NOAA reception issues.

betolley

Newbie
Joined
Sep 14, 2021
Messages
1
I bought a USB-RTL and can pick up radio stations and can see the signal transmitted from my gate opener.
I originally setup RTL-Sharp, WXtoimg, and orbitron with the pluing in orbitron to control the channel with doppler shift. When a NOAA 15 or 18 go over I can hear a signal but it is weak and I get a almost viewable image. I have made a youtube video showing my setup (I test outside but the video is inside to make it easier to see)

antenna Setup

Retry with SDR-Console and WXtoImg on a nother night. You can see the signal but it appears to be -40db is that kind of weak?

I tried again the other night with SDr-Console and WXtoImg.


Do you see anything wrong with my Antenna? Does the signal look weak? Any other ideas?

I know the satellite is at the right spot because I installed a app on my phone that shows the location and the signal gets stronger when I point it towards it.

At this location it looks like it is decoding but it isn't clear. It just shows this:

 

krokus

Member
Premium Subscriber
Joined
Jun 9, 2006
Messages
5,038
Location
Southeastern Michigan
Have you tried different orientations on your antenna? It may help, but a different antenna design would prove be better. Quadrifilar Helical or a Lindenblad, with the proper circular polarity might do the trick.
 

royldean

Member
Joined
Jan 30, 2016
Messages
436
Location
Schwenksville, PA
Ok, couple of things:

  1. Be sure to make attempts using NOAA 18 and 19, as they are stronger
  2. How long is your feedline? You are likely getting interference from you computer while running it that close to the antenna. Try to get it at least 5 or 6 feet away, if not more, from the computer
  3. That RTL-SDR is very cheap. Consider getting an RTL-SDR.com V3 dongle ($30, Amazon.com). They have many features that the cheapos don't have
  4. Be absolutely sure that you are "on frequency". I can see from the screen capture you made that the tuning is a little off
  5. If you are using orbitron to control the tracking, be sure that your base station location is correct, your clock is correct, and your TLEs are updated and current. Double check the position of the satellite with N2YO.com.
For a decent pass (over 45 degrees), you should get some pretty amazing decodes, regardless of your physical location. The below was captured using an RTL-SDR.com V3 dongle and homemade QFR antenna located in my attic (station is a Raspberry Pi running Raspberry-NOAA):
NOAA-18-20210914-225041-MCIR.jpg

[edit] I don't check these forums that frequently, so feel free to contact me directly. Email is my username at google's email service.
 

dlwtrunked

Member
Premium Subscriber
Joined
Dec 19, 2002
Messages
1,126
Two questions:
1. What is your gain setting in the software?
2. How close is your nearest FM broadcast station? Did you try an FM broadcast band notch filter?
 

PDXh0b0

Member
Premium Subscriber
Joined
Mar 31, 2020
Messages
118
Location
Aloha, Oregon
You are between two hills that are between two mountain ranges. Myself, I am between coastal & cascade ranges with all the local hills, My captures are hit and miss(totally waiting for the leaves to all fall) Best captures have been in the driveway 8-12ft up, laptop right below it, or at a park that is of higher elevation(received passes I never even see at the house) If you can, try somewhere like roan mountain state park. Another thing is the PC, main are rather old, borrowed a friends speed machine, everything worked so much better. clean up background processes and see if that helps.
 
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