View Full Version : request for 58kHz Transmit version of firmware
October 29th, 2002, 10:13 PM
I'm just wondering if it would be possible to come up with a new version of the firmware that will support 58Khz transmit carrier frequency.
I know that to learn 58kHz will require a 58kHz detector but I don't really care about the learning part as most of my codes are Pronto Imports.
The reason I'm asking is due to the Echostar and Bell ExpresVu sattelite receivers use 58KHz for their remotes.
If I'm wrong is there anybody in the forum who succesfully controlled any of these units with the current hardware.
Thanks in advance
October 30th, 2002, 04:33 AM
Are you talking about the UIRT/2 hardware? If so, you really need to ask in the UIRT forum.
If you are talking about some other type of hardware, please elaborate. :)
October 30th, 2002, 09:58 AM
My posting in the general forum was a mistake I meant to post it in the UIRT forum.
But I guess the plugin would have to be modified to support the new frequency.
November 3rd, 2002, 05:56 PM
Okay seriously... someone needs to look into this. I've tried a dozen different imported pronto codes on my dish rx, and none of them work. I can do the exact same thing with my amp, and the technique works beautifully, but the dishnetwork stuff doesn't peep. My UIRT xmit LED is 1" from the sat box.
So if the problem is in fact the mod freq. (although I am skeptical about that), we really need to get that added into the UIRT code? (Carrier: 35,37,38,40,...56!!!).
Or is this problem related to the 'Denon Amp' thread, and possibly already almost fixed?
Anything I can do to help?
November 3rd, 2002, 10:07 PM
I also tried but to no avail! It does not matter what I do it does not work
It is definetly a frquency issue I hope!
November 4th, 2002, 06:57 PM
I'm afraid the UIRTs will not support 56 kHz. Actually the protocol has no room to insert a new "56kHz flag" and the PIC seems to be to slow to reach this speed with bit-banging. But maybe some UIRT-expert could say his suggestions about this.
It maybe possible to build an external 56kHz carrier circuit which could be switched on by one of the output pins of the UIRT2. This should work without modification of the firmware and the plugin. But you have to make some more commands to switch the carrier frequency before and after the actual send command.
Since I have no 56kHz device in use, I cannot probe this.
For me it seems time to start some new design sometime. A PIC16F628 for example is cheaper as the old PIC16F84 used by the UIRTs, has twice as much memory, a PWM generator which should make it easy to modulate a 56KHz carrier, an UART and some other usefull stuff. Only USB support is missing. So maybe a cypress device would be more uptodate but I'm more familiar with the PIC coding. :)
November 4th, 2002, 10:03 PM
I was thinking of a similar design of using an external timer to generate the modulation frequency but it is kind of dirty expecially when there are more powerful micro's arround that can do it internally.
The 16F628 also has a hardware UART that could also free up the micro to do other things instead of polling the serial input.
Another Idea I had circulating in my head was the gating of the main IR output using the GPIO pins and creating a multi channel transmiter/receiver.
This would be ideal if you have two IRD's next to each other and want individual control or want to implement a multi room control setup
Hmmm Only if I had the time.
November 5th, 2002, 02:41 AM
Or you could use more pins to get 58KHz input and the lower frequencies also. I actually don't know how easy it would be to determine which frequency is the right one. But it should be possible.
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