Rich, Maybe I'm missing something , but I use Bandwidth control and shift. 73 Ken K5DNL ---------------------------------------------------------
--- On Tue, 6/7/11, Rich - K1HTV <[email protected]> wrote: > From: Rich - K1HTV <[email protected]> > Subject: Re: [Elecraft] K3 Hi Cut & Low Cut granularity bug? > To: "'Joe Subich, W4TV'" <[email protected]> > Cc: [email protected] > Date: Tuesday, June 7, 2011, 8:51 PM > 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:[email protected]] > > Sent: Tuesday, June 07, 2011 19:42 PM > To: [email protected] > 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 > > > > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net Please help support > this email > > list: http://www.qsl.net/donate.html > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
