The output signal of the RF repeater is switched when the input signal is switched, but sometimes the received signal can be 'choppy' (Like any mobile radio signal, the signal strength varies wildly depending on terrain and the movement of the antenna)
That doesn't equate to the new requirement as described... if for example you have had good reception for say 5 seconds and then your signal starts to break up, because the DelayTime has elapsed the repeater will disengage immediately. You should have your Repeater timeout only START at the end of reception and if reception is re-enabled within the timeout period, then you simply go back to the start with the Transmitter still holding on. That way, as long as reception re-occurs within the 1 Second Time-Delay the repeater is still held on... so this now becomes (in a simplified form)...

Loop:
If InputTrigger=0 then OutputLine=0
If InputTrigger=1 and TimeDelay>1Second then OutputLine=1
Goto Loop

You should also consider a secondary feature... an additional timeout to disengage the Transmitter regardless if it has been held on for say 15 minutes continuously (in case of some localised lock-up in the repeater receiver from it's own transmitter).