Re: K3 Filter problem Part II

Posted by Richard Ferch on
URL: http://elecraft.85.s1.nabble.com/K3-Filter-problem-Part-II-tp3807347p3809502.html

Aha, looking at it more closely, I now see that it it only happens when
PB CTRL is set to SHIFT=.01, in either CW or DATA mode.

Oops! I just re-read the firmware release notes for MCU version 3.25,
which say that CONFIG:PB CTRL is not compatible with CONFIG:SIG RMV. No
doubt that's the problem here.

My apologies, then - it does not happen in the default configuration,
but with the current version of the firmware it happens when you have
CONFIG:PB CTRL set to SHIFT=.01 .

So I'd suggest to Tom that he check to make sure CONFIG:PB CTRL is set
to SHIFT=.05 before using CONFIG:SIG RMV. However, given his description
of a "reverse-direction" birdie, SIG RMV is definitely worth trying on
that birdie.

73,
Rich VE3KI


Wayne Burdick wrote:

> SIG RMV does not move "real" signals. It shifts the internal signal
> sources such that the net is zero. All you will hear is a slight change
> in filter center pitch.
>
> That said, it should, as you noted be used after checking cable
> orientation.
>
> 73,
> Wayne
> N6KR
>
> ----
> http://www.elecraft.com
>
> On Oct 12, 2009, at 7:47 AM, Richard Ferch <[hidden email]> wrote:
>
>> Bill W4ZV wrote:
>>> Bill W4ZV wrote:
>>>>
>>>> Have you tried CONFIG: SIG RMV?
>>>>
>>>
>>> This was implemented in MCU 3.03 / DSP 2.10,
>>> 3-17-2009...documentation here:
>>>
>>> http://www.elecraft.com/K3/k3_software.htm
>>>
>>> (K3 Firmware Release Notes, just above "New Firmware Load Information")
>>>
>>> 73,  Bill
>>
>> Warning: CONFIG:SIG RMV can have side effects. In addition to moving
>> fast-moving birdies right outside the bandpass, effectively eliminating
>> them, it also moves real signals by a smaller amount.
>

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