yes FC means Frequency Center the astric * before the number indicates the APF shift is in the center the .68 sez your center (your cw pitch) set to 680hz
so if you saw .670 or .690 there would be no * and your APF center would now be 10 hz up .690 or down .670 some have found the ringing they experienced with APF was fixed by shifting the APF center off by maybe 10-20hz and using the RIT moved their receive the same amount On 1/31/2014 12:48 PM, Phil Hystad wrote:
I have had my K3 for four years but rarely make use of the passband tuning features. Today though I was experimenting with APF and the passband controls and learned that I really do not know what I am doing. In particular, the VFO B display is a mystery to me during passband tuning and APF SHIFT tuning. For example, in passband tuning (APF not enabled), the VFO B display says FC and then a number like 0.70 or whatever. What does "FC" mean (I can guess, but that would not be useful) and what is this number. I scanned all the documents I have and have not found descriptions of the content of the VFO B readout during passband tuning. I know it has something to do with shifting the frequency of center (I think) so maybe FC means Frequency Center. Also, there is an asterisk in the field, like: FC *0.68. Maybe someone can interpret the meaning of that. If I knew the definition for passband tuning for the VFO B field content I could probably guess at the meaning of the APF enabled display which is similar such as: APF *0.68. I have found lots of description of passband tuning and that part of the display showing the passband width and position but nothing describing the VFO B contents (not covered in documentation on alternate VFO B displays either). 73, phil, K7PEH
-- GB & 73 K5OAI Sam Morgan ______________________________________________________________ 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
