Utility of Notch on AF-stage ?
 

Hi,

The kenwood TS-570D, according the documentation is equipped with a notch.
Theoretically this is a very useful feature to cancel QRM in the center of a
frequency and be able to listen to weak stations.

But at first sight there no such a NOTCH control on the TS-570D...
Can some one explain me who is right (me or the manufacturer) ?

My explanation is next : is it possible that the notch, even if it is not
provided as an external button on the front panel is in fact well included
(like "built-in") in the AF-stage circuit of this RTX ?
That could explain the fact that it is not very useful in reducing a signal
in the middle of the frequency vs. a model working at the IF-stage.

Your comments are welcome
Thanks in advance

73
Thierry
ON4SKY
http://www.astrosurf.com/lombry/qsl-ts570.htm

In article ,
Thierry To answer me in private use http://www.astrosurf.com/lombry/post.htm wrote:
Hi,

The kenwood TS-570D, according the documentation is equipped with a notch.
Theoretically this is a very useful feature to cancel QRM in the center of a
frequency and be able to listen to weak stations.

But at first sight there no such a NOTCH control on the TS-570D...
Can some one explain me who is right (me or the manufacturer) ?

From what I can see in the manual, the TS-570D (like the TS-2000) has
an adaptive notch filter implemented in the audio DSP. It's not a
single notch - it can actually detect and notch out multiple tones.
Hit the BC (Beat Cancel) control to enable it. It's on page 38 in the
manual.

I don't see anything in the manual which would indicate the presence
of a user-adjustable notch filter (IF or audio). You can adjust the
upper and lower frequencies of the signal passband, but there isn't a
manually-adjustable notch within the passband.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

In article ,
Thierry To answer me in private use http://www.astrosurf.com/lombry/post.htm wrote:
Hi,

The kenwood TS-570D, according the documentation is equipped with a notch.
Theoretically this is a very useful feature to cancel QRM in the center of a
frequency and be able to listen to weak stations.

But at first sight there no such a NOTCH control on the TS-570D...
Can some one explain me who is right (me or the manufacturer) ?

From what I can see in the manual, the TS-570D (like the TS-2000) has
an adaptive notch filter implemented in the audio DSP. It's not a
single notch - it can actually detect and notch out multiple tones.
Hit the BC (Beat Cancel) control to enable it. It's on page 38 in the
manual.

I don't see anything in the manual which would indicate the presence
of a user-adjustable notch filter (IF or audio). You can adjust the
upper and lower frequencies of the signal passband, but there isn't a
manually-adjustable notch within the passband.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!