Stephen, An important thing to remember here is 'IT WORKED BEFORE' - and you certainly did not change any relays as part of the upgrade.
If you had adequate power out before making the changes to the 17/15 meter bandpass, look there firstly and mostly. You did not touch the Low Pass Filters by doing the upgrade, so it should still be just fine. Possibilities -- C33 was damaged when it was installed - if you just pushed it into the holes (spaced wider than the capacitor leads), you could have broken one of the leads inside the cap, and it will not show physically. Check and recheck for any solder bridges. Do you find a nice peak on receive for each inductor on 15 meters (and each capacitor on 17) - if you find good peaks, the inductors and C30 and C36 are likely OK, but C33 is still suspect (replace it temporarily with a close value to check). Use a 'scope or RF Probe to measure the RF Voltages as indicated in the Transmitter Signal Tracing section of the Troubleshooting Appendix in the manual. Find out in which stage or section the RF signal gets lost and look in that area only. Comparing the RF levels with those on a working band is a quick and easy way to determine what the proper level should be (there may be some varition due to internal gain differences from band to band). Again, I repeat, do not monkey with stuff until you find out where the signal is getting lost and look most carefully at the areas you just changed - remember that it did work before. 73, Don W3FPR > -----Original Message----- > > I noticed that after doing the mods to upgrade K2 #402, I don't get any > output on 17 and 15 meters. > > I did change C30 and C36 to 470 uF, ,and C33 to 2.2 uF, which is part of > the 17/15 meter band pass filter mod change. > > However, receive seems fine. I just get zero Watts out in transmit. > > Since I think the low pass and bandpass filters are shared in receive > and transmit, I don't think its the filters. I wonder if a relay > went bad. > > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.323 / Virus Database: 267.8.11/44 - Release Date: 7/8/2005 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
