KX1 problems

classic Classic list List threaded Threaded
2 messages Options
Reply | Threaded
Open this post in threaded view
|

KX1 problems

Doug Person-2
Just finished my KX1. Unfortunately, it won't produce any output on
transmit. Receive is excellent. Toroids are solid. Board was carefully
inspected with good magnifier. All solder joints are solid and clean.

I get the following voltages in "tun" mode:

Q6: B=0v C=12.67v E=0v

Q5: C=12.67v B=1.07v E=.94v

Q4: C=1.07v B=1.06v E=.32v

Any helpful pointers on debugging this problem will be greatly appreciated.

73, Doug -- K0DXV
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Reply | Threaded
Open this post in threaded view
|

Re: KX1 problems

Don Wilhelm-4
Doug,

Except for the voltages on Q4, the DC voltages look OK.  Check R9 and
R26.  The voltage at both ends of R26 should be near 6 volts.
Did you put the jumper between J7 pins 1 and 3?
How do the toroid leads look?  Well stripped and tinned with a bit of
tinned lead showing on the toroid side of the board?  Look particularly
at T1's green winding.
R4 started out fully counterclockwise (if you followed the
instructions), and there will be no RF output at that setting.  Do you
get any RF when R4 is advanced clockwise?

73,
Don W3FPR

73,
Don W3FPR

Doug Person wrote:

> Just finished my KX1. Unfortunately, it won't produce any output on
> transmit. Receive is excellent. Toroids are solid. Board was carefully
> inspected with good magnifier. All solder joints are solid and clean.
>
> I get the following voltages in "tun" mode:
>
> Q6: B=0v C=12.67v E=0v
>
> Q5: C=12.67v B=1.07v E=.94v
>
> Q4: C=1.07v B=1.06v E=.32v
>
> Any helpful pointers on debugging this problem will be greatly appreciated.
>
> 73, Doug -- K0DXV
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.409 / Virus Database: 270.13.71/2331 - Release Date: 08/28/09 06:26:00
>
>  
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html