K3 RX Ant question

[Alan Price-3]

I have a K2 with the KBPF3 option, among others.  When I listen to the BC band with the KBPF3, it sounds great, but when I listen to any shortwave frequencies, the KBPF3 does not make a real difference.  Am I missing something?
 
73
Alan
W1HYV    
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[Guy, K2AV]

That sounds about right.

"Make a difference" is a problematic understanding unless you are
talking before and after installing.  Once installed in your K3 RX the
KBPF3 is invoked whenever you are listening on any frequency that
requires it.  So A/B testing is hard, unless you have the K3 opened up
and are putting it in and taking it out making comparisons.

The ham bands have pass band filters in use, and reception gradually
diminishes tuning into the HF broadcast bands.  Without the KBPF3,
this diminishment is gradually heard, but is not hugely noticeable,
say in the 40m commercial broadcast band, given the power levels some
stations are running. The AM BC band IS severely attenuated by the K3
through main ant jack(s) without the KBPF3 and RX and jumps up quite a
lot listening through the RX antenna and KBPF3.

73, Guy.

On Sun, Sep 5, 2010 at 11:49 AM, Alan Price <[hidden email]> wrote:

>
> I have a K2 with the KBPF3 option, among others.  When I listen to the BC band with the KBPF3, it sounds great, but when I listen to any shortwave frequencies, the KBPF3 does not make a real difference.  Am I missing something?
>
> 73
> Alan
> W1HYV
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
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[Kim Bottles]

I find that my KBPF3 makes SWL worse. If I turn it off in the configure menu it works much better, so I must think it is not working. I sent a message to K3 support and am waiting for an answer. My KBPF3 is brand new so I am guessing that despite wearing the wrist grounding strap and using a ground pad the static may have gotten mine.

Kim - K7IM
 

-----Original Message-----
From: Alan Price [mailto:[hidden email]]
Sent: Sunday, September 05, 2010 8:50 AM
To: Elecraft
Subject: [Elecraft] K3 RX Ant question


I have a K2 with the KBPF3 option, among others.  When I listen to the BC band with the KBPF3, it sounds great, but when I listen to any shortwave frequencies, the KBPF3 does not make a real difference.  Am I missing something?
 
73
Alan
W1HYV    
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[Bill VanAlstyne W5WVO]

First, I assume you meant "K3", not "K2" --

I assume what you are doing is just going into the CONFIG menu, finding the
KBPF3 item, and turning the knob between "NOR" and "NOT INST", and seeing no
difference. This is normal behavior, because you are not actually changing
anything.

You have to POWER DOWN the K3 and then power it back on for the change to
take effect. Tune in a SWBC station on, say, 31 meters, and perform this
test turning the K3 off between setting changes. You'll see having the KBPF3
in-circuit makes a difference of several S units.

Bill W5WVO


--------------------------------------------------
From: "Alan Price" <[hidden email]>
Sent: Sunday, September 05, 2010 15:49
To: "Elecraft" <[hidden email]>
Subject: [Elecraft] K3 RX Ant question

>
> I have a K2 with the KBPF3 option, among others.  When I listen to the BC
> band with the KBPF3, it sounds great, but when I listen to any shortwave
> frequencies, the KBPF3 does not make a real difference.  Am I missing
> something?
>
> 73
> Alan
> W1HYV
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>

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