Dish Feeds
Dish Feeds
This afternoons project was a dual band feed based on DJ7GP design.
I am pleased with the match.
I won't know how well it actually works until I try it of course.
I am pleased with the match.
I won't know how well it actually works until I try it of course.
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- Dual_Band_Feed_Match.jpg (293.44 KiB) Viewed 7029 times
Re: Dish Feeds
Here is my effort.
Response is pretty much identical to Mikes.
regards,
Paul EYT.
BTW I have the CAD files for this so its literally a 10 minute job to cut out the reflector / driven element.
Response is pretty much identical to Mikes.
regards,
Paul EYT.
BTW I have the CAD files for this so its literally a 10 minute job to cut out the reflector / driven element.
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Re: Dish Feeds
CAD files, yes please. Any interest in a few blanks, I could arrange some laser or waterjet cut discs.
Gareth
Gareth
Re: Dish Feeds
You are aware, that the plastic cap is not a rain protection but should be a dielectric concentrator?
Re: Dish Feeds
Yes - that's why it's there. I wish there was an easy way to get them without cannibalising a rocket LNB. Apparently some of these rocket LNBs have PLLs but not the ones I have received.
It seems to work - not too badly.
Last edited by g0mjw on Mon Dec 17, 2018 3:04 pm, edited 1 time in total.
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Re: Dish Feeds
A simple job for 3-D printing assuming we could work out how either PLA, PETG or ABS would behave. Other plastics possible too, like nylon. Happy to CAD and print something to experiment with if it helps.
Gareth, G4XAT
Gareth, G4XAT
Re: Dish Feeds
Just asking.. it looks completely different to the original design by DJ7GP. But he would know the details.
Re: Dish Feeds
How does it look different? It is the same design. He had a different dielectric lens I think but that's all.
Mike
Mike
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Re: Dish Feeds
A bit of goggling found this article: https://ieeexplore.ieee.org/stamp/stamp ... er=7637125
I understand all the 3-D printer speak and have a printer equal/better than the Replicator 2x mentioned. If someone can work the maths and provide dimensions, I'll happily CAD it and make some.
LMK
Gareth, G4XAT
I understand all the 3-D printer speak and have a printer equal/better than the Replicator 2x mentioned. If someone can work the maths and provide dimensions, I'll happily CAD it and make some.
LMK
Gareth, G4XAT
Re: Dish Feeds
Sorry to be unclear:with 'different' I mean 'not identical' . I would assume that shape and material are critical for the resulting beamwidth, just like in optics.
https://www.darc.de/der-club/distrikte/ ... 24-10-ghz/
But comparing its G/T to a standard LNB by checking the Astra 2C beacon (as example) should confirm its performance. It would be certainly one of the nicest designs I have seen and my personal favourite.
https://www.darc.de/der-club/distrikte/ ... 24-10-ghz/
But comparing its G/T to a standard LNB by checking the Astra 2C beacon (as example) should confirm its performance. It would be certainly one of the nicest designs I have seen and my personal favourite.