K2/100 Filter Question

[David Fleming-4]

I noticed last night that when I change filters from FL1 (opt1) to FL2
(700hz) in CW mode, the received signal shifts down in frequency by
about 20Hz. Likewise, in CW-N mode, it shifts up by 20Hz. The other two
filters are right with FL1. The shift only occurs with FL2. I didn't
notice this prior to installing the KPA100. I had the filters setup
perfectly using Spectrogram, and all of the settings are just as they
were after the initial setup. Will I need to go through the entire
process again? Or is there a way to get only FL2 back on frequency?

Also, I assume (hope) that it is normal for the heat-sink to get quite
HOT after a typical qso at 25wpm? Not spit sizzling hot, but hot enough
to where I can't leave my hand on it for more than a second or two. I
worry that I don't have the bias set exactly where it should be. It's
difficult to set the bias current accurately because the current rises
so rapidly after entering TUNE mode. And the current at the very start
varies depending on how warm the transistors are at the time - if that
makes sense. Just a little paranoid. I don't want to fry my finals.

Thanks!

-David W4SMT

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[Brett gazdzinski-2]

 
You can just tweak the BFO settings I think, that's
what I did.
I did not have anything change with the kpa100, and I have
had the k2 back and forth as a K2 and a k2/100, and the filter stuff
did not change...

I have not had any long qso's, but in testing into the dummy load,
I don't find my heat sink getting very warm, let alone hot.

I was careful in setting the bias so that just the initial readings
were what I went by.

I set my fan to be on low all the time, its silent so why not?
Never had it go to high speed...

Brett
N2DTS

 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of David Fleming
> Sent: Wednesday, April 25, 2007 11:12 AM
> To: [hidden email]
> Subject: [Elecraft] K2/100 Filter Question
>
>
> I noticed last night that when I change filters from FL1 (opt1) to FL2
> (700hz) in CW mode, the received signal shifts down in frequency by
> about 20Hz. Likewise, in CW-N mode, it shifts up by 20Hz. The
> other two
> filters are right with FL1. The shift only occurs with FL2. I didn't
> notice this prior to installing the KPA100. I had the filters setup
> perfectly using Spectrogram, and all of the settings are just as they
> were after the initial setup. Will I need to go through the entire
> process again? Or is there a way to get only FL2 back on frequency?
>
> Also, I assume (hope) that it is normal for the heat-sink to get quite
> HOT after a typical qso at 25wpm? Not spit sizzling hot, but
> hot enough
> to where I can't leave my hand on it for more than a second or two. I
> worry that I don't have the bias set exactly where it should be. It's
> difficult to set the bias current accurately because the current rises
> so rapidly after entering TUNE mode. And the current at the very start
> varies depending on how warm the transistors are at the time - if that
> makes sense. Just a little paranoid. I don't want to fry my finals.
>
> Thanks!
>
> -David W4SMT
>
> _______________________________________________
> Elecraft mailing list
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> 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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