[Elecraft] K2: Hi Cur problem solved

[Don Wilhelm]

Daniel,

It is not common to find a bad capacitor, but indeed it does happen.
In situations where something like that is expected, I usually do a 
sweep of the LPF to reveal the approximate filter cutoff frequency.   A 
bad component in the LPF will show up readily using that technique (but 
you still have to figure out which component, usually by trial and error).

It is possible to sweep the K2 LPF with an antenna analyzer connected to 
the BNC jack, but you must isolate the input of the LPF and connect a 51 
ohm resistor (easy to do if the K160RX is installed, but requires 
removing the W1 jumper if it is not.

73,
Don W3FPR.

Daniel Schlieper wrote:
> Hi,
>
> my K2 (#4271) had a HI CUR problem. While all other bands were fine, I 
> got a HI CUR error message on 80m, and output was down to 5 W.
>
> I checked and rewound the coils of the low pass filter (L16, L17) and 
> touched up the solder joints of the capacitors C190, C191, C192. No joy.
>
> But the problem was cured when the capacitors were replaced with new 
> ones. How frequent is is to come across broken capacitors?
>
> 73 Daniel M0ERA
> -- 
>
> M0ERA, Oxted, Surrey, UK
>
>
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>