Hi Geoff -

Unfortunately, my knowledge of electronics is less than stellar.  I am
working at understanding concepts of seismology.  As for
electronics.....well, I'll leave that for someone else.  I was hoping to
find an answer that would allow me to apply the SNR numbers I see to the
practical side of seismology.  I understand the simple concept of an
amplifier (boosting a signal), but unfortunately, I have no working
knowledge of their innards or how the individual parts work by themselves
and in concert with each other.

Bob H



On 11/3/07 4:50 PM, "Geoff"  wrote:

> Hello Bob;
>=20
> Have you ever heard of a low noise
> GaAs op amp that is designed to work
> like a op177G (typical opamp) or ??
>=20
> Signal to noise ratio should be easily found
> in google I think it simply is like
> Expectided MDL signal power / Ubiquitous Noise Power
> The higher the ratio the better the whatever.
> Possibly expressed in db.
> For power thats 10Log(Sig/Noi).
> The noise would be the reference point.
> If you can get a 120db (coopers)
> I think youd be in fat city.
> The higher the overall s/n ratio
> the smaller signals they can see.
> Like someone sneezing next door.
>=20
> :-)
> geoff
>=20
> ----- Original Message -----
> From: "Bob Hancock" 
> To: "PSN" 
> Sent: Saturday, November 03, 2007 1:16 PM
> Subject: Signal To Noise Ratio
>=20
>=20
> When downloading events through IRIS =AD Wilber II, I noticed that they lis=
ted
> the signal to noise ratio.  Most of the time the number was =AD1; however,
> there were other numbers listed.  I have some questions and hopefully
> someone can answer them.
>=20
>=20
> 1.  What is the significance of signal to noise ratio when looking at
> earthquakes?
>=20
> 2.  How is signal to noise ratio computed?
>=20
> 3.  What are the ideal numbers to look for and at what point does the dat=
a
> become unusable?
>=20
> Thanks
>=20
> Bob Hancock
>=20
>=20
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>=20


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)