Receiver picking up the signal too slow.
Receiver picking up the signal too slow.
(OP)
I need to transmit a simple on/off signal a very short distance, like 1 ft. I'm using an rf600e/d set with a 434 mhz transmitter/reciever WRL-10534 . I have them wired up to a good omnidirectional antenna thats rated for 434 mhz. I have tested it over 200 ft and it works just fine. The issue I'm having is that I need the signal to be picked up as quickly as possible. Theres currently a good 1 second delay between the transmitter sending it and the receiver showing that it has a signal. What can I do to make this quicker? I don't see why it would have a delay that long.
RE: Receiver picking up the signal too slow.
The data format automatically includes a preamble, synchronisation header, followed by the encrypted and fixed code data then a CRC check. The actual packet size is 67 bits. Each transmission is followed by a guard period before another transmission can begin.
The WRL-10534 also indicates it operates at 4800bps, or bits-per-second. Add up that preamble, sync header packet, CRC, and maybe some additional wait in the receiver for it to determine another packet is not immediately following, and it may add up to a second or two.
If you need low latency in your application, you may need to design at a lower level than just buying a simple module, or select a module that provides all the source code and study and evaluate the chip set before selecting one.
RE: Receiver picking up the signal too slow.
RE: Receiver picking up the signal too slow.
Mike Halloran
Pembroke Pines, FL, USA
RE: Receiver picking up the signal too slow.
RE: Receiver picking up the signal too slow.
Why do you have to power cycle to get an input to work more than once? Sounds like something else is going wrong here...
Dan - Owner
http://www.Hi-TecDesigns.com
RE: Receiver picking up the signal too slow.
Let me explain what I mean by having to power cycle. The input works just fine normally but has some latency and I'm trying to get rid of that. Once the signal is picked up I can trigger it quickly with no delay. So I thought to myself, why not have a dummy signal constantly going on a dead output so that it never disconnects and I can get that quick delay. While the dummy signal is going I can get my trigger to work quickly with no delay but it only works once in this setup. I have to power cycle it in order to use the trigger again.
RE: Receiver picking up the signal too slow.
In other words, perhaps you could use less advanced technology (ON-OFF Keying, carrier sense).
The risk is that other signals may trigger your receiver.
RE: Receiver picking up the signal too slow.
Mike Halloran
Pembroke Pines, FL, USA
RE: Receiver picking up the signal too slow.
RE: Receiver picking up the signal too slow.
What do you mean by that statement? Is it in this case fast enough?
If so, at a distance of 1 foot, you are probably overloading the receiver AGC, which needs some time to adjust. Try wrapping the receiver antenna in aluminium foil and try again.
Benta.