Hi Cur error on alignment part III, even at QRPp. 40m only. Rx is good.

[Hagood, Larry]

Hi folks. I'm finishing a new K2 for a friend. When I tried to perform the 40m Tx alignment, I instantly get "HI Cur" and the power drops to zero. This happens if the output power is set to anything above 0.3 watts. This only happens on 40 meters. I was able to peak the output on all the other bands normally.  The Cal Cur is set to 2.5.
I've got the little RF probe built. could someone point me in the right direction as to where to look for the problem?  
Thank you verrrrrry much!
 
73,
AD5VM
 
Larry Hagood
KLA-Tencor
Customer Service Engineer
Intel Service Business Unit
Mobile: [phone]
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[Don Wilhelm-4]

Larry,

If it only happens on 40 meters you have some problem with the 40 meter
Low Pass Filter.
Look at the schematic for RF Board sheet 3 toward the lower right and
you will see the components associated with the 40/60 meter LPF - check
them all for proper values, correct turns on toroids, good soldering,
etc.  Include relay K12 as well.

73,
Don W3FPR

Hagood, Larry wrote:
> Hi folks. I'm finishing a new K2 for a friend. When I tried to perform the 40m Tx alignment, I instantly get "HI Cur" and the power drops to zero. This happens if the output power is set to anything above 0.3 watts. This only happens on 40 meters. I was able to peak the output on all the other bands normally.  The Cal Cur is set to 2.5.
> I've got the little RF probe built. could someone point me in the right direction as to where to look for the problem?  
> Thank you verrrrrry much!
>  
> 73,
> AD5VM
>
>  
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[Hagood, Larry]

Thanks Don! I checked every component in the 40/60m LPF, all caps are the correct value, both inductors have correct windings, hit all solder points again. Still have the same problem.
Also,
On 40 meters, even with power output set to 1.0 watt. The current display shoots straight up to 2.5 (max) On all other bands with power set to 1.0 watt, the current only goes to about .95
Also,
With the power output at 1.0 watt, I compared the RF out at the antenna jack. It's roughly the same for 40 and 30 meters, and I have no problem with 30 meters.
 
Larry Hagood


________________________________

From: Don Wilhelm [mailto:[hidden email]]
Sent: Wed 4/23/2008 7:40 AM
To: Hagood, Larry
Cc: [hidden email]
Subject: Re: [Elecraft] Hi Cur error on alignment part III, even at QRPp. 40m only. Rx is good.



Larry,

If it only happens on 40 meters you have some problem with the 40 meter
Low Pass Filter.
Look at the schematic for RF Board sheet 3 toward the lower right and
you will see the components associated with the 40/60 meter LPF - check
them all for proper values, correct turns on toroids, good soldering,
etc.  Include relay K12 as well.

73,
Don W3FPR

Hagood, Larry wrote:
> Hi folks. I'm finishing a new K2 for a friend. When I tried to perform the 40m Tx alignment, I instantly get "HI Cur" and the power drops to zero. This happens if the output power is set to anything above 0.3 watts. This only happens on 40 meters. I was able to peak the output on all the other bands normally.  The Cal Cur is set to 2.5.
> I've got the little RF probe built. could someone point me in the right direction as to where to look for the problem?
> Thank you verrrrrry much!
>
> 73,
> AD5VM
>
>  


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Help: http://mailman.qth.net/subscribers.htm
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