Some time ago I looked at power supply variation (using a scope), and I didn't see anything abnormal when comparing my 1K to my 5K (there was some small variation under load) , both of which run off of the same supply (Astron RM-35). Of course, this doesn't let the supply out of the woods, but it moved it lower down my list of possible suspects.
Tim's method is also a good way to check supply sag when under load, but it's also important to define what the test condition is. Tim, was this using the TUN signal? And if so, at what power? Thanks, - Jeff Tim Ellison wrote: > One other thing to do is use the <SHIFT>+<CTRL>+I to bring up the Information > dialog box and see what voltage is being shown during transmit. This is not > as accurate, but I will give you an indication of what might be happening. > > I needed to adjust the output voltage on my Astron RS-35M up by about 0.5 > volts and I still see a sage from 13.8 to 13.4 during transmit. > > BTW, I have an early FLEX-5000 and I don't hear the reported distortion > listening with a 2nd receiver. > > > -Tim > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ray, K9DUR > Sent: Thursday, July 10, 2008 12:25 PM > To: 'Doug McCormack'; flexradio@flex-radio.biz > Subject: Re: [Flexradio] TX Audio Quality Help, please! > > Doug, > > I agree that it probably is power supply related. > > In most of the comments, everyone has overlooked the fact that Jeff's radio > was sent back to Flex and thoroughly checked out, and the problem was not > found. However, nobody, including Flex, disputes the fact that there is a > problem when the rig is operated at Jeff's QTH. This means that the problem > is specific to Jeff's installation. It cannot be bias adjustment, design > flaw, or anything else within the radio itself. > > The power supply & associated wiring is the only factor that is different > between the 2 locations. > > The 1st thing I would do is put an oscilloscope on the DC power input at the > radio, not at the output of the power supply. But then, I suspect that he > has tried that already. > > 73, Ray, K9DUR > > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kb.flex-radio.com/ Homepage: > http://www.flex-radio.com/ > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kb.flex-radio.com/ Homepage: > http://www.flex-radio.com/ > > > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
