Hello.... Can the typical thermo-couple amp meter be placed in the antenna lead-in. I have had several fail open after a few days use. They were not close to any metallic grounded objects, or subject
John, I am using a 1A thermo-couple meter and 1/2 ratio current transformer (to get a 4A range) since 2 years on 500kHz, without any problem. At 500kHz the values it shows are give or take 10%, so it
If the voltage on the output of the coil is higher than that on the input then (for constant power) the current must be less. Nick G4WHO Hi Nick, That would be through for DC, where P = U x I For AC
Hi all following this theme, I have thought of a further test to explore phase differences of current into the cold end of the loading coil and current making it out the hot end. With two RF ammeters
To All from PA0SE Steve, GW4ALG, responded: As mentioned in my earlier posting, I was careful to check for system resonance before each measurement. How about you, Dick? The effect Andy mentions is i
I also suggest that the different current measured at each end of a loading coil, as mentioned in an earlier posting, could quite easily be due to the slight mistuning when the extra hardware associ
Thanks Andy - I was trying to get my head around the reason for high voltage AND high current at the top of the coil. You have explained everything we ever need to know about antennas in a few paragr
input then Ah. This is one of the great mysteries of loading coils that has always baffled me. Does anyone have a good explanation? Mike, G3XDV (IO91VT) Are we in a Monty Python farce here ? Are you
To All from PA0SE When talking about the voltage on a certain point in a circuit it must be stated against which other point it is measured. When the loading coil is connected to earth at its bottom
If the voltage on the output of the coil is higher than that on the input then (for constant power) the current must be less. Nick G4WHO Ah. This is one of the great mysteries of loading coils that h
Dave states that even if it were a lumped inductance with zero length, the currents would be different. How can that possibly be so? Where does the current go? If the voltage on the output of the co
Hello all. Dave G3YMC has reiterated one of the common misconceptions about loaded antennas. There is no reason at all why the current out of the 'top' of the loading coil should not be exactly the s
Jim M0BMU said My loading coil lives outside in a shelter made of plastic sheet over a timber frame. To get rid of condensation, I have an old fan-heater in the bottom of the housing. The 2 heating e
