Hi,
Amplitude Shift Keying (ASK), On-Off Keying (OOK) and Amplitude Modulation (AM) mean almost the same thing and are basically just describing the method of transmitting data (it's a kind of fast Morse code). They say almost nothing about how well the data will be received. It's rather like saying only that you want "a car which runs on petrol", but there are many types of car and some may not give you a satisfactory journey (or perhaps arrive at all).
A good type of radio receiver to look for is called a "SuperHet." (superheterodyne) which your third link mentions. The simple, low-cost type to avoid is called a "SuperRegen." (superregenerative) like your first link (but I don't think the listing actually mentions it). SuperRegens generally have much lower range, but their main problem is that they output "garbage" (noise) when there is no signal being transmitted. That means the microntroller has to spend much of its time checking if there is a "real" signal or just garbage (when there may be proper "work" to be done).
To continue the analogy: SuperRegen might be considered like a 2-stroke engine and SuperHet a 4-stroke. A 2-stroke might be alright for a moped or your lawnmower (although even many of those are 4-stroke now), but if you insist on buying a 2-stroke car, don't be surprised if you end up with a Trabant.
Cheers, Alan.
(19-06-2015, 13:11)JT118 Wrote: If I type "ASK OOK RF Wireless Receiver Module" into ebay.co uk all of these come up (and many others) and yet some pcboards in the images have FS1000 on the PCB, any advice please, which is which?
Amplitude Shift Keying (ASK), On-Off Keying (OOK) and Amplitude Modulation (AM) mean almost the same thing and are basically just describing the method of transmitting data (it's a kind of fast Morse code). They say almost nothing about how well the data will be received. It's rather like saying only that you want "a car which runs on petrol", but there are many types of car and some may not give you a satisfactory journey (or perhaps arrive at all).
A good type of radio receiver to look for is called a "SuperHet." (superheterodyne) which your third link mentions. The simple, low-cost type to avoid is called a "SuperRegen." (superregenerative) like your first link (but I don't think the listing actually mentions it). SuperRegens generally have much lower range, but their main problem is that they output "garbage" (noise) when there is no signal being transmitted. That means the microntroller has to spend much of its time checking if there is a "real" signal or just garbage (when there may be proper "work" to be done).
To continue the analogy: SuperRegen might be considered like a 2-stroke engine and SuperHet a 4-stroke. A 2-stroke might be alright for a moped or your lawnmower (although even many of those are 4-stroke now), but if you insist on buying a 2-stroke car, don't be surprised if you end up with a Trabant.
Cheers, Alan.