Feed your Beam

[GunSlinger338]

Looking for different ways to feed a Maco Beam
Never liked the gama matches that come with these beams...
Anyone tried different techniques ?????
GOT PICS !!! ???

I have heard about direct feed. ??? cant find any info

 

[W5LZ]

Other than mechanically, there really isn't that much difference between any of the 'feeding' methods, they all have losses (not much, but some).
Direct feeding is certainly possible. The 'catch' being that the input impedance of the driven element of a beam will be less than 50 ohms. Using a balun at the feed point would be a good idea (make sure you 'turn' it in the right direction though ).
- 'Doc

 

[Marconi]

You might be able to find some combination of spacing and element lengths that will allow you to direct feed and then again, maybe not.

The Maco's use of tappered elements may prove to be a variable problem that is hard to solve with your idea. You will probably find that trying to affect reactance is unpredictably and sigificantly complicated by changes in the tubing size when adjusting for length. You may not be able to simply make adjustments to the ends of the elements and affect the match and resonance as you expect. If you have the time and patience though, then go for it. It would be interesting to hear about your results.

BTW, what do you find to be the problem with the gamma match idea and what device(s) will you be using to make your adjustments?

 

[GunSlinger338]

i wonder if you would also have to isolate at least the driven element in a direct feed SYS.

Just thinking out loud.

The Gamma Matches that come with these beams just seem cheap. IMO

"devices to make adjustments"..............
I guess that would be a good set of tubing cutters??