Certainly, basic tuning can be done with simple coil taps, but once that is done a transformer can be useful despite losses. This is because it separates matching from tuning, which can interact when
Or even describe how you are testing for resonance. I am worried you are taking into consideration all the "what ifs" that have been raised, many of which are 2nd order effects and really you need to
J. Some pictures of the situation there would be of great assistance to all of us and may help in troubleshooting this great mystery! Beg, borrow or steal a digi camera! Scott
No, Dave, I was told long ago by Steve, to short the coax at the bottom end and feed both sides off the top of the variometer. When I did that my reception really improved. That has never changed sin
suggestions : Just ease away on the halyard so vertical sags away from the tower. ..to decouple further. Lower the top of the coax to the ground and check for dc continuity from braid at bottom to br
Wild guess .Coax vertical conductor has parted under its own weight.?? substitute a temporary random wire instead of the whole antenna and thus prove your test and monitoring system is working. Bryan
Dear JA, LF Group Using your variometer's winding data, and Claudio's calculator, the adjustment range comes out to 2.8 - 6.6mH. This seemed very large, but calculating the two coils as isolated sole
From G3PLX: JA: Using the figures you gave in your posting, and the IN3OTD variometer calculator quoted by Brian, I estimate that your variometer has inductance between 3.0 and 6.8mH. To do this, I c
Hi, I am not sure that that is the cause. If it were, you should be able to see signals on the scope match when you are not transmitting. Local RF can severely corrupt the operation of wideband detec
Dear Allan, I did not follow your antenna problem step by step, but possibly this may be the reason of mistuning: The vertical part of your antenna - the coaxial cable - is too close to your grounded
