K2: receiving noise without antenna on certain qrgs

[Rolf Schröder]

Dr OMs,
currently, I am experiencing noise on certain frequencies while
receiveing while no antenna is connected. To receive this noise, one has
to touch the key connector. This noise can be heard on e.g. 7010 khz. We
have experienced this noise with several K2 in our local ham club. Could
this be a bad ground connection of the key connector?

vy 73 de Rolf, DL8BAG, K2 806


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[Don Nesbitt]

Hello Rolf.  Yes, I have noticed the same thing (it appeared that I was
picking up noise generated by my nearby computer and that the noise was not
being internally generated in the K2) when touching the nut on key socket on
the rear of the  K2.  This nut should be "ground" but I discovered that it
was not - and - that the "sleeve" on the internal connector (key jack)
rotates within the housing (could be broken or something?).  I scraped off
some of the paint under the external nut in order to make sure that at least
the nut was making a good ground connection to the chassis.  That seems to
have "cured" the noise pick up.

Now I am hoping that it also "cured" a problem that I have noticed when I am
in the field using the internal battery - that being  that after a while,
the keyer will just start operating by itself sending a nice string of dits!
Only happens when the keyer paddle is plugged in - and - yes - I have
checked the connections on the paddle for possible shorts as well as
substituting another paddle with the same results.  As long as the cable was
not plugged in to the jack, the "self generation" did not occur.  I have not
had a chance to check out if grounding the nut has had any effect on this
"feature" yet - hi  73 es gl --don n4hh K2/100 #2028 etc, etc!


----- Original Message -----
From: <[hidden email]>
To: <[hidden email]>
Sent: Monday, July 12, 2004 9:24 AM
Subject: [Elecraft] K2: receiving noise without antenna on certain qrgs

> Dr OMs,
> currently, I am experiencing noise on certain frequencies while
> receiveing while no antenna is connected. To receive this noise, one has
> to touch the key connector. This noise can be heard on e.g. 7010 khz. We
> have experienced this noise with several K2 in our local ham club. Could
> this be a bad ground connection of the key connector?
>
> vy 73 de Rolf, DL8BAG, K2 806
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> 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
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[Tom Hammond-3]

Hi Rolf:

I have noticed a similar thing for the past several years.

I think what I'm receiving as 'noise' really might be either AM or FM
broadcast though... as it seems to have some small amount of modulation to it.

So far I have not been able to determine the cause OR the solution to the
problem... but it definitely IS there.

73,

Tom Hammond   N0SS


At 08:24 AM 7/12/04, [hidden email] wrote:

>Dr OMs,
>currently, I am experiencing noise on certain frequencies while
>receiveing while no antenna is connected. To receive this noise, one has
>to touch the key connector. This noise can be heard on e.g. 7010 khz. We
>have experienced this noise with several K2 in our local ham club. Could
>this be a bad ground connection of the key connector?
>
>vy 73 de Rolf, DL8BAG, K2 806
>
>
>_______________________________________________
>Elecraft mailing list
>Post to: [hidden email]
>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

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[Daniel Reynolds-2]

I have experienced intermod of local AM broadcasters as high up as 40m. I was
using a 100 ft long wire up about ten feet. It was setup one way (E-W), and it
wasn't noticeable, but when I turned it the other way (N-S), I believe that it
may have interacted more with the power lines several hundred feet away
(parallel with the lines). This is in an urban/suburban setting.

As a side note, I believe that the local power lines are carrying quite a bit
of the local AM signals based on experiences I've had listening to AM on the
car radio and being stopped at a light immediately under power lines. I'd be
tuned into one station, and another station(s) would bleed right over it.

So - your theory might be correct based on my experiences.

72/73
Daniel / AA0NI

--- Tom Hammond <[hidden email]> wrote:

> Hi Rolf:
>
> I have noticed a similar thing for the past several years.
>
> I think what I'm receiving as 'noise' really might be either AM or FM
> broadcast though... as it seems to have some small amount of modulation to
> it.
>
> So far I have not been able to determine the cause OR the solution to the
> problem... but it definitely IS there.
>
> 73,
>
> Tom Hammond   N0SS
>
>
> At 08:24 AM 7/12/04, [hidden email] wrote:
> >Dr OMs,
> >currently, I am experiencing noise on certain frequencies while
> >receiveing while no antenna is connected. To receive this noise, one has
> >to touch the key connector. This noise can be heard on e.g. 7010 khz. We
> >have experienced this noise with several K2 in our local ham club. Could
> >this be a bad ground connection of the key connector?
> >
> >vy 73 de Rolf, DL8BAG, K2 806
> >
> >
> >_______________________________________________
> >Elecraft mailing list
> >Post to: [hidden email]
> >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
>
> _______________________________________________
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>

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[Jim Brown-10]

On Mon, 12 Jul 2004 08:48:17 -0700 (PDT), Daniel Reynolds wrote:

>I have experienced intermod of local AM broadcasters as high up as
40m.

Several months ago I bought and installed an ICE high pass filter (402X)
for the AM broadcast band (it cuts off at about 1.7 MHz). I noticed a drop of
a few dB in the overall BG noise level on 160. I didn't compare it on other
bands. Just to make sure it wasn't loss in the filter, I ran a response on the
filter with a calibrated generator and scope. It wasn't.

Jim Brown  K9YC


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