It took awhile to run this down. An explanation was found on the TYT MD9600 FACEBOOK GROUP.
The quick and easy fix: In General Settings in the software, on the left side of the window locate TxMode. Select Designed CH + HandCH in the menu box.
This should fix the issue.
Colin Durbridge posted:
Several people have commented that after updating to Firmware 5.03 there is a short delay between pressing the PTT and the radio actually transmitting. This appears to be a side effect of the new ‘TX Mode’ Setting found under General Settings. I was confused about what this actually did so I did some testing.
There are 4 possible settings
‘Last Call CH’
‘Last Call CH + HandCH’
‘Designed CH’
‘Designed CH+ HandCH’
Firstly, I think ‘HandCH’ should really read ‘Channel Hang’
This setting affects how the radio handles transmitting with the two A and B bands.
‘Designed CH + HandCH’
This behaves the same as the radio did before the update and does not have the observed extra delay on pressing the PTT.
The radio will normally transmit on the band you currently have selected. However if a signal is received on the other band and you press the PTT while the outlined A or D is showing then you will transmit back on that band. The length of time the outlined letter remains is determined by the setting ‘Channels Hang Time(ms)’ on the general settings page.
One special case is if ‘Channels Hang Time(ms)’ is set to zero. Then the radio will automatically switch bands to the active band whenever a signal is received.
‘Designed CH’
In this mode the radio will always transmit on the band you have selected. It does however seem to add the short delay to the PTT. The other band will still be received but you must manually switch bands to reply to a call.
‘Last Call CH’
In this mode the radio will always transmit on the band which received the most recent transmission regardless of which band you have selected. To temporarily override this you need to manually switch bands, the radio will then forget the last transmission and transmit on your selected band.
This is a confusing mode but it could be useful if you normally only respond to incoming calls and rarely initiate a call.
‘Last Call CH + HandCH’
This appears to be almost identical to the last. The only difference is that the outlined A or D lasts longer. It doesn’t seem to make any difference in practice.
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