[Elecraft] K1 No RF output UpDate

Thu Apr 22 20:42:00 2004

First QSO made  - 20 CW with ZA/OH2PM
This is going to be fun.

Glenn
----- Original Message -----
From: "Glenn Haffly" <[email protected]>
To: <[email protected]>
Sent: Wednesday, April 21, 2004 11:06 PM
Subject: Fw: [Elecraft] K1 No RF output

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