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#1
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Buck wrote:
Today, if I don't get called into work, I plan to cut the wire next to the antenna mount and install an SO-239 so I can wire the tuner directly to the antenna or connect the coax to run to the front of the van where I have the radio mounted. SGC recommends that no transmission line be used between the tuner and the antenna because of arcing. Consider that to force just one watt into a CB whip on 4 MHz, EZNEC says it takes over 1700 volts. -- 73, Cecil http://www.qsl.net/w5dxp |
#2
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On Sun, 30 Apr 2006 13:26:10 GMT, Cecil Moore
wrote: Buck wrote: Today, if I don't get called into work, I plan to cut the wire next to the antenna mount and install an SO-239 so I can wire the tuner directly to the antenna or connect the coax to run to the front of the van where I have the radio mounted. SGC recommends that no transmission line be used between the tuner and the antenna because of arcing. Consider that to force just one watt into a CB whip on 4 MHz, EZNEC says it takes over 1700 volts. Interesting. Thanks. I am still testing. I tested with coax and the result is that the antennas designed for a given frequency work much better on their frequencies. I am looking for my soldering kit now for the connectors. I may try a direct connection to see what happens without coax if I can. back in a few. n4pgw -- 73 for now Buck N4PGW |
#3
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I'd have never guessed.
"Buck" wrote in message ... I tested with coax and the result is that the antennas designed for a given frequency work much better on their frequencies. |
#4
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I just finished testing my antennas. The result is that the
whip/tuner combination is unacceptable. I took the coax off the ball mount and ran short wires, about 6 inches from the center lead of the ball and from the ground screw at the ball inside the cab of the van and ran them to the appropriate connectors on the tuner. I then tested 75, 40, and 20 meters. The test results were that I made no contacts on 75. The only thing I heard was a very slow and long monolog on 3872 by some man who seemed more to be broadcasting than talking to another individual. I waited over ten minutes to see if he would break or identify, but he did neither. I went to 3.915 and heard two stations go QRT, but received no response when I called. I didn't have another antenna worth testing on 75 so that concluded my 75 meter test. Results: NO JOY! I went to 40 meters where I heard some conversations. It tuned up more easily than on 75, but no one answered my calls. I swapped to the 40 meter AS antenna and the stations I heard went from no signal on the scale to over s-9. That was enough to resolve that test. Results: NO JOY! I went to 20 meters where I had more success. I talked to Jim on the county hunter's net with the whip antenna. He was the only station I was hearing at the time. I swapped to the 20 meter AS antenna and his signal strength went from s-2 to s-9. Also, I was able to hear the mobile that was running. Results: NO JOY! I hooked the coax back up, setup the 20 meter AS antenna and tuned it from the front of the car. I will not be drilling a hole and rearranging all the roof antennas for the whip. I will rather focus my attention on getting the rest of the parts of my screwdriver together after I get paid next week and see if I can install it. Thanks for all the comments. If nothing else, all this testing did reveal a bad ground connection from the coax to the cab of the van. It is now fixed. 73 for now. -- 73 for now Buck N4PGW |
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