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#61
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improve S/N for AM car radio by a factor of 2...5...10?
wrote:
The rods are mounted horizontal, but are receiving a vertical signal off the ends. They don't receive worth a darn off the ends. The don't receive worth a darn in a vertical position. They are most effective when positioned horizontal and broadside to the transmitting antenna. One can take an AM radio, tune it to a fringe station and run the test for oneself. -- 73, Cecil http://www.w5dxp.com |
#62
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improve S/N for AM car radio by a factor of 2...5...10?
On Jan 25, 7:06*pm, Cecil Moore wrote:
wrote: The rods are mounted horizontal, but are receiving a vertical signal off the ends. They don't receive worth a darn off the ends. The don't receive worth a darn in a vertical position. They are most effective when positioned horizontal and broadside to the transmitting antenna. One can take an AM radio, tune it to a fringe station and run the test for oneself. -- 73, Cecil *http://www.w5dxp.com I looked into some of those. And it does change the pattern when you insert the rod into a coil. I hadn't realized that. I was thinking the directional properties stayed the same, with the rod only adding extra inductance to tune a lower frequency. I may have to try one of those to compare with the other loops I use. I saw a few places that sell large plastic coated rods for this purpose. |
#63
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improve S/N for AM car radio by a factor of 2...5...10?
Cecil wrote:
"Richard, what`s the MFJ part number?" Not sure as I don`t have a catalog but searched on "MFJ ferrite loop antenna" which yielded several responses including books, web sites, and a Radio Nederland 'build your own loop" instruction page, several of these mentioned MFJ 261 if my memory is correct. these responses assured me there was at least one MFJ ferrite loopstick offered before I posted. The right old radio would probably yield both variable capacitor and loopstick for a portable directional BCB antenna. Best regards, Richard Harrison, KB5WZI |
#64
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improve S/N for AM car radio by a factor of 2...5...10?
I searched again on MFJ BCB ferrite loop antenna. The number immediately
appeared and was 1026 so my memory must have been wrong. It was not 261. Best regards, Richard Harrison, KB5WZI |
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