Probably you are suffering the bandwidth issue about standard power meter. Power meters used on shack are designed to measuring CW signals, single tone signals. DV use a fixed bandwidth with multiple carriers that can produce erroneous measures on standard watt-meters.
Edu YY4GMJ On Thu, Apr 4, 2013 at 6:40 AM, John Sweeney <[email protected]> wrote: > > > > > Since the subject is the Digital Voice with a K3. > > > > I have operated the DV voice with my K3 with the ALC showing the 5 to 7 > bars as recommended. However, even if I set the power out to 50 watts or > more, the maximum I can see on an external watt meter is at most 30 watts > indicated. I only see this limited power out indicated on the DV program, > other digital modes programs I show as high or low as I set the power out > for. > > > > Is this normal with the DV program, latest version? > > > > 73, John, N3WT > > > Lyle answered me offlist and told me to RTFM, page 18. It's right there > in black and white. > > > > 73 -- Lynn > > > > On 4/3/2013 3:37 PM, Don Wilhelm wrote: > >> Lynn, > >> > >> I have no verification, but the KX3 is "similar" (but not necessarily > >> the same). Note that the KX3 voice calls for 5 bars on the ALC meter > >> for voice, while the K3 calls for 5 to 7 bars. That says that there may > >> be some difference. > >> > >> We will have to wait for Lyle or Wayne to chime in with the real info on > >> the KX3 ALC onset point. > >> > >> In the meantime, I would suggest that the answer is "yes" set the KX3 > >> audio for 4 bars and assume that is the "no ALC" point. The 5th bar > >> would then indicate ALC is being activated. > >> > >> The power control in the KX3 is similar to the K3, so if the audio level > >> is too low, power creep will be the result. > >> > >> BTW, for those using the K2, the situation is similar, but the K2 ALC > >> meter does not have the "VU meter" scale at the low end. If the K2 ALC > >> indicator flickers, it means ALC has occurred. For the K2, increase the > >> audio until you see an ALC indication, and then back off until it is > >> gone. The power control on the K2, K3 and KX3 are essentially the same > >> - a closed loop system that attempts to produce the power output > >> requested on the power knob. Most transceivers do not do this closed > >> loop power control, but instead use an open loop system that depends on > >> the drive level alone. That is why the traditional advice to use the > >> audio drive level to control the power output works well with most > >> transceivers, but it does not work well with Elecraft transceivers > >> because they use a closed loop power control system. Only Elecraft and > >> some commercial transceivers use this closed loop power control system. > >> > >> 73, > >> Don W3FPR > >> > >> On 4/3/2013 5:53 PM, Lynn W. Taylor, WB6UUT wrote: > >>> Is it safe to assume this is true of the KX3 as well? > >>> > >>> -- Lynn > >>> > >>> On 4/3/2013 11:47 AM, Don Wilhelm wrote: > >>>> Well, I 'thought' was in the manual, and it *should* be. > >>>> > >>>> Lyle has explained several times here on the reflector (and he should > >>>> know, he designed it) that the onset of ALC action is at the 5th bar. > >>>> The bars below that do not indicate ALC action at all. > >>>> > >>>> Due to the way the K3 controls power, if you do not have sufficient > >>>> audio, the K3 will increase power (thinking there is not enough drive) > >>>> and you will find your power drifting upward as you transmit. > >>>> > >>>> So adjust for 4 bars on the ALC meter (that is *no* ALC) so your power > >>>> will be uniform throughout the transmission. With the K3 you must > have > >>>> sufficient audio drive to allow the power controls to work as they > >>>> should. > >>>> Contrary to the advice given for most transceivers (which do not > control > >>>> power in a closed loop), the K3 power will behave strangely if you use > >>>> that advice - which is to set the power for maximum and use the audio > >>>> drive to control the power output. That just will not work with the > K3. > >> > >> ______________________________________________________________ > >> 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 > > ______________________________________________________________ > > 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 > ______________________________________________________________ > 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 > ______________________________________________________________ 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
