Re: [Elecraft] Question about KNB2 Noise Blanker (Gain reduction in NB2 posit...
I've had the opposite luck. My K2 takes out local electrical noise and ignition noise where my TS-570S and IC-746 noise blankers didn't do a thing. I've been very happy with the noise blanker in my K2 and think that's been the best option for the buck! ___ 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] Question about KNB2 Noise Blanker (Gain reduction in NB2 posit...
Stewart wrote: >No loss of signal when switching in my NB, but it is very selective >on what type of noise it blanks. The very simple noise blankers of the K1 and K2 seem to help only on ignition, motor commutator, and other such similar noise. These blankers seem completely ineffective on all of the various types of power line noise I've encountered, unlike the more sophisticated blankers in most other rigs produced in the past 25 years. The blankers in my ancient 22-year-old TS-430 and 11-year-old TS-50 work wonders in comparison. Maybe it's time for a re-design of the Elecraft blanker system. 73, Mike / KK5F ___ 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] Question about KNB2 Noise Blanker (Gain reduction in NB2 posit...
[EMAIL PROTECTED] wrote: Hi Ken, This effect of gain reduction when NB2 is selected does not happen on my K2. Hi Chaps. Thanks to all for the replies. I have fixed the problem now. It was the 2N7000 FET (Q6) on the KNB2 board. I used an anti-static wrist strap and mat during construction so thought ESD protection was OK. Maybe faulty from the start. Maybe me. Who knows? Anyway, working correctly on both NB1 and NB2 now with no reduction of gain. Just need to find another 2N7000 for my XV60 board. Thanks again and Happy New Year. Ken. -- Ken G3WCS <[EMAIL PROTECTED]> IO83rh : Cheshire : NW England (+44) (0)870 765 1632 (home) (+44) (0)7733 400 950 (mobile & sms) ___ 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] Question about KNB2 Noise Blanker (Gain reduction in NB2 posit...
On Thu, 30 Dec 2004 05:46:52 EST, [EMAIL PROTECTED] wrote: > Hi Ken, > > This effect of gain reduction when NB2 is selected does not happen on my K2. > > A question is are you receiving large doses of noise that the blanker is > removing as the operation of a noise blankers is to cut out the affected > section? > If the noise is severe enough this can result in distortion and reduction of > signal. > > You can check this by disconnecting the antenna and observing a signal from > an RF generator under the same test. > > Took quite a time before I could even say my NB was even working. Only works > with the right kind of noise such as ignition interference. Shades of > British Rail and their problems with the wrong kind of leaves on the railway > lines! > > Regards, > Bob, G3VVT > K2 #4168 > ___ > 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 Hi Ken, No loss of signal when switching in my NB, but it is very selective on what type of noise it blanks. 73 Stewart G3RXQ ___ 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] Question about KNB2 Noise Blanker (Gain reduction in NB2 posit...
Hi Ken, This effect of gain reduction when NB2 is selected does not happen on my K2. A question is are you receiving large doses of noise that the blanker is removing as the operation of a noise blankers is to cut out the affected section? If the noise is severe enough this can result in distortion and reduction of signal. You can check this by disconnecting the antenna and observing a signal from an RF generator under the same test. Took quite a time before I could even say my NB was even working. Only works with the right kind of noise such as ignition interference. Shades of British Rail and their problems with the wrong kind of leaves on the railway lines! Regards, Bob, G3VVT K2 #4168 ___ 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
