[amsat-bb] Eggbeaters--Extending Distance From Radials

[SCOTT MCDONALD]

Wes-  I’m inclined to agree with Jeff because I did that modification.

The easiest way to lower the ground plane is to remove the bolt that holds the radial plate to the antenna base and insert a piece of threaded rod of the correct length.  I just threaded a piece of solid aluminum rod on the ends and it worked well.  I can send you a pic if you want to see it.

Because I had 2 used EB432 I was able to do a head to head comparison and there is a noticeable improvement.  But it is not as good as a small CP beam.  If you have to run omnis I think the mod is worth it.

Good luck.

Scott ka9p

Make something good happen!

> On Nov 19, 2019, at 6:52 PM, Jeff Moore via AMSAT-BB <amsat-bb at amsat.org> wrote:
> 
> Look up Texas Potato Mashers - I think that is what you are looking for.
> They supposedly work a lot better than Egg Beaters but even then, they are
> likely a poor substitute for a small beam.
> 
> Jeff Moore  --  KE7ACY
> CN94
> 
>> On Tue, Nov 19, 2019 at 10:56 AM Wes Baden via AMSAT-BB <amsat-bb at amsat.org>
>> wrote:
>> 
>> New AMSAT member here, hoping to get on the air in the new future.  I'm
>> looking at the M2 Eggbeaters and I have a question that perhaps someone has
>> thought about already or better yet done some modeling for.  Specifically,
>> has anyone replaced the 6 inch standoff mast on the EB-144 with something
>> longer, and if so, how long, thus increasing the distance between the
>> element loops and radials?  (Also, would this even be possible on the
>> EB-432 as it looks like there is no standoff mast and instead the body
>> assembly attaches directly to the radial plate?)  My thinking, perhaps
>> faulty, is that extending the distance between the element loops and
>> radials on both models would have the desired effect of flattening out the
>> elevation pattern.  That is, there would be less gain overhead (where
>> satellites appear less frequently and high gain really isn't needed) but on
>> the other hand gain would be increased in the 15-45 degree range.  Has
>> anyone modified the Eggbeaters in this way?  Alternatively, has anyone
>> modeled Eggbeaters with longer standoff masts?  Is there an optimal
>> distance for standoff masts for both models, for using satellites that are
>> on the air at the present time?  Thanks!  Wes NA1ME.
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb