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    construct Chebyshev 5-Element Low-Pass Filter

    hi. I would like to construct a Chebyshev 5-Element Low-Pass Filter (between linear and antenna) for 1431 khz. I would like to use standar capacitor values, which are easy to find. My problem is to find how many turns with 2mm diameter wire i need for the two coils of the filter. The filter is...
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    Problem with 500w AM Linear with mosfet IRFP360

    Hi. I have construct this linear 500w rms (2kw pep) (50ohm) with 12 mosfet irfp360, http://tzitzikas.webs.com/linear500w.jpg schematic. The manufacturer and other radio amateurs from a greek forum have construct it successfylly. The manufacturer tells that the linear requires only 2 watts...
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    antenna coupler help for medium waves?

    i have a transmitter 50 ohm output at 1431khz medium wave band. my antenna is an inverted-L antenna with (5/16)*wavelenght total lenght (20 meters vertical and 45 meters horizontal wire 2,5mm). i have 3 scematics for antenna coupler system. The first and the second schematic send me 2...
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    static high voltages of antenna protect

    i have an inverted L antenna for medium waves. i would like to ground the static high voltages. the antenna has static high voltages when the weather is not good. i am looking for a easy system to ground this voltages and to protect my transmitter and the tuning circuit. i had seen a...
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    medium waves match antenna-transmitter 50ohm system

    i have an 500w medium waves transmitter (output 50ohm) at 1431khz. i have the components and i have decide to construct this http://www.tzitzikas.webs.com/match.JPG match system. it is ok? i must connect the power/swr meter before this system (between transmitter and match system) or after this...
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    inverted L antenna for 1431KHz MW band

    hi. i have a transmitter about 150 watt (output an 813 tube 1400vdc) at 1431khz (salonika greece) and the antenna that i'm using is an inverted L antenna (with a less than 5l/16 length ,about 20m vertical segment and 40m horizontal segment). the coupler that i'm using now is l-type . at...
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    l/2 horizontal dipole vs inverted L 160m band

    i have a transmitter about 150 watt (output an 813 tube 1400vdc) at 1431khz (salonika greece) and the antenna that i'm using is an inverted L antenna (with a less than 5l/16 length ,about 20m vertical segment and 40m horizontal segment). the coupler that i'm using now is l-type . at...
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