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 --- On Mon, 10/25/10, The Smiths <notforc...@hotmail.com> wrote: What does APX have to do with TX or the readout? This is a Receive feature whereby it PEAKS a particular freq. in CW mode. The Shift number should read out JUST as it does now.. It would only effect the position of the APF location as you move it. This is my understanding. Wayne, Although that sounds like a cleaver idea, sometimes you want to keep the shift off freq. from your center pitch, but still peak someone in. This can help reduce noise that is in your pitch Band pass, but alow you to de-tune the noise around it... This presents a problem for your idea. It means that there would have to be a separate knob for the Shift and the APF location. Or at least this is how it should be. > Date: Mon, 25 Oct 2010 17:47:42 -0700 > From: n...@yahoo.com > To: n...@elecraft.com > CC: elecraft@mailman.qth.net > Subject: Re: [Elecraft] APF For K3: progress report > > OK. Next question; can I assume then that the TX and frequency readout follow? > > --- On Mon, 10/25/10, Wayne Burdick <n...@elecraft.com> wrote: > > > > It will in the K3 case. If you have > > SHIFT centered, the APF filter will be at your sidetone > > pitch. So in most cases you won't even need to do a SHIFT; > > just turn APF on using a full counterclockwise setting of > > the WIDTH control. SHIFT can be used if you want to tune in > > a station that is slightly off your sidetone pitch. > > > > Wayne > > > > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
