After successfully completing Part II of the receiver alignment and test I look back and see where I skipped R29 (10k) on the RF board bottom side. I installed R29's resistor at R19 instead. So R29 was empty and R19 held a 10k instead of 2.7k. Your most excellent method of orienting the resistors in a strip raised the red flag for me when I started installing resistors again. So much for my careful review and inspection. The Part II alignment came out excellent. Do these two errors affect the alignment results such that I need to go back and do the session over again? I hope it did not affect the 4 MHz Oscillator Calibration - I worked hard to find and use an external counter and hope not to re-do it. Thanks for any thoughts.
Bob Gordon KE5WZK K2 S/N 6667 |
Bob,
Those 2 resistors are not likely to change any of the alignments significantly, but do swap them because they could change the stability of the VFO. With respect to the 4 MHz Reference alignment, I would encourage you to re-do that anyway after the K2 is complete. Your attempts to set it at exactly 4 MHz, while good, do not assure you of accurate dial calibration. After you have everything together and working, I encourage you to do the steps in the K2 Dial Calibration article on my website www.w3fpr.com. You will not need an external frequency counter at all, but you will want to use Spectrogram or some other audio spectrum analyzer to get it "just right" and align your filters as well (an important part of the overall process). The settings in the manual will get your filters 'in the ballpark', but they do need to be refined. Wait until you have the KSB2 and the K160RX and the K60XV options installed if indeed you will be installing those options. 73, Don W3FPR Bob G. wrote: > After successfully completing Part II of the receiver alignment and test I > look back and see where I skipped R29 (10k) on the RF board bottom side. I > installed R29's resistor at R19 instead. So R29 was empty and R19 held a > 10k instead of 2.7k. Your most excellent method of orienting the resistors > in a strip raised the red flag for me when I started installing resistors > again. So much for my careful review and inspection. The Part II alignment > came out excellent. Do these two errors affect the alignment results such > that I need to go back and do the session over again? I hope it did not > affect the 4 MHz Oscillator Calibration - I worked hard to find and use an > external counter and hope not to re-do it. Thanks for any thoughts. > > Bob Gordon > KE5WZK > K2 S/N 6667 > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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