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20m whip on 30m?
I'm in a tiny apartment for a while and plan to put a Hamstick-style whip on a mount clamped to a windowframe, to see if I can work a little PSK31. I wanted a HF whip for 30m but couldn't easily find one. I bought whips for 20 and 40. They're the usual things--5' fiberglass rod, 3/8-24 fittings at each end, loading wound onto the fiberglass rod, with a flexible whip at the end, adjustable in length, for tuning. I'm wondering about making an extension for the base--a length of aluminum or something, with 3/8-24 fittings at each end, and trying to get the 20meter whip's resonance down close to 30meters. Anybody tried this, have any advice/suggestion/information? TIA! --Ken AC4RD _______________________________________________ Ken Kuzenski AC4RD atsign mindspring dotsign com _______________________________________________ All disclaimers apply, see? www.duke.edu/~kuzen001 |
#2
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20m whip on 30m?
On Apr 17, 3:59 pm, wrote:
I'm in a tiny apartment for a while and plan to put a Hamstick-style whip on a mount clamped to a windowframe, to see if I can work a little PSK31. I wanted a HF whip for 30m but couldn't easily find one. I bought whips for 20 and 40. They're the usual things--5' fiberglass rod, 3/8-24 fittings at each end, loading wound onto the fiberglass rod, with a flexible whip at the end, adjustable in length, for tuning. I'm wondering about making an extension for the base--a length of aluminum or something, with 3/8-24 fittings at each end, and trying to get the 20meter whip's resonance down close to 30meters. Anybody tried this, have any advice/suggestion/information? TIA! --Ken AC4RD It would take much less length if you extended the stinger vs extending the base below the windings. It will take a lot of mast to tune it to 30m if you keep the same stinger length. I'm talking in feet, not inches. But you can extend the stinger just a few inches and tune it to 30m. You will need to find a longer stinger if that one won't extend out enough, and it probably won't unless there is plenty left after tuning it for 20m. For maximum efficiency, extend both ends. |
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