K1 no output on 20 - KFL1-4 problem?

[kl7r]

K1 Serial 02129
KFL1-4
No output on 20 meters
Works fine on other bands.

It used to work.

I did some signal tracing.
I see signal on pin 1 and 2 of P1 of the filter board for all bands
I signal on pin 2 of T1 on all bands
I see no signal on pin 4 of T1 on 20 meters - good signal on all other
bands.

What could cause this behavior?
Signal is going through T1 on other bands.
Could there be something drawing down the signal on 20 meters?
I looked for shorts and didnt see any on the filter board.

Mike
KL7R



 
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[Greg-133]

Mike,

I'd sure be curious if you find out what is causing the NO output on
20 meters. I'm experiencing the same problem and have been doing so
for some time. I've done a lot of trouble shooting as well but to no avail.

Do you receive signals on 20 meters? I do.
If I plug in the two band (40 and 20 meter) board all is well on 20
meters so I know the problem lies with the KFL1-4.

In signal tracing I have signals from both 1 and 2 of T1 (pin 1 and 2
respectfully on P1) but when switch to the 20 meter band these
readings are considerably lower than the readings for the other
bands. On pin 2 of T2 I have no readings for 20 meters but good
readings for the other three bands. Pin 4 of P1 likewise shows no
signal for 20 meters.

I've checked the board for shorts as well as maybe a bad solder joint
but all looks good.
Oh yes, my 4 band board worked good for quite a spell before loosing
20 meters. This looks to be a problem experienced
by several of us that have purchased the KFL1-4 board.

I'm looking for a solutions as well and would appreciate input from
anyone with an idea. Or, help please.

72,
Greg
KI8AF




At 19:12 09/12/2006, you wrote:

>K1 Serial 02129
>KFL1-4
>No output on 20 meters
>Works fine on other bands.
>
>It used to work.
>
>I did some signal tracing.
>I see signal on pin 1 and 2 of P1 of the filter board for all bands
>I signal on pin 2 of T1 on all bands
>I see no signal on pin 4 of T1 on 20 meters - good signal on all other
>bands.
>
>What could cause this behavior?
>Signal is going through T1 on other bands.
>Could there be something drawing down the signal on 20 meters?
>I looked for shorts and didnt see any on the filter board.
>
>Mike
>KL7R
>
>
>
>
>____________________________________________________________________________________
>Do you Yahoo!?
>Everyone is raving about the all-new Yahoo! Mail beta.
>http://new.mail.yahoo.com
>_______________________________________________
>Elecraft mailing list
>Post to: [hidden email]
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
>Help: http://mailman.qth.net/subscribers.htm
>Elecraft web page: http://www.elecraft.com

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[Tom Arntzen-2]

My K1 Serial 1491 with KFL1-4 also died on 20m for no apperant reason.
This happend only few weeks ago.
The K1 had been off air ( shame on me) for 2-3 months.
Arrived at my holiday QTH , unpacked and powered up the K1 and it wouldn't
tune on 20.
No rx noice when tuning the vfo over the band.
I popped the hud to look for any fault while tapping on the trimcaps and
xtales.
Bingo. A tapp on the 20m xtal made the beast go alive.
It has worked since then , but I suspect the xtal to die again.
It seems that most of us has the same problem caused by a faulty xtal that
came from a bad productionrun.
Elecraft could send us new xtals as a xmasgift :-)

73 de Tom LA1PHA
K1-4 #1491
K2/100 #3829

----- Original Message -----
From: "Greg" <[hidden email]>
To: <[hidden email]>
Sent: Sunday, December 10, 2006 1:51 AM
Subject: Re: [Elecraft] K1 no output on 20 - KFL1-4 problem?

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