David, If L3 and L4 do not peak the signal, you have a problem in the Bandpass Filter for 80 meters - correct that first before looking at the Low Pass Filter. You should find a peak even if there is also something wrong elsewhere. You can bypass the low pass filter by injecting a signal (or connecting an antenna at W1 or W6 so you can concentrate only on the bandpass filter.
First check that you have the correct inductors in L3 and L4 - they should be the same type as L1 and L2. Next, check all the capacitors in the 80 meter bandpass filter for proper values and good solder joints (C11, C12, C15 and C16), then check L5 carefully. If everything is correct, it should tune (you should find a peak - although not quite as sharp as the one for 40 meters). To check the relay without even knowing the pin layout, switch to 80 meters and then turn power off - check the resistance from the junction of D6 and D7 to the junction of C11 and C12, also check the resistance from W6 to the junction of C15 and C16 (both these paths should show zero ohms - check the schematic to see the paths). Checking the resistance of the complete path from one point to another checks the soldering too - checking directly at the relay pins may miss a bad solder joint, and soldering is a much more common failure than bad relay contacts. 73, Don W3FPR ----- Original Message ----- > Hello all > K2 #4320 > during recieve alignment 80 meters is very low and l3 > l4 have now effect on the strength of the signal. > Is this in the low pass filter I did a relay reset 065 > but that had no effect ... _______________________________________________ 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
