by jrhees » Wed Mar 19, 2003 11:41 pm
Paul,
I should probably explain what 'IR collision' is in case you haven't figured it out by now...
In your case, what is likely happening is this:
1. You press a button on your Remote.
2. Girder sees the event, and initiates an action.
3. The USB-UIRT transmits a new IR stream.
The problem arises that your remote may still be sending our IR energy (from step 1) even when Step 3 commences. The 'Wait for IR inactivity' option is supposed to help this.
Another potential problem created is 'receiver desensitization'. This happens then the equipment to be controlled in step 3 sees the IR energy from step 1 and adjusts its receiver gain (Automatic Gain Control) to the energy from 1. If too short of time elapses from when the IR energy from 1 above stops to when the IR energy from step 3 starts, the receiver may not receive the signal properly.
To help prove this, inseting delays in Girder should eliminate the problem. HOWEVER, be aware that these delays are only effective in proving the problem if you take care to *not* hold the remote button in step 1 very long -- try to press it just long enough for the event to be generated.
To help determine if desensitization may be occurring, try shielding your SAT receiver from seeing the remote you're using to generate the Girder event.
If the issue appears to be desensitization rather than IR collision, adjusting the carrier frequency or proximity of the USB-UIRT to the Sat receiver may help.
-Jon