[Elecraft] [K2] Sensitivity on 17m

[Joe Subich, W4TV]

Bill,

Is the K2 ATU like the ATU in the K3 in that it simply selects values
for 50:50 Ohm rather than physically bypassing?  If so, something has
undoubtedly overwritten the 50 Ohm values.

73,

    ... Joe, W4TV


On 6/18/2013 9:21 AM, Bill W4ZV wrote:
> ATU INIT appears to have restored the sensitivity loss on affected bands.
> Anyone have any ideas what might have caused this problem?  Hopefully ATU
> INIT didn't create other problems!
>
> 73,  Bill
>
>
> Bill W4ZV wrote
>> Mike K8CN and I both came to the same conclusion overnight.  Check the ATU
>> in bypass mode!  Using both RX ANT and forcing bypass via CAL_P, the
>> sensitivity is back on 17m.  I also notice smaller but still noticeable
>> loss on 15m.
>>
>> I didn't build this KAT2 myself but it seems to tune OK for TX on all
>> bands.  I guess it's time for some ATU troubleshooting but other ideas are
>> appreciated.
>>
>> 73,  Bill  W4ZV
>> Bill W4ZV wrote
>>> During a SOTA activation Saturday I used 17m quite a bit as well as 15
>>> and 20.  Sensitivity on 17m seemed weaker than on adjacent bands and I
>>> thought it could be my antenna (44' doublet up 25' with 450 ohm ladder
>>> linie through a BL1 4:1 and KAT2).
>>>
>>> Tonight I decided to check it with my XG3 and indeed the 1uV setting is
>>> noticeably weaker than on 15 and 20.  I first redid RX alignment of L10
>>> and L11 on 15m and then C32 and C34 for 17m with no improvement.  The
>>> S-meter reads the same for all 3 XG3 levels but 1uV sounds weaker on 17.
>>> Anyone have any ideas?
>>>
>>> 73,  Bill  W4ZV
>
>
>
>
>
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