TX delay - MMDVM HS Hat 3-4 seconds missing

Help with DMR issues
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DK4MH
Posts: 3
Joined: Sat Mar 07, 2020 3:12 pm

TX delay - MMDVM HS Hat 3-4 seconds missing

Post by DK4MH » Wed Mar 11, 2020 6:26 am

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
Posts: 5
Joined: Sun Mar 08, 2020 9:01 am

Re: TX delay - MMDVM HS Hat 3-4 seconds missing

Post by G6FIR » Thu Mar 12, 2020 12:06 pm

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
Posts: 3
Joined: Sat Mar 07, 2020 3:12 pm

Re: TX delay - MMDVM HS Hat 3-4 seconds missing

Post by DK4MH » Thu Mar 19, 2020 1:38 pm

Thanks for trying to help me.

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

best 73, Marcus

DK4MH
Posts: 3
Joined: Sat Mar 07, 2020 3:12 pm

Re: TX delay - MMDVM HS Hat 3-4 seconds missing

Post by DK4MH » Fri Mar 20, 2020 9:52 am

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

regards
Marcus

EI2GLB
Posts: 9
Joined: Tue Mar 17, 2020 12:51 pm

Re: TX delay - MMDVM HS Hat 3-4 seconds missing

Post by EI2GLB » Thu Apr 30, 2020 6:29 pm

Any update on this issue ???

AF6VN
Posts: 415
Joined: Fri Jul 20, 2018 1:15 am

Re: TX delay - MMDVM HS Hat 3-4 seconds missing

Post by AF6VN » Fri May 01, 2020 4:15 am

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.

--
AF6VN
Dennis L Bieber

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