No worries. I figured this stuff out in a later post. The K3 is the boss, the P3 is the slave. Sorry about the bandwidth. I aint thinking correctly at work. Trying to do too much at once.
-lu- ----- Original Message Follows ----- From: "Joe Subich, W4TV" <[email protected]> To: [email protected], Lu Romero <[email protected]> Subject: Re: [Elecraft] P3: a modest proposal for QSY Date: Thu, 12 Aug 2010 15:23:09 -0400 > > What Joe W4TV is saying is that a P3 is "never more than >50 > > cycles" from the K3 frequency readout when correctly > > calibrated. With a 100 cycle bandwidth, this is >somewhat > > acceptable. > >You take what I said out of context. That statement was in >reference to the FREQUENCY DISPLAY. The FREQUENCY DISPLAY >is never move than 50 cycles from the K3 FREQUENCY DISPLAY. > That divergence is ONLY because the K3 FREQUENCY display >ROUNDS to the nearest 100 Hz (0.1 KHz). > > > However, on a Flex, I can click on a signal and be DEAD >ON > > the signal I have selected. > >If you have sufficient span (visual resolution) selecting a >signal on the P3 will put you dead on in the K3. However, >it is just like clicking on the spectrum or waterfall in >any digital program, the mouse has a one pixel resolution - >if you are trying to use a spectrum/waterfall span of 100 >KHz in a window that is 360 pixels wide (1/4 of an SXGA >screen), the BEST you can do is +/- 138 Hz (100 KHz/360). > >If you are using PowerSDR (the real FlexRadio) in full >screen mode on a 1600 pixel wide screen, each pixel will >represent about 70 Hz (100KHz/~1400 - the >spectrum/waterfall is not full width) and you can get >within +/-35 Hz. > >The same factors apply to the P3 ... your maximum accuracy >is SPAN/DISPLAY RESOLUTION. In the case of a 100 KHz span, >100KHz/480 +/- 100Hz ... that's one pixel and represents >the resolution limit of the display. However, I don't see >it as a real issue since a 100 KHz wide view only makes >sense on a relatively quiet band and you're not going to be >using a 50 Hz wide filter under those circumstances. > >73, > > ... Joe, W4TV > >On 8/12/2010 2:11 PM, Lu Romero wrote: >> So now I am getting a much better understanding... >> >> What Joe W4TV is saying is that a P3 is "never more than >> 50 cycles" from the K3 frequency readout when correctly >> calibrated. With a 100 cycle bandwidth, this is somewhat >> acceptable. >> >> However, on a Flex, I can click on a signal and be DEAD >> ON the signal I have selected. >> >> I have never operated a LP-Pan, but can I assume that it >> will function just like the Flex (it is the same software >> front end after all)? >> >> And Skimmer's waterfall display is also just as accurate. >> >> This means that if I am a "shoot fish in a barrel" mult >> operator and are combing the band for signals, I would be >> much more efficient time wise using a Flex/LP-Pan or a >> Skimmer than using a P3 on my K3, even with the Macro >> Magic CWT solution, right? The upside is that no >> computer is needed (which is a non trivial thing, IMO). >> >> Will/can the P3/K3 combination approach the accuracy of >> the above systems? >> >> -lu-w4lt- >> >> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
