[Elecraft] ticking AGC on K2/100

[Dale Boresz]

Hello Ken,

Sorry about that - no, I meant the KSB2 (SSB adapter board). As I said, 
I have no idea why routing the speaker wire in the vicinity of the SSB 
adapter would cause the AGC to pump, but on my radio, it definitely does.

-Dale

Ken Wagner wrote:

>Hi Dale:
>You first mention the KSB2 board and then the KDSP2 board. It is the KDSP
>board that you are talking about, right?
>73, Ken K3IU
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>----- Original Message -----
>From: "Dale Boresz" <dmb@lightstream.net>
>To: <elecraft@mailman.qth.net>
>Sent: Sunday, October 19, 2003 07:40
>Subject: Re: [Elecraft] ticking AGC on K2/100
>
>
>| Andy,
>|
>| I had this exact problem a while ago before I moved my KPA100 into an
>| external EC2 case along with the KPA100, and I was finding it to be very
>| irritating as well. I stumbled upon the solution in the process of
>| trying to determine the cause - and although this solved the problem, I
>| don't really know why. Anyway, I discovered that (and now it's my turn
>| to say 'this is going to sound stupid') if the speaker wire lies
>| anywhere near the KSB2 board, this pulsing of the background noise
>| occurs. I removed all slack from the speaker wire by bundling up any
>| slack and wrapping a nylon tie-wrap around it so that it would stay up
>| near the control board and away from the KDSP2, and the problem went
>| away. Just to confirm that I had found the solution, I unbundled it
>| again, and allowed it to route over the area of the KDSP2, and the
>| pulsing returned.
>|
>| Regarding why you seem to only see the problem in the morning on a
>| relatively 'empty' band, my guess is that there's simply nothing else to
>| pump the AGC levels around, so you notice it. As band activity
>| increases, the AGC is being activated by signals which are much stronger
>| than the signal causing the pumping action, so it's less noticeable.
>|
>| I hope this helps.
>|
>| -Dale / wa8sra
>|
>| Andy Bullington wrote:
>|
>| >I know this is going to be something stupid when I finally get to the
>bottom of it, but right now it's driving me nuts.  Every once in a while
>| >(usually in the early morning) I notice a pulsing of the background
>noise....
>| >
>| >
>| >
>|
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