Brett wrote: >I have a noise at my place that comes on at night and is a random >pulse type noise... > >In my Kenwood TS-450S both NB1 and NB2 seem to have about the same >effect on the noise and it does a pretty good job. > >But the K1 seems to be completely ineffectual on this noise. Could >it be that it's a construction issue?
It's not a construction issue. The K1 noise blanker is very very limited in the types of noise that it will have any effectiveness reducing. My K1's NB is completely ineffective on my local power line noise, but it will reduce noise such as that generated by a sparking DC motor brush and commutator. My Kenwood TS-50S noise blanker almost completely eliminates nearby high power line noise, although its NB reduces the TS-50S receiver's modest dynamic range (which almost all NBs do). For what it's worth, when the K1 NB is set to HIGH, it sets a HIGH threshold for a noise pulse to trigger blanking. LOW setting sets a LOW threshold, so the NB is more likely to have an effect when LOW is used rather than HIGH. If you used the option of installing an LED as one of the threshold diodes, that sets an even higher noise theshold than the normal diode does when the NB is set to HIGH, and the KNB1 will be even less likely to produce a blanking effect. Another oddity about the K1 NB is that the K1 quick reference guide on the Elecraft site and in the K1 manual incorrectly indicate that the K1 NB menu settings are NB1 and NB2, rather than the correct HIGH and LOW. This was pointed out seven years ago. 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
