[Elecraft] Re: K1 - No output on 20M

[John Huffman]

Dave -

I looked at the filter board.  It was the very first kit I put together and
the first board.  I was surprised how stingy I had been with solder.

As they say, 90% of problems can be traced to soldering.  I remelted each
joint (small board so it was easy to do) and that fixed it.  I repeaked the
slugs and all is well.

Thanks for steering me to the filter board.

73 de NA8M
John

----- Original Message -----
From: "Dave Hottell" <hottell@gulftel.com>
To: "John Huffman" <hjohnc@core.com>
Sent: Friday, June 27, 2003 12:32 PM
Subject: Re: K1 - No output on 20M


> John,
>
> The problem has to be on the filter board.  All band specific components
> are on there.  If 40m works OK then everything on the RF board is OK.
>
> Inspect the filter board closely with a magnifiying glass.  Look at each
> component that is used on 20m.  Look for a lead that has the solder broken
> all around it.  Use an ohm meter to check continuity through the
inductors.
>  Also check for a sudden short to ground.
>
> If you don't have one, you may have to construct an rf probe and trace the
> signal along the path.  You are losing the signal somewhere on that board
.
> . .
>
> You may be able to find it by just touching a screwdriver to each point
> through the path.  On Rx you will hear a large increase in noise just as
> you pass the fault.  You hold you finger against the metal of the
> screwdriver and act as the antenna - or you can wrap a wire around the
> driver blade.  I doubt that the rx is really OK.  You hear something, so
> you think it is OK, but really the signal is down quite a lot from what it
> should be.
>
> Let us know what you find.
>
> 73 de Dave
> ab9ca/4
>
>
>
>
>
> At 10:32 AM 6/27/03 -0400, you wrote:
> >My K1 has been perking along just fine until now.  But, now I have no/low
> output on 20m.  Here's the details:
> >
> >K1 - 1302, 2 band (40M and 20M)
> >40M all is well, receiving and transmitting.
> >20M receives OK but transmit power is 0.1W, raising to 0.2W after a few
> seconds.  Test is into a dummy load.
> >
> >I checked the 22 MHz crystal and can hear it on my other receiver (K2).
> >
> >I repeaked the band filters for 20M.
> >
> >I have OUT set at 2.5W and "b2" set for 14.
> >
> >It has worked fine since last August up until now.
> >
> >Any suggestions are most welcome!
> >
> >73 de NA8M
> >John
> >
> >
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