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Don't worry about the connector - worry about the cable. If you add "regular" cable externally, it can increase the pulse width accordingly, but it will show a marked discontinuity and droop during its portion of the pulse, unless it is very low in loss. The best is to continue with the .141 semi-rigid type. Even the smaller .085 type will show a large difference, although it's pretty good stuff. If you use RG-58, you will be very disappointed.
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There is a limit to the pulse duration - the line charging circuit has to replenish the charge (figure about ten time constants) to nearly the full supply voltage between shots. With excessive line length, you will have to reduce the repetition rate in order to get to full voltage. It doesn't seem like it would be that big of a deal, but if you do the math considering the joules per pulse and repetition rate, you will find that it takes quite a bit of power to run. The output power is in the 50-100 W range during those nanoseconds of pulsing, and it's less than 50 percent efficient in delivery - not even counting the charging phase. If you hook a 10X or 100X 10 megohm scope probe to the charge line, you can observe the process from the line's point of view, and get a better feel for what's going on in there. The main thing for these pulsers is to get a fast front edge, then reach and hold a flat zone that's long enough to convey the amplitude information even for lower bandwidth scopes. Increasing the pulse width makes it easier to see and use, but eventually the rep-rate suffers - that is usually more important than pulse width. Ed --- In TekScopes@..., "iglesia_cristiana_arpas_eternas" <iglesia_cristiana_arpas_eternas@...> wrote:
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