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XPR7550e MDC1200 DOS mute

Ant9270

Deranged Individual
Joined
Aug 31, 2018
Messages
221
I’ve been doing some experimenting with the DOS coast time/auto mute, and noticed on the XPR line that really no matter what combinations you use, sometimes the radio will mute with a rather odd chirp (not the regular DOS chirp) or just not mute at all and the full data packet will be heard. (I am aware that for MDC1200 signaling to work properly, it has to mesh with the system settings)

Long story short: Has anyone found a good DOS coast time/Auto mute for the XPR line if you do NOT know the system settings?
 

4-crime

Member
Joined
Sep 21, 2007
Messages
242
Location
NY, NY
I use a coast duration of 100ms and the auto mute duration is set to 150ms. This seems to work well for me. Sometimes the DOS muting does not always mute and the full MDC burst is heard, but for the most part it works perfectly fine this way. I also have the criteria type set to 1200Hz and 1800Hz.
 

Ant9270

Deranged Individual
Joined
Aug 31, 2018
Messages
221
I use a coast duration of 100ms and the auto mute duration is set to 150ms. This seems to work well for me. Sometimes the DOS muting does not always mute and the full MDC burst is heard, but for the most part it works perfectly fine this way. I also have the criteria type set to 1200Hz and 1800Hz.
I’ll give it a go. It’s definitely interesting how it sometimes mutes, and sometimes the full packet comes through like you said. I appreciate it.
 

chrismol1

Newbie
Premium Subscriber
Joined
Mar 15, 2008
Messages
36
Location
Saratoga
dos time of 268ms wasnt that standard or 270 in others I havent experimented in the xpr but works great on the xts
 

rescue161

KE4FHH
Database Admin
Joined
Jun 5, 2002
Messages
2,893
Location
Hubert, NC
I'm using the following and it mutes every time.

Criteria Type: 1200 or 1800
Coast Duration: 275
Auto Mute Duration: 500
Fixed Retry Wait Time: 0.0

This for the 7550 and the 5550.
 

4-crime

Member
Joined
Sep 21, 2007
Messages
242
Location
NY, NY
I'm using the following and it mutes every time.

Criteria Type: 1200 or 1800
Coast Duration: 275
Auto Mute Duration: 500
Fixed Retry Wait Time: 0.0

This for the 7550 and the 5550.
The one thing with having the auto mute duration set that high is that the radio takes longer to unmute on receive audio and you can miss the beginning of receive transmissions. Even at 200 on the XPR line I’ve noticed the beginning of transmissions cut off, but it seems to vary radio by radio. Strange, but it is something to pay attention to when making these tweaks/changes. It is also only affected if you have the radio set to decode under the channel personality tab and have your MDC system selected for RX.
 

rescue161

KE4FHH
Database Admin
Joined
Jun 5, 2002
Messages
2,893
Location
Hubert, NC
That's true, but my repeater is going through a link via ROIP, so there is quite a bit of a delay. Yes, the radio is set to decode as we use aliases for MDC ID.
 
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