I have a sony f-v220 dynamic microphone, and i'm experiencing some hum in the recording, I tried googling it, but found nothing working. I have the spectrum analyzer on, and there isn't really any frequencies really high, here take a look I know it isn't a very good mic, but I don't think that I should get this much hum. Grabbing the mic in the hand doesn't make any difference. Is it the pc's fault? or the mic? or do you know how to solve this problem?
You can tell from the spectrum picture that you live in a country where 50 Hz is the AC mains frequency for your power outlets. If you set your analyser for a much slower sweep with tighter bandwidth resolution you'd see that coming through as a more definite and obvious peak. Try it. There's a slim possibility that it's 60 Hz but tightening the scan speed will resolve this.
You've also got a lump at between 500 Hz and 1kHz. Not sure what this is - it's loud enough to be heard but you might have to deal with the 50 Hz problem first.
What I can say is that it is interference and maybe your microphone isn't a balanced type or your connecting into an unblanced input. I don't know enough about the mic or your set up to tell.
An unbalanced mike input will be susceptible to stray magnetic fields from localized consumer goods and house wiring so maybe try switching off some appliances close by. I don't think it's electric field pick-up unless your mike cable is really close to the house wiring and any appliance wiring. If your house wiring has a really bad neutral connection and no earth to the outlets it could be electric field issues at a bigger distance.