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Topics - ihmeyers

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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  :)

2
Equipment / Antenna Multi-Couplers
« on: December 05, 2013, 1858 UTC »
Looking for a recommendation on a good antenna multi-coupler.  What I want to do is split the lead-in from my vertical into three outputs

1) for fullband use (100khz-30 MHZ)
2) for LW use only ( I have filters to pass only 500khz and below)
3) for HF use only (I have filters to reject BCB and below)

The best multi-coupler I have seen is the Elad ASA-15.  I use one to feed multiple rx from the antenna switch's output.  I could buy another one to create the 3 outputs I need but they are expensive (~$450) and I really didn't want to spend that much.  It's been hard to find one that's reasonably priced (+/- $100-$150) that works from 100khz-30MHZ.

Any recommendations are greatly appreciated!

Thanks,
Ian  ;D


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