John Betner[KYHAM] Advice About HF

[Bill Fuqua]

          I would like to point out that a "dipole" which is simply two 
wires of equal fed at the center insulator is best.  If not resonant
  (half -wave usually) you may be able to match it with your antenna 
tuner.  The reason for a dipole is that it gets the RF out of the ham shack 
and is not relying on a RF ground to do so as long wire, 1/4 wave vertical 
antenna.  Often hams have some distance between their rig an ground and if 
it is over 10 or so feet RF in the shack can become a problem.
        A G5RVs and "half-wave dipoles" are equally dipoles and are 
balanced antennas. So is a random length piece of wire fed in the center. 
The problem you will have is that internal antenna tuners can only match 
antennas that are somewhat close to a match to start with. Usually limited 
to no more than about 3:1. This is because of the fact that there is 
limited space inside the transceiver for the tuner and that limits the 
choice components used.
         Antenna tuners that can match antennas with high SWRs require 
components that can with stand many times the normal voltages and currents 
of those observed with matched antennas.  That is why some antenna tuners 
are so large. They require variable capacitors with large plate spacing, 
coils made of large conductors and switches that will handle both large 
voltages and currents.



At 05:05 PM 5/31/2005 +0000, W8NSV wrote:

>John,
>
>As the message before mine,  I would have to agree... the best
>for the buck would infact be the long wire, My uncle Ben,
>has one that is cut for a specific band, and it was not difficult
>to install, or cut for a match.  "I" personally, would strongly
>suggest, ( Given you have space, ) to go with the wire diploe.
>The internal tuner will work well with it and you can cut it for
>any band of choosing, if you like or let the tuner make the match
>for you, they aren't expensive nor problematic to put together and install.
>
>One suggestion*** I might add, and I learned this from Uncle Ben...
>After you make connections to the PL259, coat the connector with
>vaseline, to ensure no moisture gets in.  It works great in the
>winter, and will hold up well in heat...providing the connectors
>aren't close to the roof surface. Beats tape or silicone!!!
>
>Hello,
>
>I have just recently aquired a Kenwood TS-2000 and I
>am learning the morse code ( slowly but surely ). I am
>trying to get suggestions on what would be a good HF
>antenna to use. Some people have told me a G5RV will
>work since I have an internal antenna tuner inside
>that radio. Then some people have told me to not get
>one because their junk and doesn't work for nothing.
>Also if a G5RV is recommended how does it need to
>hang. If you can kinda give me direction and advice
>right now all I'm doing is listening but I know as
>soon as I get the General Ticket I will want to be on
>there so I figured I'd go ahead and get it going.
>
>Thank You
>
>KG 4 LHQ
>
>
>RESPONDING TO W8NSV use these emails:
>col.don.r.maupin at netzero.com & w8nsv at yahoo.com
>
>INFORMATION?  http://groups.yahoo.com/group/k4co "VIEW ALL"
>
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