RE: [Elecraft] KX1 #01221 Alive but shy of stated power?
Bill WHAT are the changes to R11 and R30 Everyone is referring to them, but no-one has said what they are!! Must be a dark secret, Grif. Nobody seems to want to tell, apparently least of all the folks who report having performed the mods! A small difference in power isn't worth consideration vs the importance of a clean signal. A change from 4 w to 2 w is only 3 db which is not notable for audio difference. Thus some of us who have owned for the entire time haven't paid any long lasting attention. I have never operated any QRP rig at it's full power. The reduced power has a huge advantage in battery life and has little to no impact on the receiving station's ability to copy. Bill K9YEQ ___ 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] KX1 #01221 Alive but shy of stated power?
Bill Johnson wrote: Bill WHAT are the changes to R11 and R30 Everyone is referring to them, but no-one has said what they are!! Must be a dark secret, Grif. Nobody seems to want to tell, apparently least of all the folks who report having performed the mods! A small difference in power isn't worth consideration vs the importance of a clean signal. A change from 4 w to 2 w is only 3 db which is not notable for audio difference. Thus some of us who have owned for the entire time haven't paid any long lasting attention. I have never operated any QRP rig at it's full power. The reduced power has a huge advantage in battery life and has little to no impact on the receiving station's ability to copy. Bill K9YEQ ___ 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 I do not have a KX1 anymore. It is a long story. I was able to dig through my old sent email messages. I purchased and built an early serial number KX1. I hope this help you. Glenn Maclean WA7SPY Sacramento, CA Here is what Gary at Elecraft had to say. I went by his guide lines. 33 ohms worked well in my case. Your milage may very. Yes it is OK to change R30 do not go any more than 47 ohms. (See below) Hi All; Here is the comments from Gary at Elecraft concerning the Low Power conidition of the KX-1. Those output levels are typical and are pretty normal. You will only get 3-4w if 13.8 to 14.0VDC is used, and the load is a good 50 ohm non-reactive match. The KX1 is not designed to produce 4-5w (or more) like the K1 can, as it has a much simpler transmitter and is optimized for mainly portable and battery use. If all parts are correct, you can safely increase R30 at the base of the PA transistor Q6, but not more than 33-47 ohms or increased spurious output will result. 33 ohms would be a good first value to try. -- 73, Gary AB7MY ___ 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] KX1 #01221 Alive but shy of stated power?
WHAT are the changes to R11 and R30 Everyone is referring to them, but no-one has said what they are!! Grif, KF4JG - Original Message - From: Coote, Jay [EMAIL PROTECTED] To: Jeremy Cowgar [EMAIL PROTECTED]; elecraft@mailman.qth.net Sent: Thursday, August 04, 2005 10:04 AM Subject: RE: [Elecraft] KX1 #01221 Alive but shy of stated power? Jeremy and List; Your KX-1 turned out better than mine. My 10 MHz band is weak and noisy on receive plus I had the following transmitter problems: I had 4 watts/7MHz and 10 MHz, 2.6 watts/14 MHz at 13.8V; 1.4 watts/7MHz and 0.8 watts/14 MHz at 9.0V. I've tried the changes in R11 and R30 to increase power output, however this just increases power and does nothing for my 14 MHz power roll-off. Mine obviously does not meet spec and it is good to have suggestions on what to try next from Elecraft. I've heard of people getting 4 watts or more, nearly flat across all three bands. That power rise on 14 MHz at 9V does sound odd... I would have guessed it to be around 1 watt. Is your power supply at 9V delivering enough current or is there a voltage drop- possibly preventing a relay from opening/closing and changing the specs of the RF filters on the PA?... A guess. Jay W6CJ ___ 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] KX1 #01221 Alive but shy of stated power?
WHAT are the changes to R11 and R30 Everyone is referring to them, but no-one has said what they are!! I was reading past posts about the KX1 and stumbled across this post: http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-11/msg01045.html *To*: Elecraft@mailman.qth.net mailto:Elecraft%40mailman.qth.net *Subject*: Re: [Elecraft] KX1 Power Measurements by band *From*: [EMAIL PROTECTED] mailto:DYARNES%40aol.com *Date*: Sat, 29 Nov 2003 09:12:05 EST Add me to the list of those experiencing low power output. I was getting under 2 watts on 40, and just over 2 watts on 30 and 20. Gary suggested I increase R30 to 27 ohms and decrease R11 to between 3.3 ohms and 5.6 ohms (after first suggesting I check the toroids, etc.). I made the above changes and my power out went to about 2.5 on 40, and just over 3 watts on 30 and 20. I had been behind in monitoring the reflector, and now I see the other comments about low power. I had gathered from my exchanges with Gary that I wasn't the only one with this problem. So, I guess I will dig back in and up the value for R30 a bit more. Thanks to the NorCal resistor kit, I have a nice supply. Then, hopefully, squeezing the turns on L2 will be necessary (it wasn't before obviously). My guess is, though, that I still won't get to the power levels that Ron and Phil are reporting. We'll see. I am also noticing the lack of audio output that others mentioned, although on 40 it seems pretty good. It's just on 30 and 20 that it seems a little light. But the RX doesn't seem to miss much sensitivity wise. Pretty darn good RX design I'd say. Everything else seems to be working like a charm! Dave W7AQK ___ 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] KX1 #01221 Alive but shy of stated power?
WHAT are the changes to R11 and R30 Everyone is referring to them, but no-one has said what they are!! I was reading past posts about the KX1 and stumbled across this post: http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-11/msg01045.html I also read quite a bit about compressing L2 to 70% or so instead of 90% for low power problems. Have not tried either, but compressing L2 seems like a much easier task than swapping the resistors. I will try that tonight and let people know how I fare. Jeremy KB8LFA ___ 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] KX1 #01221 Alive but shy of stated power?
Grif wrote: WHAT are the changes to R11 and R30 Everyone is referring to them, but no-one has said what they are!! Must be a dark secret, Grif. Nobody seems to want to tell, apparently least of all the folks who report having performed the mods! I'd help if I knew...but I don't have a KX1. I looked at KX1-related info on the elecraft web site (Tech Notes and Builder's Resources), but there seems to be *NOTHING* there at all. Nada. Zip. Null. Zero. That is most odd, considering that the KX1 has been out for two years. In contrast, K1 and K2 owners will find a wealth of info there. 73, Mike / KK5F ___ 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] KX1 #01221 Alive but shy of stated power?
Hi All, Maybe my emails were not getting through. R11 and R30 mods in the KX-1 will increase output power but won't do amything for low transmitter power on 20M (etc). R11 can be changed to 3.3-5.6 ohms and R30 can be changed to 27-33 Ohms but do not exceed 33 ohms. I have this from Elecraft. After the mod you may have to back down R4 to keep power output below 4 watts. The KX-1 is not designed to take 5 watts Jay W6CJ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Morrow Sent: Thursday, August 04, 2005 10:37 AM To: Grif; elecraft@mailman.qth.net Subject: Re: [Elecraft] KX1 #01221 Alive but shy of stated power? Grif wrote: WHAT are the changes to R11 and R30 Everyone is referring to them, but no-one has said what they are!! Must be a dark secret, Grif. Nobody seems to want to tell, apparently least of all the folks who report having performed the mods! I'd help if I knew...but I don't have a KX1. I looked at KX1-related info on the elecraft web site (Tech Notes and Builder's Resources), but there seems to be *NOTHING* there at all. Nada. Zip. Null. Zero. That is most odd, considering that the KX1 has been out for two years. In contrast, K1 and K2 owners will find a wealth of info there. 73, Mike / KK5F ___ 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
