spt87a wrote: > Been reading up on the Transporter power supply topic with great > interest - thanks to everyone for all the good info over the last few > years. > > My own Transporter throws a lot of noise which impacts AM radio > throughout my house. I moved last fall and didn't notice this occurring > at my last place so I believe the Transporter has developed this problem > recently. Wondering if this is an early sign of caps failing on the > power supply. Has anyone noticed this or can anyone comment if their > Transporter causes this same interference? I did have issues with mine > getting running after the move and ended up doing a full reset of it > (xilinx; try regular reset first which didn't help). It didn't want to > connect to WIFI even though it was the same WIFI router/name, etc. as > before the move. It has been ok since other than the AM noise. > > In my case - I have the Transporter in a rack below a Denon tuner. With > the Transporter plugged into power there is noise across the entire AM > band. Unplug the Transporter and it goes away. I have other nearby > devices - XBOX One, cable DVR box, TV, etc. and no noise from them. > With the Transporter plugged in again, I then try my tube based > 1950's/60's table radio in the kitchen and same AM noise which goes away > with Transporter unplugged. Pretty sure the noise is going thru the > power lines as I haven't noticed the problem with battery powered > radios. > > If no one has info on this I'll likely just try to recap the power > supply and see if it fixes it.
I guess the power supply could be part of the issue but if your Transporter is still working as it should, so is the power supply. Dying capacitors might have some components swing, but in my opinion that would not be in the range of radio frequencies. Anyway, what I dislike a bit about the Transporter's hardware design is that the aluminum case is not really properly grounded. The IEC connector earth terminal routes on the PCB to one of the nearby bolts that secure the board. The trace is rather thin, and the connection is at best weedy. Usually one would expect a beefy green/yellow wire that goes from the terminal directly to a solid nut-and-bolt connection in the bottom of the case using shake-proof washers and isolation material. Either that was too expensive or they just didn't know how to do it. So it might be good if you checked how well the connection from the metal case to the earth terminal actually is. With a bit of mechanical skills it would be easy to improve the situation by placing an additional grounding wire. The aluminum case itself is not actually airtight, around the Ethernet and serial IO there is some gap, that's also where the most dust accumulates over the years. But I would not assume that these slim gaps actually let unwanted RF emissions escape. If so, they would also be measurable or even audible in the Transporter's own analog outputs. Unfortunately I don't have equipment to systematically trace emissions from my Transporter, and no analog tuner in use anymore. An oscilloscope loop probe would be ideal to find out where exactly the emissions are coming from. Do you see any chance to get a hold of something like this? PN me if your Boom / Classic / Transporter display has issues! Blog: https://www.blogger.com/blogger.g?rinli=1&pli=1&blogID=5053304027701850753#allposts ------------------------------------------------------------------------ JoeMuc2009's Profile: http://forums.slimdevices.com/member.php?userid=23131 View this thread: http://forums.slimdevices.com/showthread.php?t=100509 _______________________________________________ diy mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/diy
