Fw: [Elecraft] K1 No RF output

[Glenn Haffly]

Found three problems - Made corrections and have RF output on all 4 bands.
Thanks to all for your help.

Glenn
K5ZE
----- Original Message -----
From: "Glenn Haffly" <ghaffly@stic.net>
To: <Elecraft@mailman.qth.net>
Sent: Wednesday, April 21, 2004 12:24 AM
Subject: [Elecraft] K1 No RF output


> Rx portion works fine all 4 bands
>
> Tx no Rf out . So far I have made voltage measurements at :
>
> Chips U1 U2 U3 U4 U7 all correct according to DC voltage chart.
>
> U9 has problems:
> Pin 2 should be 6.8 v , measure .331
> Pin 3 should be 6.8 v , measure .630
> Pin 6 should be 6.8 v , measure .331
> Pin 7 should be 13.6 v and does measure 13.6 v
>
> If you trace Pin 6 back it has a junction of D5 and D14. At this junction
I
> have 5.03 v.
>
> RF Q6
> Base zero should be 1.1 v
> Collector ok at 13.6 v
> emitter zero should be .5 v
>
> RF Q7 OK
> Base zero
> Collector 13.6
> Emitter zero.
>
> Have done the obvious of verifing correct location of IC's and diodes.
Also
> resoldered a few
> leads in case of cold joints. I would think the U9 problem needs to be
> corrected before
> looking at Q6 again. I will do more voltage checks tomorrow.
> Would appreciate any ideas of what to look at that I might have
overlooked.
>
> Glenn
>
>
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