Re: [Elecraft] K3 : AM synchronous detection
Roger, Ron. I just hadn't seen any information that would indicate how wide the DSP filters would go if one had a roofing filter wider than 6 KHz. I've used only one sideband when there was interference on one side of the other of an AM signal, but always used the 746Pro's synchronous AM when possible. That's one thing it did well. So I'm hoping that the firmware will develop to allow better than 3 KHz real AM if one has the roof for it. And surely it will, the way the guys are going. Better and better every week. By the time my K3 arrives there'll be nothing left to whine about. On Jan 12, 2008 1:18 PM, Ron D'Eau Claire <[EMAIL PROTECTED]> wrote: > Hello Dave: > > The errata with the list of features is the one you should have received > with the Owner's manual. The current one on the Elecraft web site is C1-1 > dated Nov 18. > > http://www.elecraft.com/manual/K3%20owner's%20man%20errata%20C1-1.pdf > > It sounds like you were looking at the errata sheet for the Kit assembly > manual. > > I have a 6 kHz filter as well, and for best audio fidelity I use a SSB mode > to listen to broadcast AM. The excellent stability and high tuning accuracy > of the K3 means I just punch in the frequency I want and even music is > within one or two Hz of the right frequency - much too close for me to hear > any tone error. > > As Lyle noted, the I.F. bandwidth of an AM signal is *twice* the audio > bandwidth since there are two sidebands that must fit through the 6 kHz > filter bandpass on an AM signal. I find that's FB on Ham AM signals, but > those commercial AM stations who make full use of their 5 kHz audio > bandwidth are cut off at about 3 kHz in AM mode. Gong to SSB mode with the 6 > KHz filter allows the full audio bandwidth through. > > Ron AC7AC > ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K3 : AM synchronous detection
Hello Dave: The errata with the list of features is the one you should have received with the Owner's manual. The current one on the Elecraft web site is C1-1 dated Nov 18. http://www.elecraft.com/manual/K3%20owner's%20man%20errata%20C1-1.pdf It sounds like you were looking at the errata sheet for the Kit assembly manual. I have a 6 kHz filter as well, and for best audio fidelity I use a SSB mode to listen to broadcast AM. The excellent stability and high tuning accuracy of the K3 means I just punch in the frequency I want and even music is within one or two Hz of the right frequency - much too close for me to hear any tone error. As Lyle noted, the I.F. bandwidth of an AM signal is *twice* the audio bandwidth since there are two sidebands that must fit through the 6 kHz filter bandpass on an AM signal. I find that's FB on Ham AM signals, but those commercial AM stations who make full use of their 5 kHz audio bandwidth are cut off at about 3 kHz in AM mode. Gong to SSB mode with the 6 KHz filter allows the full audio bandwidth through. Ron AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 : AM synchronous detection
...I'm wondering if we'll be able to have more bandwidth on AM when we use a 12 KHz or similar roofing filter. I expect this will be the case. 73, Lyle KK7P ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 : AM synchronous detection
> > > ...The bandwidth control only goes up to 3kHz on AM, but goes > > up to 6kHz on other modes. Is this normal... > > WIDTH refers to the fianl audio bandwidth. IF is 1:1 to the IF > bandwidth in CW, SSB and DATA modes. AM IF bandwidth is twice the audio > bandwidth. FM will have a fixed IF bandwidth, at least initially, and > WIDTH will refer to the AF response only. > When I had my 746Pro I really enjoyed the 9 KHz max bandwidth for AM broadcast when conditions allowed. I had a hi-fi speaker I could switch to. I'm wondering if we'll be able to have more bandwidth on AM when we use a 12 KHz or similar roofing filter. Dave W5DHM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 : AM synchronous detection
In a recent message, Lyle Johnson <[EMAIL PROTECTED]> wrote ... I wonder if there is a list available of the K3 features that are NOT yet activated in the current firmware. Check the errata sheet that came with the radio. As features are added, they'll be listed in the firmware updates, viewable through the K3 Utility. Many thanks, Lyle, but no mention of any missing features in the Errata sheet that I got with my kit. (Rev. C-3, November 26, 2007) ...I am unable to enable synchronous detection in AM mode. Not yet available. You can use USB or LSB and FINE tuning for the moment, as the K3 is very stable and most AM transmissions are as well. Thanks again. Yes, AM medium wave broadcast (even music) sounds good in USB/LSB modes. ...The bandwidth control only goes up to 3kHz on AM, but goes up to 6kHz on other modes. Is this normal... WIDTH refers to the fianl audio bandwidth. IF is 1:1 to the IF bandwidth in CW, SSB and DATA modes. AM IF bandwidth is twice the audio bandwidth. FM will have a fixed IF bandwidth, at least initially, and WIDTH will refer to the AF response only. Excellent - that confirms #00186 is working okay. 73 -- David G4DMP Leeds, England, UK -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 : AM synchronous detection
I wonder if there is a list available of the K3 features that are NOT yet activated in the current firmware. Check the errata sheet that came with the radio. As features are added, they'll be listed in the firmware updates, viewable through the K3 Utility. ...I am unable to enable synchronous detection in AM mode. Not yet available. You can use USB or LSB and FINE tuning for the moment, as the K3 is very stable and most AM transmissions are as well. ...The bandwidth control only goes up to 3kHz on AM, but goes up to 6kHz on other modes. Is this normal... WIDTH refers to the fianl audio bandwidth. IF is 1:1 to the IF bandwidth in CW, SSB and DATA modes. AM IF bandwidth is twice the audio bandwidth. FM will have a fixed IF bandwidth, at least initially, and WIDTH will refer to the AF response only. 73, Lyle KK7P ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
