airtraffic

Author Topic: KSTL Approach update  (Read 326 times)

Offline geoffeg

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KSTL Approach update
« on: June 19, 2019, 05:39:58 PM »
After fighting with various USB audio input dongles and either having them be flaky or just not work at all with my raspberry pi I'm trying something new. I installed an RTL SDR dongle yesterday. It seems to pickup the approach frequencies on both the controller and aircraft side just as well if not better than the scanner I was using before. The only problem is getting bleed-over from SUS frequencies. The setup is in my hangar at SUS, less than a mile from the tower and I think the receiver just can't handle the power output from the transmitter at the airport. The RadioShack scanner I was using also occasionally had this issues, but not to the extent it's happening with the SDR. I might see if I can move it at a different location, farther away from the airport. In the meantime you'll hear STL approach and SUS clearance/ground/tower together. I'll be experimenting with some rtlsdr-airband settings but given the proximity to the transmitter I'm not sure there's much that can be done.

Geoff



Offline wiedehopf

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Re: KSTL Approach update
« Reply #1 on: June 19, 2019, 06:07:01 PM »
Reducing the gain might help with bleed-over from other frequencies.
Not sure though.

At the same time it will limit how weak a signal you can receive.
« Last Edit: June 19, 2019, 06:10:43 PM by wiedehopf »

Offline geoffeg

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Re: KSTL Approach update
« Reply #2 on: June 19, 2019, 06:25:07 PM »
Thanks. I took the gain down to 15 and was still getting bleed over. I might try messing with reducing it further and also reducing sample_rate. Testing is pretty slow since I have to listen to SUS clearance/tower/ground.