Re: [IRCA] ALA 100 and related thoughts

["Chris Knight" <chris@xxxxxxxxxxxxxxx>]

I'm thinking the "compressed wire BOG" would give almost omni-directional
(perhaps not entirely), high angle reception (which isn't bad against
semi-locals and local stations) and good signal-pulling power.

However, Neil is correct. The way this "BOG" would work compared to a
standard BOG is quite a bit different. As a consequence the pattern would be
different. A good way to visualize the compressed wire antenna electrically
would be a coil-loaded, shortened vertical laying on its side.

73,

Chris

-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx
[mailto:irca-bounces@xxxxxxxxxxxxxxxx]On Behalf Of Neil Kazaross
Sent: Thursday, January 29, 2009 8:54 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] ALA 100 and related thoughts


Pardon me for raining on peoples' parades, but I do not think this idea will
work as it will, IMHO, assuming an easterly direction result in a pattern
that is the combo of many NNE mini-BOGs with many SSE mini-BOGs..and have a
wide beam.

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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