Questions tagged [fm]
Questions about Frequency Modulation, the analog modulation scheme commonly used for voice on VHF and UHF frequencies.
5
questions with no upvoted or accepted answers
2
votes
1
answer
304
views
How to use GNU Radio to demonstrate FM demodulation without baseband signals
Using GNU Radio, I'm currently trying to create a flow graph containing a simple demonstration of how FM modulation and demodulation works. Since the target audience is not accustomed with complex ...
- 21
1
vote
0
answers
465
views
LA1185 FM downconverter shows weird behavior
I've built FM CCIR/OIRT downconverter based on Sanyo LA1185 IC. I've used most famous schematics for it with slight modification (added DC blocking capacitor 1 nF rated on the output)
Coils L1 and L2 ...
- 221
1
vote
0
answers
91
views
Is it suitable to use DSSS in a narrow-band channel for a power-starved system
I want to build a system that can transmit data through 2-way radios as far as possible. I use the "line-in" as the input of the baseband signal in the transmitter and use the "audio out" as the ...
- 33
1
vote
0
answers
79
views
Receiving BFSK with 9.6 khz deviation on TS-2000 / ICOM(IC-910H) in FM mode
I have used Kenwood TS-2000 to receive BFSK signals with 3.3 khz deviation operating the TS-2000 in FM mode. Can we receive similar signals but whose BFSK deviation is 9.6 Khz using either the TS-2000 ...
- 173
0
votes
0
answers
60
views
High SWR at full height
I operate a low power FM radio station. I have always had issues with high SWRs. Recently I have purchased a new transmitter, new antenna, and new 100 ft cable from the same company assuming they ...
