[Elecraft] K2 : to release all the LPF-Relais

[Don Wilhelm]

Luc,

That is not a possibility, and if you attempt to make resistance 
measurements, everything will appear to be grounded.  If you temporarily 
lift the #3 lead to T4 you will remove the LPF from the PA and you can 
make resistance measurements.

The relays in the K2 are latching, so you can activate the relays for 
one particular band, then turn off power and the filter for that band 
will still be selected.

An easy way to check the LPF is with an antenna analyzer.  However, you 
must terminate the LPF in 50 or 51 ohms.  If you have the K160RX 
installed, remove that option and put the leads of a 51 ohm resistor 
into pins 6 and 7 of J14.  If the K160RX is not installed, remove W1 and 
connect the resistor between the right end of W1 and to any convenient 
ground point.
With the filter termination in place, you can connect the antenna 
analyzer to the BNC jack and scan the band selected by the K2 to observe 
the SWR or whatever characteristics your analyzer can measure.

73,
Don W3FPR

Luc Favre wrote:
> Hi all,
> There is a possibility to release all LPF-Relais in the K2/10 PA (very 
> usfeul to test the LBF). Could some one refresh my failing memory ?
> 73 es TU
> Luc/F6HJO/HB9ABB
>  
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