Stefan I am talking about matching the amp 8 ohms to 50 ohms not about resonating the antenna. My antenna is already resonated for 9 Kcs, or 137 as required. I was referring to your kite antenna and
Mal, I have a 2 uF C in series to the primary coil. I am using a homemade H bridge switching mode PA. The circuit is currently just in my mind but maybe i can draw and publish it soon. The impedance
Hi Mal, This results was not same district or near field, but 31 districts as shown multiplier factors. There are about 70 districts in Japan. He worked about a half of total Japan districs at 3.5MHz
Tnx Stefan for info. I now understand what u are doing. The audio amp is convenient for 9 kcs but I will build another class D for 9 kcs eventually My 137 amp is class D and 500 is class E all home b
Hi Rick, Am 17.08.2010 11:10, schrieb Rick Wakatori: This is an example of sending by the two earth electrodes antenna. I hope more experimeters will got a same trend. 7L1RLL Rick This weekend, i pla
Hi Tony and the others, Talking with JA5FP, Contest results using the two electrodes earth antenna were as follows: (1)JARL Field Day Contest: 3.5MHz, 86 QSOs, 31 multi. (2)KCJ Contest: 1.9MHz, 12 QS
Mal, Are you talking about a earth electrode antenna or your vertical antenna? I assume you mean the vertical ;-) You will get several kV, most probably above 10 kV rms on your antenna. That's why a
Mal, JA5FP said that the length of two electrodes earth antenna were 30m for 3.5MHz, 60m for 1.9MHz. These length were selected by 0.8 of photo speed for the earth. There may be an outer circle (both
Mal, I am using a galvanic decoupled primary winding at the bottom of the water barrel where the coil is wound on. Adjust the primary number of turns so that enough power is fed into the system. Watc
Stefan Are u using an audio amp, if so do u have a capacitor in series with the link winding otherwise the winding might appear as an almost short cct because of the low dc resistance. 73 de mal/g3ke
Rick On 3.5 Mcs the wires were probably a 1/4 wave each, on top of the ground and this is totally different to short wires being used on 137 Khz or 9Kcs where the wires are very short in relation to
This result is misleading because Japan is so densely populated with radio amateurs that these stations worked were probably in the Near Field. ie in the same district. When I was in Singapore 9V1OY
Stefan What method do u use to couple the amplifier to the electrodes? Is the amp output impedence 8 ohms. My method for my antenna using an audio amp would be to use a ferrite transformer to step up
