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"Dave" wrote in message ... What you saw in the antenna book was not a misprint. It was an L network tuner. It is an impedance matcher, not a preselector. Gotcha. That was the only way I could figure it. I saw something almost similar (is that like almost pregnant?) in my Practical Antenna Hanbook (Joe Carr) last night, but suspect it is a printing error. It was an series inductor following behind a capacitor shunt to ground. Only that would (I think) choke off RF and shunt it to ground. (Am I wrong?) Have been trying to figure that one out all day. Last night I fixed my big solder gun, and can now solder a ground wire to the grounding rod outside my bedroom window. Hope to do that tomorrow. I am definetly going to set this up. Have already tested several of my small capacitors, but they do not appear stable enough for anything serious. Just to familiarize myself with the mathematics, I have already calculated the inductors I would need for the first one I tested. Just finished removing a better variable cap from an old junk shortwave radio (a Luke, I think) and am going to try to use it. May have a problem with my meter though. May have to take the variable cap to the shop and have it tested on a known good LCR meter (gotta get one of those. I a currently using a DMM with limited capacitance capability.) If I do that I'll take my calculator and notepad with me, so I can figure out and write down the values of inductance I need. Damn I'm having fun. Thank you very much for this suggestion. It is much appreciated. Dave |
#3
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Impedance matching on a random wire antenna may or may not do much good. It
is considerably more helpful with short wires. The most useful impedance match you are likely to get is that obtained with a 9:1 transformer at the base of your antenna before the coax. Take a look at my website (long overdue for an update). www.kc7nod.20m.com "Dave" wrote in message ... Oh. An impedance matcher. Never was much good with those... Does this match the impedance of the random wire to that of the radio input? That would be good too... Yes, an L network, that was what it was called I think. I marked it, to go back to it. Thanks, Dave "CW" wrote in message ... "Dave" wrote in message ... What you saw in the antenna book was not a misprint. It was an L network tuner. It is an impedance matcher, not a preselector. Gotcha. That was the only way I could figure it. I saw something almost similar (is that like almost pregnant?) in my Practical Antenna Hanbook (Joe Carr) last night, but suspect it is a printing error. It was an series inductor following behind a capacitor shunt to ground. Only that would (I think) choke off RF and shunt it to ground. (Am I wrong?) Have been trying to figure that one out all day. Last night I fixed my big solder gun, and can now solder a ground wire to the grounding rod outside my bedroom window. Hope to do that tomorrow. I am definetly going to set this up. Have already tested several of my small capacitors, but they do not appear stable enough for anything serious. Just to familiarize myself with the mathematics, I have already calculated the inductors I would need for the first one I tested. Just finished removing a better variable cap from an old junk shortwave radio (a Luke, I think) and am going to try to use it. May have a problem with my meter though. May have to take the variable cap to the shop and have it tested on a known good LCR meter (gotta get one of those. I a currently using a DMM with limited capacitance capability.) If I do that I'll take my calculator and notepad with me, so I can figure out and write down the values of inductance I need. Damn I'm having fun. Thank you very much for this suggestion. It is much appreciated. Dave |
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