Thanks for the link "remotecentral", I'll check that out. Here's a link 
to the remote that I started with.
http://diyirrepeater.blogspot.com/

Mine has a few minor changes, and modified that "C" firmware slightly as 
well.  All my stuff is available on request. This is a 6 port setup. 
There are 6 input ports that watch for a signal. The PIC sets a flag 
when there is a signal. As long as the flag is set (square wave high) 
all of the 6 outputs that have IR LED's are pulsed with a timing loop. 
It's all done in software. The "C" program is good documented. If you 
need anything else let me know. :)

Mark Perri wrote:
> Carl,
>
> I don't have personal experience with the directv remote, but have you 
> checked out http://www.remotecentral.com/ ?  They have a lot of info on 
> codes and protocols; someone there may be able to help you out.
>
> If I may ask, how do you have your PIC modulate your signals to 
> transmit?  I'm beginning to build a remote control as well.  Do you have 
> a dedicated port putting out 38 kHz and then another port generating the 
> codes, which you gate together with external hardware, or do you have 
> one port doing all the work?
>
> Mark
>
> On 12/12/2009 8:46 AM, Carl Denk wrote:
>   
>> I have an IR repeater based on a 18F4320 PIC, an Osram SFH 5410-38-Z IR
>> or equivalent detector that filters the 38 KHz carrier modulation, and
>> an IR LED transmitter. The PIC modulates the output. This all works good
>> with most IR (TV, VCR, DVD, etc.) equipment, but the Directv (older RCA
>> and new HR-21) equipment doesn't use modulation. If I replace the IR
>> detector with a plain photo detector, I can't get a range of more that a
>> couple of feet where I need 10 feet. The unit has 6 channels and
>> everything needs to be controlled from everywhere which prevents
>> programming a signal from 1 channel to output a modulated or not signal.
>> I haven't tried amplifying the photo detector output, but seem to think,
>> the noise from lights and sunlight will become a factor and not be usable.
>>
>> Any thoughts would be appreciated.
>>    
>>     
>
>   
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