct... Skip

  • @wilfredswinkels
    @wilfredswinkels Год назад

    Hi Skip, Great video's! :-) I was asking myself, is the feedhorn illuminating the whole of the big dish? and is that why the big dish is showing the same noise figures as the small one?

    • @VE6BGT
      @VE6BGT  Год назад +1

      Hello Wilfred, I agree the feed horn launching section probably should have been different for the two types of dish f/d ratios... Like I said this was just a experiment and I wasn't going to get into it real deep as I should have maybe.. It was a pre test to the one I am working on now, a 5.9 foot offset fiberglass dish that will be the one I use.. I was just curious on what it
      would be like comparing with what I had on hand for hardware... Thanks, Skip

  • @wseanovostok
    @wseanovostok 2 года назад +1

    Good experiments and good results. I guess you can improve your RX system, using waveguided LNA connected directly to the feed. I use a 1.8 offset dish, WR-75 LNA with 0.7 NF, and I have 11.2 DB SN/G. 73 de ur3vke.

    • @VE6BGT
      @VE6BGT  2 года назад +1

      Hello Anton, yes it's interesting.. I like seeing things like this in real time rather than just theory or the numbers!! Skip

    • @wseanovostok
      @wseanovostok 2 года назад

      ​@@VE6BGT Agreed, I didn't have a chance to compare waveguided and SMA LNA, but it will be interesting to compare from your side.

  • @daviddavidson1372
    @daviddavidson1372 2 года назад

    Did that cover say von weise... those are some of the best. We used them on c-band dishes during my tvro installer days. We would run them up to the limit. Remove the 3 screws at the base and push it bac to expose the worn gear. Put some good grease inside. Would last forever...does the feed horn electronics not have an affect on the calculations? Are the 2 feeds the same...

    • @VE6BGT
      @VE6BGT  2 года назад +1

      That's correct a Von Weise.. You are right about them being the better ones.. I did the same TVRO work way back when and they never failed compared to others.. Plus if I remember ttey used ball screws in the worm section, not just a not and ACME thread.. IF I remember right ha ha... Skip

    • @defencebangladesh4068
      @defencebangladesh4068 2 года назад

      yes

  • @stargazer7644
    @stargazer7644 Год назад

    The results aren't too surprising when you consider the 6.5m dish has to have a surface accuracy of about three millimeters or better to come to good focus on 10 GHz. I suspect it flexes more than that under bending loads just from gravity. Plus the mesh is a bit larger than optimal.

    • @VE6BGT
      @VE6BGT  Год назад

      You are correct of course.. It was just an experiment to see what it was really like... Good to learn by real events sort of thing.. Thanks.. Skip