oops.... you're right... now that I look through the scattered pile of paper under the bench.... never mind... at least I was looking at the right signal ;-)
Thanks Greg. On Sun, 2005-03-06 at 18:23 -0500, W3FPR - Don Wilhelm wrote: > Greg, > > Take a look at the K60XV errata sheet, and look for the 470 ohm resistor > that is supplied with the K60XV - that resistor is to replace R6 on the KAT2 > board. > > The problem is that all options that drive the VFRDET line except the KAT2 > use tri-state drivers, but it would be difficult to change the KAT2 to a > tri-state driver - so the KAT2 output interferes with the K60XV output > signal when the K60XV is active. The increased value resistor almost > eliminates the interaction and does not hurt the KAT2 when it is used. > > 73, > Don W3FPR > > > -----Original Message----- > > > > With the tuner plugged in, the ALC voltage, on pin 6 of J13 on the > > K60XV, varies from 0.820V at minimum power to 2.971V (Fluke 8060A with > > current calibration sticker, all the digits are correct) when it stops > > going up, at .70 mW indicated, it looses ALC control. > > > > With the tuner unplugged, it seems happy, ALC runs from 0.811 to 3.505V > > when it's claiming to be making 1 mW (it really only makes 0.820 mW but > > I can live with 0.8 dB low. I'll work on calibration later). > > > > I looked at the tuner, R6 (47 ohms) is present and correct. R6 > > "isolates" the ALC buss from the low output impedance of the LM358 that > > makes the forward power indication on the buss. > > > _______________________________________________ Elecraft mailing list Post to: [email protected] 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
