MJW patch feed copper thickness?

Latest News and Discussion about the use of the DATV transponder on Es'hail-2
radiogareth
Posts: 315
Joined: Wed Jan 06, 2016 9:46 am

Re: MJW patch feed copper thickness?

Post by radiogareth » Fri Apr 12, 2019 7:30 pm

Mines 1.6, Still OK? What about double (or single) sided PCB material? FR4 not so good at 2.4? SRBP??
Soldering up tomorrow :-)
BTW, I've found perfect 3mm spacers - 4mm hex nuts (at least the ones I have). Three of them will do a lovely job :-)

Gareth

radiogareth
Posts: 315
Joined: Wed Jan 06, 2016 9:46 am

Re: MJW patch feed copper thickness?

Post by radiogareth » Sat Apr 13, 2019 5:12 pm

Got it all together and soldered it all in one lot with a gas torch and care! Rather than using a bulky compression fitting I put the completed feed in the lathe and took about 0.5mm out of the LNB end of the copper pipe. Then, using a strip of emery cloth, I reduced the external diameter of my LNB. It is now a nice snug 'twist-fit' in the end of the copper. To seat the Rocket internals at the right height I have left the protruding copper at 16mm in front of the patch. Will this be an issue I wonder? - without it being that length, the inner bit will move around at will?? I will design a simple step-up ring for mounting in my LNB holder, pop it on the 3-D printer to make and then trial-fit. Not got a long run from shack to dish so various options on the actual cable I'll use and where I put the amp.
All good fun :-)
Gareth
2019-04-13 18.08.42.jpg
2019-04-13 18.08.42.jpg (1.39 MiB) Viewed 434 times
PS the stray solder is from where I assembled it earlier, with something that wasn't a N-type and with the patch the wrong way round! Doh!!

g7ntg
Posts: 24
Joined: Sat Feb 17, 2018 7:07 pm

Re: MJW patch feed copper thickness?

Post by g7ntg » Sun Jun 16, 2019 9:20 am

I use 3mm backplate to carry a 7/16 socket - no problems with return loss at 25dB

g7ntg
Posts: 24
Joined: Sat Feb 17, 2018 7:07 pm

Re: MJW patch feed copper thickness?

Post by g7ntg » Sun Jun 16, 2019 9:26 am

62234571_2858900400792867_2585491538196824064_o.jpg
62234571_2858900400792867_2585491538196824064_o.jpg (467.07 KiB) Viewed 301 times

g0mjw
Posts: 888
Joined: Sat Sep 20, 2014 9:15 am

Re: MJW patch feed copper thickness?

Post by g0mjw » Sun Jun 16, 2019 4:06 pm

Looking at that Coax, I am worried about the power ratings!

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