TX delay - MMDVM HS Hat 3-4 seconds missing

[DK4MH]

Hello OM´s and YL´s,

I am Marcus, 38 years old from southwest Germany.

I am using a single and a duplex MMDVM Hotspot.
For the duplex I use a Pi 3b and for the single hat a pi zero.
Both configured for DMR and Pocsag.

The duplex is running very well!!
The single hat has a delay from round about 3-4 seconds.
With delay I mean the first seconds are missing totally.
I tried from different repeaters und different OM´s by counting from
1 to 10. Everytime the transmission starts after ~3-4 seconds.
It is not that I just have to wait a bit longer that the transmission starts, no, the first seconds
are missing completly from the qso. I tried several adjustments and parameters, without success.
Does anyone has an idea?

Thanks in advance, best 73,

Marcus de DK4MH

[G6FIR]

Hi Marcus,

I'm very new to Pi-Star and DMR (only started this week). However, I notive that in Configuration->Expert->MMDVMHost->Modem settings there are items for TXDelay and DMR delay. Mine are set to 100 and 0 respectively.

[DK4MH]

Thanks for trying to help me.

I played with all adjustments and parameters whitout success.
May there is another idea?

best 73, Marcus

[DK4MH]

I made an update to the beta version, also without success.
Am I the only one with this problem?

regards
Marcus

[EI2GLB]

Any update on this issue ???

[AF6VN]

Try with POCSAG turned off... That is, with only ONE mode active. Just a wild guess, but with two modes active you might be running into hang time conditions where the unit is trying to determine if data is DMR or POCSAG. You may want to tweak the "hang time" for the modes you have active.

Do you lose the start when the status reads "Listening DMR" or only when it reads "Listening".

If you swap the MMDVM hats between the two R-Pis, does the problem stay with the hat, or stay with the R-Pi? If it stays with the R-Pi, then you may need a faster R-Pi for your configuration. After all, you have one system on a 1.2GHz QUAD-core processor with 1GB of RAM, while the other is a mere 1GHZ SINGLE-core with 512MB of RAM.

It may just be a problem with the radio you use to access the system... cf: viewtopic.php?f=5&t=2677#p13033 in which that poster states a loss with a Motorola radio, but not with an AnyTone radio.