Hi Crazy as it seems, running at a higher C Field current makes the device more sensitive to stray mag field. If you want to “soup up” your 5065, you would adjust the synthesizer for minimum (but still in range) C Field current.
Why not go to zero ( or real close to it) ? There are multiple quantum “resonance” modes. At zero C field they get very close to each other. Locking to the “right one” becomes tough. Bob > On Dec 5, 2020, at 3:09 PM, paul swed <[email protected]> wrote: > > Hello to the group. > Did switch the leads and no major effect. > I also did provide a separate power supply and am controlling the cfield > with that. It appears that by going to 7 ma the system is stable on the > original tube marking of 8714 on the thumbwheel. The original cfield range > went up to 6.6 ma. Literally adjusting the current resistor in the cfield > regulator will put it back into range. But thats still easily a 4ma jump to > get it back to normal. > Ed to your comment the pot could be expanded though with readings I am > getting may be just fine. It seems to be approx 5.0 E-12. Its a simple 1K > pot with digital dial readout that feeds a diff transistor and driver > transistor. Quite simple. > That said with the external supply sort of slapped in at 7.28 ma the unit > is 5.6 E-10. Clearly not stable but the supply is a tek unit etc. I at > least now know the range the cfield might want. > *But does it matter that I use a different thumbwheel setting if the > results are solid*? > Regards > Paul > WB8TSL > > On Sat, Dec 5, 2020 at 2:41 PM ed breya <[email protected]> wrote: > >> If the only problem is that you're at the resolution limit of the pot, >> you may be able to slightly modify the circuit, reducing the pot's >> effect, but also reducing the total adjustment range. I don't recall >> what the circuit looks like, but from the discussion I'm guessing it's >> like a 10 kilohm or so ten-turn WW with a kilodial on it, and it adds >> some adjustable current to the C-field network. The few k ohm range pots >> have set-ability that's near the small tick dial resolution. If the pot >> is quite low resistance, like less than 2 k, it can be much worse, due >> to the larger resistance wire - the wiper can only interpolate so much >> between the discrete wire turns, so the net value has more ripple with >> rotation. If the pot is in the few k region, you can gain quite a bit of >> actual resolution by upping it to say 50 or 100 k, but of course the >> rest of the circuit would have to be adapted. >> >> Ed >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
