[Elecraft] P3 Not Zeroed

[Kevin, N4TT]

Hi Don:

I'm still checking things out but I think I have it all working together. I
calibrated the radio using WWV at 5, 10 and 15 MHz. I only had to line up
one and the other two fell right in. Then I went to the P3 and lined that
up with ref cal. Again, everything lined up at 5, 10 and 15.

Then I want back to fldigi which is where I originally noticed the
difference. I have the radio and fldigi set for a CW sidetone of 600 Hz.
When I would tune in the radio for the 600 Hz tone on a random CW signal,
the peak of the P3 trace was right over the signal and Fldigi showed the
signal up at  600 Hz. Everything matched. This is what I was looking for,
the three functions matching.

I think I'm in good shape.

Kev



On Thu, Jul 25, 2019 at 11:00 AM Don Wilhelm <donwilh at embarqmail.com> wrote:

> Kev,
>
> I believe that Alan's response, while correct is a bit confusing.
> In CW mode, a signal at 7.035,000 kHz should be shown at 7.035,000 MHz.
> OTOH, an SSB signal with a suppressed carrier frequency of 7.135,000 MHz
> will show the suppressed carrier frequency as the center, but the
> intelligence of the sidebands will appear above or below the center
> frequency (depends on USB or LSB).  Data modes will be similar to SSB.
>
> I am not certain why Alan prefers using a BCB signal, but WWV is an AM
> signal with defined frequency and tone frequencies.  IMHO, it is better
> than a broadcast signal for calibration and assessment purposes if used
> in SSB mode.  In CW mode, where the carrier frequency is important,
> Alan's choice may be good.
>
> 73,
> Don W3FPR
>
> On 7/23/2019 2:31 PM, Kevin, N4TT wrote:
> > Maybe that's the basic question...
> >
> > If I tune the radio to 7.035 to set a CW signal for a pitch of 600 Hz (as
> > set using the PITCH function) what should I expect to see on the P3?
> >
> > 1) The P3 shows 7.035 and the CW signal is offset from the center by 600
> Hz?
> >
> > 2) The P3 shows 7.035 and compensates for the pitch placing the CW signal
> > directly under the cursor?
> >
> > 3) The P3 shows 7.035600 placing the CW signal directly under the cursor?
> >
> > I expect #2.
> >
> > I'll be trying out more this evening.
> >
> > Kev
> >
> > On Tue, Jul 23, 2019 at 12:47 PM Alan Bloom <n1al at sonic.net> wrote:
> >
> >> Good advice.
> >>
> >>
> >> Also be aware that the center frequency differs depending on mode.  For
> >> example, it is the supressed carrier frequency on SSB but is offset by
> >> typically 600 Hz on CW.
> >>
> >>
> >> I like to use AM mode for frequeny calibration.  After doing a frequency
> >> calibration on the K3, tune to a signal on the AM broadcast band and
> adjust
> >> the P3 frequency calibration.  (MENU:RefCal.  Cal procedurre is on page
> 39
> >> of the manual)  As I recall, AM broadcast stations are required to be
> >> within 20 Hz of nominal frequency but are typically much closer than
> that.
>