TXDelay and problems to wake up repeater

If you encounter into problems with some user radios not being able to key up the repeater, check the repeater's TXDelay parameter!

At our local repeater we are using a former 9k6 PR data transceiver for TX which is really fast in keying up. At packet radio times we used a TXDelay of less than 5 (*10 ms) on it. The default setting of TXDelay=100 in MMDVM.ini caused some user radios not being able to wake up the repeater once it has keyed down after idle. However, when the repeater was already on air and idle, DMR communications worked stable. We performed a long investigation to identify the particular .ini setting which caused this issue. Reducing the TXDelay down to 50 (even 30 still worked well) solved the problem, all user radios are now able to key up the repeater, mostly with the very 1st CBSK.

73 de Bert