[Elecraft] Err TXF

[Bill W4ZV]

Bill W4ZV wrote:
> 
> All you need is a steady signal source like the XG1 since there's a meter
> internal to the K3 with 0.1 dB resolution.  Just remember to set WIDTH to
> maximum (which takes the DSP filter out of the equation), set the internal
> meter to 0.0 dBV in the filter center, and note the frequency difference
> for both -6.0 dBV points.
> 

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
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