spacers for open wire feeders - HomeBrew Forum at eHam.net

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eHam.net Forum : HomeBrew : spacers for open wire feeders

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spacers for open wire feeders	Reply
by VK2XDZ on August 24, 2006	Mail this to a friend!
G'day, Thinking of making some open wire line out of 2 lengths of coax.Wondering if any of you have any ideas on something to use as spacers,or spreaders to keep the 2 lengths of coax evenly seperated. I know I could use perspex or plastic and cut them and drill them etc,but is there something out there that I could use that's cheap and more easily adaptable? Thanks and 73. Pete VK2XDZ

RE: spacers for open wire feeders	Reply
by K8AG on August 25, 2006	Mail this to a friend!
You might try plastic coat hangers. Although I am not using them for separators, I have used them for antenna mounts up in the sun for a few years and so far they are no where near failing. You can buy them cheaply by the bunch and cut your spacers to the desired length. I'm thinking about doing that for a jpole antenna. 73, JP, K8AG

RE: spacers for open wire feeders	Reply
by WW5AA on August 25, 2006	Mail this to a friend!
Pete, I use the plastic rods that control Venetian blinds, easy to find, cheap and easy to cut, but still requires drilling holes. 73, de Lindy

RE: spacers for open wire feeders	Reply
by HA5RXZ on August 26, 2006	Mail this to a friend!
Ice lolly sticks. Give a small bounty to each local kid for a bunch of ten sticks and you will soon have enough. They then need to be soaked in varnish to waterproof them. HA5RXZ

RE: spacers for open wire feeders	Reply
by AD5X on August 26, 2006	Mail this to a friend!
"Thinking of making some open wire line out of 2 lengths of coax." If you're making the feeders out of coax and the coax shields are grounded, then I'm pretty sure you don't need any separation. The two center conductors are driven in a balanced manner, but the coax shields completely isolate the center conductors from each other. So you can just tape or tie-wrap the two coax lines together. Phil - AD5X

RE: spacers for open wire feeders	Reply
by K3AN on August 26, 2006	Mail this to a friend!
I agree. But why do you want to do this? Why not a single run of coax and a balun at the far end? Keep in mind that if the SWR is high (as with a non-resonant or multi-band antenna like the G5RV), coax will have much higher loss than true open wire line.

RE: spacers for open wire feeders	Reply
by AI4NS on August 26, 2006	Mail this to a friend!
Another option is lawn sprinkler riser pipes. They are durable, and cut easily. Mike AI4NS

RE: spacers for open wire feeders	Reply
by K4DPK on October 21, 2009	Mail this to a friend!
Popsicle sticks. Boil them in parafin. Phil C. Sr. k4dpk

RE: spacers for open wire feeders	Reply
by WD4HXG on October 22, 2009	Mail this to a friend!
Venetian Blind slats. Cut to length needed. Punch holes with hand punch at spacing needed. Then either thread a stack onto extended lengths of wire or cut through the hole edge with a pair of scissors. If you use the scissors method and just cut open slightly the hole then the wire will snap through the opening. Use hot glue gun goop to hold the spacers in position on the wire. Sources for the slats include new ones at home improvement stores. If you ask the store assistant he may even give you what they trim off in stores for blinds sold and cut to custom sizes. Alternatively watch the trash heaps. It is not unusal to see damaged blinds in the roadside refuse left for collection. One set of blinds will provide a lot of spacers. Are you planning on using the coax shields as the conductors or the center conductors?

RE: spacers for open wire feeders	Reply
by KE3WD on October 23, 2009	Mail this to a friend!
"2 lengths of coax" -- does not need separators to run as a balanced line.

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