I use multiple, vertical slopers in a K8UR configuration. I used to
do the same thing with adding wires for CW, and got tired of it. I
added RF1J latching relays (surplus from Max Gain Systems). The
relays themsleves must add some inductance, as I only need about 5-6
ft of wire to move the resonance from 3800 to 3525 (and only on the
lower end). To switch the relays I built a 24VDC controller that
sends a short pulse (using an NE555 and pass transistor) to them.
Barry, W2UP
On 4 Nov 2005 at 8:28, Cqtestk4xs@aol.com wrote:
> For the last few years I have been using four sets of rope supported
> quads..a two element facing JA, a two element facing VK, a two element
> facing SA, and a four element facing EU. All are tuned for the SSB
> part of the band.
>
> To operate CW contests, I lower the ends of the ropes supporting them
> screw in the extra pieces of wire, and raise them again. It's a
> pretty simple method but it doesn't solve the day to day excursions
> into the CW band.
>
> The loops are actually flattop delta loops so the pointed end faces
> toward the ground. The ends either have coax at the bottom or a rope
> at the bottom to keep it from blowing around. So what I would like to
> do is to put a relay and a coil at the bottom of each element to make
> the element resonant around 3725. They are currently resonant around
> 3775.
>
> Any idea of what kind of inductance would be required to make this
> happen? I know I would need to choke the relay wires. Would the old
> "coil it up" method work on the relay wires? Any special caveats on
> using this system?
>
> The system kicks butt on 80, but I would like the ability to switch
> back and forth between SSB and CW. Just using a tuner doesn't work,
> since the reflector isn't a very good reflector when you go down
> 250kHz. Any ideas?
>
> Bill K4XS
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless Weather Stations", and lot's more. Call Toll Free,
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
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>
--
Barry Kutner, W2UP Internet: w2up@mindspring.com
Newtown, PA Frankford Radio Club
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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