- #1
Sender123
- 9
- 1
- TL;DR Summary
- rf, analog, transmitter, receiver
Hello all,
Im trying to come up with a simple method (and design) for detecting (mostly and foremost next to transmitting) a (continued) HIGH or LOW state through a specific frequency, most likely in the 420-450Mhz range. Without the possibility of interference. Preferably analog, at least on the receiver side.
The range has to be a minimum of 1000m (but not much more) and the speed has to be at least around 1Mbits per second (although I am currently trying to avoid sending actual bits, as said above).
On the receiver side of things I thought, for a moment, about using a (possibly envelop detector like) design which would require receiving two separate frequencies at once (on two separate antennas) in combination with an AND gate. Which assumes a HIGH state if the two frequencies are present and the LOW state if they are not. However this still has a risk of interference.
Which might force me into a digital receiver (or transceiver) type of design with "bit" verification for the signal. The downside is that this adds complexity in several ways. It, for instance and among others, almost always requires a additional MCU on the receiver side, which is something I would like to avoid. Also the speed is not high enough on most of the receiver ICs in the suggested RF range. I didnt look at receiving transceivers for now as they always require MCUs. Again, I am not looking to receive information, only a continued HIGH or LOW state.
On the transmitter side it would likely (if technically feasible) require a more standard IC transmitter/transceiver type of design which would be driven from a MCU (CPU). However, again, these are also mostly made to send out bits, so this could turn out to be a challenge. The receiver would have to be able to translate a (possibly digital) signal into a analog HIGH state.
Does anyone have any suggestions on how to approach the (receiver and to a lesser degree transmitter) design in order to reach the requirements? Can I, for instance, add logic on the receiving side to detect the (analog or digital and logically modulated) signal? Modulation does require additional speed but it possibly can't be avoided to prevent interference?
Or should I direct my time and resources on a dual transceiver IC design (if actually available and feasible for this type of operation)? Also considering FCC regulations and such, although a simple analog receiver design in this range should not be a problem I think.
I sincerely appreciate any and all suggestions. Thanks.
Im trying to come up with a simple method (and design) for detecting (mostly and foremost next to transmitting) a (continued) HIGH or LOW state through a specific frequency, most likely in the 420-450Mhz range. Without the possibility of interference. Preferably analog, at least on the receiver side.
The range has to be a minimum of 1000m (but not much more) and the speed has to be at least around 1Mbits per second (although I am currently trying to avoid sending actual bits, as said above).
On the receiver side of things I thought, for a moment, about using a (possibly envelop detector like) design which would require receiving two separate frequencies at once (on two separate antennas) in combination with an AND gate. Which assumes a HIGH state if the two frequencies are present and the LOW state if they are not. However this still has a risk of interference.
Which might force me into a digital receiver (or transceiver) type of design with "bit" verification for the signal. The downside is that this adds complexity in several ways. It, for instance and among others, almost always requires a additional MCU on the receiver side, which is something I would like to avoid. Also the speed is not high enough on most of the receiver ICs in the suggested RF range. I didnt look at receiving transceivers for now as they always require MCUs. Again, I am not looking to receive information, only a continued HIGH or LOW state.
On the transmitter side it would likely (if technically feasible) require a more standard IC transmitter/transceiver type of design which would be driven from a MCU (CPU). However, again, these are also mostly made to send out bits, so this could turn out to be a challenge. The receiver would have to be able to translate a (possibly digital) signal into a analog HIGH state.
Does anyone have any suggestions on how to approach the (receiver and to a lesser degree transmitter) design in order to reach the requirements? Can I, for instance, add logic on the receiving side to detect the (analog or digital and logically modulated) signal? Modulation does require additional speed but it possibly can't be avoided to prevent interference?
Or should I direct my time and resources on a dual transceiver IC design (if actually available and feasible for this type of operation)? Also considering FCC regulations and such, although a simple analog receiver design in this range should not be a problem I think.
I sincerely appreciate any and all suggestions. Thanks.
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