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K3: birdie on 3,721

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Alexandr Kobranov

K3: birdie on 3,721

Hello all,

before raising this question to support team I want ask for your
experience/opinion.
K3/10, 2.7 - 2.1 - 0.4 filters, latest fw

On 80m band I have strong (S5) birdie on 3,721MHz, LSB mode
(testing without ant)
But... when I switch BW from FL2 (2.7) to FL1 (2.1) it completely
dissapears. Like switched off...
Is it some issue of not so good screw fastening somewhere or is it
common "problem"?
Any other reports?
Thanks for any ideas...
73!
Lexa, ok1dst
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Alexandr Kobranov

Re: K3: birdie on 3,721

Correction and additional info:
I mean switching from FL2 to FL3 as 2.7 is FL1 and 2.1 as FL3

additionaly i found some birdie os 160m band but this was off if I
switched to higher filter
so with FL4, FL3 there is birdie but with FL2 there is nothing

strange....
what is going on?

L. -dst-
K3 #727

Alexandr Kobranov napsal(a):

> Hello all,
>
> before raising this question to support team I want ask for your
> experience/opinion.
> K3/10, 2.7 - 2.1 - 0.4 filters, latest fw
>
> On 80m band I have strong (S5) birdie on 3,721MHz, LSB mode
> (testing without ant)
> But... when I switch BW from FL2 (2.7) to FL1 (2.1) it completely
> dissapears. Like switched off...
> Is it some issue of not so good screw fastening somewhere or is it
> common "problem"?
> Any other reports?
> Thanks for any ideas...
> 73!
> Lexa, ok1dst
> _______________________________________________
> 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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Ken Wagner K3IU

Re: K3: birdie on 3,721

In reply to this post by Alexandr Kobranov

I recall a long time ago that Tom Hammond, N0SS, reported that he
originally had an unexpected birdie with his Field Test K3. I believe
that he stopped the birdie from signing by tightening up a screw on the
side panel... perhaps the one that secured the left side panel to the
internal shield.

I just found the email... URL below. Hope your solution is as quick as
Tom's was.

http://www.nabble.com/K3-Preliminary-Specifications-to14080072.html#a14080083

73,
Ken K3IU
K3 #202
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alexandr Kobranov wrote:

Tom Hammond-2

Re: K3: birdie on 3,721

Hi Ken and Alexandr:

Yes... BE SURE that all screws securing the front shield (to which the KSYN3 is
attached) is well grounded to the RF PC board, and to the sides and top cover
by ensuring that all screws are snug... but DO NOT tighten them to the point
that you risk damaging the screw heads!!!

This one step should eliminate virtually all birdies which might give problems
WHEN AN EXTERNAL ANTENNA IS CONNECTED. Of course, tuning around with
NO antenna
attached gives you a 'worst case' test... one which may not simulate
a 'real life'
case. I can find a few (weak) birdies when no antenna is connected,
but virtually
all of them disappear or are completely covered up by even minimal band noise
when a real antenna is connected.

73,

Tom Hammond N0SS

At 17:06 05/02/2008, Ken Wagner K3IU wrote:

>I recall a long time ago that Tom Hammond, N0SS, reported that he
>originally had an unexpected birdie with his Field Test K3. I
>believe that he stopped the birdie from signing by tightening up a
>screw on the side panel... perhaps the one that secured the left
>side panel to the internal shield.
>
>I just found the email... URL below. Hope your solution is as quick
>as Tom's was.
>
>http://www.nabble.com/K3-Preliminary-Specifications-to14080072.html#a14080083
>
>73,
>Ken K3IU
>K3 #202
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>Alexandr Kobranov wrote:
>>Hello all,
>>
>>before raising this question to support team I want ask for your
>>experience/opinion.
>>K3/10, 2.7 - 2.1 - 0.4 filters, latest fw
>>
>>On 80m band I have strong (S5) birdie on 3,721MHz, LSB mode
>>(testing without ant)
>>But... when I switch BW from FL2 (2.7) to FL1 (2.1) it completely
>>dissapears. Like switched off...
>>Is it some issue of not so good screw fastening somewhere or is it
>>common "problem"?
>>Any other reports?
>>Thanks for any ideas...
>>73!
>>Lexa, ok1dst
>>_______________________________________________
>>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
>_______________________________________________
>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