Ed, Yes, the most likely place for your problem is the Pre-Mixer bandpass filter adjustment. Since you have checked the oscillator outputs with your RF Probe, Use the RF Probe to monitor the output from the Pre-Mixer - adjust the Pre-Mixer for maximum RF Voltage at pin 6 of P1 on the filter board. This part can be done in receive. If you have a CW receiver that can tune to the Pre-Mixer output frequency, use it to verify that you are really tuned to the correct frequency - the correct frequency will be the K1 dial frequency plus 4915 kHz. You may have to bring an antenna wire connected to the receiver near P1 pin 6 to couple enough signal.
73, Don W3FPR E Neubauer wrote: > I am at the Alignment and Test - Part I portion of constructing the K1. All > of the tests went GREAT up to the part about Band-Pass Filter Alignment (page > 40). With the antenna connected, I hear only white noise through the > headphones. Adjustment of the slug-tuned inductors does nothing. Connecting > and disconnecting my antenna wire doesn't even make a crackle. I ran the > checks in the back of the manual with my RF probe under "Receiver and VFO > Signal Tracing" (appendix E pages 5-6). My input voltage with the battery > pack was about 11.5 volts. Here were the results for the numbered tests > under that section: > step 5: .02 V - OKstep 6: .222 V - OKstep 7: .025 V - a bit lowstep 8: 0 > volts - fail. > All steps after #8 that failed, as well. > I suppose there is something wrong in the premix band-pass filter, but am not > sure where to go from there to narrow the problem. Again, any help is > appreciated. > Ed > _________________________________________________________________ > Lauren found her dream laptop. Find the PC that’s right for you. > http://www.microsoft.com/windows/choosepc/?ocid=ftp_val_wl_290 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.339 / Virus Database: 270.12.55/2160 - Release Date: 06/07/09 > 05:53:00 > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
