K2/100 and PSK31
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K2/100 and PSK31
 
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OK gurus...... I think I am doing this right.
I have advanced requested power just about full scale I have the transmit audio gain set to about 20w out idling. I have made sure that I am just below the point where the alc comes on I get really nice reports The fan comes on shortly after I start a QSO The heat sink gets really warm! Does that sound about right? I am just wondering if I should put some additional air on the heat sink with a larger muffin fan I just happen to have. 73, Jim W4ATK K2/100 #4028 _______________________________________________ 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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Jim,
PSK31 is continuous duty transmission, and the 20 watts idling is also 20 watts transmitting. The heat sink will get quite warm with longer transmissions, but should not be so hot you cannot keep you hand on it. Adding the muffin fan would be add extra comfort range even if it is not required. It can just lay on top the heatsink, moving air upward. If it is a DC fan, you can put a resistor in series with one power lead and slow it down considerably for less noise. 73, Don W3FPR ----- Original Message ----- From: "James T. "Jim" Rogers" <[hidden email]> To: "Elecraft Reflector" <[hidden email]> Sent: Thursday, November 18, 2004 7:39 AM Subject: [Elecraft] K2/100 and PSK31 > OK gurus...... I think I am doing this right. > > I have advanced requested power just about full scale > I have the transmit audio gain set to about 20w out idling. > I have made sure that I am just below the point where the alc comes on > I get really nice reports > The fan comes on shortly after I start a QSO > The heat sink gets really warm! > > Does that sound about right? I am just wondering if I should put some > additional air on the heat sink with a larger muffin fan I just happen to > have. > > 73, Jim W4ATK > K2/100 #4028 > > _______________________________________________ > 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 > _______________________________________________ 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 James T. "Jim" Rogers, W4ATK
Jim,
Will work ok, comments below, At 07:39 AM 11/18/2004, James T. \"Jim\" Rogers wrote: >OK gurus...... I think I am doing this right. > > I have advanced requested power just about full scale Ok, but if your peak is 40 watts, for example, I would set the power level control just above that point, say 45 watts, or whatever it works out to be. Set the power out to what you want. A series of !!!!! will get you the maximum power out that text will produce, or "tune" in MixW is supposed to do it with a tone. Be advised that a single tone produces CW. You need a two tone audio source to produce true peak power output. Of course most of don't have one, so try the !!!! and read the power on a true peak reading watt meter like the Autec WM1. Note: Most watt meters labeled "peak" are not. Whatever, but as you reduce the power knob at some point the ALC light will start to flicker. At that point, increase the power setting some until the flickering stops. > I have the transmit audio gain set to about 20w out idling. The average power is 20 watts, I assume. That may be too high, as average power is supposed to be 50% peak power, depending upon on what you read it on. You can go up to about a peak power of 30 watts, idle, which is an average power level of 15 watts, depending on what you use to read the power output level. The Autec will read 30 watts when the peak power is 30 watts. Unfortunately, many power meters read somewhere in between, so you don't know what your power is. Not that a receiving station will notice the difference. The bottom line is don't let your finals get too hot. > I have made sure that I am just below the point where the alc > comes on Ok > I get really nice reports > The fan comes on shortly after I start a QSO > The heat sink gets really warm! > >Does that sound about right? I am just wondering if I should put some >additional air on the heat sink with a larger muffin fan I just happen to >have. I use a 4" external muffin fan that I put rubber feet on and placed right above the heat sink. Helps. >73, Jim W4ATK >K2/100 #4028 _______________________________________________ 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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