Providing HI CUT and LO CUT when SHIFT is configured for 10 Hz increments would require a substantial rewrite to the K3 firmware. If you'd like to use LO and HI CUT, for now you'll need to use 50-Hz steps.
73, Wayne N6KR On Jun 7, 2011, at 6:51 PM, Rich - K1HTV wrote: > 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:li...@subich.com] > Sent: Tuesday, June 07, 2011 19:42 PM > To: elecraft@mailman.qth.net > 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
