RTL-SDR Low Pass Filter

[Titanium]

Just found this. Looks interesting and could be a great upgrade! Haven't tried it yet. Anyone up for testing?

Low Pass Filter for RTL-SDR Direct Sampling Mode http://www.rtl-sdr.com/low-pass-filter-for-rtl-sdr-direct-sampling-mode/

 

[spongella]

I have not noticed FM BCB interference in frequencies up to 14 MHz, or even up to about 30 MHz using the dongle. Maybe because I use an upconverter for HF.

 

[Comptech]

With a SDR or any consumer grade scanner front end overload is a major issue. In my case I can go to the 380mhz range and listen to my local FM stations. I can also hear NOAA across the whole spectrum. Here is the easy fix, look at par electronics. Dale custom builds filters to your needs. I have a weather tower 2 miles from me and quite a few high power FM broadcast stations broadcasting on a mountain less than ten miles from me. I suffered intermod something fierce. Dale hooked me up with a NOAA and a FM trap and now no intermod and can hear conventional channels 60 miles from here with mountians in between. Great products at a great price, and no I do not work for him or gain anything from this post.

 

[KE4EST]

Par Electronics is not very far from here, about a 45 minute drive.

 

[spongella]

Good information. I start seeing an occasional FM broadcast station starting about 30 MHz. I wonder if an FM trap like they used to sell at Radio Shack would work. A friend of mine bought one and said it worked well. Time to stop by the 'Shack and see. Thanks to the tip Comptech.

 

[Comptech]

It may work fine but I bet the insertion loss will be a lot more and the trap wont be anywhere near the exact frequencies.

 

[KE4EST]

Agreed, a wide-band filter off the shelf, we not give you the performance of one tailored to the part of the spectrum, YOU need blocked.

 

[spongella]

The Radio Shack FM trap, the one with 2 F connectors at each end has about 4.5 dB insertion loss.