Posted by
n7ws on
Oct 26, 2010; 2:14am
URL: http://elecraft.85.s1.nabble.com/APF-For-K3-tp5671688p5673158.html
Don,
Finally someone who understands how transceivers work!
I use XIT and RIT all of the time in lieu of the split function. But that's on purpose and I understand the ramifications.
Thanks,
Wes
--- On Mon, 10/25/10, Don Wilhelm <
[hidden email]> wrote:
From: Don Wilhelm <
[hidden email]>
Subject: Re: [Elecraft] APF For K3: progress report
To: "Wes Stewart" <
[hidden email]>
Cc: "Wayne Berdock" <
[hidden email]>, "The Smiths" <
[hidden email]>, "Elecraft Reflector" <
[hidden email]>
Date: Monday, October 25, 2010, 7:57 PM
Wes,
I agree with you - leave the pitch at the sidetone pitch and use the VFO to tune the desired station to that pitch is the best solution.
However some operators do it differently. There are many adherents of RIT and XIT. I understand their use for stations that are 'running', but for normal QSOs it is not required on a transceiver that can shift transmit frequency easily with the VFO knob. Zero-beat the station to be in QSO with and take up less bandspace. If everyone operated like that, there should be no need to change the pitch of the "peaking" point - it would be whatever the sidetone pitch is set to.
73,
Don W3FPR
On 10/25/2010 9:38 PM, Wes Stewart wrote:
> I understand completely what a BPF filter does, tunable or otherwise. You forget that this is a "transceiver", not a standalone receiver.
>
> If, as I believe Wayne indicated, the "Pitch" (NOT Shift) is going to follow the peak frequency of the filter (as it should IMHO) then the transmitter better follow along if you want to answer a guy on his RX frequency.
>
> If the transmitter is left behind, then if your nominal pitch is 500 Hz, then if you tune, for example, to a signal with a 700 Hz pitch, you're essentially operating split with a 200 Hz offset.
>
> The frequency readout indicates the zero beat frequency, as can be seen by switching modes from CW to SSB. The readout will be different between the two modes by the pitch frequency.
>
> If I'm off-base here and the APF can be tuned to other than the nominal pitch frequency (for reasons that totally escape me) then you will be operating "split". Bad form these days.
>
> Wes
>
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