Hi Don and Elecrafters! I built RF-probe already and have done some measurements. I will look into these measuremnts which Don recommended afterwards.
I did some DC-voltage checks last night. These are things I found to be off in RX mode. Power supply about 12.5 VDC: Control board (front panel removed) U6 P18 5 V (should be 0 V) U9 P1 0 V (should be 0.4* V) U10 P1 0.07 V (should be 7.7* V) P2 0.01 V (should be 5.0* V) P3 0 V (should be 5.0* V) RF-Board Q2 D 0.02 V (should be 0 V) Q17 D 1.5 V (should be 2-3 V) Q18 G 0 V (should be -1.0 V) S 1.45 V (should be 2-3 V) D 7.6 V (should be 6.3 V) Q21 E 1.35 V (should be 1.6 V) B 2.1 V (should be 2.3 V) C 11.9 V (should be 13.2 V) U4 P2 0 V (should be 2.4 V) U5 P1 5 V (should be 0 V) P2 0 V (should be 5 V) According to some old postings I tested the 8R line (J13 pin1). It doesn't go 0 V when TUNE is on. Same post pointed to U10A ALC-control and those pins seem to be wrong. Also PA0V pointed me to this direction. I already received advice from Elecraft's Gary and send this info to him too. 73 de Jukka, OH4MFA _______________________________________________________________________ Parhaat hakupalvelut yhdessä osoitteessa: http://www.eniro.fi/ Suomalaisten yritysten tuotteet ja palvelut: http://yritykset.eniro.fi/ _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com