I am still fighting noise on 166.380. I know direction of the noise but can not identify the source. I understand that my CTT V3 uses sensor gnome software to set frequency of the funcube pro pulse sdr. The fun cube website suggest to use their FCD software along with SDR Sharp. I wonder what software sensorgnome is using to control the Funcube. What mode is set to decode, upper or lower side band or AM. If I knew that I may be able to determine were my noise id originating from. Thanks Glenn
Glenn Pollock 6736 laurel Omaha Ne 68104 402 203 5789 Hitchcock nature Center Creston Iowa. station number 542
Thanks you answered my question by these two lines
* it outputs I/Q samples as a USB audio device
* the SG uses its own software to analyze the I/Q samples and detect
Lotek tag pulses
Lot of software written by people much smarter than me to make Motus work. I am just an RF hardware ,antennas, receivers, coax, propagation and such. Now if I just can find the source of my noise and then how to stop it. Thanks Glenn
These are pretty narrow 8Mhz respectively 20Mhz filters around 166Mhz. They are just SMD components, so “some assembly required” onto a very simple PCB like
Dunno whether that’s up your alley and also dunno whether that ends up helping at all…
Another idea: you’re using the old Sensorgnome software, doesn’t that have a way to record a WAV file from the FCD? I seem to remember that there’s something in the web interface. You could record that and then look on your PC in an audio visualization app whether you can make out the interferer. You’re only getting ~30kHz of bandwidth IIUC so you will not see interference that is near enough to desensitize the FCD but far enough not to show up in that recording. Otherwise I’m afraid you need to hook up your laptop to the FCD and run one of the SDR apps that can display the typical spectrum analyzer visualizations to get a sense for which frequencies the interference is on and perhaps what it is. I don’t have experience with doing that but perhaps someone else can chime in? (It may be easier to use Laptop + cheap RTLSDR attached to your antenna to do this.)
Thanks for information. I have a spare Funcube SDR and using my lap top with SDR Console software using it as a spectrum analyzer. So can see the noise just do not know the source. The highest level of noise is on one antenna so have a and idea of what direction the noise is coming from. I installed a narrow band low insertions loss .5 db tuned cavity filter and had no effect on the noise. The noise causing the problem must be on 166.380 MHZ since the filter had no effect. I have been able to detect four birds so the noise is not so high that receiver is still functioning. I just like to see it working at its best. The receiver system is CTT with V3 software.
I am working with Iowa DNR were two of their CTT receivers on 166.380MHZ the noise is so high to render them useless. I do know that there is natural background noise.
I have been an amateur radio operator for over 50 years and worked as Biomedical engineering specializing in medical telemetry.
When it warm up my fiend and I will be using a hand help 166.380 MHZ yagi and receiver and do some hunt for noise source. Now if I do find the source stopping it may be a bigger problem.
No CTT 434 MHZ 32 bit FSK has no problems.
This has been a fund project for me and another of my ham friends. Keeps us out of the bars but climbing antenna tower might be a problem.
