[Elecraft] K2 Low Power on 12 and 10 Meters
In the past I have looked up various problem fixes in the Old Elecraft Digests, but can no longer find them? I would appreciate suggestion as to how I fix my K2 low power problem on 12 and 10 Meters. I think that there is a pot to adjust? Running the K2 without PA (ATU and Power Meter shows 1:1.1) into a dummy load. I find that all HF bands get a full 10-12 watts output, except 12 and 10 Meters, where I get 7 watts on 12M and less on 10M. This reduced output is reflected on the watt meter when I hook up my external KPA100/KAT100 and use more power. Help will be appreciated in solving the output problem and also where to find the Old Elecraft Digests. 73 - Larry- G0IKE (K2 -2424) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K2 Low Power on 12 and 10 Meters
Larry, Take a look at http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2_28.html#K2-tweak - second item - which talks about various tricks to do with the T2 and T1 transformers. Lifting T2 helped me. - Sverre, LA3ZA K2 #2198, K3 #3391, LA3ZA Blog: http://la3za.blogspot.com, LA3ZA Unofficial Guide to K2 modifications: http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-Low-Power-on-12-and-10-Meters-tp7580925p7580932.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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K2 Low Power on 12 and 10 Meters
Larry, Since you mentioned a pot to adjust, what is the chance that you increased the value of R98 (on the bottom of the RF board) above its normal value of 270 ohms. That resistor is sometimes increased to provide more rapid settling time for the power control loop (particularly in TUNE), and the procedure to find the correct value is to temporarily substitute a pot. If the resistor value is too high, the power on 10 (and often 12) meters will drop. Remove the bottom cover to check R98. There is no pot to adjust other than the temporary one mentioned above. 73, Don W3FPR On 11/17/2013 12:02 PM, Larry Dodson wrote: In the past I have looked up various problem fixes in the Old Elecraft Digests, but can no longer find them? I would appreciate suggestion as to how I fix my K2 low power problem on 12 and 10 Meters. I think that there is a pot to adjust? Running the K2 without PA (ATU and Power Meter shows 1:1.1) into a dummy load. I find that all HF bands get a full 10-12 watts output, except 12 and 10 Meters, where I get 7 watts on 12M and less on 10M. This reduced output is reflected on the watt meter when I hook up my external KPA100/KAT100 and use more power. Help will be appreciated in solving the output problem and also where to find the Old Elecraft Digests. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
