hooked it up and got infinite SWR until I unwound the extra turns from the two posts. Was able to get a SWR of about 1.2:1 with the MFJ Versa Tuner 2. This was at 3.913 MHz. Will try to make a contact soon. Probably next week. From the following site I determined to feed the antenna directly with 50 ohm coax www.qsl.net "The feed point can be anywhere along the wire, but is normally made near one of the supports simply to lend stability to the antenna system. A loop is a loop, so anywhere you "break" it for the feed point, it's still a loop! The use of a balun is controversial. Some argue that the feed point impedance must be compensated for through the installation of a balun. Others argue that the installation of a balun will result in the radiation of undesirable harmonics and the loss of power. Tests that we ran way back when I was in college at the antenna laboratory at OSU resulted in the determination that directly feeding the loop with 50 ohm co-ax was most desireable. A quarter wave length of 75 ohm co-ax may be inserted in the feed line for a closer match if you desire." Directly feeding the loop antenna is obviously the simplest, however, you be your own judge and feel free to try it both ways. All 3 of my loops are directly fed with 50 ohm co-ax. My 17 and 10 meter loops are both vertically suspended and are relatively in the clear but low to the ground" www.eham.net "To Balun or Not To Balun feeding a full wave loop? « Reply #3 on: June 22, 2004, 05:58:20 PM ...
Wednesday, August 29, 2012
My Vertical Loop Antenna for 80 Meters
My Vertical Loop Antenna for 80 Meters Video Clips. Duration : 5.48 Mins.
hooked it up and got infinite SWR until I unwound the extra turns from the two posts. Was able to get a SWR of about 1.2:1 with the MFJ Versa Tuner 2. This was at 3.913 MHz. Will try to make a contact soon. Probably next week. From the following site I determined to feed the antenna directly with 50 ohm coax www.qsl.net "The feed point can be anywhere along the wire, but is normally made near one of the supports simply to lend stability to the antenna system. A loop is a loop, so anywhere you "break" it for the feed point, it's still a loop! The use of a balun is controversial. Some argue that the feed point impedance must be compensated for through the installation of a balun. Others argue that the installation of a balun will result in the radiation of undesirable harmonics and the loss of power. Tests that we ran way back when I was in college at the antenna laboratory at OSU resulted in the determination that directly feeding the loop with 50 ohm co-ax was most desireable. A quarter wave length of 75 ohm co-ax may be inserted in the feed line for a closer match if you desire." Directly feeding the loop antenna is obviously the simplest, however, you be your own judge and feel free to try it both ways. All 3 of my loops are directly fed with 50 ohm co-ax. My 17 and 10 meter loops are both vertically suspended and are relatively in the clear but low to the ground" www.eham.net "To Balun or Not To Balun feeding a full wave loop? « Reply #3 on: June 22, 2004, 05:58:20 PM ...
hooked it up and got infinite SWR until I unwound the extra turns from the two posts. Was able to get a SWR of about 1.2:1 with the MFJ Versa Tuner 2. This was at 3.913 MHz. Will try to make a contact soon. Probably next week. From the following site I determined to feed the antenna directly with 50 ohm coax www.qsl.net "The feed point can be anywhere along the wire, but is normally made near one of the supports simply to lend stability to the antenna system. A loop is a loop, so anywhere you "break" it for the feed point, it's still a loop! The use of a balun is controversial. Some argue that the feed point impedance must be compensated for through the installation of a balun. Others argue that the installation of a balun will result in the radiation of undesirable harmonics and the loss of power. Tests that we ran way back when I was in college at the antenna laboratory at OSU resulted in the determination that directly feeding the loop with 50 ohm co-ax was most desireable. A quarter wave length of 75 ohm co-ax may be inserted in the feed line for a closer match if you desire." Directly feeding the loop antenna is obviously the simplest, however, you be your own judge and feel free to try it both ways. All 3 of my loops are directly fed with 50 ohm co-ax. My 17 and 10 meter loops are both vertically suspended and are relatively in the clear but low to the ground" www.eham.net "To Balun or Not To Balun feeding a full wave loop? « Reply #3 on: June 22, 2004, 05:58:20 PM ...
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