Filter adjustments

[Tom Skinner-2]

Good Morning Group,

Following the excellent advice on this forum, I set my cw filters using spectrogram.

However, no matter how careful I am, my widest setting (at 160) always comes up a bit off - that is to say that when I tune in a signal to exactly zerobeat my 610 hz sidetone, the signal is spot on (so to speak) in the 80, 40 and 20 filters, but a bit off in 160.

Probably just my anal nature, but I would love them to all be on.

Any way to adjust just one of the filters without affecting them all - I have tried just doing the 160, saving that and restarting, but then the rest are out.

TIA,  es 73

Tom, KJ3D
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[Don Wilhelm-3]

Tom,

Are those numbers filter widths (i.e. 1.60, 0.80, 0.40 and 0.20), or are
they ham bands?  You terminology was a bit confusing to me.

Assuming they are filter widths, first know that a 10 or 20 Hz shift in the
tone when changing filters is normal.  While that slight shift can be
disconcerting when heard, it will usually pose no problem in actual
operation.

You can try changing the width of the filter and the BFO setting by one
'click' or so to force new values to be written into the EEPROM, ome folks
have reported that they have eliminated the pitch shift in that manner.  If
the BFO frequency is on the edge of one of the digital value steps, forcing
it to the next value will help, but this is trial and error, so I offer no
guarantee.

73,
Don W3FPR

> -----Original Message-----
>
> Following the excellent advice on this forum, I set my cw filters
> using spectrogram.
>
> However, no matter how careful I am, my widest setting (at 160)
> always comes up a bit off - that is to say that when I tune in a
> signal to exactly zerobeat my 610 hz sidetone, the signal is spot
> on (so to speak) in the 80, 40 and 20 filters, but a bit off in 160.
>
> Probably just my anal nature, but I would love them to all be on.
>
> Any way to adjust just one of the filters without affecting them
> all - I have tried just doing the 160, saving that and
> restarting, but then the rest are out.
>
> TIA,  es 73
>
> Tom, KJ3D
>

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[Vic K2VCO]

Don Wilhelm wrote:

> You can try changing the width of the filter and the BFO setting by one
> 'click' or so to force new values to be written into the EEPROM, ome folks
> have reported that they have eliminated the pitch shift in that manner.  If
> the BFO frequency is on the edge of one of the digital value steps, forcing
> it to the next value will help, but this is trial and error, so I offer no
> guarantee.

I do it like this:  Let's say the 400 Hz filter setting results in a
pitch slightly different from the others.  Then I change the filter
width to be either 380 or 420 Hz. and move the BFO setting one click to
recenter it.  I have always been able to get them all the same by this
method.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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