Bad crystal filter ?
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Working with my newly constructed K3S today, I noticed that receiving through the FL4 crystal filter (400 hz, 8-pole) was noticeably suppressed. Through the FL3 (1.8 kHz) filter, an RTTY signal would be nice and strong with good S-meter indications. Going to 400 Hz the signal would nearly be lost and I could not decode it. Going to FL5 (250 Hz), the S-meter would pick up again with strong signals.
There's not much to check on the Config menu except the FL4 GN and it's at max (8 db) - not much change. Is there something else I should do to deal with this ? 73, Jamie WB4YDL Sent from my iPad ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Jamie, What is the offset (FL# FRQ)? What is the PITCH in the K3S vs. MARK in your RTTY software? 73, ... Joe, W4TV On 9/18/2015 3:30 PM, James C. Hall, MD wrote: > Working with my newly constructed K3S today, I noticed that receiving through the FL4 crystal filter (400 hz, 8-pole) was noticeably suppressed. Through the FL3 (1.8 kHz) filter, an RTTY signal would be nice and strong with good S-meter indications. Going to 400 Hz the signal would nearly be lost and I could not decode it. Going to FL5 (250 Hz), the S-meter would pick up again with strong signals. > > There's not much to check on the Config menu except the FL4 GN and it's at max (8 db) - not much change. > > Is there something else I should do to deal with this ? > > 73, Jamie > WB4YDL > > Sent from my iPad > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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There's a process in the owners manual for adjusting dB loss compensation for the roofing filters. You can see it with the k3 utility
On September 18, 2015 4:57:39 PM EDT, "Joe Subich, W4TV" <[hidden email]> wrote: > >Jamie, > >What is the offset (FL# FRQ)? > >What is the PITCH in the K3S vs. MARK in your RTTY software? > >73, > > ... Joe, W4TV > > >On 9/18/2015 3:30 PM, James C. Hall, MD wrote: >> Working with my newly constructed K3S today, I noticed that receiving >through the FL4 crystal filter (400 hz, 8-pole) was noticeably >suppressed. Through the FL3 (1.8 kHz) filter, an RTTY signal would be >nice and strong with good S-meter indications. Going to 400 Hz the >signal would nearly be lost and I could not decode it. Going to FL5 >(250 Hz), the S-meter would pick up again with strong signals. >> >> There's not much to check on the Config menu except the FL4 GN and >it's at max (8 db) - not much change. >> >> Is there something else I should do to deal with this ? >> >> 73, Jamie >> WB4YDL >> >> Sent from my iPad >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] >> >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:[hidden email] > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html >Message delivered to [hidden email] -- Sent from my Android device with K-9 Mail. Please excuse my brevity. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by James Hall-2
Jamie,
Is there any chance that you have installed the 400Hz filter backwards. Several have reported similar results from that problem. 73, Don W3FPR On 9/18/2015 3:30 PM, James C. Hall, MD wrote: > Working with my newly constructed K3S today, I noticed that receiving through the FL4 crystal filter (400 hz, 8-pole) was noticeably suppressed. Through the FL3 (1.8 kHz) filter, an RTTY signal would be nice and strong with good S-meter indications. Going to 400 Hz the signal would nearly be lost and I could not decode it. Going to FL5 (250 Hz), the S-meter would pick up again with strong signals. > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by James Hall-2
In response to W4TV Joe's question:
The frequency offset for the 8-pole crystal filter is 0.00 Hz. The Pitch is 650 Hz on the K3S. And the Mark for RTTY is the standard 2125 Hz. I've got a new 400 Hz filter on its way so I'll see what the problem is. I just hope it's not an RF board. I took ESD precautions very seriously while building it so, fingers crossed. 73, Jamie WB4YDL Sent from my iPad > On Sep 18, 2015, at 2:30 PM, James C. Hall, MD <[hidden email]> wrote: > > Working with my newly constructed K3S today, I noticed that receiving through the FL4 crystal filter (400 hz, 8-pole) was noticeably suppressed. Through the FL3 (1.8 kHz) filter, an RTTY signal would be nice and strong with good S-meter indications. Going to 400 Hz the signal would nearly be lost and I could not decode it. Going to FL5 (250 Hz), the S-meter would pick up again with strong signals. > > There's not much to check on the Config menu except the FL4 GN and it's at max (8 db) - not much change. > > Is there something else I should do to deal with this ? > > 73, Jamie > WB4YDL > > Sent from my iPad Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by James Hall-2
Hi Jamie,
I was just looking at the crystal filter configuration menu in the K3 Utility program and I noticed that there are check boxes for enabling the filters for DATA mode. I don't know if this is for transmit and receive or just transmit. On my K3 I have this box checked for all of my filters. I also have all of them checked for CW. 73, Mike K2MK
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In reply to this post by James Hall-2
> The Pitch is 650 Hz on the K3S. And the Mark for RTTY is the > standard2125 Hz. PITCH should be set to the same as MARK in RTTY. 73, ... Joe, W4TV On 9/19/2015 12:49 AM, James C. Hall, MD wrote: > In response to W4TV Joe's question: > > The frequency offset for the 8-pole crystal filter is 0.00 Hz. > > The Pitch is 650 Hz on the K3S. And the Mark for RTTY is the standard 2125 Hz. > > I've got a new 400 Hz filter on its way so I'll see what the problem is. I just hope it's not an RF board. I took ESD precautions very seriously while building it so, fingers crossed. > > 73, Jamie > WB4YDL > > Sent from my iPad > >> On Sep 18, 2015, at 2:30 PM, James C. Hall, MD <[hidden email]> wrote: >> >> Working with my newly constructed K3S today, I noticed that receiving through the FL4 crystal filter (400 hz, 8-pole) was noticeably suppressed. Through the FL3 (1.8 kHz) filter, an RTTY signal would be nice and strong with good S-meter indications. Going to 400 Hz the signal would nearly be lost and I could not decode it. Going to FL5 (250 Hz), the S-meter would pick up again with strong signals. >> >> There's not much to check on the Config menu except the FL4 GN and it's at max (8 db) - not much change. >> >> Is there something else I should do to deal with this ? >> >> 73, Jamie >> WB4YDL >> >> Sent from my iPad > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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