kb8tq@n1k.org said: [context is EFC control voltage] > Generally, the biggest factor is the voltage drop from the oven current > getting into the EFC “loop”. Its actually pretty hard to keep them separate. Is there a fundamental problem, or is it just that everybody uses historical footprints that don't have separate ground pins? -- These are my opinions. I hate spam.

Am 21.03.2018 um 23:03 schrieb Hal Murray: > kb8tq@n1k.org said: > [context is EFC control voltage] >> Generally, the biggest factor is the voltage drop from the oven current >> getting into the EFC “loop”. Its actually pretty hard to keep them separate. > Is there a fundamental problem, or is it just that everybody uses historical > footprints that don't have separate ground pins? The HP 10811 has separate pins for oscillator and oven, for power and gnd, and 2 of them for each of the four. regards, Gerhard

Hi The gotcha is not on the manufacturing end. When you show up with a dual ground pin part, the OEM asks: Where do I tell the PCB layout guys to put the other ground? The answer always comes back to “there’s only one ground plane, they will both connect to the same plane.”. If you get past that, the somewhat surprising next layer is that temperature performance maybe isn’t that big a deal to them …. Bob > On Mar 21, 2018, at 6:03 PM, Hal Murray <hmurray@megapathdsl.net> wrote: > > > kb8tq@n1k.org said: > [context is EFC control voltage] >> Generally, the biggest factor is the voltage drop from the oven current >> getting into the EFC “loop”. Its actually pretty hard to keep them separate. > > Is there a fundamental problem, or is it just that everybody uses historical > footprints that don't have separate ground pins? > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.