K2

[Michael Pisani]

Howdy:

Just commenced phase 3 transmitter test.  Results:  excessive current.

Conditions:

Using a 3 amp power supply.  Set K2 at 2 watts power out.  Cal current set to 2 max.  Have analog watt meter connected to K2 and 50 ohm dummy load connected to watt meter.

When "Tune" mode activated, I get "high current on display" it reads 8.0 and my power supply ammeter pegs well over 3 amps and shuts down after 5 seconds.

This will also happen when the front panel output control is set to one watt.

As careful and experienced as i think I may be, I certainly have a problem.

Any suggestions would be greatly appreciated.

Thanks





Michael J Pisani
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[Don Brown-4]

Hi

Use an Ohmmeter to check the resistance to ground on the collectors of the
PA transistors. You may have a damaged insulator allowing the collector to
short to the heatsink.

Don Brown

KD5NDB




----- Original Message -----
From: "Michael Pisani" <[hidden email]>
To: <[hidden email]>
Sent: Friday, March 10, 2006 12:30 PM
Subject: [Elecraft] K2

> Howdy:
>
> Just commenced phase 3 transmitter test.  Results:  excessive current.
>
> Conditions:
>
> Using a 3 amp power supply.  Set K2 at 2 watts power out.  Cal current set
> to 2 max.  Have analog watt meter connected to K2 and 50 ohm dummy load
> connected to watt meter.
>
> When "Tune" mode activated, I get "high current on display" it reads 8.0
> and my power supply ammeter pegs well over 3 amps and shuts down after 5
> seconds.
>
> This will also happen when the front panel output control is set to one
> watt.
>
> As careful and experienced as i think I may be, I certainly have a
> problem.
>
> Any suggestions would be greatly appreciated.
>
> Thanks
>
>
>
>
>
> Michael J Pisani
> _______________________________________________
> 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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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