I've had the sub installed for about 2 weeks and it seemed to be working as expected. I've only been using CW and headphones. Although I have a 1K filter in the main for now I've disabled it leaving the sub and main both with 250 and 2.8K 8pole filters only in slots 5 and 2 respectively.
Tonight however the sub audio output is significantly lower. I've checked and the sub is using the Ant1 input. If the receivers are linked and the sub is on the audio is shifted toward the main. If I turn the sub off the audio is centered between the L/R so it's not my ears, audio amp or headphones causing the loss. Tonight may have been the first time I checked 40m operation and I was surprised to find 40m nearly dead on the sub when the 250hz filter was engaged. As I raise and lower the RF gain (set to adjust both simultaneously) I find the sub in the right channel loses all band noise long before the main in the left ear. All AGC settings have been returned to factory defaults which I presume affects main and sub simultaneously. Weak signals appear in the main (left) channel only, stronger ones appear in both channels but always favoring the main (left.) I suspect once the sigs are strong enough AGC on the main/sub flatten them to nearly the same level. Turning off AGC seems to reduce the imbalance but it is still favoring the left channel. Also when I lower the RF gain all the way down and turn up the AF (I have AF gain set to high) I can hear some squealing in the right channel along with some "white noise" that isn't there in the main (left). I also notice that with the RF left all the way down if I open the bandwidth all the way open on the sub and the main I can hear signals apparently blowing by the filters and producing audio and there is nothing on the main. I connected the XG2 and did a RF gain calibration on both receivers and results are still the same. Although I did the cal on 40m I couldn't find any information indicating that RF gain calibration is band specific. Any suggestions on what to try next? tnx jim ab3cv ______________________________________________________________ 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
