Good point. We expect everything to be instantaneous. FWIW, the TT website
doesn't make any statement about frequency accuracy requiring a warm-up
period.
Mark
----- Original Message -----
From: <al_lorona@agilent.com>
To: <tentec@contesting.com>
Sent: Wednesday, June 18, 2003 13:27 PM
Subject: RE: [TenTec] Orion TCXO Warm Up Drift
>
> Now it's my turn to say, "Huh?" You mean the Ten Tec spec includes what
happens in the first hour after power on? That would be highly irregular.
>
> Nobody that I know who buys a piece of test equipment starts counting
oscillator frequencies and such until the unit under test is warmed up.
>
> Al W6LX
>
> > -----Original Message-----
> > From: Mark Erbaugh [mailto:mark@microenh.com]
> > Sent: Wednesday, 18 June 2003 9:35 AM
> > To: tentec@contesting.com
> > Subject: Re: [TenTec] Orion TCXO Warm Up Drift
> >
> >
> > I had a typo in my original post. I meant to say +/- 3 ppm
> > and I thought
> > that was being generous. 1 ppm sound more likely for a TOL
> > rig such as the
> > Orion. With +/- 1 ppm, the excursion should be less than 20
> > Hz (+/- 1 * 10)
> > at 10 MHz so the 35 Hz drift is way too high.
> >
> > 73,
> > Mark
> >
> > ----- Original Message -----
> > From: <nq5t@attbi.com>
> > To: <tentec@contesting.com>
> > Sent: Wednesday, June 18, 2003 11:35 AM
> > Subject: Re: [TenTec] Orion TCXO Warm Up Drift
> >
> >
> > > The spec is +/- 1 ppm at "room temperature" and +/- 3ppm "over
> > temperature",
> > > which I presume means over the defined operating range of 0-50 degC.
> > >
> > > As far as "excursion" is concerned, the range would be 2
> > ppm at "room
> > temp" and
> > > 6 ppm from 0-50 degC (if my interpretation of what "over
> > temperature"
> > means is
> > > correct).
> > >
> > > Grant/NQ5T
> > >
> > > > > It looks like your Orion may be out of spec. TT
> > published specs on
> > > > Orion's
> > > > > temperature stability is +/- 10 ppm, At 10 MHz, that is
> > 30 Hz. Your
> > Orion
> > > > > had an excursion of 989.0 - 953.7 or 35.3 Hz. One would
> > hope that the
> > +/-
> > > > 10
> > > > > ppm is 'worst case' but your measurements are even worse.
> > > > >
> > > > > 73,
> > > > > Mark
> > > > >
> > > > >
> > > > > _______________________________________________
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> > > >
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> > >
> >
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> >
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