Is there a signal length or bit length limit for irsend and can I increase it?

*Problem:
*I need to blast a signal that seems to repeat with no gap.
The signal has a Header, a 64 bit word, and a trailing '1' corresponding to
about a 600us pulse and a 190us gap and then it sends the 5000us pulse of
the header, again.

*What I tried:
*I have no receiver for the remote (see below 'background'), but have a
separate tool with which I can analyse the original signal, which is from
where I got the above.  I can also analyse the output of my lirc device with
irsend and check if the signals are essentially the same.
I tried setting flags to SPACE_ENC and to reduce the gap parameter in the
conf file to zero, but this did not work.
It either throws an error when restarting the lirc service and a short gap
is just ignored and a 8000us gap is added, anyway.

I then thought I can use raw_codes and just repeat the signal three or 4
times with the trailing one and the header in between.
The raw codes work for only one repetition, but when I try to repeat the raw
codes 2 or 3 times, I get an error 

transmission failed - Error running command: Input/output error

To be clear: with repeating the code in "raw_codes" I mean that I have
instead of 64+1 pulse space pairs + a trailing pulse that I have n x (64+2)
- 1 pulse space pairs and a trailing pulse, that is 197 pairs plus the
trailing pulse in the case of n=3.  (for one key-press)

*Question:
*Is there a way to achieve what I want with lirc?  Or do I have to give it
up.

*Background
*I must apologise for hacking and stretching the use of lirc a bit.  What I
am trying to simulate is a 433MHz on_off keying transmitter for a video
screen.  I use a bit-banging output device with no modulation for the
signals as "Lirc Device".  In principle, instead of a IR-Diode being turned
on and off, a 433Mhz transmitter is turned on and off at the rhythm of the
lirc output.
I managed to make it work for these RF controlled switches following the
homeeasy protocol.  But the screen I have is a bit special and, as mentioned
above, cannot be mapped to "standard remote protocols" as there is no gap in
between the 3-4 repeats.



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Sent from: http://lirc.10951.n7.nabble.com/