I'm using a TS440 which can't switch off the AGC by nature. So  reduced the gain and turned up the LF gain to get a proper feed for the WSPR decoder.

Jan,

I am using a Kenwood TS440 too. I find it a very good RX, both on 137kHz as 500kHz.

It has by default a 20dB attenuator activated between 500kHz and 1.6MHz. But so far I found no need to remove that, as I am using the TX antenna (lazy-L, 11m high, 25m long) also for receiving.

For receiving DI2AN's WSPR I used the 10dB extra attenuator and then reduced RF gain for a stable s-meter. The soundcard is connected to the back audio out connector as, the level there is independent of the LF gain.

73, Rik  ON7YD - OR7T