Re: Horn for 3.4GHz


dave G8SFU
 

If the rules are the same as in our house the boss would say that should go on a skip. My stock answer is "stop swearing".
We don't use the sk.. word here.

If the parts are useful they should be used.

Regards.  Dave.   Sfu

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On 22 Jun 2021, at 18:38, Colin Ranson <g8lbs@...> wrote:

Dave, just retired a big triple toaster, its in the loft.....wonder if the missus will miss it ?

 

73’s   Colin.

 

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From: dave G8SFU via groups.io
Sent: 22 June 2021 16:13
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Horn for 3.4GHz

 

Also worth a look at toaster element supports. Often about 5inches square.

Dave g8sfu

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On 22 Jun 2021, at 14:53, Raymond Brooks <g8kps@...> wrote:

For Sheet mica look at microwave oven spears.

 

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of KENT BRITAIN
Sent: 22 June 2021 13:09
To: UKMicrowaves@groups.io; UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Horn for 3.4GHz

 

Hi Colin

 

I usually put the window between the horn and the WG Transition.    Much smaller piece and it's out of the weather.

I like to use a sheet of Mica, but that's for X-Band and higher.  Hard to find Mica sheet big enough for 9cm but the bits for the larger power transistors is OK 

 

 

Andy

 

 

 

On Tue, 22 Jun 2021 at 08:28, Gareth G4XAT via groups.io <g4xat=ntlworld.com@groups.io> wrote:

My local repeater GB3JV (DATV) (Petts Wood SE London) is pretty much LOS to me at home, so rather than tie up my Titanium PLL LNB I picked up a NOS Nortel DRO commercial unit. As it needs some form of weather protection I thought I might as well add some gain too. Using this software https://www.raytechx.com/antenna-calc I then designed a 3-D printed 10dBd horn, which came out like the picture. Interior surface finish has been improved by flat filing and I will then cover with aluminium tape. 
A couple of questions....
1. It seems very 'wide' compared to horns I've seen on 10GHz stuff - maybe why its 'only' 10dBd.
2. I have some PTFE sheet, would this be suitable as a gasket to keep the weather out of the LNB cavity, if not would HDPE from a milk carton work?
The horn sizes very quickly got very large (longer print time/too big for the printer) if I upped the target gain figure. I was surprised by this...not like adding a couple of elements to a yagi....
Comments welcome...
Gareth

 


--
Raymond G8KPS

 

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