[amsat-bb] Re: 1.2GHz and K5GNA BBQ Ant ??
w7lrd at comcast.net
Fri Nov 17 17:03:33 PST 2006
I'm pretty good at the helix antennas, but what would the minimum size be for 1.2Ghz. Currently I am putting together a four foot off center dish for both L & S. I was told some time ago that the 36x30 primestar dish would be too small for L band. My 12 turn helix is ok for AO51 but would be not so hot for the next heo with 10 watts. I'm planning for the next heo. I have this 12 foot paraclips C band that would be a bit over kill but fun to play with.
73 Bob W7LRD
-------------- Original message --------------
From: Anthony Monteiro <aa2tx at comcast.net>
> Hi Bill,,
> I did a pretty extensive analysis of this antenna including adding
> screening for receiving AO-40. The article withh all the details
> and measurements is in the proceedings of the 2004 AMSAT Space Symposium.
> This antenna was designed for max gain, not space communications, and it has
> a very high noise temperature. However, for receiving AO-51, the stock dish
> is fine. An initial analysis shows that it should be fine for receiving Eagle
> on S-band in most cases also.
> Tony AA2TX
> At 05:11 PM 11/17/2006, Bill Booth wrote:
> >Mark Brueggemann K5LXP recently inquired about a 1.2GHz antenna but
> >mentioned he had a K5GNA barbecue dish and converter. Since I have my
> >antennas down for rework, (since I moved) I am wondering the same thing.
> >I am also curious if covering the BBQ grill with screening material on the
> >K5GNA unit is worth the trouble. There was lots of discussion about it when
> >AO-40 was working, but I do not remember anyone saying it was worth the
> >trouble. Anybody add the screen material to the unit and what kind of
> >improvement did you hear......
> >Bill Booth VE3NXK
> >Sundridge ON, Canada
> >79.23.37 W x 45.46.18 N
> >Visit my weather WebCam at http://www.almaguin.com/wxcurrent/weather.html
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