Hello all,

I'm a frequent browser of this site and am appreciative of the help I've gotten.

I have a Sony SAT-A55 Direct TV reciever. It works with both RF and IR. I was wondering if it would be possible to use the the ProntoPro and send the RF commands so that the reciever would work in RF mode.

I have read up on Dave Houston's mods that allow IR remotes to transmit RF, but would prefer not to go this route. This does not mean that I won't accept any/all of Dave's advice/knowledge.

BTW, I've scoured the Sony website and done some searches, and I can't seem to find the RF frequency that is transmitted by the remote (RM-Y802).

Any help would be appreciated. Thanks.

What is the FCC ID number on the RF remote?

If the RF frequency is not the same as the PP you'll need to build an RF2RF converter (assuming there are transmitter modules available).

If the Sony uses FSK, you're OOL as the PP only does OOK (AKA ASK or CPCA).

This message was edited by Dave Houston on 02/11/03 20:11.

Dave,

The FCC ID number is: L73RM-Y802

By FSK, I'm assuming you mean Frequency Shift Key? I'm not familiar with OOK or ASK or CPCA, could you elaborate. I am not an RF engineer, but I do know somethings about electronics and RF in general.

I tried looking at the manual for the frequency of the remote, but it's not listed.

Thanks for your help.

Yes, FSK is Frequency Shift Keying.

OOK = On Off Keying
ASK = Amplitude Shift Keying
CPCA = Carrier Present Carrier Absent

The latter 3 are more or less the same.

Your remote uses FSK. See...

[Link: gullfoss2.fcc.gov]

While it's possible to build a converter, it's not going to be cost effective. FSK receivers and transmitters tend to cost 10-20 times as much as ASK. Offhand, I don't recall seeing any for this frequency.

You would need an ASK 418MHz receiver and an FSK transmitter for 315.625-316.425MHz. If you are lucky, you can learn the codes as IR. If you're unlucky, you'll need to find an FSK receiver to learn the codes.

Thanks I guess I'm SOL!

Not completely.

Chipcon in Norway makes a single chip FSK transceiver. I'm familiar with the CC1000. I think they've added a few since then. They are remakably inexpensive.

If you can find the crystal needed for 315MHz you might be able to build something based on it. As I recall, 315 was on the lower margin of its range.

See...

http://www.chipcon.com