Dash mount radio worked great as a bench radio. Installed in vehicle, remoted with PMLN5404A kit and 5 meter cable. On analog wide band ham modes, awful hum/buzz on transmit for the first 1-1.5 seconds before it levels out to regular audio. Tried moving to a separate Astron power supply to bypass the vehicle electrical system with same results. Upgraded to latest 1.x mobile firmware, same result. Disabled MDC1200 signaling in mode, same issue. XTL5000 in same vehicle on VHF works flawlessly, tied to same electrical point. Removed GPS antenna, same result.
Remote kit problem maybe?
Was able to find a hint of this same problem a couple years back on the forum but not resolution post:
Code: Select all
Re: XPR5550/5350 Hum on Transmit
Unread postby WB4JGI » Mon Apr 09, 2012 10:44 am
I have that same problem on my 4550 mobile on a UHF ham frequency. The hum will begin when I press the PTT and will stay for around 1-1.5 seconds.
Maybe they'll release that update for the older model radios. I'd love to upgrade to a 5550 I just can't due to there not being a remote mount option for it yet.