Think it would work at 10 in JT65A mode? 48 seconds on and 72 seconds off, hour after hour? VY 73, Lance
On 3/3/2012 12:17 AM, wayne burdick [via Elecraft] wrote: > Jim Dunstan wrote: > > > The KX3 specifications indicate a nominal 10 watts output. When > > operating a mode such as PSK, which presents a continuous output, > > what is the recommended power output? > > We recommend using 5 W for data modes and keeping transmissions > reasonably short. However, you can definitely use full power (up to 12 > W) if the duty cycle is low, such as during hunt-and-pounce in a > contest. Of course as the duty cycle goes up, so will the PA and case > temperature, and eventually the KX3 may automatically roll back your > power output. > > I just did a test using the built-in PSK-D mode, alternately > transmitting and receiving for 20 seconds each (simulating short > contest contacts). At 12 watts (20 meters), the temperature never got > high enough to roll back power during ten minutes of this. > > I then tested the KX3's high-efficiency TX mode, which reduces current > drain by roughly 50% for a given power level. This mode kicks in at at > 5.0 W or less in CW/FSK-D modes, and at 3.0 W or less in all other > modes. So I set power to 3.0 W in PSK-D mode, which is amazingly > effective given the S/N ratio of PSK31, and transmitted continuously. > After 5 minutes the PA temperature was still increasing slowly, but > I'm guessing I could have gone on for another 5-10 minutes. > > The lesson, here, is to let the other station transmit once in awhile :) > > Wayne > N6KR > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] </user/SendEmail.jtp?type=node&node=7338488&i=0> > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > ------------------------------------------------------------------------------------- > If you reply to this email, your message will be added to the discussion > below: > http://elecraft.365791.n2.nabble.com/Kx3-power-output-tp7338175p7338488.html > To start a new topic under Elecraft, email > [email protected] > To unsubscribe from Elecraft, click here > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=365791&code=dzdnakBxLmNvbXwzNjU3OTF8OTMyNDMwOQ==>. > NAML > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > > -- Lance Collister, W7GJ (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ) P.O. Box 73 Frenchtown, MT 59834-0073 USA TEL: (406) 626-5728 QTH: DN27ub URL: http://www.bigskyspaces.com/w7gj Windows Messenger: [email protected] Skype: lanceW7GJ 2m DXCC #11/6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the Magic Band EME email group, or just fill in the request box at the bottom of my web page (above)! -- View this message in context: http://elecraft.365791.n2.nabble.com/Kx3-power-output-tp7338175p7338521.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
