[Elecraft] K3 SSB - Is the 5 pole filter good enough

[Bill W4ZV]

Barry N1EU wrote:
> 
> Bill, I think the 2.9Khz bandwidth measurements for that filter were taken
> at r.f. - for whatever reason, that bandwidth is not translating into a.f.
> - I've seen a.f. measurements done on about 5 samples of the 2.7Khz filter
> and they all run several hundred hertz narrower than the 2.9Khz figure.
> 
> 73,
> Barry N1EU
> 
> 

Hmmm...I'll have to check mine again.  I set DSP to max Width (to take the
DSP filter out of the picture),  and used the internal K3 meter (AFV/dBV/AGC
Off) to measure the -6 dB points from an XG1 source.  I believe the internal
meter does read AF doesn't it?  Maybe I'm getting an average reading
including noise from the wide DSP bandwidth and should be using a narrow DSP
filter after disabling all filters but the 2.7k.  With the XG1 at 50 uV I
wouldn't expect noise to be distorting the measurement.

73,  Bill
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