[Elecraft] KX1 Please need help with T/R thump

[Jerry W7ANM]

Don,

I did extract the old Q7 without any damage or problems.

I was looking at the spec sheet for the 2N3904 after getting your last
suggestion and after ordering the 2N4124 from Elecraft. Do you think the
2n3904 is a superior replacement for the 2n4124? Any reason to suspect it
would not work or why the 2n4124 was chosen for that circuit?

73,
Jerry


On Wed, May 25, 2011 at 5:13 AM, Don Wilhelm-4 [via Elecraft] <
ml-node+6402456-905309443-54238 at n2.nabble.com> wrote:

>   Jerry,
>
> That voltage would indicate Q7 may be at fault.
> If you do not have a proper replacement, but do have a 2N2222A or 2N3904
> in stock try one of those as a test.
>
> 73,
> Don W3FPR
>
> On 5/24/2011 11:48 PM, Jerry W7ANM wrote:
>
> > Thanks Don,
> >
> > Maybe were getting somewhere. Q7s base is at zero during receive but on
> > transmit it only goes to 0.1v.
> > The 6T_2 voltage on the other side of R28 goes from 0v during receive
> then
> > to 5.63v on transmit. (Normal?)
> >
> > Looks like I will need to get another Q7?
> >
> >
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