Topband: 160 mtr low signal - CW Pitch

George Wallner gwallner at
Wed Nov 29 12:01:56 EST 2006

Old timers used low CW pitch for two reasons: You get "natural selectivity"
at low pitch, i.e. at a pitch of 200 Hz, QRM 200 Hz away will be at 400 Hz
(or at 0 Hz), which the ear can easily separate. At a pitch of 800 Hz the
same QRM will be at 1000 or 600 Hz. The other reason is that metallic
membranes of old style head-phones often had a natural resonance around 200
Hz, acting as "mechanical filters". Of course, with good filters, you no
longer need any of these tricks. So with a good rig, pitch is mostly a
matter of preference based on what your ears can hear best.


George Wallner,


-----Original Message-----
From: topband-bounces at [mailto:topband-bounces at]
On Behalf Of BobK8IA at
Sent: Wednesday, November 29, 2006 10:21 AM
To: rtnmi at; Topband at
Subject: Re: Topband: 160 mtr low signal - CW Pitch

In a message dated 11/29/2006 7:52:27 A.M. US Mountain Standard Time,  
rtnmi at writes:

was just  reading articles concerning low signal dxing and CW Pitch on the 
160 meter  band. Is there one pitch better than another
for this?

Here is what  one well known Top Band DXer says:

Note: I like a very low CW pitch of  270 Hz for very weak signal DX-ing.

Please tell me what you think on  this. I have an IC-775 es hit has pitch 
control so it can be  changed.

73 fer nw es gud DX,

I am not sure what it is, but during my nearly 50 yrs of hamming I  have 
always liked the lower pitch. There just seems to be more signal there.
Maybe its 
my ears. I use about 350 Hz here.  

73, Bob  K8IA

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