How do radio transmitter amplifiers work? Do they just multiply

Voltage and/or current, yes.

>>951268
Pardon my ignorance, but won't changing the current distort the amplitude of the radio wave?

>>951263
how about how does range work

>>951263
More specifics?
>Frequency?
>Mode?

>>951281
There's generally a high pass filter before the antenna which removes any DC component of the signal.

>>951351
Does only amplifying the current, without amplifying the voltage, lead to a more powerful radio signal?
Won't it just increase the amplitude of the radio wave, without increasing its strength?

>>951356
Honestly, I have no idea. I'm an undergrad in EE right now and while I intend on going to grad school for electromagnetics/ RF I don't know much about it at this point.


I was going to try to use Maxwell's eqns for time varying fields to derive some hypothetical for you, but honestly I dont know how correct it'd be.

>>951356
>increase the amplitude of the radio wave, without increasing its strength
???

>>951404
Aren't radio wave amplitude and radio signal strength different things?

File: LNA_schematic_04.gif (4KB, 407x298px) Image search: [Google]

4KB, 407x298px

>>951263
Read this brah
http://www.digikey.com/en/articles/techzone/2013/oct/understanding-the-basics-of-low-noise-and-power-amplifiers-in-wireless-designs

>>951416
Yes, signal strength is defined by the signal to noise ratio (SNR). So if the noise power is high but the signal power is low (low SNR), the "radio signal strength" would be low

source: RF receiver engineer

>>951356
For a given load (antenna), you generally can't amplify one without the other.

>>951421
This is wrong. Signal strength and SNR are different things. Signal strength is a measure of either received signal power or local signal intensity, depending on the context, while SNR is a ratio between this signal strength and the strength of background noise/interference.

>>951504
Radio frequency amplifiers tend to only multiply the voltage, though. Check linear amplifiers, for example.

>>951552
The output matching/filtering tends to hide that, if you aren't too much off from the nominal load impedance. Output voltage rises when you increase the load impedance, within reason.

>>951356
>amplifying the current, without amplifying the voltage
literally can't be done
>>951552
>only multiply the voltage
ditto