[Elecraft] 4 Mhz oscillator

[Helmut Usbeck]

I'm quite sure my frequency counter calibration is OK, I had it checked
about a month ago.  Forgetting about ppm's and stuff it's + or - 1Hz at 10
Mhz.My headache with using WWV is the shack layout here, and to be realistic,
personally I've never been able to get a real dead-on null using WWv as a
freq. standard.  Last time I used a scope to keep track of the zero-beat
there was just to much qrn to get an accurate indication.  I'm going to
have to study up a bit on the best way to do this.
The only other thing I can think of is that my counter might be loading
down whatever circuit I have under test.  Can't say that I've had this
problem checking out oscillators and such on other equipment.

Well, back to the drawing board.

-Helm.  WB2ADT

On Sun, 29 Dec 2002, Mike McCoy wrote:

> Yes... After an hour warmup I initially used a HP freq counter to set the
> oscillator directly to *exactly* 4 Mhz (measuring right off left side of
> C22) and after PLL found the display to be off. I then used the recommended
> method of matching the display to the freq counter and it is still off. I'm
> 99.44% positive my freq counter is in calibration so I don't know what the
> problem is.
>
> As soon as I can hear WWV on 20Mhz I'm going to try the zero beat method.
>
> 73,
> Mike K5PU
>
> >
> > -Always noticed that my display reading of stations being received
> > seemed 50 Hz high.  I figured that the 4Mhz oscillator needed a tweak.
> > I originally aligned it by the frequency counter technique described in
> > the K2 manual, page 57.  Upon checking it I found it to be right on and
> > hadn't changed since I originally did it. So just for kicks I checked the
> > 4 Mhz oscillator and found it sitting at 3.85 Mhz. That seems to explain I
> > think my high display reading.  Problem I see is if I used a counter and
> > did it by the book, how come the low 4Mhz reading?  Anyone used a counter
> > and have this problem?
>
>
>