Re: [Elecraft] KX1 Freq & Filter Offset?
Eric Ward" <[EMAIL PROTECTED]> wrote >Using the narrowest filter setting to battle qrm in FD confirms that I have >the best copy on signals when they give me a recovered audio tone of about >470 hz - and - when I tune them in for that peak, I am (of course) off their >frequency since the KX1 seems to have a "fixed" offset of about 600 +/- hz. Eric : I can't comment as to whether the offset is fixed as I am using a side tone pitch of 600HZ. However, I have verified that the center of the audio filter shifts to somewhere around 500hz when cranked down to its lowest setting (I piped the KX1 audio into my computer running Spectogram). I see the same sort of behavior on my Ten-Tec Scout, which has a similar type of filter (Jones) so I am not sure if this is a artifact of the design / implementation of this sort of filter. The trick I use to tune signals is to peak the signal with the filter at about the 500hz setting ... this gives me a filter center of around 600hz. If I need to crank the filter down to 300hz I then engage the RIT if it is a particularly weak signal. I also notice some signal attenuation as the filter is tightened but I believe that this is normal. Michael VE3WMB ___ 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/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KX1 Freq & Filter Offset?
Yes. The xmit offset is fixed at 600 Hz on the KX1. Ron AC7AC -Original Message- ...is it true that the offset is fixed at 600Hz? I was under the (mistaken?) impression that the offset changed when the sidetone pitch is changed--i.e. if you set sidetone pitch to 500Hz, then you still zero beat to your sidetone frequency to determine the received station's carrier freq (as is described on p.66 of the manual). Is that wrong? Does zero beating to match the sidetone pitch only work at 600Hz? Thanks! 73, Eric N0HHS ___ 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/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KX1 Freq & Filter Offset?
KX1 gurus: is it true that the offset is fixed at 600Hz? I was under the (mistaken?) impression that the offset changed when the sidetone pitch is changed--i.e. if you set sidetone pitch to 500Hz, then you still zero beat to your sidetone frequency to determine the received station's carrier freq (as is described on p.66 of the manual). Is that wrong? Does zero beating to match the sidetone pitch only work at 600Hz? Thanks! 73, Eric N0HHS Using the narrowest filter setting to battle qrm in FD confirms that I have the best copy on signals when they give me a recovered audio tone of about 470 hz - and - when I tune them in for that peak, I am (of course) off their frequency since the KX1 seems to have a "fixed" offset of about 600 +/- hz. __ ___ 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/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KX1 Freq & Filter Offset?
Try using the RIT function to change the RX freq so you get 470 Hz. I read on this list that the filter response shifts below 500Hz - have you checked the peak at the 500Hz width? It would be nice to know when it shifts down. Leigh WA6ZNU On Sun, 27 Jun 2004 12:17pm, Donald Nesbitt wrote: Using the narrowest filter setting to battle qrm in FD confirms that I have the best copy on signals when they give me a recovered audio tone of about 470 hz - and - when I tune them in for that peak, I am (of course) off their frequency since the KX1 seems to have a "fixed" offset of about 600 +/- hz. At QRO it's no big deal but running about 1/2 watt output (weak batteries!) I am having great fun but sure would like to be able to zero-beat them and still receive them on my peak. So - is there any way to "slide" the filter response up and down in the KX1 as can be done with the K2? I've confirmed the narrow filter peak at about 470 hz using a broadband noise source and Spectrogram and can't see any way to "move" the filter response to where I need it to be. The way I read the bfo and dds circuits it may end up to be a capacitor substitution as opposed to a software fix. Surely I'm missing something simple.Any ideas? 73 es have fun --don n4hh ___ 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/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com 73, WA5ZNU Leigh ___ 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/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KX1 Freq & Filter Offset?
Using the narrowest filter setting to battle qrm in FD confirms that I have the best copy on signals when they give me a recovered audio tone of about 470 hz - and - when I tune them in for that peak, I am (of course) off their frequency since the KX1 seems to have a "fixed" offset of about 600 +/- hz. At QRO it's no big deal but running about 1/2 watt output (weak batteries!) I am having great fun but sure would like to be able to zero-beat them and still receive them on my peak. So - is there any way to "slide" the filter response up and down in the KX1 as can be done with the K2? I've confirmed the narrow filter peak at about 470 hz using a broadband noise source and Spectrogram and can't see any way to "move" the filter response to where I need it to be. The way I read the bfo and dds circuits it may end up to be a capacitor substitution as opposed to a software fix. Surely I'm missing something simple.Any ideas? 73 es have fun --don n4hh ___ 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/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
