One thing to remember with the M10 is that it belongs to the same family as the M120 and GM300.
Your fan(s) MAY be causing vibrations in the receive or transmit radio rather than radiated RF noise. There have been many problems with receive microphonics at high receive volume levels and weird TX noise in the series of mobiles. Most of the time, reseating the RF and logic boards on the interconnecting pin header and tightening PC board screws and RF shields will eliminate this. Randy WB0VHB --- In Repeater-Builder@yahoogroups.com, Peter Summerhawk <commcon...@...> wrote: > > Well I already cut the hole in the side of the cabinet so I guess its off to > rat shack for a AC fan. The DC one is just to noisy to be heard on the > machine. When in doubt modify right? Will the AC fan cut the noise I take it > after reading the passage on cooling Mike? I hope so as I want thins thing > in and mounted to get my boss off my back over all of this. > Thanks > Peter Summerhawk > > On Thu, Feb 19, 2009 at 10:18 PM, Mike Morris WA6ILQ <wa6...@...>wrote: > > > At 08:02 PM 02/19/09, you wrote: > > > > >Morning, > > >I have a couple of M-10 radios run together with a 12VDC fan keeping > > >them cool in the cabinet. However the power block has them all run into > > >the same line fed by the power supply. You can hear the noise of the > > >fan when you key the repeater. Would a filter help this on the positive > > >line of the fan? Or maybe a coil to filter the noise? I am at a loss as > > >to what might keep the system cool but also eliminate the noise of the > > >fan as well. > > > > > >Thanks for the help in advance. > > >Peter Summerhawk > > > > Unless you have a battery in the system to let the repeater ride > > out a short power failure the simplest thing to do is to swap the > > DC fan for an AC fan, and run the fan off the switched AC in > > the power supply. > > > > If you have to keep the fan on DC, well, I touch on fans and > > fan noise in my writeup on Mitrek interfacing. > > See this link: > > <http://www.repeater-builder.com/mitrek/mitrek-interfacing.html> > > and scroll down to the "Cooling" section. > > > > Mike WA6ILQ > > > > > > >
