POTY problem

Latest News and Discussion about the use of the DATV transponder on Es'hail-2
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g4bgq
Posts: 6
Joined: Wed Apr 22, 2020 1:01 pm

POTY problem

Post by g4bgq » Sat Apr 25, 2020 3:46 pm

I have an issue mounting my POTY feed to a Triax 1.2 mtr dish.
With the end sawn off the LNB and pushed onto the feed I cannot find the correct focal point.
It seems to be with the reflector touching the plastic mount or half way along the feed pipe.
Using an un-modified both NB and WD transponders are fine, but replacing with the modified one only the narrow tansponder is received at reasonable signals.
The wide transponder cannot be received despite being set to 12 volt horizontal.
My question may seem dumb but how do I get the feed to the correct focal point.

g4eml
Posts: 226
Joined: Thu Apr 26, 2018 9:36 am

Re: POTY problem

Post by g4eml » Sat Apr 25, 2020 4:02 pm

Because the POTY reflector is larger than a standard LNB it may not be possible to adjust it to the correct focal point without modifying your dish feed arm.

G8GKQ
Site Admin
Posts: 1674
Joined: Sun Mar 22, 2009 1:21 pm

Re: POTY problem

Post by G8GKQ » Sat Apr 25, 2020 4:09 pm

Lots of discussion about extending dish feed arms (for a different dish, but the principle is the same) here: viewtopic.php?f=101&t=6026

Dave, G8GKQ

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G1LPS Terry
Posts: 139
Joined: Mon Mar 10, 2008 10:33 pm

Re: POTY problem

Post by G1LPS Terry » Mon Apr 27, 2020 10:19 am

One thing that struck me was 12v for Horizontal.
The norm is 18v unless the lnb is rotated to the opposite polarity.

regards
Terry

g0mjw
Posts: 1170
Joined: Sat Sep 20, 2014 9:15 am

Re: POTY problem

Post by g0mjw » Mon Apr 27, 2020 10:40 am

g4eml wrote:
Sat Apr 25, 2020 4:02 pm
Because the POTY reflector is larger than a standard LNB it may not be possible to adjust it to the correct focal point without modifying your dish feed arm.
For most dishes this will be the case - just need to do some simple fabrication to get the modified LNB and lens to where the original LNB used to be.

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