http://elecraft.85.s1.nabble.com/K3-Hi-Cut-Low-Cut-granularity-bug-tp6451499p6452191.html
I disagree ... I regularly use shift/width for CW and FSK_D and HI/LO
for SSB/DATA_A. I don't see the need for width steps less than 50 Hz
... Joe, W4TV
> Joe,
> I'm aware of the SHIFT granularity being settable from 50 Hz to 10 Hz. What I
> was questioning is why, when this change is made, that the K3's HI CUT and LOW
> CUT controls are disabled. After you set CONFIG:PB CTL to 10 Hz, when you press
> either HI-CUT or LOW-CUT. nothing happens and you can no longer roll off either
> side of the passband as you could when PB CTL is configured to 50 Hz. Is this
> an undocumented feature? If so, I think it is a bad one.
>
> 73,
> Rich - K1HTV
>
> = = =
>
> -----Original Message-----
> From: Joe Subich, W4TV [mailto:
[hidden email]]
> Sent: Tuesday, June 07, 2011 19:42 PM
> To:
[hidden email]
> Subject: Re: [Elecraft] K3 Hi Cut& Low Cut granularity bug?
>
>
>> 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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