K2 : to release all the LPF-Relais

[luc Favre-2]

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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[Ingo Meyer, DK3RED]

Bonjour Luc,

> 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 ?

Turning power off/on in the INIT mode of the ATU clears all L-C-network data
--
73/72 de Ingo, DK3RED - Don't forget: the fun is the power!
        www.qrp4fun.de - [hidden email]
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[Don Wilhelm-4]

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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