Screw-driver Antenna Problem
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| Oct 25th 2011, 01:33 | |
ka9lluTotal Topics: 0 Total Posts: 0 |
I have an older model factory-built(unknown mfgr) screwdriver antenna, that at one time would tune all H-F bands. I recently brought it out of storage, cleaned it, and replaced the finger-stock, and it now only tunes on 40M and up. No 75-80M at less than 3:1 SWR. This model is built with 2" copper tube and has a balun inside between the SO-239 conn. and the antenna tube. Any suggestions to get this to tune on 75-80M would be greatly appreciated. |
| Oct 29th 2011, 17:23 | |
K0BGTotal Topics: 0 Total Posts: 0 |
It might not be "factory"made, as I don't recall anyone using copper for the mast portion. The balun you commented on, probably isn't a balun, but an unun. Even that isn't needed really, as a small shunt coil is typically adequate. Properly adjusted, the antenna will cover 80-10 with a reasonable SWR (<1.5:1). Did you mean to say, it will tune 75, but the SWR is high?? Alan KØBG www.k0bg.com |
| Nov 13th 2011, 02:38 | |
ka9lluTotal Topics: 0 Total Posts: 0 |
To Alan, thanks for your input, but I did get the problem solved. And yes it would tune 75M, but the swr was 3:1 or higher. Thank-you, again. Bob KA9LLU |
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