Re: Measuring resonant coil outputs
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1)? For those who didn't bother to look at the diagram, it shows specifically 35 kHz.? Enough said..... THE REST: I as well come from a physics background.? Be extremely careful with those power levels.? At 35 kHz and 1 kV feeding a spark gap, you are evidently using shock excitation to look for ring-down and harmonic generation from your resonant LC network.? As a precaution, I would strongly recommend installation of the following from MiniCircuits installed at the input of the TINYSA.? Leave it installed.? ? ?? VLM-33W-2W-S+? It is presently under redesign by MiniCircuits, but doing what you do, I'd almost "require" you install it or equivalent to protect the TINYSA - or any SA, for that matter. Considering your application, that should be installed in addition to attenuators? It would be best to have a selection to match the levels of harmonics and fundamentals excited by the shock exitation.? These are available from ebay, or, better quality, Pasternack.? Values might include the following:? 20 dB, 10 dB, 6 dB, and 3 dB.? Small SMA style packages at 1 watt or less are adequate for your application. ? Again, considering your power and voltage levels, I'd start with the short included antenna.? As such, it is an extremely short portion of a wavelength.? Therefore, you likely won't experience any frequency bias from the antenna up to where it becomes a 0.1-wavelength and more. ? Also start at some distance from your spark gap and the LC network.? Approach the operating system with caution to, again, be "kind" to the SA. ? You will also require multiple discharges of the spark gap to capture the ring-down and harmonic structure.? It would be advised to use the MAX HOLD function to capture the sum of a number of gap discharges.? Otherwise, the sweep is too slow (andy SA will exhibit this) to faithfully capture what you're after.?? I've done just what you are looking for before retirement for Uncle at KAFB in Albuquerque.? All I'll write based on the experience with Uncle is: "It's amazing what can be done with wide-band RF pulses".? I've also experimented as you here in my small lab.? If you want to email me offline of the group, please - I'm open.? Emails are: ? ?? DaveArea51A at gmail dot com ? ?? W zero LEV at arrl dot net Glad to help where I can. Dave - W?LEV? ? ?? On Fri, Apr 4, 2025 at 9:53?AM Kerrowman via <979jules979=[email protected]> wrote:
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Dave - W?LEV |