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Results tagged with frequency-modulation
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user 20218
For questions relating to frequency modulation (FM). This is a scheme where a carrier is modulated by varying its frequency to carry information.
2
votes
Range of FM and Power
If you are comparing AM and FM standard broadcast bands then there are a couple of reasons. AM broadcast is typically about 1MHz and FM about 100MHz and this makes a big difference.
In free space (no …
- 473k
2
votes
FM Signal Generation
The colpitts oscillator with varactor tuning is pretty good for audio and data. See above. I would recommend this method because I've used it several times for very low power data coupling. I've als …
- 473k
1
vote
Does the microphone input interfere with the headphone jack input?
I wonder if the mic input interferes with the headphone jack input?
I've added a few words (in red) to the circuit image found in your link: -
Can anyone explain this FM circuit further?
The text …
- 473k
0
votes
Question about FM and PM and Angle Modulation
From my standpoint, angle modulation can be FM or PM.
A continuous, progressive, linear angle change to the carrier's phase equates to a fixed frequency displacement of the carrier.
A step angle ch …
- 473k
1
vote
FM Transmitter and transmission
Use 1kHz for the input sinwave.... Probably about 50mV peak to peak. It depends on the electret mic so you should check what the mic tells you in the specification.
BB109 is a varicap diode. It is re …
- 473k
6
votes
Accepted
Simple FM transmitter
All BJTs have what is known as "miller capacitance". It can be "altered" by a greater or lesser reverse bias voltage across the collector-base region. Note that C1 shunts this small capacitance to gro …
- 473k
6
votes
Accepted
How to build an FM transmitter and how does it work?
How am I supposed to learn this stuff?
There are no short cuts and I would learn the following (but there's no guarantee I haven't missed anything from the list because I learnt this stuff decade …
- 473k
2
votes
Using a Dipole Antenna on a 50 ohm FM transmitter
The output is very likely to be an unbalanced type suitable for quarter wave antennas with a matching section. It's got half the impedance of the dipole i.e. 38 ohms and a simple 12 ohm resistor in se …
- 473k
1
vote
how to calculate the maximum radiated power for the FM broadcasting?
However, I am unsure on the radiated power.
In the govt.nz document you linked it says: -
(3) The maximum radiated power shall not exceed 0 dBW (1 W) e.i.r.p.
(4) Notwithstanding the provisi …
- 473k
1
vote
Final RF envelope of FM and AM are the same
Let me start by saying that the document you refer to compares AM with narrow-band FM and I would expect pretty similar results. Narrow-band FM is not used by music broadcast stations just in case you …
- 473k
0
votes
Is it possible to "cover up" a FM signal with your one?
In simple terms, if there are two competing FM carriers, then the one that will theoretically "win" has to be at least 6 dB greater in amplitude at the receiver antenna than the other. This is because …
- 473k
2
votes
FM radio Interference
While hearing FM radio at a at frequency of 106.4MHZ I can hear the
cockpit commands/voices daily when these IAF flights cross by.
The VHF airband (in most countries as far as I know) uses freq …
- 473k
0
votes
Accepted
Minimum threshold fm equation
Firstly there is no such thing as an FM antenna - an antenna doesn't understand the modulation method.
E\$_b\$/N\$_0\$ - what practical values are needed?
N\$_0\$ basically equals kT i.e. Boltzmann …
- 473k
1
vote
Accepted
Is FM index affected by frequency multiplication?
The baseband modulating frequency WILL NOT be affected when the modulated FM signal is passed through a frequency tripler. The deviation will of course. This means that the modulation index WILL BE mu …
- 473k
1
vote
Simple way to decoding FSK
This should be a comment but there isn't enough room.
Don't bother voting/down-voting on that basis.
The top trace looks like 1.6kHz (high) and the bottom trace looks like 1.1kHz (low). What equipm …
- 473k