[Elecraft] Err TXF

[G4ILO]

Bill W4ZV wrote:
> 
> In case some have not discovered how to use the internal meter, below are
> some simple instructions.  This can be very useful for setting individual
> FLx Gain, if you want more resolution than simply using the K3 S-meter. 
> All you need is a steady signal source like the XG1 which will give you a
> reasonable meter strength (S5 or higher).
> 
> Turn AGC Off.
> Select Display = AFV and let it settle to a steady reading (value doesn't
> matter).
> Then select Display = dBV.
> Reading should be 0.0 dBV (+/- noise or stability of your source)
> Now you can compare in dBV at different frequencies (for bandwidth
> measurements) or different filter choices (for differential gain
> measurements).
> Don't forget to turn AGC back on afterwards!
> 
> If doing BW measurements on the crystal filters, you must first set the
> DSP BW using WIDTH to a value greater than the XFIL BW.  If you don't, you
> may actually measure the combination of the XFIL and DSP bandwidths. 
> Likewise if you want to check the DSP BWs, you must be using a crystal
> filter with greater bandwidth than the DSP filter you're measuring.
> 
> Just remember the K3 has 2 filters:
> 
> Input > XFIL roofing filter > DSP WIDTH filter
> 
> If you want to check either, you must set the other so it does not
> interfere with the overall measurement.  To force a specific XFIL, you
> must disable all other XFILs...just remember to reset them when done!
> 
> 73,  Bill
> 
I have barely discovered how to get it on the air yet! Thank you for this
explanation. The bit about disabling the wider filters also solves the
problem of how to use something like Spectrogram to see the frequency
response of just the crystal filter. I didn't think of doing that. :)

-----
Julian, G4ILO K2 s/n: 392  K3 s/n: 222
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
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