[Elecraft] K2: High SWR On Dummy Load

[Ariel Jacala]

Thanks to Jim, Vic and Don for the return comments

I disconnected the KPA100 and put on the K2 top with the KAT2 ATU.  With the K2 ATU connected and the dummy load connected - the SWR correctly reads 1:1 with menu set for CALS.  With the menu set to CALP, the power levels appeared to modulate correctly with the PWR knob although this is an item i have to double check.  With the ATU disconnected, the displayed power on tune differs from the power setting.  This suggests to me that there is something wrong with the base K2.  I still have to do what Don suggested about connection to an external watt meter.

Any additional ideas are welcome.

Ariel NY4G
Sent from my iPad

On Oct 25, 2012, at 8:21 AM, "Don Wilhelm" <w3fpr at embarqmail.com> wrote:

> Ariel,
> 
> I would think your K2 finals are OK (for now).
> My best guess is that you have a KPA100 and a static charge has damaged diodes D16 and D17 in the KPA100.  If you do not have the KPA100, then you most likely have the KAT2 and the diodes are D1 and D2 - the same principle applies.
> 
> To test my theory, connect an external wattmeter between the K2 and the antenna.  Set the power control to 2 watts and do a TUNE - what is the power indicated by the external wattmeter?  If it is substantially higher than the set power, there is something wrong with the wattmeter in the KPA100 (or KAT2) - replace the diodes.
> 
> Be aware that those diodes are damaged by a static charge on the feedline.  You should have a DC path across the feedline and the coax shield should be grounded.  In any case, install an antenna switch and switch the K2 to a dummy load when not in use.
> 
> 73,
> Don W3FPR
> 
> On 10/24/2012 10:18 PM, Ariel Jacala wrote:
>> My. K2/100 is acting up in that it is showing high SWR even on a dummy load.  Any ideas on whether the K2 finals may be blown? It behaves the same way on all the bands.  It displays high current with the power set to 3 watts or more.  My K2 is SN7105.
>> 
>> Will appreciate diagnostic help.
>> 
>> 
>