Adnan Yusuf wrote: > Okay the things is that I am using the sound-card and not the USB port > to input my data from the sdr mixer. The problem I have is that how do > I isolate my hardware device(sdr receiver) from noise generated by the > PC (i think because of the many oscillators that a PC has). The > problem is that the issue is not that the noise will enter in the > interfacing portion. But that it will directly affect my SDR > reception. Are there any good tips and techniques on how to make your > PC electromagnetically silent(so that it does not radiate its own > frequencies). > > For those of you who want to see the affect do this: > 1- shut down your pc and listen to any ordinary radio that you have > availabe > 2- no switch on the pc and "try" to listen to the radio. Just observe > how the performance falls. > > yours truly, > adnan yusuf > > Some PC's are terrible as far as noise, most of it comes from the power supply, so ferrite core, bypass capacitors will help, or sometime outright replacement with a quieter power supply.
On many though it's the monitor who is the culprit, easy enough to find out, tune to a weak signal that has bad noise, and while listening turn off the monitor, if most of the noise goes away then you need to shop for a LCD monitor, although all are not as clean, so take a battery power radio to the store and tune in-between stations and listen to the noise. You can use the same method with you PC to find out where most of the noise is coming from. -- Cecil K5NWA www.softrockradio.org www.qrpradio.com "Blessed are the cracked, for they shall let in the light."
