Golay
Member
- Joined
- Apr 28, 2016
- Messages
- 494
I really had something weird happen to me last week.
I'm in a digital QSO, on a XPR4550 on a power supply. All of a sudden the radio starts squealing while the other gentleman is talking. Loud enough to completely cover up what the other ham was saying. I reach for the volume, and as I do, the tone of the squeal changes. I could literally run the musical scale by where my hand was on or near the radio. Thinking "Oh great", I turned the radio off. Turned it back on, the squeal was gone.
Have used the radio half a dozen times since, hasn't done it again. Internal speaker. The mike wasn't keyed, was about a foot from the radio, and I wasn't holding the mike. Not getting a shock off anything when I touched the radio.
The only thing different is this:
About a month ago, the power supply quit.. It's the usual Antron power supply that Motorola sells for mobile radios, with the shroud on the top of it for the radio to fit into. Opened it up, the fuse was vaporized, the MOV was cracked. Did some googling. Bought and soldered in a new MOV, replaced the fuse, and the power supply has been fine. Reading 13.8VDC with no AC measured. Probably don't mean anything, but it's the only variable I can think of.
Any ideas what would of caused the radio to squeal?
I'm in a digital QSO, on a XPR4550 on a power supply. All of a sudden the radio starts squealing while the other gentleman is talking. Loud enough to completely cover up what the other ham was saying. I reach for the volume, and as I do, the tone of the squeal changes. I could literally run the musical scale by where my hand was on or near the radio. Thinking "Oh great", I turned the radio off. Turned it back on, the squeal was gone.
Have used the radio half a dozen times since, hasn't done it again. Internal speaker. The mike wasn't keyed, was about a foot from the radio, and I wasn't holding the mike. Not getting a shock off anything when I touched the radio.
The only thing different is this:
About a month ago, the power supply quit.. It's the usual Antron power supply that Motorola sells for mobile radios, with the shroud on the top of it for the radio to fit into. Opened it up, the fuse was vaporized, the MOV was cracked. Did some googling. Bought and soldered in a new MOV, replaced the fuse, and the power supply has been fine. Reading 13.8VDC with no AC measured. Probably don't mean anything, but it's the only variable I can think of.
Any ideas what would of caused the radio to squeal?