[Elecraft] Optimising the PA stages
Hi All Ser Nr 5544 is now alive and kicking. When doing the Align/Test P III with the referenced power level setting of 10.0W I find the current level hovering around the upper limit of the recommended range at 2.0 amps although I did not see any Hi Current warnings. All the RX/TX alignment also seems OK. Is there any published tables on typical performance variance across the bands regarding signal level in for say S9 or MDS? or typical power levels out? This leads me to believe that some optimising can possibly be done, or I have some stages slightly off the intended specs. I was sure I seen some posts previously on alternate winding of the transformers in the TX chain from T1 onwards but I am getting way to may hits from the 11k messages I have archived from this list to be able to filter them down easily. Any information appreciated. John ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
RE: [Elecraft] Optimising the PA stages
There is an optimizing mod to one toroid for the K2 IF you are going to work at 5 watts or less, maximum. It'll reduce the xmit current a bit to help those using he QRP K2 with internal batteries. The flip side is that the rig is less efficient at higher levels. It's on the Elecraft web site (www.elecraft.com) under Builder's Resources. Ron AC7AC -Original Message- Hi All Ser Nr 5544 is now alive and kicking. When doing the Align/Test P III with the referenced power level setting of 10.0W I find the current level hovering around the upper limit of the recommended range at 2.0 amps although I did not see any Hi Current warnings. All the RX/TX alignment also seems OK. Is there any published tables on typical performance variance across the bands regarding signal level in for say S9 or MDS? or typical power levels out? This leads me to believe that some optimising can possibly be done, or I have some stages slightly off the intended specs. I was sure I seen some posts previously on alternate winding of the transformers in the TX chain from T1 onwards but I am getting way to may hits from the 11k messages I have archived from this list to be able to filter them down easily. Any information appreciated. John ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
RE: [Elecraft] Optimising the PA stages
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron D'Eau Claire Sent: Sunday, July 09, 2006 1:52 AM To: elecraft@mailman.qth.net Subject: RE: [Elecraft] Optimising the PA stages There is an optimizing mod to one toroid for the K2 IF you are going to work at 5 watts or less, maximum. It'll reduce the xmit current a bit to help those using he QRP K2 with internal batteries. The flip side is that the rig is less efficient at higher levels. It's on the Elecraft web site (www.elecraft.com) under Builder's Resources. Ron Thanks, I already found that one. It actually mentions it in the schematic in the manual but applies only to T4 turns ratio I think. At the moment its working quite well, its in my nature to be curious though ;-) I am going to have plenty fun with it either way. All best John Ron AC7AC -Original Message- Hi All Ser Nr 5544 is now alive and kicking. When doing the Align/Test P III with the referenced power level setting of 10.0W I find the current level hovering around the upper limit of the recommended range at 2.0 amps although I did not see any Hi Current warnings. All the RX/TX alignment also seems OK. Is there any published tables on typical performance variance across the bands regarding signal level in for say S9 or MDS? or typical power levels out? This leads me to believe that some optimising can possibly be done, or I have some stages slightly off the intended specs. I was sure I seen some posts previously on alternate winding of the transformers in the TX chain from T1 onwards but I am getting way to may hits from the 11k messages I have archived from this list to be able to filter them down easily. Any information appreciated. John ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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
