Hi Everyone,
A good friend of mine wrote the following to me, and I was hoping I might
get some comments from this list. He is working on incorporating an
Elecraft noise blanker into his old KWM-380.
I looked at the noise blankers for the Elecraft K1 and K2 and they seem to
be fine for my KWM-380. Since they are small boards, I will mount them on
a larger board as I must build a mixer circuit using double balanced
mixers from the Collins 39 MHz to the Elecraft if frequency of 4.014 MHz.
The K1 noise blanker uses discrete components, whereas the K2 uses an
integrated circuit for the same function. The KNB1 is $35, while the KNB2
is $39. In either case, I will not install the decoding and simply
hardwire the functions and have simply an on/off controlled by on board
relays.
The question is this: Which noise blanker was designed later? I would
assume that either the later designed unit used feedback from the earlier
unit. If that is the KNB1, it may be that they found they could save a
few components and still have the same blanker.
Which brings up the second question, has there been any feedback about
whether one or the other blanker works better?
I am getting things really working well on the KWM-380. With a lot of
work, it should be almost as good as the Ten Tec Paragon II (which is
worth about 1/3 as much). There is a KWM-380 on eBay right now that is
owned by Ronnie Milsap. Price is $3550, but the reserve has not been met.
I'd appreciate any input I could get to help my friend.
- Phil, WA7URV
K1 #220
K2 #2690
KX1 #218
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