All Questions
9 questions
1
vote
1
answer
64
views
Why is the USRP X310 spectrum noisy without an external bandpass filter?
I am using an Ettus X310 USRP with UBX160 daugtherboards to collect 100 MHz of instantaneous bandwidth at 3.1 GHz. When I run this setup without an external bandpass filter, the spectrum appears noisy ...
- 151
3
votes
2
answers
337
views
Why am I receiving a local tv channel on a CMB frequency
I am using a simple Baofeng H6 dual band radio and I programmed weather channels.
Well, on frequency 161.77500 I am actually picking up WGN, a local tv network.
This frequency should be reserved to ...
- 131
2
votes
1
answer
291
views
Receiving an Coded Odd Signal at 137.25MHz but don't know what it might be. It can affect my detection on NOAA 19. Need help
I am a newbie trying to detect NOAA 15, 18, and 19 satellites, which have downlink frequencies between 137 MHz and 138 MHz. I am using an SDR dongle and attached a photo of it to this post.
Of course,...
- 43
2
votes
1
answer
132
views
Buzzing FM interference
What kind of interference or other receiver issues can cause a constant buzzing noise (picket fence lines in the audio spectrum) in the demodulated audio of a received NFM VHF signal?
With AM, it ...
- 13.6k
2
votes
3
answers
1k
views
What causes my direct conversion 80m receiver to receive AM broadcasts?
I am making a Direct conversion receiver from this circuit at this website.
I made it for the 80m band and I changed:
The frequency of VFO to about 1.75 MHz
L1 and L2 to a bandpass filter for 80m
...
- 21
3
votes
1
answer
750
views
What is this odd data/screeching/fuzzy signal?
I was listening to a commercial FM radio station on 100.9 MHz, and this intermittent weird sound kept coming through it.
Here is a recording of it. The audio starts at about 15 seconds.
It sounded ...
2
votes
2
answers
104
views
different digital modulations interference. Does it happen?
Bottom line is I have got a very strange (but regular) reading on a < $1 type of ASK 433 MHz receiver. Have a look at it - those 3 spikes are sometimes caught by my receiver, don't know their ...
- 225
6
votes
3
answers
2k
views
How to stop interference on shortwave radio when connecting to a computer
I have a Tecsun PL-600 and when I can receive clear signals, and they come through just fine on headphones, and through the speaker. If I'm trying to receive RTTY or fax, when I connect the radio to ...
- 63
7
votes
2
answers
182
views
Apps and or equipment needed to document local interference?
A neighbor ham user recently started doing something that causes very noticeable feedback/buzzing in AM radio as well as any device that uses a wired microphone (such as a gopro with wired mic).
...
- 171