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VK5ZVS |
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| Projects 'n' Stuff |
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| RF Ammeter. |
| This rf ammeter will help in determining
whether the in-line current is at maximum going "up the stick" or in-line going to ground.
The meter was drawn with F5BU's Galva software, available as a free download from the internet.
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| Here is an inside view. The current transformer
was wound with twenty five turns over the centre conductor of an air celled inner conductor
of a piece of 75 ohm coax. Teflon tape is used to provide additional material for aligning
the core. The transformer provides the reference voltage for the detection & metering circuit.
Spot the simple fault - can you see why this circuit won't work and why?
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| The first capacitor is across the diode! This will allow the rf current
to bypass the diode !! Doh! The capacitor should be placed after the diode and to the return (blue) common lead.
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