Hello fellow Elecrafters. I have a question about which my curiosity is just getting the best of me. When I have the Sub Receiver on, linked, and all parameters the same between the two receivers, and I have the Balance control set in the middle, and then tune quickly across the band, sometimes it has a "whooshing" sound which makes it difficult to tune and listen. As I slow down, the whoosh gets much less noticeable, but it is still there as the tonal quality seems to slowly shift from bass to treble.
I have 2.8kHz roofers in both receivers as well as AM filters in both. All filter frequency shifts are set to 0.0, but I'm guessing that there is a slight phase difference between the two receivers and when they are tuned, the time differential in both VCOs settling down varies enough to make a noticeable difference. If I go to CONFIG:FLx FRQ and change the setting from 0.00 to 0.01, I can get the same effect without having to tune the two linked receivers. Of if I simply listen in either LSB or USB for a long time on one frequency, I can hear the background hiss tone going from bass to treble and back again at a very slow rate (This is most noticeable when no signal is within the passband, but who, in their right mind would use a Ham Transceiver to monitor an empty frequency!-- ooops, I guess that would be me!) Anyway, is my assumption about the phase difference between receivers a reasonable explanation, and/or is there anything I could do to eliminate the effect? BTW, without an antenna (or the wrong antenna, e.g. an 80 Mtr Dipole on 20 Mtrs), I cannot perceive it, but with a resonate antenna, the phenomena appears. I am using the same antenna on both receivers. Am I far off base on my assumptions, or is there a simple explanation which I have not thought of yet? Just Curious W4ISH Bill ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
