[Elecraft] K2 bring-up

Sun Apr 27 16:05:04 2003

Hi Bruce,

Thanks for the response. I'm getting there (I think...).

Q4 (another 2N7000 - I don't have much joy with those...) was u/s and the 8
volt receive rail wasn't going away when I keyed the TX. Now fixed - good
job I've got a drawer full of the buggers!

I also lifted C121 so as not to drive the PA when hitting the key. That
allowed me to probe earlier parts of the circuit without the uP resetting.

I'm still having problems around the TX mixer with a nice fat VFO signal on
pin 6 of the 602 but absolutely zip on the output (pin 4). Beginning to
suspect the 602.

I'm at the bench at the moment so this info may be out of date by the time
that you read it.

The RX though (which seems fine) is a joy to work with although it's only
tweaked for 40m at the moment. I just need to be able to read Morse at least
as fast as I can send it...(I'm a 46 year old HF newbie and still learning
lots ;-)).

Loadsa fun.

Best,

Paul :-)

----- Original Message -----
From: "Bruce D. McLaughlin" <[email protected]>
To: "'Paul Bartlett'" <[email protected]>;
<[email protected]>
Sent: Sunday, April 27, 2003 8:00 PM
Subject: RE: [Elecraft] K2 bring-up

> You don't suppose you are getting RF into the power supply?  I have a 3
> amp switching power supply for my K2 and there were no problems such as
> you describe.  You probably are running a 2 amp supply too hard at full
> power output, but that wouldn't account for the overload at minimum
> power.
>
> Bruce - W8FU
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Paul Bartlett
> Sent: Saturday, April 26, 2003 9:23 AM
> To: [email protected]
> Subject: [Elecraft] K2 bring-up
>
> Hi All,
>
> I've just reached the stage of commissioning the TX. (Alignment and
> test,
> Part III)
>
> Every time I key the TX, the PSU I'm using (14V current limited at 2A)
> flashes it's over current LED and the control CPU reboots.
>
> I've checked (most of) the DC levels against the DC voltage tables for
> the
> RF board and all seem to be in the ballpark. Trouble is, as soon as I
> try
> 'TUNE' or key the transmitter, the thing resets.
>
> I've set o/p power to minimum and limted TX current to well within the
> capabilities of the PSU but to no avail.
>
> I suspect I've got a short somewhere and will make a further detailed
> visual
> inspection shortly. In the meantime, has anybody else had a similar
> experience?
>
> Best,
>
> Paul
>
>
>
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