Hi Don & group I tried using a low pass filter between the K60XV and the 432 transverter and went thru the tune-up from scratch with similar results. I removed the LP filter.
I measured the K60XV out at -3dBM or about 50mW which what I say last night as well. I put it on my counter & analyzer and notice that it there is something at 18MHz that is about +8-10 dB louder than the 28MHz IF. --Interesting note. I then tried your second suggestion: I reconfigured the transverter for a high power IF input, JP3/JP4 2-3, and JP5/JP6 1-2, and the associated menu settings. Using port A on the radio I tried rerunning the transverter setup and got similar results. Common theme: TP5 has almost no reading on it while adjusting R22. Adjusting the inductors does not cause a significant change in TP5. (I can see it on the analyzer with a directional coupler on the output but it is a TINY signal.) Now I am really scratching my head. Thanks, JH -- John Hoaglun NG0R - EN25 http://www.hoaglun.com On Fri, 2010-08-20 at 08:35 -0400, Don Wilhelm wrote: > John, > > Try putting a low pass filter in the 28 MHz output path from the K60XV. > Most any with a cutoff frequency above 30 MHz will do. > Sometimes the transverter couples a bit of its output frequency energy > back into the K60XV and overwhelms the power detection circuit. If that > happens, the K2 'thinks' it is putting out the full 1 mW when in fact > the actual power out at 28 MHz is quite low. > > To verify that is the problem (rather than a problem with the > transverter), re-plug the jumpers in the transverter for high power > input and try using the BNC connector on the K2 to drive it. If the > transverter works in that configuration, you can surmise that the K60XV > power detection is the problem. One of the small in-line low pass > filters will cure it. > > 73, > Don W3FPR > > John Hoaglun wrote: > > Config: K2 (10w, SSB, K60VX, 160m, tuner, rs232) > > > > I have three transverters but I have had very different setup > > experiences. I am getting tired tonight so I have not doubt that I could > > be missing something obvious. > > > > My new XV144 was a very simple setup. The whole process took less than > > 30 minutes and is came up without any issue. > > > > I have an existing XV222 that was on a different IF rig for several > > years. I am reconfiguring it for the K2. I am getting virtually no power > > out of the XV222. No matter how many times I go back thru it I am > > getting the same result which about 15dBm. No combination of bandpass > > adjustments + PA bias + attenuator bring it up to where it should be. > > > > My new XV432 is exhibiting the same kind of issue as the 222 > > transverter...virtually no power. > > > > My jumpers on all three transverters are as follows: > > JP1: 1-2 > > JP2: 2-3 > > JP3: 1-2 > > JP4: 1-2 > > JP5: 2-3 > > JP6: 2-3 > > JP7: Open > > JP8: Short > > JP9: 2-3 (leaving the osc run for temp stability) > > > > 1. My initial feeling was that I am not getting enough drive into the 2 > > transverters. I checked the IF drive (in case I messed up the menu > > options for the 2 VX's) for 144/222/432 and the drive appears appears to > > be about .50mW/-3dBm for all three bands according to my Booton power > > meter. > > > > 2. That would lead me back into the transverter to adjust R22 (Input > > Atten Adjust) but that did not help. > > > > 3. That would lead to look at the jumpers (above.) I think that those > > are the correct values for a 1mW configuration. > > > > 4. Maybe there is something wrong with Q6 (what is the chance that it is > > an issue on 2 rigs?) > > > > > > Thoughts & suggestions? > > > > Please CC me direct in your response as I get the digest version of this > > list. > > > > Thanks, JH > > > > ______________________________________________________________ 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
