K1 Noise Blanker

[Bill Cotter]

Phil,

There are electric fences on the farms that surround my QTH. The K1
noise blanker is a God-send for killing the steady pop-pop-pop
day-in, day-out. For the trivial price Elecraft asks, it was a
bargain for me.

73 Bill N4LG


At 09:21 PM 2/23/2012, you wrote:

>My summer project will likely be the K1 -- yet another fine
>Elecraft product to add to my QRP collection.  I hope to have a
>full 100 watts in QRP power someday.
>
>Question:  I am not sure about the noise blanker option on the
>K1.  I never use the NB on any other rig except for the Icom 706
>in my truck and there it does a good job.  I will not be using the
>K1 in the truck (or any vehicle) and I do not have a lot of spiky
>noise around here.
>
>So, is there any other reason why the NB on the K1 would be useful?
>
>73, phil, K7PEH
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[Mike Morrow-3]

Bill wrote:

> For the trivial price Elecraft asks, it was a bargain for me.

I agree.  The KNB1 is very modest in price.  When someday the K1 is
discontinued, it may not be available for back-fit to older units.

If you don't buy the KNB1, you won't have the connector that installs
on the K1 RF PCB.  In that case, you'd be wise to only tack in RF-C22
*away* from the holes for the KNB1 connector, so you don't risk damaging
any traces if later you get the KNB1 and then must remove C22 to install
the connector.

I have not often needed the KNB1 in the eleven years I've had the K1,
but when it has been needed (I operate portable a lot), it's been well
worth the price.  For a couple of years in my neighborhood, an odd
digital-like noise was continuous on 20m and 15m.  The KNB1 on HIGH
threshold made it vanish.  The more extreme LOW threshold is, as one
would expect, more troublesome from an IMD and dynamic blocking range
performance aspect, so I've never used the LOW threshold setting.

73,
Mike / KK5F
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