[Elecraft] P3 Not Zeroed

[Don Wilhelm]

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.