[time-nuts] Datum 1000B's any hints ?
mspencer12345 at yahoo.ca
Tue Aug 28 02:53:27 UTC 2012
Thanks.. That seems like a good next step.
(Just to add to this, all three of the units have functional trim pots and two of three units will easily adjust to the correct frequency.)
> Message: 7
> Date: Mon, 27 Aug 2012 22:24:06 -0400 (EDT)
> From: EWKehren at aol.com
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Datum 1000B's any hints ?
> Message-ID: <1003d9.2a828d17.3d6d85c5 at aol.com>
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> without any EFC I would expect it to be 1 Hz low. If less
> than 5 Volt will
> get it on frequency I would use a 78L12 from your main
> supply followed by a
> TI REF02. Worked for me.
> Bert Kehren
> In a message dated 8/27/2012 10:13:35 P.M. Eastern Daylight
> mspencer12345 at yahoo.ca
> Wondering if anyone has any practical suggestions as to
> the operation of
> stand alone Datum 1000B's. Over the last 6
> months or so I've acquired 3
> of them and I haven't been that impressed with their
> performance. I've got
> a nicely running FTS 1050 and an 8600 series bva along
> with time lab and
> some HP5370's so I'm reasonably confident in my
> references and test setup.
> I've been powering them from stand alone linear power
> supplies with
> separate supply and return leads for the oven and
> electronics and have left them
> alone for several weeks at a time. I
> haven't touched the efc input yet
> and am wondering if leaving that floating could be
> causing issues. I also
> tried running one of them from my stand alone 24 volt
> battery system which
> didn't seem to help.
> They all seem to be gradually getting better over time
> but I'm thinking
> either I have three duds or there is something basic
> I'm missing (ie. perhaps
> I need to connect the efc input ?). I'm also
> wondering what if anything
> to connect the case ground to.
> The most promising of the bunch from an adev
> perspective is also off
> frequency by approx a hz or so but seems to be slowly
> drifting towards the
> correct value.
> Any comments would be appreciated.
> Regards Mark Spencer.
> Sent from my iPad
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