Dear Andrey.

here this is happening because the receiver's gain control or noise blanker 
reacts on DCF39 or HGA22 telegrams. They normally occur every 11 seconds. The 
receiver then modulates all signals in the passband, and gives them a set of 
sidebands 1/11s = 0.09 Hz apart.

Switching off AGC and NB will remove the sidebands on the signals completely, 
but at the cost of an increased background from the original DCF FSK sidebands.

Kind regards,
MArkus (DF6NM)


----- Original Message ----- 
From: "Andrey rn3agc" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 20, 2009 12:28 PM
Subject: LF: "harmonics"


Hello LF,

At strong levels of a signal such "harmonics" are formed here.
Somebody knows the reason of formation of these "harmonics"?

73 Andrey