I've had my P3 for some weeks (I admit to being an ft so please don't everybody jump on me) and I agree with Joe. I STILL always turn the knob the wrong way when I go to adjust the ref level.
On 8/9/2010 7:57 AM, Joe Subich, W4TV wrote: > > Bill, > > > Alan N1AL may want to respond but I don't believe either is a bug. > > Both are consistent with more sensitivity in the clockwise direction, > > which is consistent in my opinion. > > While both controls, in fact, increase a behavioral parameter with > clockwise rotation, the behavior is still inconsistent with other > controls on both the K3 and P3. If the controls were arranged to > adjust an underlying behavioral parameter instead of an absolute > value, the WIDTH control on the K3 should be reversed so that it > increases SELECTIVITY (less width) with increasing clockwise > rotation. > > > We need to remember the P3 is not a spectrum analyzer (mainly used > > for measuring spurious signals down from a reference carrier but a > > panadapter (mainly used for identifying weak signals above a noise > > floor). > > I don't see how this makes any difference. The P3 controls are labeled > REF LVL and SCALE and not "MIN/MAX SENSITIVITY" and the values they > control have specific numeric values. Their behavior is backward based > on both the numeric values and the behavior of other controls in the > K3/P3 system. > > Although one could conceivably argue that REF LVL is ergonomically > correct in that counterclockwise rotation moves the reference level > (baseline) DOWN on screen, I find SCALE to be very confusing since > increasing rotation results in less visible range and a smaller (min > to max) size scale. After all the control is SCALE not amplitude > or trace size. > > 73, > > ... Joe, W4TV > > On 8/9/2010 10:01 AM, Bill W4ZV wrote: >> >> >> Joe Subich, W4TV-4 wrote: >>> >>> >>> Rotary controls in the K3 and P3 increase their parameter as the >>> encoder is turned clockwise except in two cases. >>> >>> 1) The P3 "REF LVL" is decreased with clockwise rotation. Maximum >>> reference level is -10 dBm with the encoder fully counterclockwise >>> while it is minimum -160 dBm with the encoder fully clockwise. >>> >>> 2) The P3 "SCALE" (range) is decreased with clockwise rotation. >>> Scale is minimum (10 dB) when the encoder is fully clockwise >>> and maximum (80 dB) when the encoder is fully counterclockwise. >>> >>> Both of these controls violate the principle of "expected" behavior >>> and consistent operation. >>> >> >> Alan N1AL may want to respond but I don't believe either is a bug. Both are >> consistent with more sensitivity in the clockwise direction, which is >> consistent in my opinion. In the case of REF LVL, turning clockwise until >> the noise floor becomes visible seems correct (i.e. like turning RF GAIN >> clockwise in a traditional radio). In the case of SCALE, it means less >> visible range above the noise floor which means more resolution of weak >> signals. >> >> After using the P3 I find the current conventions intuitive. While they >> might not be technically consistent (in terms of the values being set) I >> believe both are consistent and intuitive in terms of practical use. We >> need to remember the P3 is not a spectrum analyzer (mainly used for >> measuring spurious signals down from a reference carrier but a panadapter >> (mainly used for identifying weak signals above a noise floor). Either >> *can* be used the other way around, but I believe the controls of both are >> set up differently for good reasons. >> >> 73, Bill >> -- Vic ______________________________________________________________ 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
