[Elecraft] K3 Hi Cut & Low Cut granularity bug?

[Joe Subich, W4TV]

> Also, when the SHIFT granularity (CONFIG:PB CTL) is changed from 50Hz
> to 10Hz, > the Hi Cut and Low Cut controls do not work at all! Is
> this a BUG ora FEATURE? I'm presently using K3 firmware update MCU
> 4.36 .

Feature ... as documented every since the 10 Hz steps for shift/width
was first provided in beta testing.

73,

    ... Joe, W4TV


On 6/7/2011 5:26 PM, Rich - K1HTV wrote:
> K3 Hi Cut&  Low Cut granularity bug?
>
> Lately I've been running a number of digital modes (JT65A, PSK31&  RTTY) on the
> HF bands. The K3's APF and dual PB filters really help to copy weak RTTY
> signals, especially when there is QRM. When using the JT65A mode, signals even
> weaker than -20 dB can be copied. These very weak signals are often effected by
> much stronger signals within the receiver's pass band. Often, these very strong
> signals will act on the K3's AGC and push the weaker signals farther into the
> noise, making them uncopyable.
>
> I have found that adjusting the K3's 'Hi' and 'Lo' cut filters to be the
> quickest and easiest way to reduce the QRM from adjacent loud signals. At times
> an offending strong station is very close to the weak signal's frequency. The
> 'Hi-Cut' and 'Lo-Cut' filters must be adjusted so they attenuate the nearby loud
> interfering signal but not the weak signal you are attempting to copy.
> Unfortunately, these controls can only be adjusted in 100 Hz increments.
>
> Although the SHIFT can be set up for 10Hz or 50 Hz increments, at present the
> granularity of the K3's WIDTH, HI CUT, and LOW CUT controls can only be set to
> 100 Hz in the CW&  Digital modes.
>
> Also, when the SHIFT granularity (CONFIG:PB CTL) is changed from 50Hz to 10Hz,
> the Hi Cut and Low Cut controls do not work at all!  Is this a BUG or a FEATURE?
> I'm presently using K3 firmware update MCU 4.36  .
>
> It would be very helpful if the 'Hi-Cut' and 'Lo-Cut' filtering could be
> adjusted in smaller increments than the present 100Hz.  Being able to fine tune
> the Hi and Low cut filters would really help to quickly and easily reduce QRM
> that might develop either above or below the digital signal being copied.
>
> I hope that this request can be implemented in a future revision of K3 software.
>
> 73,
> Rich - K1HTV
>
>
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