Also the idea of using loops along the length of the BOG will not likely work since it will introduce vertical components that will mess up the BOG's directivity.
My opinion of why BOG's work well is because the velocity of propagation is slowed by ground, maybe to as much as 1/3 of an elevated classical Bev. Alsom, there's no vertical component of a BOG since the entire antenna is on the ground. I've done plenty of EZNEC modelling to show that with classic Bev's the long 1000 meter Bev we used in NF is quite forgiving of some ups and downs, but a shorter 200m Bev gets messed up easily.
73 KAZ ..just my experiences from real life and modelling----- Original Message ----- From: "Craig Healy" <bubba@xxxxxxxxxxxxxxxxxxxx> To: "Mailing list for the International Radio Club of America" <irca@xxxxxxxxxxxxxxxx>
Sent: Thursday, January 29, 2009 8:53 PM Subject: Re: [IRCA] ALA 100 and related thoughts
Chris/Nick: I have emailed Kevin S about using the crate loop, sans varicap, as a BOG "wire compressor" (for lack of better term). While my original example would not fit in a 50'x60' backyard, I guess that it could be scaled down. My original example used 50' feet of wire on the ground, fed into one end of the crate loop, then another 50' out of the backside of the crate, attached to another 50' section, hooked to another crate loop, then another 50' section, which would be terminated. You would wind up with a 400' "wire equivalent" BOG in the space of 150'. He stated that it might work and he said that he has a slinky longwire in his attic that works on the same principle. I have also saw a slinky EWE antenna that looks unique.I've considered trying a BOG in a shortened fashion. Run the wire in a zig-zag back and forth about 3' per "zig". Probably easier if some pegs were put in the ground to make a form. Kind of like: (coax end)/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\(termination) If we *ever* get rid of this miserable snow, I may try it. Craig Healy Providence, RI
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