RadioReference.com Forums

I'm using an RTL-SDR v4 dongle with SDR# too capture signals from two nearby MCPs for a mobile ATCS Monitor setup to know when trains are coming. Both MCPs are about 1 mile from my location and I am able to receive signals from both using the dipole antenna that came with the dongle. However, I can only get ATCS monitor to read from one MCP at a time unless I tweak the frequency in SDR#. I'm wondering if there's a setting I'm missing that will allow SDR# to pick-up both nearby frequencies w/o having to manually move between the two.

To clarify, these are the two MCP frequencies I'm listening to which are both on the same rail line and both about 1 mile from my house:

• South Rugby: 896.990 or 896.9875 w/ -3 ppm correction
• North Rugby: 896.895 or 896.9875 w/ -2 ppm correction

As you can see, both frequencies are pretty close to each other and I would've thought they'd be exactly the same because they are both for the same railroad on the same line and both should be 896.9875, but I digress. I can only pick-up one MCP or the other if I change the frequency slightly in SDR# or change the frequency correction (ppm) setting from -2 to -3 if I use the same frequency.

Is there a setting in SDR# that I can change so that both MCPs can be read w/o changing the frequency or the frequency correction settings?