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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...

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...

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...

how many turns required my friend?

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...

my match Pi system http://www.tzitzikas.webs.com/match.JPG is ok or i must modificate this to LC match system? it is ok or i must remove the 1500pf capacitor and increase the the first capacitor and add constant capacitors to 500pf capacitor? thank you.

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...

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...

i would like to ask which antenna is better for 160m? 1/4 wavelenght inverted L , 3/8 wavelenght inverted L or 1/2 wavelenght inverted L ?? thanks

i would like to ask you 2 questions: 1) the radials increase or decrease the inverted L efficiency when i don't use 50ohm antenna (coaxial cable 50ohm and 50ohm coupler). i know that when we use an 50ohm inverted L the radials increase the antenna's efficiency. 2) do you know about T antenna...

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...