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Re: [TCML] Odd VTTC Streamer Behavior

futuret@xxxxxxx wrote:

When I tried using a an 8kV rated mica transmitting cap
with a 6kVAC power supply, the transmitting cap failed.
So that may give some idea of what voltage ratios can
be withstood in a VTTC.  Of course each VTTC maybe
slightly different, etc.

For the other original issue... the problems over
105 to 120V:

Another possibility is that your staccato board may be
being affected by the RF.  That may be disrupting its
operation at the highest powers.  Better grounding
or bypassing of the staccato power supply may help
if that's the problem.  I had plenty of those problems
when I first was perfecting the staccato concept.


The 8 kV was probably a DC rating and you attempted to operate it way above ratings for the frequency you used. Transmit micas are normally rated for different currents at different frequencies; the product of the rated current at a particular frequency times the reactance of the capacitor at that frequency gives the maximum RF voltage, which is usually much less than the rated DC voltage. The reason for the current limit is heating due to the equivalent series resistance rather than voltage breakdown. Normally this information is on the name plate of the capacitor.

Other capacitors rated for RF service usually have similar ratings and these should be observed for maximum life.


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