Re: [Elecraft] K3: Why can't I use my 1.8kHz filter for SSB TX?
One possibility is that the rig has only been type approval tested in that configuration, so anyone wanting to operate it with a different filter would require a professional RF spectrum analyzer. Top posted through policy, not belief. Brian Machesney wrote: reflector. The only authoritative information I found information was this from July 2008: Until further information to the contrary is available from Elecraft, you must select the 2.7 or 2.8 filter for SSB, Data and CW transmit. The AM transmit filter must be 6 kHz and the FM transmit filter must be 13 kHz. Any other settings will result in failure and a ERR TXF (Error TX Filter) message. -- David Woolley we do not overly restrict the subject matter on the list, and we encourage postings on a wide range of amateur radio related topics List Guidelines http://www.elecraft.com/elecraft_list_guidelines.htm __ 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] K3: Why can't I use my 1.8kHz filter for SSB TX?
Early versions of the firmware did, in fact, allow transmission through the 2.1kHz filter, and that capability was removed. I suggest that speculation is futile, since there are authoritative sources available. 73, doug Date: Tue, 26 Jan 2010 08:41:18 + From: David Woolley (E.L) for...@david-woolley.me.uk One possibility is that the rig has only been type approval tested in that configuration, so anyone wanting to operate it with a different filter would require a professional RF spectrum analyzer. Top posted through policy, not belief. Brian Machesney wrote: reflector. The only authoritative information I found information was this from July 2008: Until further information to the contrary is available from Elecraft, you must select the 2.7 or 2.8 filter for SSB, Data and CW transmit. The AM transmit filter must be 6 kHz and the FM transmit filter must be 13 kHz. Any other settings will result in failure and a ERR TXF (Error TX Filter) message. __ 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] K3: Why can't I use my 1.8kHz filter for SSB TX?
Yes but those sources doesn´t speak. / Jim On 2010-01-26 17:16, Doug Faunt N6TQS +1-510-655-8604 wrote: Early versions of the firmware did, in fact, allow transmission through the 2.1kHz filter, and that capability was removed. I suggest that speculation is futile, since there are authoritative sources available. 73, doug Date: Tue, 26 Jan 2010 08:41:18 + From: David Woolley (E.L)for...@david-woolley.me.uk One possibility is that the rig has only been type approval tested in that configuration, so anyone wanting to operate it with a different filter would require a professional RF spectrum analyzer. Top posted through policy, not belief. Brian Machesney wrote: reflector. The only authoritative information I found information was this from July 2008: Until further information to the contrary is available from Elecraft, you must select the 2.7 or 2.8 filter for SSB, Data and CW transmit. The AM transmit filter must be 6 kHz and the FM transmit filter must be 13 kHz. Any other settings will result in failure and a ERR TXF (Error TX Filter) message. __ 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] K3: Why can't I use my 1.8kHz filter for SSB TX?
I would like to use the 2.1 kHz filter for SSB TX. Elecraft any solution? Jim SM2EKM On 2010-01-24 19:38, Brian Machesney wrote: Yes, I did search the archives to find out why you can transmit through some filters and not through others before posting this question to the reflector. The only authoritative information I found information was this from July 2008: Until further information to the contrary is available from Elecraft, you must select the 2.7 or 2.8 filter for SSB, Data and CW transmit. The AM transmit filter must be 6 kHz and the FM transmit filter must be 13 kHz. Any other settings will result in failure and a ERR TXF (Error TX Filter) message. See the Errata sheet that shipped with your K3. 73, Don W3FPR To the best of my ability to discern, this does not indicate the reason for the limitation. In fact, the phrase until further information and the fact that ESSB uses a different filter than traditional SSB indicates to me at least the possibility that there may be firmware reasons for this limitation (like BFO alignment on TX and RX), not that there aren't also possibly hardware reasons (like carrier rejection, etc.). If someone knows the theory of the radio's operation well enough to help me understand the limitation, I would like to be enlightened. So yes, I did look for the answer in the reflector archives and no, this is not a request for Elecraft to take valuable time out from their other activities to react to my personal wish list. __ 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] K3: Why can't I use my 1.8kHz filter for SSB TX?
What would be the problem you were solving? On Mon, Jan 25, 2010 at 1:44 AM, Jan Erik Holm sm2...@telia.com wrote: I would like to use the 2.1 kHz filter for SSB TX. Elecraft any solution? Jim SM2EKM __ 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] K3: Why can't I use my 1.8kHz filter for SSB TX?
The key problem is that when you want to use other than a 2.7 or 2.8 kHz filter for receive, you must still tie up one of the remaining 4 filter slots with either the 2.7 or 2.8 kHz filters in order to transmit. If there were 7 or 8 filter slots in the radio, or one slot dedicated to transmit, this would not be a problem. In my case, I have a 200, 500, 1000, 2.1 and 6 Khz filter installed. I don't want to give up any of them, but because of this limitation, I have to remove one of the filters I want to use. 73, Bob W5OV -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Guy Olinger K2AV Sent: Monday, January 25, 2010 7:05 AM To: Jan Erik Holm Cc: Elecraft Subject: Re: [Elecraft] K3: Why can't I use my 1.8kHz filter for SSB TX? What would be the problem you were solving? On Mon, Jan 25, 2010 at 1:44 AM, Jan Erik Holm sm2...@telia.com wrote: I would like to use the 2.1 kHz filter for SSB TX. Elecraft any solution? Jim SM2EKM __ 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] K3: Why can't I use my 1.8kHz filter for SSB TX?
I see where you are coming from, but with a 2.1 why bother with the 1000 roofing filter (that's a question, not a criticism), since for casual operation the DSP should suffice. But since you DON'T have a 2.7/2.8 installed, how are you tricking the system? You telling it that the 2.1 is a 2.7? Why do you have to remove one of the filters I want to use? In my lineup I have 250, 400, 1.8, 2.7, and 6. For casual CW I frequently use width at 800 (thus invoking the 1.8 roofer) around 500 Hz. For digital I use 2.7 width and let the computer watch the entire bandwidth. Some time ago I asked why one did not transmit CW through the narrow filter to limit bandwidth. I never quite got that answered. Some speculated that had to do with products of phase distortion in the narrow filters. I don't recollect an official answer. My personal *guess* at this point is that it has something to do with FCC type acceptance. 73, Guy. On Mon, Jan 25, 2010 at 8:29 AM, Bob Naumann w...@w5ov.com wrote: The key problem is that when you want to use other than a 2.7 or 2.8 kHz filter for receive, you must still tie up one of the remaining 4 filter slots with either the 2.7 or 2.8 kHz filters in order to transmit. If there were 7 or 8 filter slots in the radio, or one slot dedicated to transmit, this would not be a problem. In my case, I have a 200, 500, 1000, 2.1 and 6 Khz filter installed. I don't want to give up any of them, but because of this limitation, I have to remove one of the filters I want to use. 73, Bob W5OV -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Guy Olinger K2AV Sent: Monday, January 25, 2010 7:05 AM To: Jan Erik Holm Cc: Elecraft Subject: Re: [Elecraft] K3: Why can't I use my 1.8kHz filter for SSB TX? What would be the problem you were solving? On Mon, Jan 25, 2010 at 1:44 AM, Jan Erik Holm sm2...@telia.com wrote: I would like to use the 2.1 kHz filter for SSB TX. Elecraft any solution? Jim SM2EKM __ 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] K3: Why can't I use my 1.8kHz filter for SSB TX?
Yes, I did search the archives to find out why you can transmit through some filters and not through others before posting this question to the reflector. The only authoritative information I found information was this from July 2008: Until further information to the contrary is available from Elecraft, you must select the 2.7 or 2.8 filter for SSB, Data and CW transmit. The AM transmit filter must be 6 kHz and the FM transmit filter must be 13 kHz. Any other settings will result in failure and a ERR TXF (Error TX Filter) message. See the Errata sheet that shipped with your K3. 73, Don W3FPR To the best of my ability to discern, this does not indicate the reason for the limitation. In fact, the phrase until further information and the fact that ESSB uses a different filter than traditional SSB indicates to me at least the possibility that there may be firmware reasons for this limitation (like BFO alignment on TX and RX), not that there aren't also possibly hardware reasons (like carrier rejection, etc.). If someone knows the theory of the radio's operation well enough to help me understand the limitation, I would like to be enlightened. So yes, I did look for the answer in the reflector archives and no, this is not a request for Elecraft to take valuable time out from their other activities to react to my personal wish list. -- 73 -- Brian -- K1LI On Sun, Jan 24, 2010 at 1:19 PM, Jim Brown j...@audiosystemsgroup.comwrote: On Sun, 24 Jan 2010 10:01:05 +, rfenab...@gmail.com wrote: Have you searched the reflector or the website for past communications on the topics that interest you? There are engineering reasons why you can transmit through some filters and not others. These are not firmware issues, they are RF design issues. Elecraft has very good engineers, and they tend to make good decisions. Jim Brown K9YC __ 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] K3: Why can't I use my 1.8kHz filter for SSB TX?
Hi Brian I would also like to know the answer as well. Its a feature that works well on the Icom PRO radios. You can narrow the TX bandwidth and produce very penetrating audio without playing around all day with mic EQ settings. In fact most cheap mics can be made to sound pretty decent when transmitting through a narrow bandwidth filter. I am surprised that variable TX bandwidth is not a feature on the K3 yet. Another feature that works well is the Kenwood High Boost. This feature is found on the TS870S, TS850S and the TS480. This high boost can brighten most microphones without playing with a TX EQ all day. Its very effective on 75 meters on SSB for cutting through QRN. It certainly sounds better than the excessive bass and ESSB audio that people torture your ears with. ESSB station who call people in the DX window with the excessive bassy audio should be put up against the wall and shot for torturing other people. I have found the K3's DSP filter on 1.5KHZ bandwidth to be very effective. We just need people that use communications quality audio for this filter bandwidth. The Heil HC4 and HC5 are fantastic microphones for DX work on the K3. John --- On Sat, 1/23/10, Brian Machesney nekvts...@gmail.com wrote: From: Brian Machesney nekvts...@gmail.com Subject: [Elecraft] K3: Why can't I use my 1.8kHz filter for SSB TX? To: Elecraft Reflector elecraft@mailman.qth.net Date: Saturday, January 23, 2010, 7:59 PM I've searched the archives and found that use of a filter other than 2.7kHz for SSB TX seems to be forbidden. One selects a non-standard filter for ESSB; why can' t this filter be the 2.1kHz or 1.8kHz filter? -- 73 -- Brian -- K1LI __ 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
