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Web. 2.1. Antenna length based on the following formulars 12 dipole (feet) 468 frequency in Mhz. 12 dipole (meters) 142.65 frequency in Mhz. Full wave loop (feet) 1005 frequency in Mhz. Full wave loop (meters) 306.32 frequency in Mhz. Cut wire slightly longer for connecting insulators and pruning. 22-Jun-2007 0930 AM.

40 m - 10 meter band HWEF antenna for 7.000 MHz to 30.000 MHz 300 Watts Covers 7.000 Mhz to 30.00 Mhz Made 1.5 mm copper wire with black plastic jacket. 300 wattsNew style . 49.00 Ex Tax49.00 Add to Cart 40 m - 10 meter band HWEF antenna for 7.000 MHz to 30.000 MHz 500 Watts.

The simplest method of making an EFHW multi-band is to put links in it to allow the antenna to be adjusted in length easily. This is OK, but is likely to require lowering a squid pole to reach the links to change bands not ideal, but very simple. The other method is to segment the radiator wire with traps for the various desired bands ..

This online calculator tells you how the amout of inductance your loading coil will need to have. Total height of antenna in feet. Enter a length between 1 and 250 feet. Distance from antenna base to the center of the coil in feet. Enter "0" for a base loading coil.) Enter a distance between 0 and 250 feet that is less than half the total. Web.

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This will allow good matching of the half-wave radiating antenna wire to the 50 coaxial cable at virtually any location. It is not necessary to calculate the above; the results are sown in the following table. Lowest frequency 7.000 MHz. Highest frequency 14.350 MHz. Lowest measured inductivity 2.0 H.. I have made a javascript calculator below for simplicity with a 15m half wave ready to go Enter the frequency MHz Half Wave antenna is Metres Minimum counterpoise Metres End Fed Half Wave (6.65m 21.2MHz, ground mounted) SWR - Actual bandwidth on the 50 side of the coupler will be much narrower, due to the tuned circuit we are using.

QRPGuys Portable No Tune Half Wave Antenna 30. Your PayPal receipt is your confirmation that we have received your order. Stock availability and shipping volume can delay shipping. We continue our antenna offerings with this single band, 80m-10m end fed half wave wire antenna. It is designed as a highly portable wire antenna, easily set up ..

. Experience has shown that most external tuners and many internal tuners will tune 80-6 meters with an antenna length of 22&x27; to 39. If a longer antenna is desired, the provided antenna can be lengthened. Just remember where your choke goes on an EFHW (radio side) and this antenna will work great. 5 Stars PDF 16010 end fed ant 160-10.

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The basic formula for determining the length of a center fed, half-wave wire Dipole or Inverted Vee antenna is 468 freq (mHz) Length (feet). This formula takes into consideration the capacitive "end-effect" from insulators which shortens the physical length requirement for the equivalent electrical length..

Voltage and Current Distribution on a Half Wave Antenna To get EM radiation, we need to accelerate some electrons At end > Voltage max & current min At center > Voltage min & current max Feed impedance changes as the feed point moves Min Z at center (typically 50-75 ohms) Max Z at ends (typically 2-5K ohms) Off Center Fed Dipole (OCFD) (typically 200 ohms).

OK, now thats out of the way, lets continue. This calculator can be used to design a Slim Jim or a J Pole antenna. The Slim Jim, designed by the late Fred Judd, G2BCX, can be a great portable roll up antenna, if made out of 300 or 450 ladder line twin feeder. Add a loop of string to the top, and hang it on a tree branch, use it ..

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