[Elecraft] KSB2 problem

Sun Sep 15 12:06:02 2002

Steve,

P= 0.1 W?  Have you tried testing it at realistic operating levels 
(e.g., 5 W)?  Seems like 0.1 W might resuld in some wierdness in PA 
operation.

I'd also start with SSBA=SSBC=1 (I think).

73, Phil

Steve Knell wrote:

>Here are some more details re: my KSB2 problem.
>
>It's configured as 0.1W, SSBA=3, SSBC=2:1
>
>The receive audio is excellent.
>
>It's the tx audio which "warbles" and is quite distorted.
>
>I've tried a Heil Pro-set and an Icom HM-36 hand mic (this one needs the
>resistor +5v to AF) but they both sound the same.
>
>U1-16 has the correct voltage on switch-on (6v) but it starts to reduce as I
>transmit.  It then fluctuates before falling to 0v.
>
>U2-6 does the same.
>
>Anyone had a similar problem who can point me in the right direction?
>
>Thanks,
>Steve G0CKP/AB6ZA
>
>
>----- Original Message -----
>From: Phil Wheeler <[email protected]>
>To: Steve Knell <[email protected]>
>Cc: <[email protected]>; <[email protected]>
>Sent: Sunday, September 15, 2002 3:47 PM
>Subject: Re: [Elecraft] KSB2 problem
>
>
>>Steve Knell wrote:
>>
>>>Hi
>>>
>>>I just added the SSB module to my K2.
>>>
>>>I'm getting distorted audio.
>>>
>>RX, TX or both?
>>
>>>
>>>I can't see any bad connections or bridges on the board.
>>>
>>>The problem seems to be around U1/U2.
>>>
>>>U1-16 reduces to zero after a few seconds of tx.
>>>
>>>U2-6 does the same.
>>>
>>>All other voltages checks are ok (U4-6 is at 5.8 instead of 5.1, but
>>>
>that's
>
>>>probably ok?).
>>>
>>>Anyone seen these symptoms before?
>>>
>>You might want to read the notes here and see if something connects.
>>
>>http://www.qsl.net/ve3mcf/elecraft_reflect/index.html
>>
>>Also -- you did not mention what mic you are using and what combo of mic
>>gain and compression you have selected.
>>
>>73, Phil
>>
>>
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>>
>
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