[Elecraft] DM780 question

[Jim Brown]

Not quite. Software like HRD PSK31 and DM780 (very good software) 
is designed to look at detected audio from a radio running in USB 
mode. What you'll see in a waterfall display is all of the signals 
that fit within the bandwidth of the radio (typically about 2.6 
kHz, but adjustable to any bandwidth you choose based on what the 
radio itself can do). DM780 has the additional capability of 
reading the radio's carrier frequency, adding to it the audio 
frequency, and displaying that at the top of the waterfall!  

If you used DM780 to for CW but had the radio set for USB, it 
would be like any other stream -- offset by whatever frequency 
that station was from the carrier, just like a PSK or RTTY signal. 

When you run software like HRD PSK31 and DM780 with a radio in USB 
mode, you see all the noise in that 2.6 kHz bandwidth. With the 
K3, you would use one of the digital modes, because they are 
optimized for modes like RTTY and PSK. See the manual for details. 
The K3 has the additional capability to narrow up the the 
bandwidth a LOT to make a huge reduction in noise. This can really 
help when copying weak signals. You do this using the Width and 
Offset controls.

Hope this helps.  

73,

Jim K9YC

--Original Message Text---
From: Adam Koczarski
Date: Thu, 8 Jan 2009 08:06:08 -0800

When I tune the K3 to a frequency it makes sense to me that I see 
data streams in the waterfall that are in the side band to the 
right of the tuned frequency. When I tune in a CW signal and zero 
beat it using the tone feature of the K3, shouldnt the CW stream 
be right at the left edge of the waterfall since its just the 
carrier being modulated? 


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