K2 Transmit problem

[Michael van Hauten]

Hello,
doing the 40m transmitter alignment, i saw that my new K2 (#6454) has  
no rf out and Q6 becomes  hot.  The built in meter goes to 0.1 W. I  
checked and rewound T2 and T3 but there is no other result, The  
problem exists on all bands.

With  the power setting at 2 Watt,  power consumption was  500mW  
( 220mW  in receive). Receive seems ok .

Any ideas? Thanks for help.

Michael, DC0ZO
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[Don Wilhelm-4]

Michael,

Q6 getting hot is likely caused by excessive DC bias.
Check the voltage on the base and the emitter (compare with the DC
voltage chart) for the transmit condition.

Other components that deserve to be checked are RFC6, R49, C120, C121,
T1, R47, R48, C124, C125, Q10, and R46.

73,
Don W3FPR

Michael van Hauten wrote:

> Hello,
> doing the 40m transmitter alignment, i saw that my new K2 (#6454) has
> no rf out and Q6 becomes  hot.  The built in meter goes to 0.1 W. I
> checked and rewound T2 and T3 but there is no other result, The
> problem exists on all bands.
>
> With  the power setting at 2 Watt,  power consumption was  500mW (
> 220mW  in receive). Receive seems ok .
>
> Any ideas? Thanks for help.
>

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