building a 17m/12m beam out of scraps

[mr_fx]

I had an old Hi Gain TH-4 (2 elements 20m/15/10m, 1 element 10m, and 1 element 15m/20m) laying around... it was not worth fixing as it was just falling apart... I stole some parts off it to add 6m to my triband yagi (old Wilson SY-33) (built 3 6m 1/2 wave elements)

It has 4 traps for 10m and 6 traps for 15m

However the boom is in good shape and I was thinking about building a 17m/12m dual band 2 element yagi

I was thinking that MAYBE I could just use the 15m traps

looking kind of like this

17m 12m 12m 17m
------15m trap---------feed point---------15m trap------

Question would a 15m trap work or would this be a problem?

 

[Road Squawker]

you want to install 15 meter traps and then use them both above and below 15 meters.............. good luck with that

.do your self a favor,.... sell the 15 meter traps and put up a monobander

 

[Captain Kilowatt]

I realize you mean to have basically two mono band loaded antennas but what about each element functioning as a dual band element just like on the Cushcraft A3WS? Here is a page that details the conversion of the A3 tribander to an A3W dual bander for 12/17m.

http://www.qsl.net/w6efb/antenna.html

 

[mr_fx]

I realize you mean to have basically two mono band loaded antennas but what about each element functioning as a dual band element just like on the Cushcraft A3WS? Here is a page that details the conversion of the A3 tribander to an A3W dual bander for 12/17m.

http://www.qsl.net/w6efb/antenna.html

I think that is what I was looking for thanks


that was what I was trying to explain with this 'picture'

look at it like it's a dipole

------15m trap---------feed point---------15m trap------

 

[Captain Kilowatt]

OK when I saw 17m 12m 12m 17m I thought you meant two 15m elements and two 17m elements with the 15m elements in the middle of the 17m elements. I have not tried the modifications on the page I linked to above however the author of that page claims it works well. I was going to attempt it as I had a defunct A3 and a new Explorer-14 for 10/15/20/40m. I ended up buying a new A3WS instead when the dealer returned $800 in over payment for shipping me a tower. He got a deal from the freight company and passed it along to me.

 

[sp5it]

Look at this: http://www.qsl.net/dk7zb/2-Ele-Kurzwelle/2-Ele-12_17m.htm

Easy to build and tune.
Mike

 

[Captain Kilowatt]

Look at this: http://www.qsl.net/dk7zb/2-Ele-Kurzwelle/2-Ele-12_17m.htm

Easy to build and tune.
Mike

That is the configuration I was thinking the OP was talking about but with loaded elements rather than full sized. I thought it was on qsl.net but couldn.t find it for some reason.