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#1
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And how much do you wish to shorten it? I know not many amateurs have room
for a full size 13.6" dipole. wrote in message oups.com... Hi All, At 433 MHz UHF, I need to reduce the lenght of the dipole using loading coils or a better method. I need to know if there is a antenna program or a method to determine values and location. tnx de KJ4UO. |
#2
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I would like to make it half-size.
Can I just take the full-size dipole and roll the extra copper into a coil in the center? de KJ4UO |
#3
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If you wind the helical coils with large spacing between turns--pretty
close... The capacitance across the windings of the coils will be the most notable effect, and will induce a need to shorten the electrical length of the element conductors, keeping that capacitance to a minimum may allow this need to be insignificant. If not, just trim wire length a bit. Best might be to set up with a "wand" which can be lengthened or shortened a bit on each element which is so shortened by a coil. John wrote in message oups.com... I would like to make it half-size. Can I just take the full-size dipole and roll the extra copper into a coil in the center? de KJ4UO |
#4
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Will this be used for receive only or do you plan to transmit on it as well?
wrote in message oups.com... I would like to make it half-size. Can I just take the full-size dipole and roll the extra copper into a coil in the center? de KJ4UO |
#5
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I would like to make it half-size.
Can I just take the full-size dipole and roll the extra copper into a coil in the center? de KJ4UO ---------------------------------------------------------------- No you can't. Program ADDALOAD calculates the value of a loading coil to resonate an antenna wire of given length at any frequency. The location of the coil as a fraction of length along the antenna wire can be chosen in advance. That's if it's possible of course. In some cases a loading capacitor is needed. You will need a coil in each half of the dipole. Download in a few seconds program ADDALOAD from website below and run immediately. ---- .................................................. .......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. .......... |
#7
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with maximum shortening by loading coils, it is possible mattel can
fit such an antenna on a doll house! John "Fred W4JLE" wrote in message ... And how much do you wish to shorten it? I know not many amateurs have room for a full size 13.6" dipole. wrote in message oups.com... Hi All, At 433 MHz UHF, I need to reduce the lenght of the dipole using loading coils or a better method. I need to know if there is a antenna program or a method to determine values and location. tnx de KJ4UO. |
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