[Elecraft] K3 display and IF with SDR14
Hi All, My K3 serial number 1401 dumped the display. I can get it to display for a few seconds sometimes but other times it is dead at start off. I've removed front panel and looked for obvious things and even tried cool it to see if it is a heat problem but no luck. I'm thinking it will turn out to be a bad LCD driver as it seems to be getting worse with time. Just bad luck I guess as already I got the bad board for the instability of the power output, a bad optical encoder and a bad 400 hz filter. Good thing for Ham Radio Delux as I was not able to see configuration data after doing a reset!!! On to an interesting topic. I've interfaced my SDR 14 to the IF output and have been having a great time looking at band activity and being able to select the qrg from the screen. I just wizz up to a cw signal and have set the center QRG and demod up so that the line in the middle of the screen represents the exact qrg so I can hear the sig on the computer and the rx at the same time. Here is the interesting part, When I apply filtering the IF on the spectrum analyzer shifts with the two filters. I have a 400 hz inrad filter 8 pole and a 200 hz Elecraft 5 pole filter.I've got the center set at 600 hz on the analyzer and have the filters set up properly in the configuration but there is a shift and as a mater of fact that occurs at the same time as there is a drop out when using the shift control as you roll through one filter than another. Can anyone shed some light on this? Thanks Bob Ansell K1WGM ___ 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
Re: [Elecraft] K3 display and IF with SDR14
there is a shift and as a mater of fact that occurs at the same time as there is a drop out when using the shift control as you roll through one filter than another. Can anyone shed some light on this? Yes, the correct BFO injection shifts depending on the width and center frequency of the roofing filter. SpectraVue allows entry of an IF offset, but not by mode, so you'll see this slight shift as you change width. 73, Lyle KK7P ___ 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
