David Gilbert wrote:
>
>
>I have to agree with Jim, N2EA. Add some top loading wires (more short
>ones is better than fewer long ones) to your existing 32 foot vertical,
>build an L-network tuner for the base, and make sure you have a very
>good radial system. You'll put out a better signal than the 6BTV, and
>equal or better than the BiggIR at far less cost. If you need a wide
>bandwidth for 75m SSB, make the L-network coil adjustable with a relay
>or two.
>
>For what it may be worth, I've found that EZNEC models top loading wires
>pretty well so you should be able to get pretty close the first try, and
>there are web sites and free software programs (such as TLW that comes
>with the ARRL Antenna Book) that will calculate the L-network for you.
>
>73,
>Dave AB7E
With one more capacitor, it probably wouldn't be difficult to make the
same network match on 40m as well, without switching. As a
starting-point, try doubling all the L and C values in this 40/20m
design:
http://www.arrl.org/qst/2005/09/richardson.pdf
--
73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|