1
Equipment / Images in LW Band
« on: December 19, 2013, 1941 UTC »
Need some help in troubleshooting some images I've got in the LW bands (primarily below 150khz). The images are of very strong locals (typical s9+30 or 40). The obvious answer is yeah, the locals are overloading the rx (it happens with all the radios in my shack). The reason I am stumped is that I have inline a pre-selector I built for LW that has a Clifton Laboratories low pass filter and a PAR low pass filter in series. The effect is to knock the two locals down to S1 (-100db on my SDR). That's why I am confused; if the filters reduce BCB by 90db or more how is there enough signal strength getting through to create the images? Should I buy a third filter to put in series with these two?
It's driving me crazy trying to troubleshoot it.
Thanks!!
Ian
Boynton Beach, Florida
It's driving me crazy trying to troubleshoot it.
Thanks!!
Ian
Boynton Beach, Florida