[ARC5] Drift in BC-453 - more

[MICHAEL ST ANGELO]

Bill,

What is this millihertz spec for WSPR? I haven't tried it yet but I thought frequexcy stavility has to be a couple of hertz for the 2 minute cycle:

<https://groups.google.com/forum/#!topic/2-meter-wspr/-hDK071K1iM>

Mike N2MS


> On December 12, 2017 at 1:50 PM Bill Cromwell <wrcromwell at gmail.com> wrote:
> 
> 
> Hi Mike,
> 
> With millihertz specs for JT and WSPR the drift in the frequency counter 
> added to the drift in the BFO added to the drift in the HFO could fail 
> to show any problem at all. Or show problems that aren't there. I am one 
> of those archaic hams that still rely on WWV. From what I have read 
> fairly recently (past few years) WWV is useless too. I have shrugged my 
> shoulders and walked away from the millihertz modes.
> 
> Doing the best I can with only the Bureau of Standards to guide me.
> 
> 73,
> 
> Bill  KU8H
> 
> On 12/12/2017 09:57 AM, MICHAEL ST ANGELO wrote:
> > Folks,
> >
> >
> > Instead of guessingabout the drift  why don't you hook up a frequency
> > counter and measure the drift? If you don't have one there are lots of
> > $15 dollar counters on Ebay.
> >
> > Use light coupling, a small capacitor to lightly load the circuit. Thus
> > also blocks the DC from the counter.
> >
> > Mike N2MS
> >
> >
> >
> >> On December 11, 2017 at 5:23 PM "Kenneth G. Gordon" wrote:
> >>
> >>
> >> On 11 Dec 2017 at 20:50, J Mcvey wrote:
> >>> Are you really going to notice a 5 hertz/ minute drift?
> >>
> >> Hmmm....doubtful... Might....
> >>> A WSPR session is two minutes. The drift is significant to that
> >>> demodulation time.
> >>
> >> Yes.
> >>> It doesn't affect SSB or CW that much. I'm not exactly tone deaf, myself.
> >>
> >> I was thinking more of short-term drift...not drift over 2 minutes or
> >> more.
> >>> Rather than speculate, try it .
> >>> If yours works great, then I will know that I have an unusual
> >>> situation. Both my
> >>> R23 AND BC453 seem to have the same ailment.
> >>
> >> OK. Will do, and I'll report here.
> >>
> >> Ken W7EKB
> >>
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