XTL5000 O5 High Power VHF & UHF Audio Popping??

[trafficcop608]

Good evening, I have two XTL5000 O5 high power decks one vhf, one uhf that has an annoying audio pop/thump. The problem is present anytime a button is pressed on the radio or whenever the radio received audio. The button still beeps and the audio is heard; meaning if I push a button for an option. The radio pop>beep>pop , if a signal is received; pop>signal audio>pop , if the signal is on the fringe you get pop, pop, pop and a mixture of audio..you can see by now how annoying this can be.
I did a search and found some known issues with the Spectras back in the day. I also say some mention about doing a firmware update and correcting the defect. Any ideas? The 7/800 Xtl doe not have the defect. Thank you in advance.
*****

Can anyone help out with this one? I have seen some mentions of a problem back in the day with thumping on the Spectra line. The weird thing is both of my HP decks are doing it but my O5 7/800 is not, clean as a whistle…thank you in advance
I tried to upload the video but it wouldn’t work out. I uploaded it to YouTube. Here is the link
https://youtu.be/X-Jvs_sxUk4

Note: I do have all 3 of the radio speakers wired through a ground loop isolator and then through a mobile mixer and then to a Motorola amplified speaker. This allows me to have multiple inputs on one speaker.

 

[KN4EHX]

Can you swap the wires with the 7/800 just to test if that is your issue? I’d doubt it is a problem with firmware if this is a new development. Perhaps check the wires on your battery and alternator to make sure everything is tight. I’d start with the basics.

 

[trafficcop608]

Thank you for the suggestion, I did that with no change with the issue

 

[merlin]

A couple points: The 700/800 Mhz radios are NOT high power like the VHF/UHF counterparts.
The VHF/UHF high power radios are very different than other Astro series.
A very complex audio switching MUX and sounds like muting timing is not right.
My UHF has failed to the point there is no communication with the control head.
My belief is some failure within this switching MUX, like the bus lines loaded by 'boot TX/RX
More probing to confirm anything.
About speaker outputs. "DO NOT ground either lead, or tie to any other leads".