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XPR6550 Loud Uncontrolled Squeal

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User avatar
gatekeep
Posts: 202
Joined: Sat Aug 12, 2006 12:10 pm
What radios do you own?: XTS2500i III, AS III
Location: New York, NY
Contact:

XPR6550 Loud Uncontrolled Squeal

Postby gatekeep » Fri Jan 06, 2017 8:40 am

I have a few NOS dealer trade in XPR6550's on my bench that intermittently will (without warning) begin uncontrollable loud squealing from the speaker after receiving analog traffic.

Anyone run into this sort of issue? Some quick research seems to indicate this could be the result of a faulty volume pot or bad solder joints at the volume pot.
- Bryan
"So the best solution is to paint them to blue color and throw them to the sea?" in reference to MTS2000 F01/93.

TreyH
Posts: 70
Joined: Sat Mar 19, 2011 6:27 am

Re: XPR6550 Loud Uncontrolled Squeal

Postby TreyH » Sat Jan 21, 2017 4:43 am

Are they on firmware 1.12.17? There's talk of a bug in that firmware version causing that issue. I've experienced it on some of mine but that's been on a digital channel.

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W3AXL
Posts: 42
Joined: Fri Sep 04, 2015 9:02 am
What radios do you own?: an unhealthy amount of them

Re: XPR6550 Loud Uncontrolled Squeal

Postby W3AXL » Sat Jan 21, 2017 6:58 am

The "squeal of death" is a known issue in older firmware and the solution is to upgrade to the latest version. A decent amount of our radios had the problem and Motorola originally didn't know what was going on. Eventually they just told us that a firmware upgrade should fix the problem, which it seems to have done.

User avatar
gatekeep
Posts: 202
Joined: Sat Aug 12, 2006 12:10 pm
What radios do you own?: XTS2500i III, AS III
Location: New York, NY
Contact:

Re: XPR6550 Loud Uncontrolled Squeal

Postby gatekeep » Thu Jan 26, 2017 8:16 am

W3AXL wrote:The "squeal of death" is a known issue in older firmware and the solution is to upgrade to the latest version. A decent amount of our radios had the problem and Motorola originally didn't know what was going on. Eventually they just told us that a firmware upgrade should fix the problem, which it seems to have done.


What firmware revision? I have the radios loaded with R01.12.17 (exactly the version TreyH says it occurs on).

Side note: "Squeal of death" -- I love it.
- Bryan
"So the best solution is to paint them to blue color and throw them to the sea?" in reference to MTS2000 F01/93.

Gtaman
Posts: 43
Joined: Thu Jul 17, 2014 11:51 pm

Re: XPR6550 Loud Uncontrolled Squeal

Postby Gtaman » Sun Jan 29, 2017 4:55 pm

Mine does it. It's on 1.12.17. Not often but it has happened.

TreyH
Posts: 70
Joined: Sat Mar 19, 2011 6:27 am

Re: XPR6550 Loud Uncontrolled Squeal

Postby TreyH » Sun Jan 29, 2017 7:17 pm

I've been holding off upgrading our fleet for a while now, hoping to hear more about the issue. I may go ahead and update one shift and see how it goes. Firmware 1.12.13 doesn't have that problem but the only way to downgrade is if you have the Depot software. I'd like to go to 1.12.17 due to the AGC/Audio fixes that were implemented. Gen 1 radios below fw 1.12.17 using AGC don't seem to play well with Gen 2 radios.

User avatar
gatekeep
Posts: 202
Joined: Sat Aug 12, 2006 12:10 pm
What radios do you own?: XTS2500i III, AS III
Location: New York, NY
Contact:

Re: XPR6550 Loud Uncontrolled Squeal

Postby gatekeep » Mon Jan 30, 2017 6:28 am

TreyH wrote:I've been holding off upgrading our fleet for a while now, hoping to hear more about the issue. I may go ahead and update one shift and see how it goes. Firmware 1.12.13 doesn't have that problem but the only way to downgrade is if you have the Depot software. I'd like to go to 1.12.17 due to the AGC/Audio fixes that were implemented. Gen 1 radios below fw 1.12.17 using AGC don't seem to play well with Gen 2 radios.


Agreed. There is a DMR system I operate a few units on and I've found that the Gen 1 radios below the latest R01.12.17 firmware have serious audio quality issues (related to AGC and DSP as you stated) when operating with Gen 2 radios. I updated most of the radios to R01.12.17 and have gotten a few reports from the field that the squeal of death was occurring. So far my only suggestion to subscribers has been to pull the battery to immediately stop squeal or power off the radio normally (which also does the trick but takes longer).
- Bryan
"So the best solution is to paint them to blue color and throw them to the sea?" in reference to MTS2000 F01/93.


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