K3. S/No:4250
Locked
 
|
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.
|
|
|
Eric,
The woosh you describe happens here when I use filters with different IF offsets. I trust that you use filters with the same offset. Maybe one of the offsets has changed? You can check this easily with the K3 utilty program. Look at the configuration tab onder 'configure crystal filters'. If you use the diversity setting and you still hear the woosh, this is the thing I would check. 73 Arie PA3A Op 2-1-2012 7:17, Eric Buggee; VK3AX schreef: > 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! > > 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 |
|
|
I agree with Arie's comments below. Even if your filters were not factory matched for identical offsets, you can simply set both to the average...e.g. for -0.75 and -0.81 set both to -0.78. You would never notice a 30 Hz difference in the total 2700 Hz BW of stock 5-pole filters.
73, Bill < author="Arie Kleingeld PA3A-2"> Eric, The woosh you describe happens here when I use filters with different IF offsets. I trust that you use filters with the same offset. Maybe one of the offsets has changed? You can check this easily with the K3 utilty program. Look at the configuration tab onder 'configure crystal filters'. If you use the diversity setting and you still hear the woosh, this is the thing I would check. 73 Arie PA3A Op 2-1-2012 7:17, Eric Buggee; VK3AX schreef: > 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! > > ______________________________________________________________ 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 |
«
Return to [K3]
|
1 view|%1 views
| Free forum by Nabble | Edit this page |