[Elecraft] Radio Resets By Itself

Fri May 2 11:02:00 2003

Excellent point Ron. When I read the message regarding BFO drift, it sounded
like you should "key down" for about 10 minutes to "heat up" the interior of
the K2, something I did not feel comfortable doing.
Sending CW for 10 minutes is far more acceptable.

Thanks,
Larry
WA2DGD
----- Original Message ----- 
From: "Ron D'Eau Claire" <[email protected]>
To: <[email protected]>
Sent: Friday, May 02, 2003 10:41 AM
Subject: RE: [Elecraft] Radio Resets By Itself

There's a resettable fuse in the K2. It sounds like that is tripping and
shutting down the K2. If you are trying to run the K2 at 100% duty cycle,
the finals may be drawing enough current as they heat up to trip it, then it
resets once things cool down.

When you say "transmitting" into a dummy load, what are you transmitting,
Jason?

Are you sending normal CW or are simply holding the key down (uninterrupted
carrier)?

The K2 is not rated for 10 watts output with the key down (that is, 100%
duty cycle).

I ran a number of tests of the stability transmitting into a dummy load, but
always sent CW. I loaded up a message buffer and set it in "repeat" mode
most of the time. It seemed to work as well to send dits or dahs (although
the latter has a much higher duty cycle).

Ron AC7AC
K2 # 1289

-----Original Message-----
Last night I was trying the frequency stability test as outlined in the K2
Temp-Comp Pll Ref Upgrade. ...I transmitted into a dummy load with 10 watts
for a period of time.  ... about 2 to 3 minutes at 10 watts and then the
radio would reset itself with elecraft being displayed and the output power
dropping to zero.  Then after the reset, the power would return and then it
would reset again.  Here are some of the specifics.

K2 with all of the options except the KPA100
Voltage and current on rx as displayed    13.4v at 300ma
Voltage and current on tx (10 watts) as displayed    12.4v at 2.78a
Good dummy load with low swr
ATU in cal s so as to bypass it

The problem appears to heat related because the time to failure is dependant
on cool down time.  Does anyone have any ideas?  Thanks.

Jason

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