[digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread Andrew O'Brien
I am tempted to try get active on 6M-70cm for digital modes and CW this summer. I am looking to avoid multiple runs of coax and thought of a homebrewed log periodic for these bands, using one feedline . Does anyone here use one, or have favorite software for log periodic design? Is the

Re: [digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread kh6ty
Hi Andy, I operate 2 meters and 70 cm every day from here in Mount Pleasant. You really need 14 dBi of antenna gain on 2 meters and 17 dBi on 70 cm to reach 200 miles on phone if there is no propagation enhancement. A log-periodic will probably not have enough gain on any one of the bands it

Re: [digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread kh6ty
Andy, Another excellent high gain antenna for either 2 meters or 70 cm that can be homebrewed is the quagi: http://commfaculty.fullerton.edu/woverbeck/quagi.htm You will be happiest with at least this much gain on either band. 73, Skip KH6TY Andrew O'Brien wrote: I am tempted to try get

Re: [digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread Andy obrien
Thanks Skip, I had a K1FO design 2M beam but took it apart , too big for me. I also have old large 2M and 440 cross polarized Yagis laying in the garage doing nothing , but again too much antenna for my back yard these days. Your SS5 skeleton-slot beam is a clever design. What is the actual

Re: [digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread kh6ty
The SS5 is a true skeleton-slot beam with five skeleton-clot elements. Each one is a skeleton-slot. The overall dimentions are 13 x 2 plus the width: Reflector width: 7 5/8 Driven element width: 6 1/4 D1 width: 6 1/4 D2 width: 6 1/8 D3 width: 5 7/8 I standardized on the height of each