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#3
February 12th 08, 02:10 AM
posted to rec.radio.amateur.homebrew
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R.F. Choke Design
"DaveM" wrote in message . .. "JimL" wrote in message . com... Greetings- can someone provide data on their home made choke for connecting across the output of a 1 KW, 3.5 mhz , transmitter working into 50 ohms. The so called safety choke to prevent the HV plate voltage from appearing on the antenna in case of failure of a blocking capacitor. Normally a commercial 2.5 MHY RFC is used. Perhaps something wound on a ferrite rod. Thanks, Jim. You might try calculating the inductance of a choke that presents about 500 to 1000 ohms of inductive reactance of the transmitter frequency. Use wire that can handle about 2 to 3 times the plate current of the final, or 2 to 3 times the HV fuse rating. The math is left as an exercise for the OP. -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) "In theory, there isn't any difference between theory and practice. In practice, there is." - Yogi Berra Thanks. That calculation is trivial. A more difficult calculation is determining what effect say, a 25 uhy choke, would have on the pi network to which it is connected. Evidentally 1 or 2.5 mhy has a negligible effect, since it never is considered in the literature I have seen. Perhaps the same is true for the 25 uhy., but I am too lazy to do the math.Quicker to just try same. Jim. |
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