The old SHARP 0.3 LNB and prime focus question

Hi All .

It's been a while . Hope you're all well . OK . Here we go . When I got my 2.4 dish put up back in around 2007 the guy fitted a modified 40mm 0.3 SHARP LNB with a prime focus waveguide on it . See photos . My original SHARP was taken out in a lightening strike back in 2015 . At the time I had a new spare 40mm SHARP stored away , so I opened it up and moved the waveguide on to the new LNB . And that's where I am today . However , I now want to swap it for a dual LNB . Looking around I have been able to find an INVERTO C120 twin LNB flange type for about £50 including postage .

However . Here's my question . Given that I have this waveguide on my current LNB . Will I be able to swap it over to any 40mm type if I open it up ? I'm thinking that if the fittings are all the same , then I can just buy a current decent twin 40mm LNB . Open it up , and move the waveguide again . Really , what I need to know is if all the 40mm LNBs have the same physical attributes once you take the cap off . Hope you all understood that :)

Oh . And I know my cable needs changing . That's getting done when I swap the LNB :)

Sammy

Attachment 69706Attachment 69707Attachment 69708

I would think so, feedhorn fittings are pretty standard, however looking at your waveguide and feedhorn it doesnt seem to have the 4 standard screw holes that bolt the LNB onto it, so I think you would have to drill those yourself.

You do need to check if when you remove the feedhorn from the existing LNB that it does have the O ring inside it, if currently its not sealed with an O ring in a groove, then its never going to seal to the new C120 flange.

It might just be easier all round if you just buy a more modern prime focus waveguide that been designed to bolt to a C120 flange, I'm pretty sure they wont be expensive, but finding a new one maybe difficult, 2nd hand on our favorite action site might be your best bet.

Or you could just go down this route. Probably by far the easist option.

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https://www.ebay.co.uk/itm/256137313890?itmmeta=01J2JRM20RHRZPF72HQ15NRWRD&hash=item3ba2f93e62:g:V0IAAOSwjOBkrFtY&itmprp=enc%3AAQAJAAAAwBFrdRKC4DbFlSnd1wvxDW9lIiq%2F17LH1m4rVTj%2BgGd8%2BBcmFrYSCSKF3iUE4HaLG7sgblQ6xcb7jqTVcU6uIqfChgLAyJOElADBGI0Kaz1PXxx5Kqt8kK6h88SbmgesqggX0lZWU%2FOtTNjx0NW0Z%2BhygGczHnQMdzeh%2FkpW%2Fb52%2BXtxxoeE9zj4U49diYoIGFajY93Sx3T9j3n0ZWdU0CrwbqnVBhoWNh0ROFj%2FOIpvb%2BK8xDb7nNFHc2MTEoHJig%3D%3D%7Ctkp%3ABk9SR7ig0NiUZA

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Ian.

On my 2 meter Prime Focus dish i've been using Invacom C120 Adjustable Feedhorn with Scaler Ring and Inverto Twin Flange LNB C120 0.2db .

Example :

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https://www.orbitadigital.com/en/sat...s-adf-120.html

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https://www.satworld.ie/inverto-twin-flange-lnb.html

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This would cost a bit of money but its still a once off purchase and with a 2.4M dish i am certain it'd be well worth spending a bit to get best possible signals across the Arc .
Your current set up and LNB Holder looks totally ideal for that set up and a straight swap i see no issues as those pics you posted show its very easily possible to make happen .

As for Sat Cable i went for good quality Black CT100 Satellite Cable (100m) as its well suited for the very wet weather and we get plenty of that no shortage water here :thumb:

Good luck : )

Hi Ian ! How's it going . See you're still here :)

Thanks for replying . Yeah . I have another standard waveguide here (attached) with the 4 holes . To be honest I can't remember how my current waveguide connects to the SHARP . It's been almost 10 years since I opened it up . As you say the 4 holes aren't showing . Do all standard 40mm LNBs have the 4 holes once you remove the end cap ? I don't know . I really don't want to dismantle the SHARP again to look and see . It's had 10 years of pretty extreme weather and the plastic is probably pretty brittle . I might just bite the bullet and buy another new twin flange LNB . Once I've fitted it then I can maybe disassemble the SHARP again to see what's what .

Cheers !


Attachment 69710

All standard C120 LNB's have the 4 holes and the O ring seal with a grove that the O ring sits in.

It looks like your other waveguide will match perfectly to a C120 LNB.

Ian.

Hi barney . Think we were both posting at the same time :)

Thanks for the info !

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Originally Posted by ian

All standard C120 LNB's have the 4 holes and the O ring seal with a grove that the O ring sits in.

Ian.

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Yeah . I meant the standard 40mm Universal type LNBs . I can't remember what my SHARP looked like once I removed the end cap . Cheers

Well . New Inverto twin LNB fitted and new cable installed . Next I'm going to open up the SHARP LNB to see if I can use that flange feedhorn on other standard 40mm LNBs .

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