[Elecraft] [K3] Low output 160/80m

[bill conkling]

Start with K3_support at Elecraft.

...bill nr4c

Sent from my Verizon Wireless 4G LTE DROID

Allan G Duncan <allan.duncan at allanduncan.co.uk> wrote:

>I recently acquired a used K3 from a silent key with a large number of
>options fitted. I already own another K3.
>
> 
>
>I have stripped it down to be a K3/10 to simplify fault finding. The only
>option fitted now is a KXV3 interface. I fitted the bypass link in place of
>the KPA3. All tests are done with a high quality 50 ohm load.
>
> 
>
>There is no RF output on 160m and only about 4-6W on 80m (It varies in
>level, presumably with ALC action). The other bands are all fine on both RX
>and TX. Receive on all bands (including 160/80) measures OK using my XG3 as
>a test signal. Using a 50MHz scope around the BPF area does not show and
>obvious fault with the K3 in TX mode with a cw carrier. The RF power output
>control works as expected on all bands except 160 and 80.
>
> 
>
>The TX Gain calibration routine in the K3 Utility fails immediately as the
>first band it tries is 160m.
>
> 
>
>I'd welcome any comments before I start swapping boards between my two K3's 
>
> 
>
>73
>
> 
>
>Allan
>
>GM4ZUK
>
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