Power output question
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I've noticed something with my K2/100 and wonder whether this is normal
behaviour or not ?? When I switch to a new band and send CW using full power, I don't seem to get full output power on the first couple of dits (or dahs), according to the bargraph power meter. After the first couple of dits the meter reads full scale, and continues to do so whilst I remain on that band. I also get the same thing when the turn the power back to 10 watts.. I only get the first 1 or 2 LEDS lit with the first couple of dits, but then full scale on the rest. Any ideas.. Cheers David, VK2NU _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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That's normal...
On a technical note: you have to stir the mojo for full effect. David VK2NA K2:S/N3222 On Sun, 25 Jul 2004 10:09:50 -0000, David Douglass <[hidden email]> wrote: > I've noticed something with my K2/100 and wonder whether this is normal > behaviour or not ?? > > When I switch to a new band and send CW using full power, I don't seem to > get full output power on the first couple of dits (or dahs), according to > the bargraph power meter. After the first couple of dits the meter reads > full scale, and continues to do so whilst I remain on that band. > > I also get the same thing when the turn the power back to 10 watts.. I > only > get the first 1 or 2 LEDS lit with the first couple of dits, but then > full > scale on the rest. > > Any ideas.. > > Cheers > > David, VK2NU > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > -- Using Opera's revolutionary e-mail client: http://www.opera.com/m2/ --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 0430-3, 23/07/2004 Tested on: 25/07/2004 8:14:41 PM avast! is copyright (c) 2000-2003 ALWIL Software. http://www.avast.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by David Douglass
Hi David:
>I've noticed something with my K2/100 and wonder whether this is normal >behaviour or not ?? > >When I switch to a new band and send CW using full power, I don't seem to >get full output power on the first couple of dits (or dahs), according to >the bargraph power meter. After the first couple of dits the meter reads >full scale, and continues to do so whilst I remain on that band. > >I also get the same thing when the turn the power back to 10 watts.. I >only get the first 1 or 2 LEDS lit with the first couple of dits, but then >full scale on the rest. This is normal operation. The K2 incorporates a digital (rather than analog) ALC circuit. As such, it must sample the output power level in order to be able to determine how much drive to apply. This takes several output cycles to accomplish and that's why you must apply a bit of RF in order for the ALC to find itself and do what it needs to adjust for proper output level. Cheers, Tom Hammond N0SS _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by David Douglass
That is normal behavior, David.
Your POWER control on the K2 is really a "requested power" control. It does not directly change the power level. When you transmit, the K2 senses the actual power output and compares the watts produced with what you have requested by setting the POWER control, then the logic adjusts the output to match the request - if it can. So after changing bands, power level setting, etc., the K2 must make RF before it can sense whether or not the actual power agrees with the requested power. That can often take a "couple of dits". Indeed, if you make the dits fast enough, it might take several before the logic has a chance to update everything. When you first power on, or make a variety of other changes, the logic automatically sets the power output to minimum until you transmit and it can see where you really want it set. Also, that's why you can set the power control for a reading higher than the K2 can produce. For example, a QRP K2 can be set to show 15 watts output on any band, but it can't really produce 15 watts on all bands. It's usually much closer to 10 watts on 10 meters, for example. Ron AC7AC -----Original Message----- I've noticed something with my K2/100 and wonder whether this is normal behaviour or not ?? When I switch to a new band and send CW using full power, I don't seem to get full output power on the first couple of dits (or dahs), according to the bargraph power meter. After the first couple of dits the meter reads full scale, and continues to do so whilst I remain on that band. I also get the same thing when the turn the power back to 10 watts.. I only get the first 1 or 2 LEDS lit with the first couple of dits, but then full scale on the rest. Any ideas.. Cheers David, VK2NU _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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