Re: [Elecraft] NG0R - K2 160m alignment problem.
Don and the members of the list, I am still troubleshooting the alignment issue. I am better now than I was a couple of days ago. Don and I have been comparing notes. I have removed the ATU from the circuit and tried some other things. After some poking around with the RF probe I have confirmed that the issue is within the 80/160m band pass filter. (Lots of RF into the filter... very little coming out.) I have been messing with C13/C14 making sure that they have a good connection. After some poking around with the probe I was noticing an occasional oscillation at which point the RF power levels would change and I would see some significant RF. It seems like L4 is extremely sensitive after the addition of the 160m module and C13/C4. Now if I move my hand or a plastic screwdriver by it the circuit is detuned or goes into a slight oscillation. That made it extremely hard to tune up the band pass filter initially. After some tweaking I am now seeing 11-13.5w out on 80m 160m without the ATU in the circuit. I am going to add the ATU back into the circuit and do some more testing. (The ATU was not the issue... it was removed as part of the troubleshooting steps.) Has anyone else noticed L4 being ultra sensitive after the addition of the 160m module? Thanks, JH - John Hoaglun NG0R - EN25 http://www.hoaglun.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] NG0R - K2 160m alignment problem.
Hi Don, It does not appear to have anything to do with the power setting. The LO P message is there at any power setting for 80m and 160m since the 160m module was added last night. I am assuming that LO P is a status that is read from the RF Product Detector circuit at the output the of low pass filter rail. I am assuming that since the other bands are working that with the W1 bypass removed that it indicates that J1:pin1 to relay K2 to J1:pin9 works as expected or there would be no RF for the other bands. My line of thinking puts the 160m LP filter or relay K1 as the issue... but that does not explain why 80m is a problem as well. Other debugging/troubleshooting steps? Thanks, JH - John Hoaglun NG0R - EN25 http://www.hoaglun.com -Original Message- From: Don Wilhelm [mailto:w3...@embarqmail.com] Sent: Monday, March 02, 2009 10:14 PM To: j...@hoaglun.com Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] NG0R - K2 160m alignment problem. John, There may be no problem - set the power to something grater than 2 watts. With the KAT2 installed, the K2 automatically limits the power to 2 watts for tuning. If your power setting is a bit below that, the LO PWR message may result. 73, Don W3FPR John Hoaglun wrote: I am having a problem with the 160m alignment. When I power up the radio I do not get any error messages. If I test the receive antenna via the menu I can hear the K2 relay open and close as expected. When I disable the ATU with the CALP/CALS setting and then try to engage the radio via the Tune button @ the 2w level I am getting a LO P message. --I am hearing signals on 80m and 160m. (160m sounds great on the K2.) --Using an analog DVM I see a blip on pin16 when I change bands which suggests that relay K1 is working. --I can also hear relay K1 when I switch between the bands. --If I put my finger on the relay I can also feel the relay move. At this point I think that relays K1 and K2 work as expected. --C75, C13, and C14 are installed on the RF board. --C68 and C153 on the RF board are installed and the proper values. --I used a solder pot when I prep'ed the toroids so I am confident that I have a good connection. 80m worked well before I added the 160m module. Now I get LO P messages on 80 160m. Any suggestions? - John Hoaglun NG0R - EN25 http://www.hoaglun.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] NG0R - K2 160m alignment problem.
John Hoaglun wrote: I am assuming that LO P is a status that is read from the RF Product Detector circuit at the output the of low pass filter rail. There is only an envelope detector there, but I would have thought, if you have the KAT2, that it was the forward power from the SWR bridge. A very mismatched load could, presumably, give a very low forward power. -- David Woolley The Elecraft list is a forum for the discussion of topics related to Elecraft products and more general topics related ham radio List Guidelines http://www.elecraft.com/elecraft_list_guidelines.htm __ 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
[Elecraft] NG0R - K2 160m alignment problem.
I am having a problem with the 160m alignment. When I power up the radio I do not get any error messages. If I test the receive antenna via the menu I can hear the K2 relay open and close as expected. When I disable the ATU with the CALP/CALS setting and then try to engage the radio via the Tune button @ the 2w level I am getting a LO P message. --I am hearing signals on 80m and 160m. (160m sounds great on the K2.) --Using an analog DVM I see a blip on pin16 when I change bands which suggests that relay K1 is working. --I can also hear relay K1 when I switch between the bands. --If I put my finger on the relay I can also feel the relay move. At this point I think that relays K1 and K2 work as expected. --C75, C13, and C14 are installed on the RF board. --C68 and C153 on the RF board are installed and the proper values. --I used a solder pot when I prep'ed the toroids so I am confident that I have a good connection. 80m worked well before I added the 160m module. Now I get LO P messages on 80 160m. Any suggestions? - John Hoaglun NG0R - EN25 http://www.hoaglun.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] NG0R - K2 160m alignment problem.
John, There may be no problem - set the power to something grater than 2 watts. With the KAT2 installed, the K2 automatically limits the power to 2 watts for tuning. If your power setting is a bit below that, the LO PWR message may result. 73, Don W3FPR John Hoaglun wrote: I am having a problem with the 160m alignment. When I power up the radio I do not get any error messages. If I test the receive antenna via the menu I can hear the K2 relay open and close as expected. When I disable the ATU with the CALP/CALS setting and then try to engage the radio via the Tune button @ the 2w level I am getting a LO P message. --I am hearing signals on 80m and 160m. (160m sounds great on the K2.) --Using an analog DVM I see a blip on pin16 when I change bands which suggests that relay K1 is working. --I can also hear relay K1 when I switch between the bands. --If I put my finger on the relay I can also feel the relay move. At this point I think that relays K1 and K2 work as expected. --C75, C13, and C14 are installed on the RF board. --C68 and C153 on the RF board are installed and the proper values. --I used a solder pot when I prep'ed the toroids so I am confident that I have a good connection. 80m worked well before I added the 160m module. Now I get LO P messages on 80 160m. Any suggestions? - John Hoaglun NG0R - EN25 http://www.hoaglun.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
