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Just some observations:
Vasik's Q6 is turning on faster than Itsu's. This is likely due to Itsu increasing R17 to 8.2K, Returning R17 to 3.3K will bring Itsu's turn on time more in line with Vasik's.
Vasik's Kacher is still ringing down with a significant amount of amplitude when Q6 is turned on. That is, collector coil ring-down oscillations remain large enough in amplitude at Q6 turn-on to impress oscillations into the base of Q6 ( presumably via capacitive coupling of the collector coil to the antenna).
It is possible that Itsu's Q6 is not applying enough current to the Q6 collector coil to sufficiently stimulate a longer ring-down. Another possibility is that Vasik's RLC of his Kacher is of higher Q than Itsu's and therefore ringing down for a longer period of time. Decreasing R17 further, i.e., 2K instead of 3.3K, will increase Q6/collector coil current and possibly provide sufficient stimulus to increase the ring-down time. If not, collector coil Q or collector coil to antenna coupling might need to be considered.
In both circuits (Vasik/Itsu), Q6 is only briefly turned on for just a few cycles at the Kacher frequency. It seems likely the rapid turn off of Q6 is providing the bulk of the stimulus initiating the Kacher ring-down.
PW
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Author
Topic: Dally, Shark & Ruslan workbench (Read 309961 times)
