Don, The manual doesn't state that you must adjust for 10 volts at TP5. Please read that section again.
It does say that you should not exceed 10 volts at TP5 during the bandpass filter tuning. If the output goes above 10 volts, use the input attenuator R22) to bring the voltage down - perhaps in the vicinity of 5 volts, and then continue to look for the peak tuning point for each inductor that is to be adjusted. Go back over the peaking procedure 3 or 4 times. After you have peaked the bandpass filters, you will then adjust the input attenuator to produce the correct output (use an external power meter which is accurate at 432 MHz) while your selected maximum drive level is applied from your transceiver. After that (and while the transverter is producing 20 watts), you adjust R10 (Power CAL) so the LEDs indicate 20 watts. These 3 steps must be done in order - do not skip ahead or you will end up with frustration. Also, do not drive the transverter for too long at a time - particularly during the final power adjustments. Give enough "break" time to let it cool between adjustment trials. 73, Don W3FPR On 8/6/2011 3:27 PM, W3MW Don wrote: > I've just finished assembly of the XV432 kit, interfaced to a K3, and ran > into two issues during alignment in Part VI, Filter Alignment. > > First, during CW key-down, the voltage at TP5 peaks immediately, then slowly > drops off until it is a volt or more lower than peak. Immediately re-keying > gets a somewhat higher voltage than at un-key, but not at the peak. Letting > it sit a minute or two, then re-keying, gets the original peak voltage back. > Output power does the same fade. > > Second, the 28 MHz filters don't seem to be aligning properly. I've set the > cans at the set-points in the manual, but L15 and L16 seem to peak with the > slugs out of the cans. L17 appears to peak ok, and the 432 filters both seem > to peak fine. At the best point of alignment, I am getting less than 7 volts > at TP5, vs, 10 required for full output. I've checked the K3 output, and the > BNC cables, both are fine. The input section of the XV is easily able to > overdrive the input to the 28 MHz filters, as evidenced by D10 and D11 > lighting up at roughly half setting on the input attenuator. Max output from > the PA is around 15 watts without lighting up D10 and D11. I've pulled and > checked the five caps around the filters, all are within tolerance. > Oscillator alignment was fine, 3v at TP1. I've tried re-aligning these three > cans several times, including bottoming out the slugs and working back up, > with no change. > > I'm on the air with it at the moment, and it seems to be working other than > the low power output. > > Any thoughts? > > Don W3MW > ______________________________________________________________ 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
