[Elecraft] ticking AGC on K2/100

Sun Oct 19 08:38:01 2003

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" <[email protected]>
To: <[email protected]>
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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