I've purchased a Maco M103 which makes a perfect test bed for this project since most people will already have or have access to these parts. A friend has a M106 I'm trying to pick up in order to build the 4 and 5 element version.

The second option is using a random 2" boom I have here and buying the BEB-2 brackets I listed above. The Maco elements, except for the driven element, will be shorted to the boom. Using the BEB-2 brackets will insulate all the elements from the boom.

I also picked up a M2 11M5DX and will be building this up also. This is an antenna to test against and also readily available for those who want an excellent commercial built antenna. It is a bit pricey though!

I've also picked up another old Cushcraft tri-band beam for parts. I'm a little busy this month but expect to be fully involved with this project in the beginning of October. This is a winter project!

I'll use old Mosley and KLM parts for the HD version.

__________________
The BEST money you will EVER spend on a radio system is on the ANTENNA and FEEDLINE!
http://www.cbjunk.com/

Using the BEB-2 brackets will insulate all the elements from the boom


isn't a yagis driven elements only insulated?
why would you want to feed the others?
and if you did you know you would need such amount of spacing
between them...

The outer elements are generically called parasitic elements. One is called the Reflector and the other one is called the director element

remember just asking a question. I been keeping up with this
testing it on my spitfire 427 3 element beam. so far I don't like the whole beam grounded and using a maco 5000 watt gamma match. the antenna was designed to keep the driven elements insulated from the ground. now just trying a direct feed with 9' 4" each driven element...any help will help me

__________________

Cobra-90LTD 8 swinging 35 Noclip
Cobra 148GTL
Cobra 148F(EXPORT)
Cobra 200GTL
Mod V-Plus
Homemade 8 pill running 18 volts
Brute force 350
Maco V5000
Spitfire 427 3 element beam

No, you can have them all shorted to the boom, all insulated from the boom, or a combination of both. It depends on the design of the antenna. You only feed the driven element(s).

If you short the elements to the boom, you need to make the element physically LONGER to compensate for the boom effect. Once lengthened, it will be the correct electrical length.

My new 11M5DX is DC grounded. There is nothing wrong with shorting to the boom, but you have to compensate for it. A DC grounded antenna will help dissipate any electrical build up on the elements and make the received signal quieter.

A direct feed, by my definition, means you don't need any sort of additional matching network. If you use a gamma, its NOT direct fed.

__________________
The BEST money you will EVER spend on a radio system is on the ANTENNA and FEEDLINE!
http://www.cbjunk.com/

A direct feed, by my definition, means you don't need any sort of additional matching network. If you use a gamma, its NOT direct fed.


right
Thanks for the info.
I will be keeping up with this

__________________

Cobra-90LTD 8 swinging 35 Noclip
Cobra 148GTL
Cobra 148F(EXPORT)
Cobra 200GTL
Mod V-Plus
Homemade 8 pill running 18 volts
Brute force 350
Maco V5000
Spitfire 427 3 element beam

Has anyone tried this for designing a 27mHz beam?

http://www.k7mem.150m.com/Electronic...vhf_quick.html


- I wonder how well this might work for HF?

__________________
_ If the World could know, if they could understand, that oh- the exquisite touch of the Creator's hand...brings a blur to my eyes, yet makes my vision clear __

Chief, are we going to do this,I would like to try this before the snow starts to drop.

I local here has offered me his Maco 105 as a test bed. He runs a converted Henry 3000D (3CX3000A7) and LMR600 coax. All of a sudden his SWR is whacked out so we are going to pull it down and rebuild it using a DIRECT FEED driven element. The 10K gamma is going in the trash! No beta, delta, gamma, or T-Match......a DIRECT FEED!

I don't know if we will beat your snow season, but the antenna is coming down next weekend.

At this point, don't spend a whole lot of money on replacing your gamma fed antenna! You probably already own 95% of what you need to build a BETTER antenna!

Sorry for the delay, but there will be more to follow!

__________________
The BEST money you will EVER spend on a radio system is on the ANTENNA and FEEDLINE!
http://www.cbjunk.com/

Hey Chief, what happen to this project.The snow left up here and the rain has pretty well quit. I am ready to start building.I was going to build another quad, but I wanted to try my hand at this. Later, ol smoker

I've got 3 different 4-element beam,stilling waiting to get started on this project or did you trash this project, Master Chief?

when are we building the beam?