How to use dual band feed?

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2i0jmt
Posts: 65
Joined: Tue Apr 16, 2019 2:48 pm

How to use dual band feed?

Post by 2i0jmt » Sun Apr 28, 2019 11:42 pm

Hi Folks

I'm very new to Amateur Satellite, so I'm sorry that my question may seem very basic.

I've purchased an Octagon Green PLL LNB, and am currently awaiting for my 1m dish to arrive. Eventually, i'd also like to transmit, but I have no idea how to use the "copper pipe" type dual-band feeds, like this:

https://shop.amsat-dl.org/produkt/duoba ... il-2-p4-a/

Where does the LNB go? And which way round does the feed go?

Thanks

g0mjw
Posts: 2347
Joined: Sat Sep 20, 2014 9:15 am

Re: How to use dual band feed?

Post by g0mjw » Mon Apr 29, 2019 6:29 am

Read this https://uhf-satcom.com/blog/patch_antenna and also the latest CQTV

Mike

G8HKN
Posts: 52
Joined: Mon Jan 21, 2019 4:04 pm

Re: How to use dual band feed?

Post by G8HKN » Mon Apr 29, 2019 8:33 pm

Mike,
All the talk is about dual patch
I am hoping to use a separate 1.2 M dish for Datv transmission via qo 100
Is there a single band patch antenna
Maybe the one on page 40 of cq TV 263 ?
Could you confirm that a lhcp patch reflects at the dish to become rhcp
Roger G8HKN.

g0mjw
Posts: 2347
Joined: Sat Sep 20, 2014 9:15 am

Re: How to use dual band feed?

Post by g0mjw » Tue Apr 30, 2019 5:41 am

G3RUH does an excellent 2.4 GHz patch.

Mike

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G4IUG
Posts: 39
Joined: Fri Nov 23, 2018 6:28 pm

Re: How to use dual band feed?

Post by G4IUG » Tue Apr 30, 2019 1:21 pm

g0mjw wrote:
Tue Apr 30, 2019 5:41 am
G3RUH does an excellent 2.4 GHz patch.
Mike
Indeed he does and it's about 1dB better than the AMSAT-DL one. I have both.

Dave
Ex G6ANG/T and G8EAO

dh2va
Posts: 30
Joined: Tue Oct 09, 2018 10:00 am

Re: How to use dual band feed?

Post by dh2va » Tue Apr 30, 2019 3:17 pm

to be absolutely clear: the AMSAT-DL dualband feed is not (NOT!) compatible with PLL LNBs as it has an SMA coaxial connector for 10 GHz. It can therefore receive ONLY one polarisation and it needs special LNA/downconverter setups, not an LNB.

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