[Antennas] Multiband antennas

Sat Sep 25 00:09:21 EDT 2004

Mike:
Around this country that would be a very bad idea, not including actually doing it.
First most people have at least 2 panes of glass, second a large majority have the 
twin panes sealed with Argon between. I think that it has something to do with the 
climate as they are called storm windows.
Chris opr VE7HCB
I'm not sure if this has been mentioned before, but there is a good
way to pass 600 ohm line through a house without much of an impedance
hump.
First, a word of warning. CAUTION! If you follow this procedure, I
will not be responsible for any damage to your house or injury to you
or innocent bystanders.
This pass through assumes there is a window in the room. A children's
BB gun, held against the glass will "USUALLY" just plink a small hole
in the glass. A pair of side-by-side holes will accommodate a banana
plug arrangement. You put the posts through the holes, with rubber
washers, and snug them down. I then solder the 600 ohm ends to male
banana plugs.
This has another advantage. I put a drip loop outside the window. 
When the storms come, the wind whips the cable and the banana plugs
come out of the jacks, essentially disconnecting the antenna system
from the shack.
I have done this 4 times now with no broken windows.
YMMV
73, Mike kf4fdj
At 11:41 AM 9/18/2004 -0700, Chris BONDE wrote:
>Kevin:
>(your address direct does not seem to work for me)
>Let me know how you make out, please.
>>My 88ft antenna is an inverted "V" apex about 32ft, ends about 20ft
>final ends about 15ft. The ends had to be bent at about 30 degrees
>away from the main run of the antenna in plan view. The feeder line
>was made from extra wire with plastic conduit cut to maybe 4in with
>holes about 1/4 in in from end, heat gun glued. The final into the
>shack is 2 coax lines to tuner. Works well on 40 but not on 75, but
>I think that is the tuner.
>>Best of luck and have fun.
>>Chris opr VE7HCB
>>I am definitely going to the 88 foot antenna. The difference between
>mine and Cebik's is that mine isn't quite as high as he shows the one
>he works with and will be in an inverted vee configuration instead of
>a flat top. I have hopes my tuner will allow me to tune 80 and 40
>along with the three WARC bands. That is my goal. I can only try.
><GRIN>
>>Thanks much and very 73.
>>>Kevin :)
>Amateur Radio: K7RX
>Navy Marine Corps MARS: NNN0SHS
>>>>>-----Original Message-----
>From: Chris BONDE [mailto:ve7hcb at rac.ca]
>Sent: Friday, September 17, 2004 15:05
>To: antennas at mailman.qth.net; k7rx at comcast.net
>Subject: Re: [Antennas] More Questions on Multiband Antennas
>>I agree with Dave on the 88ft all band antenna. Go to Cebik's web
>page for many ideas. He has done a lot of work on the 88ft, why etc.
>However, I cannot make it work on all bands. Tuner, tuner. I had
>some expert help as well from this reflector to make it work. It
>does very well on 40m, 10m but not 75 etc.
>>Made my own 600 line as well.
>>But more than likely it is the configuration that causes the tuner
>not to be able to tune certain parts of the band.
>>Chris opr VE7HCB
>> Hi Again Kevin
>>Well the reason you got the loop recommendations is because to the
>way you worded your question. you wanted an antenna that was high
>angle on 80 and low on the upper bands and the horizontal loop fills
>that request very nicely. But to answer your question . 102 feet is
>not a magic number other than it represents about the shortest
>antenna that will operate very effectively on 80m. Not that other
>lengths are bad just that this one fit the bill for most people ,
>plus it was popularized by the late G5RV. His criteria were quite a
>bit different than most people believe however he was not originally
>trying to build an all band antenna and the 102ft length has some
>problems on bands above 20meter when fed the with a matching stub and
>coax. it is not a good 30 Meter antenna either though i've used them
>on that band there are much better antennas on that band. Some claim
>that 88 feet is a good compromise for an all band antenna- But you
>better have a good tuner with that one also.
>>It Really depends on what your trying to do.. and as many have found
>out over the years it is difficult to find one single antenna that
>will do what your asking for all bands. If you must stay with the
>inverted vee configuration you may want to try a trapped dipole.
>since it will do somewhat what you were asking in your original
>question. other than that or the loop you will find the antenna you
>are currently are using is not a bad choice.
>>73 Dave
>>-------Original Message-------
>>From: k7rx at comcast.net
>Date: 09/15/04 01:09:59
>To: antennas at mailman.qth.net
>Subject: [Antennas] More Questions on Multiband Antennas
>>Hello All,
>>When I asked my question concerning recommendations for multiband
>antennas which I might use to replace my current inverted vee which
>is 60 feet per side and fed with window line, the only
>recommendations I got back were for full wave loops. While this is
>ultimately my dream, I don't have the real estate presently to put up
>one of these. So, I am back to trapped or other types of antennas. To
>be honest, I'm not finding much in terms of dipole antennas trapped
>for the WARC bands as well.
>>In conducting research on the net, I keep seeing the figure of 102
>feet pop up again and again. This, of course, is the length of the
>classic G5RV and I have found at least two other references to
>multiband dipoles for 80 and up with a length of 102 feet. Is there
>something magical about this length? This may sound silly, but is
>there a magical suggested length for the non resonant dipole for 80
>and up? Is 102 feet this special length?
>>I would appreciate any thoughts any of you might share with me on
>this question. Thanks very much and very 73.
>>>Kevin :)
>Amateur Radio: K7RX
>Navy Marine Corps MARS: NNN0SHS
>>>>>- - -
>>Your moderator for this list is:
>Larry Wilson KE1HZ antennas-owner at mailman.qth.net
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