[Elecraft] [K2] No Transmit Power

[Brian Denley]

?Don:
I am still trying to get my K2 kit to transmit.  Since my last post, I have 
purchased a power meter and confirmed that virtually no power comes out of 
the antenna jack when the transceiver is keyed (the meter barely moves on 
the 20 watt scale).  I also purchased a new RF probe kit and so far have the 
same dismal result:  the lowest voltage I can measure (probing nothing) is 
380 mV, and also 380mV when I attach the ground clip to the probe tip. 
Touching my finger to the probe tip gives no result as well.  This probe was 
built with new components from Elecraft, the diode is in the way the silk 
screen indicates (for the banded end). there is no other way to build it! 
The only idea I have is to take the probe into work and check it with a nice 
new Fluke meter with the idea that my 2 multimeters are just not suitable or 
have the wrong input impedance (needs to be ~10Megohms if I understand the 
probe circuit).  Without some way of measuring RF in the transmitter circuit 
I am just shooting in the dark.

I attempted to check Q24 but it's solder joints are placed right under the 
small SMT board that is mounted on the backside of the RF board and 
difficult to reach unless I remove that board.

Brian Denley
http://home.comcast.net/~b.denley/index.html


----- Original Message ----- 
From: "Don Wilhelm" <don at w3fpr.com>
To: "Brian Denley" <b.denley at comcast.net>
Sent: Monday, September 20, 2010 6:23 PM
Subject: Re: [Elecraft] [K2] No Transmit Power


>  Brian,
>
> If there is nothing coming from the internal power detector, you will not 
> see deflection on the K2 bargraph when keying.
> It could be a K2 transmit problem or it can be a problem in the RF 
> detector.  Hard to tell which without further measurements.
>
> 73,
> Don W3FPR