[NLRS] [BC'ers] Give away + Need advice on DirecTV dishes

[Dr. Gerald N. Johnson]

The Vivaldi that Kent sells is 10-25 GHz, not very useful on 3.4 GHz. 
His PCboard log periodic that does cover 2.1 to 11 GHz has less gain and 
I think the spill over the sides of the dish will be great, hurting the 
transmit gain and the receive signal to noise ratio. The dish will 
concentrate the received signal on the feed, but the feed will see noise 
sources like hot earth from the spillage.

You could make a Vivaldi for a lower frequency range, just make it 3 
times the size of his 10-25 GHz and it has better gain than the LP, but 
still may spray RF past the edges of the dish and pick up some noise 
sidelobes. It is possible to array Vivaldi's but it gets messy.

73, Jerry, K0CQ

On 6/6/2013 7:55 PM, David Palm wrote:
> I have a bunch (like 10) DirecTV dishes with feeds.
>
> I am going to be in White Bear Lake, MN on Monday - Wednesday of next
> week.  *Anybody who wants one (or more), please let me know and I'll bring
> one up.*
>
> In terms of my own use, I was thinking of keeping two, one to optimize for
> 10 GHz per the discussions on this list that I have saved off.  An
> optimized antenna for 10 GHz seems to make a lot of sense for 10 GHz-only
> events.
>
> One I'd like to outfit with with a WA5VJB PCB Vivaldi antenna as a
> multi-band feed for a rover dish on 3456, 5760, and 10 GHz.  Non-optimal,
> of course, but it seemed like it might work well for roving (aiming one
> dish and work the three bands.)
>
> So, I'm curious if that makes any sense.  Or would it be better to look for
> other dishes besides there.  I'd value your advice.
>
> Thanks and 73,
>
> David  W9HQ
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