Fw: Re: [Test-Equipment] Spectrum Analyzer BW measurement

Fri, 30 Jan 2004 15:53:43 -0600

Kees and group,
I would guess it depends on the shape factor of the filter.  The Marconi
uses crystal filters, should be very steep skirts!  This correlation
issue is  an ongoing problem when you look at specifications closely. 
Typically, these issues are ignored or at best overlooked.
Comments?
Regards from Arkansas,
Jim
An interesting side note, I joined this group when I started
troubleshooting my Marconi SA.  I just plugged through and found the 10
ICs that had given up the ghost in the logic unit and the uncountable
open via connections.  Took months of off and on effort.  Now I am
collecting test equipment to check power levels.  

On Fri, 30 Jan 2004 14:57:27 -0600 [email protected] writes:
> Wait a minute, that "actual BW is roughly the measured BW minus the 
> RBW
> applies only to the -3dB point". The -55dB point of the internal
> oscillator, when measured with a 500Hz RBW is 3.2Khz and when 
> measured
> with a 5Khz RBW it's 30Khz. Approx a 10x relationship which is the
> specified RBW ratio. So now how do I correlate to a 3Khz RBW 
> measured on
> a different SA ? 
> 
> 73 Kees K5BCQ