Re: [Elecraft] KX3 AND FILTERS
Noel, The 'roofing filters' do not impact the I/Q output. 73, Don W3FPR On 3/13/2018 7:34 PM, NOEL POULIN wrote: Hello I wonder if the optional 'roofing filters' is added to the KX3 if that effects the I/Q output bandwidth? __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] KX3 AND FILTERS
Hello I wonder if the optional 'roofing filters' is added to the KX3 if that effects the I/Q output bandwidth? Thanks very much Noel __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] KX3 roofing filters
Thanks to all for replies and tips. Turns out that the radio as I received it (factory assembled) had the “xfil3” setting for the roofing filters at “not install” rather than at “nor” I changed the setting to “nor” and now the roofing filters do kick in as I narrow the BW with the PBT control. 72, Jeff KB3DX __ 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
Re: [Elecraft] KX3 roofing filters
Re: ... I don't know how to tell if those filters are on or not? If all you want to do is check to be sure they are being selected properly, skip down to the third paragraph below where it talks about FL1, FL2, and FL3. If you want to be sure they are turned on (enabled) in the menu, then keep reading: Press and hold the DISP (MENU) button until the menu shows up in the main display. Rotate the OFS/VFO B know B knob until RX XFIL show up in the display, then rotate the Main tuning knob to get the display to read NOR for normal operation (filter working) or NOT INST if the filter is not installed. Exit the menu by tapping the DISP button. The filters may now be working, but it may be necessary to power the KX3 down and back on to get them to work. The manual isn't real clear on that. If you bought your KX3 at the same time you bought your filter module, the filters should be installed and the required opposite sideband suppression calibration should have already been done, even if your KX3 was a kit. If not, you will need to do that calibration after enabling the filters. That procedure is in the KXFL3 Installation and Calibration Instructions which is available on the Elecraft website. Once you do that, as you narrow the bandpass down using PBT I/II knob, the XFIL display in the main display just above the PBT knob (NOT the menu display noted above) will move from FL1 to FL2 to FL3 as you narrow the BPT down. BTW, I don't believe the filters make a great deal of difference in what you hear on the radio unless there is a very strong signal just outside your current passband. Someone who has used the radio with, and without, the roofing filters can probably provide better experience than I can. I have never operated without the filters installed. Mark KE6BB From: Gerry learygerrylear...@icloud.com Sent: Sat, Dec 7, 2013 at 4:34 AM To: Mark Petiford rv6am...@yahoo.com Subject: Re: [Elecraft] KX3 roofing filters I am a new KX3 user, but I don't know how to tell if those filters are on or not?Sent from my iPhone this time On Dec 6, 2013, at 10:24 PM, Mark Petiford rv6am...@yahoo.com wrote: Jeff, Be sure the filter module is enabled in the menu and then power-down the KX3 and power it back on. See Option ModuleEnables in your KX3 Owner’s manual. Mark KE6BB From: JEFFREY BLUMENFELDjeffreyblumenf...@mac.com Sent: Fri, Dec 6, 2013 at 4:43 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KX3 roofing filters I finally! got to power up my KX3 that I bought in February. Pathetic, really, but due to new job, lots of travel, etc. I have the KXFL3 roofing filters. As I understand the manual, the roofing filters should kick in automatically as I narrow the PBT. But mine don’t. Sorry for what is likely a very elementary question. Any guidance would be appreciated. 72, Jeff KB3DX __ 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
[Elecraft] KX3 roofing filters
I finally! got to power up my KX3 that I bought in February. Pathetic, really, but due to new job, lots of travel, etc. I have the KXFL3 roofing filters. As I understand the manual, the roofing filters should kick in automatically as I narrow the PBT. But mine don’t. Sorry for what is likely a very elementary question. Any guidance would be appreciated. 72, Jeff KB3DX __ 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
Re: [Elecraft] KX3 roofing filters
Maybe you have the RX SHFT set to 8 instead of nor in the menu? Or maybe you have dual watch feature enabled? Either of these will prevent the roofing filter from being engaged. 73, Matt VK2RQ On 07/12/2013, at 11:42 AM, JEFFREY BLUMENFELD jeffreyblumenf...@mac.com wrote: I finally! got to power up my KX3 that I bought in February. Pathetic, really, but due to new job, lots of travel, etc. I have the KXFL3 roofing filters. As I understand the manual, the roofing filters should kick in automatically as I narrow the PBT. But mine don’t. Sorry for what is likely a very elementary question. Any guidance would be appreciated. 72, Jeff KB3DX __ 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
Re: [Elecraft] KX3 roofing filters
Jeff, Be sure the filter module is enabled in the menu and then power-down the KX3 and power it back on. See Option ModuleEnables in your KX3 Owner’s manual. Mark KE6BB From: JEFFREY BLUMENFELDjeffreyblumenf...@mac.com Sent: Fri, Dec 6, 2013 at 4:43 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KX3 roofing filters I finally! got to power up my KX3 that I bought in February. Pathetic, really, but due to new job, lots of travel, etc. I have the KXFL3 roofing filters. As I understand the manual, the roofing filters should kick in automatically as I narrow the PBT. But mine don’t. Sorry for what is likely a very elementary question. Any guidance would be appreciated. 72, Jeff KB3DX __ 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] KX3 - Roofing filters
Thanks for your suggestions. Will try all this on a future SOTA group activation. 73 de Pierre VE2PID KX3 S/N 190 __ 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] KX3 - Roofing filters
Hello to all. Maybe that I don't understand the real utility of the roofing filter but I observed this. Last saturday, we were on a SOTA summit using two KX3s about 40 feet appart transmitting CW at 5 W. And even with the roofing filters on, we heard each other's sending as a diffuse noise. I know that changion RX shift to 8 disable the roofing filters, but we were not using that shift. So, am I missing something about the use of these filters? Are they designed for operations with operators near each other like SOTA activation on a crowded summit ? 73, de VE2PID KX3 S/N 190 __ 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
Re: [Elecraft] KX3 - Roofing filters
Hello Pierre, It is most likely not a roofing filter issue. Rather it is probably a local oscillator leakage issue. Set the RX ISO menu item to ON and I suspect the problem will significantly diminish, if not disappear. See page 38 of the current KX3 owner's manual (Rev B4) for this menu item and for a discussion of when it may be helpful. Be sure to first refer to the Tech Mode section on page 35 to unlock this menu item. 73 de JP WF4Z On Mon, Jul 23, 2012 at 10:34 PM, Pierre ve2...@videotron.ca wrote: Hello to all. Maybe that I don't understand the real utility of the roofing filter but I observed this. Last saturday, we were on a SOTA summit using two KX3s about 40 feet appart transmitting CW at 5 W. And even with the roofing filters on, we heard each other's sending as a diffuse noise. I know that changion RX shift to 8 disable the roofing filters, but we were not using that shift. So, am I missing something about the use of these filters? Are they designed for operations with operators near each other like SOTA activation on a crowded summit ? 73, de VE2PID KX3 S/N 190 __ 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
Re: [Elecraft] KX3 - Roofing filters
Pierre, The roofing filters may not necessarily help with such strong signal rejection as you would have had with 2 KX3s transmitting simultaneously on different parts of the same band. The usefulness of the roofing filters is to protect the receiver front end from normal level signals that are within the passband of the roofing filter, but not within the passband of the DSP filter. The result is AGC Pumping by the stronger signal which may not even be heard because the DSP filter cuts it out. 73, Don W3FPR On 7/23/2012 10:34 PM, Pierre wrote: Hello to all. Maybe that I don't understand the real utility of the roofing filter but I observed this. Last saturday, we were on a SOTA summit using two KX3s about 40 feet appart transmitting CW at 5 W. And even with the roofing filters on, we heard each other's sending as a diffuse noise. I know that changion RX shift to 8 disable the roofing filters, but we were not using that shift. So, am I missing something about the use of these filters? Are they designed for operations with operators near each other like SOTA activation on a crowded summit ? 73, de VE2PID KX3 S/N 190 __ 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
Re: [Elecraft] KX3 - Roofing filters
You didn't mention whether the two radios were on the same band, different bands, or odd harmonic bands like 40 and 15. Or, was it on any and all combinations? __ 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
Re: [Elecraft] KX3 - Roofing filters
Pierre, I think what you were hearing was low-level transmit phase noise. The KX3 has very low phase noise, but with the two radios on the same band and only 40 feet apart, during quiet conditions, the TX phase noise floor could be above MDS. Roofing filters won't help with this, but the KX3's new noise-reduction feature would (coming soon). Of course if you hear each other's VFOs at close proximity even in RX mode, you can turn on RX ISO (isolation amp). Adds 10-15 mA to current drain but drops the VFO leakage by some 70 dB+. 73, Wayne N6KR On Jul 23, 2012, at 7:34 PM, Pierre wrote: Hello to all. Maybe that I don't understand the real utility of the roofing filter but I observed this. Last saturday, we were on a SOTA summit using two KX3s about 40 feet appart transmitting CW at 5 W. And even with the roofing filters on, we heard each other's sending as a diffuse noise. I know that changion RX shift to 8 disable the roofing filters, but we were not using that shift. So, am I missing something about the use of these filters? Are they designed for operations with operators near each other like SOTA activation on a crowded summit ? 73, de VE2PID KX3 S/N 190 __ 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
Re: [Elecraft] KX3 roofing filters
Not a mechanical filter, but a low noise active audio filter running around 11 KHz prior to the ADC. The 4 selectable bandwidths will help keep unwanted off-signal energy out of the ADC. -Bruce, N1RX I think that I heard Wayne say at the Elecraft display in Dayton that they were mechanical filters. __ 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] KX3 roofing filters
Fellow Elecrafters: Does anyone have info on the KX3 roofing filters, i.e. how many can the KX3 contain??? Bandwidths??? Looks like the ultimate portable rig to mesure hope they can keep up with the expected demand (grin). 73, Joe W2KJ I QRP, therefore I am __ 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
Re: [Elecraft] KX3 roofing filters
From the new KX3 web page, the optional roofing filters: KXFL3 Roofing Filter Module (500/1500/2700/3800 Hz) The one option gives you all four roofing filters. Al N1AL On Thu, 2011-05-26 at 15:01 -0400, Joseph Trombino, Jr wrote: Fellow Elecrafters: Does anyone have info on the KX3 roofing filters, i.e. how many can the KX3 contain??? Bandwidths??? Looks like the ultimate portable rig to mesure hope they can keep up with the expected demand (grin). 73, Joe W2KJ I QRP, therefore I am __ 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
Re: [Elecraft] KX3 roofing filters
Ah. Extremely important point. NOT at all apparent from the KX3 page, especially when used to the one filter, one bandwidth paradigm. As it stands it reads like four available, but only one installable. On the web page, you may want to change... Narrow roofing filter option with four bandwidths (500 Hz, 1500 Hz, 2700 Hz, 3800 Hz) for excellent dynamic range ... to something like... Narrow roofing filter, single option containing four bandwidths (500 Hz, 1500 Hz, 2700 Hz, 3800 Hz) for excellent dynamic range 73, Guy. On Thu, May 26, 2011 at 3:25 PM, Alan Bloom n...@sonic.net wrote: From the new KX3 web page, the optional roofing filters: KXFL3 Roofing Filter Module (500/1500/2700/3800 Hz) The one option gives you all four roofing filters. Al N1AL On Thu, 2011-05-26 at 15:01 -0400, Joseph Trombino, Jr wrote: Fellow Elecrafters: Does anyone have info on the KX3 roofing filters, i.e. how many can the KX3 contain??? Bandwidths??? Looks like the ultimate portable rig to mesure hope they can keep up with the expected demand (grin). 73, Joe W2KJ I QRP, therefore I am __ 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
Re: [Elecraft] KX3 roofing filters
At 04:37 PM 5/26/2011 -0400, you wrote: Ah. Extremely important point. NOT at all apparent from the KX3 page, especially when used to the one filter, one bandwidth paradigm. As it stands it reads like four available, but only one installable. On the web page, you may want to change... Narrow roofing filter option with four bandwidths (500 Hz, 1500 Hz, 2700 Hz, 3800 Hz) for excellent dynamic range ... to something like... Narrow roofing filter, single option containing four bandwidths (500 Hz, 1500 Hz, 2700 Hz, 3800 Hz) for excellent dynamic range 73, Guy Hi, My interpretation is that the narrow roofing filter option is variable with 500, 1500, 2700, and 3800 hz steps that follow the DSP filter as it's bandwidth is changed. Jim, VE3CI __ 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
Re: [Elecraft] KX3 roofing filters
Jim Dunstan-2 wrote: My interpretation is that the narrow roofing filter option is variable with 500, 1500, 2700, and 3800 hz steps that follow the DSP filter as it's bandwidth is changed. These filters are ahead of the DSP at baseband. They protect the ADC from overload and should result in better Blocking Dynamic Range (BDR), which has been a weakness of most SDRs. 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/KX3-roofing-filters-tp6408290p6409018.html Sent from the Elecraft mailing list archive at Nabble.com. __ 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
Re: [Elecraft] KX3 roofing filters
At 03:30 PM 5/26/2011 -0700, you wrote: Jim Dunstan-2 wrote: My interpretation is that the narrow roofing filter option is variable with 500, 1500, 2700, and 3800 hz steps that follow the DSP filter as it's bandwidth is changed. These filters are ahead of the DSP at baseband. They protect the ADC from overload and should result in better Blocking Dynamic Range (BDR), which has been a weakness of most SDRs. 73, Bill Hi, Yes, that is what I understand. I didn't mean that the filter comes after the DSP ... it comes before the DSP filter ... but it's bandwidth is adjusted according to the DSP bandwidth as the DSP bandwidth is changed the roofing filter will follow. The filter is at a vy low frequency prior to the ADC ... I am wondering what kind of filter it is as it certainly can't be a xtal filter at this vy low frequency has to be some kind of software controlled filter. Jim, VE3CI __ 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] KX3 roofing filters
I am wondering what kind of filter it is as it certainly can't be a xtal filter at this vy low frequency has to be some kind of software controlled filter. I think that I heard Wayne say at the Elecraft display in Dayton that they were mechanical filters. Mike / KK5F __ 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
