K3. S/No:4250
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Hi all, I have had my K3 since mid August 2010. Bought it as a kit fully optioned with 2nd Rx,&gen coverage BPFand a set of 8 pole filters for main & 2nd Rx.
Since I have had it in use (mainly 160M) it has performed almost flawlessly; with one exception!
When I engage the SUB Rx on our early morning net freq of 1859KHz I get a soft repetitive whoosh -whoosh sound form the stereo speakers, almost as if there were a slow BEAT between the frequency of the two receivers, this is audible even if there is no signal on frequency or not. This phenomenon is NOT as pronounced if the two Rx are tuned to a frequency ending in a round number (say 1860KHz) but is still there and JUST tolerable!
I do have the High stability TCXO option installed. and, have re-calibrated the main synthesiser a couple of times in the past year, each time with some improvement but the problem is still there and over time
(4 to 6 weeks) becomes annoying again. I suspect that there is a slow drift of or in the calibration of the main & 2nd sythesizers but cannot be 100% certain that this is a fact!
I would deeply appreciate any POSITIVE comment advice or assistance in regard to this matter, as, I am becoming frustrated by this slow deterioration in the performance of what is otherwise a very fine radio.
P.S.
Does anyone in the forum have any knowledge of using an Alinco EDX-2 external ATU with a K3?
for example any wiring changes to accomodate band data exchange & keying & tune signals / data?
Thanking all in advance & HNY to all.
Eric Buggee,
VK3AX.
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Try TAPping the FINE button to show as many numerals as you can, on both the
main and sub receiver (use the A/B to switch back and forth). Then make sure that they BOTH have EXACTLY, to the last numeral, the same value. That should take care of the problem. Rick WA6NHC -----Original Message----- From: Eric Buggee; VK3AX When I engage the SUB Rx on our early morning net freq of 1859KHz I get a soft repetitive whoosh -whoosh sound form the stereo speakers, almost as if there were a slow BEAT between the frequency of the two receivers, this is audible even if there is no signal on frequency or not. This phenomenon is NOT as pronounced if the two Rx are tuned to a frequency ending in a round number (say 1860KHz) but is still there and JUST tolerable! ______________________________________________________________ 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 |
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Hi Rick.
Thank you for your reply. I guess I should have mentioned that! I have done all of that, that is I have already equalised the readout frequencies on both displays (main & Sub). I have also incremented either one -or-the other displays (main & Sub) by + or - a least significant digit on both displays in fine mode. The whoosh-whoosh is at its slowest when both deaout displays (main & sub) are numerically identical! Apologies for not stating that in my original posting, but, I did not wish to be seen as being too wordy! Yes already tried all of that and as I said when I cal the TCXO carefully after about a one hour warm-up (stabilisation period, the whoosh-whoosh is at its slowest and gradually drifts out to being faster until after a period of about 4 to 6 weeks it becomes annoying. It goes from one in approx 10 seconds to about 0.5 second period; believe me it is Damn annoying! Hence the reason for this posting. I have been a Ham for over 50 years and have built my own gear (both valve & solid state. Currently finishing the (slow) assembly of a PicaStar rig which I started about 3 years back. Thanks Rick and any others out there in K3 land I will appreciate your comments! Sincerely, Eric, VK3AX. On 1/2/2012 5:36 PM, Rick Bates [via Elecraft] wrote: Try TAPping the FINE button to show as many numerals as you can, on both theWhen I engage the SUB Rx on our early morning net freq of 1859KHz I get a soft repetitive whoosh -whoosh sound form the stereo speakers, almost as if |
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Are you using two antennas and the sub is on the other? Diversity reception can sound like that.
Rick wa6nhc Tiny iPhone keypad, sorry for typos On Jan 2, 2012, at 2:57 AM, "Eric Buggee; VK3AX" <[hidden email]> wrote: > Hi Rick. > Thank you for your reply. I guess I should have > mentioned that! I have done all of that, that is I have already > equalised the readout frequencies on both displays (main & Sub). I have > also incremented either one -or-the other displays (main & Sub) by + or > - a least significant digit on both displays in fine mode. The > whoosh-whoosh is at its slowest when both deaout displays (main & sub) > are numerically identical! > Apologies for not stating that in my original posting, but, I did not > wish to be seen as being too wordy! > Yes already tried all of that and as I said when I cal the TCXO > carefully after about a one hour warm-up (stabilisation period, the > whoosh-whoosh is at its slowest and gradually drifts out to being faster > until after a period of about 4 to 6 weeks it becomes annoying. It goes > from one in approx 10 seconds to about 0.5 second period; believe me it > is Damn annoying! > > Hence the reason for this posting. I have been a Ham for over 50 years > and have built my own gear (both valve & solid state. Currently > finishing the (slow) assembly of a PicaStar rig which I started about 3 > years back. > > Thanks Rick and any others out there in K3 land I will appreciate your > comments! > > Sincerely, > > Eric, > > VK3AX. > > > On 1/2/2012 5:36 PM, Rick Bates [via Elecraft] wrote: >> Try TAPping the FINE button to show as many numerals as you can, on >> both the >> main and sub receiver (use the A/B to switch back and forth). Then make >> sure that they BOTH have EXACTLY, to the last numeral, the same value. >> >> That should take care of the problem. >> >> Rick WA6NHC >> >> -----Original Message----- >> From: Eric Buggee; VK3AX >> > When I engage the SUB Rx on our early morning net freq of 1859KHz I > get a >> soft repetitive whoosh -whoosh sound form the stereo speakers, almost >> as if >> there were a slow BEAT between the frequency of the two receivers, >> this is >> audible even if there is no signal on frequency or not. This >> phenomenon is >> NOT as pronounced if the two Rx are tuned to a frequency ending in a >> round >> number (say 1860KHz) but is still there and JUST tolerable! >> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> </user/SendEmail.jtp?type=node&node=7143197&i=0> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> >> ------------------------------------------------------------------------ >> If you reply to this email, your message will be added to the >> discussion below: >> http://elecraft.365791.n2.nabble.com/K3-S-No-4250-tp7143174p7143197.html >> To unsubscribe from K3. S/No:4250, click here >> < >> NAML >> <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.InstantMailNamespace&breadcrumbs=instant+emails%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> >> > > > > -- > View this message in context: http://elecraft.365791.n2.nabble.com/K3-S-No-4250-tp7143174p7143506.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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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This post was updated on .
In reply to this post by Eric Buggee; VK3AX
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Brgds,
Dave, N3HE Cincinnati OH |
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I'm obviously not smoking the same stuff.
Regards, Mike VP8NO On 03/01/2012 13:39, David Windisch wrote: > First whack at at it: > > Assumptions: signal: 1.860 MHz; local osc: 1.860 + 8.215 = 10.075 MHz > > In 6 weeks, there are about 36.56016E12 local oscillator cycles, for the > top-band frequency given. > > Each cycle takes the reciprocal of 36.56016E12 in time. > > Think of the local osc signal as a Slinky on its side with 36.56016E12 turns > spread exactly evenly over 6 weeks. > > I'm thinking that expecting the first and all subsequent cycles not to > wander a bit in time-position over a 6-week term is not justifiable. > > Does that make sense? > > Brgds, > Dave, N3HE > Maths done on windoze accessory calculator 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 |
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In reply to this post by David Windisch
Hi David
I agree you are quite correct; what is concerning me is that if Both Rx synthesisers are controlled by the TCXO why am I seeing this shift? I will be the first to acknowledge that I have done -or- am doing something wrong in the operation / use of my rig; at the moment, i tend to think it is a problem with one of the Rx synthesisers. (BTW the whoosh is worse when I have the RX set on to an odd number Least Significant Digit, eg 9 or 7 etc as opposed to a rounded number, eg "0") I will carefully go through the Sub Rx set-up procedure again & see if this fixes the problem. Thank you & all others for your constructive input. Eric, VK3AX. On 1/4/2012 3:39 AM, David Windisch [via Elecraft] wrote: First whack at at it: |
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