[CQ] antenna building?

[Mark Cohen]

I'm always up for building antennas. I've got a MFJ analyzer that covers HF and VHF/UHF which makes tuning a lot easier.

My schedule is somewhat busy at the moment, I might have part of Sunday afternoon free.. (at the soonest)

/Mark


On Nov 12, 2009, at 11:50 AM, Michael Shiloh wrote:

> Both yours and Mark's suggestion are excellent. I'm up for either.
> 
> The question is, is anyone else interested in building either of these? 
> We could buy the parts together and probably build them in an afternoon.
> 
> I'm interested in 2m and 70cm, both well suited to the two suggestions.
> 
> Jonathan Lassoff wrote:
>> Excerpts from Michael Shiloh's message of Thu Nov 12 10:39:30 -0800 2009:
>>> i need to make a very simple antenna for my dual band handheld (FT-60R), 
>>> so that i can use it inside my faraday cage (shipping container) at the 
>>> shipyard.
>>> 
>>> i envision a simple vertical perhaps with 4 radials. it will be mounted 
>>> on the roof of my container and so has a nice metal groundplane.
>>> 
>>> to simplify construction i don't  want to raise it very high. i hope 
>>> that a 2 * 4 stuck in one corner of the container will suffice. i will 
>>> somehow have to clear the (unused) solar panels on my roof.
>>> 
>>> my constraints are:
>>> 
>>> 1. price must be near zero
>>> 2. scrounged materials might be quite exotic but are entirely unpredictable
>>> 3. reasonably easy to construct
>> 
>> For which band were you thinking? I've had good luck in the past making
>> verticals with a chassis-mount SO-239 connectors.
>> 
>> The most common kind has a square plate to rest against the chassis and
>> four holes in the corner. I would solder four copper wires as a ground
>> plane and angle them down to match the right impedence.
>> 
>> In the center pin, I soldered another copper wire straight upwards.
>> 
>> The lengths of the wires can be adjusted for different frequencies.
>> 
>> Pretty cheap ('cept for the cost of the connector), and functional.
>> 
>> --j
>> 
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Mark Cohen
markc at binaryfaith.com

Science is a way of skeptically interrogating the universe with a fine understanding of human fallibility.
-Carl Sagan, 1996