[Elecraft] spectrogram

[n3drk]

Great point Tom. Thanks.
john


----- Original Message ----- 
From: "Tom Hammond" <n0ss at earthlink.net>
To: "n3drk" <n3drk at triad.rr.com>; <ab4cz at comcast.net>; "elecraft" 
<elecraft at mailman.qth.net>
Sent: Sunday, January 22, 2006 3:30 PM
Subject: Re: [Elecraft] spectrogram


> Any time you use an audio-based oscilloscope, monitoring the AF output 
> from your receiver, you have to be aware that whatever you see on-screen 
> is not only representative of the signal itself BUT to a bigger extent it 
> reflects those characteristics placed upon it by the receiver itself (it's 
> filters, the AGC characteristics, etc.). As a result, you should always 
> remind yourself that what you're looking at (if it's coming thru the 
> receiver's audio system) is not necessarily what is actually 'on the air'.
>
> 73,
>
> Tom Hammond    N0SS
>
> At 11:55 AM 1/22/2006, n3drk wrote:
>>Listed below is a link for a Windows based Oscilloscope. This can be used 
>>for transmitting but I do not know about receiving. What do you guys 
>>think? By  the way thanks to all for responding to my original post.
>>
>>http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=3428
>>
>>
>>73s
>>john-n3drk
>>
>>
>>----- Original Message ----- From: <ab4cz at comcast.net>
>>To: "n3drk" <n3drk at triad.rr.com>; "elecraft" <elecraft at mailman.qth.net>
>>Sent: Sunday, January 22, 2006 9:31 AM
>>Subject: Re: [Elecraft] spectrogram
>>
>>
>>>
>>>John,
>>>
>>>Sjpectrogram is a FFT (Fast Fourier Transform) spectrum analyzer program. 
>>>It's display is amplitude versus frequency.  What you need to display the 
>>>"Christmas Tree" and CW waveforms is an  oscilloscope display.  In the 
>>>case of the Christmas Tree, the oscilloscope is set up to display RF 
>>>drive or audio on the horizontal axis and RF output on the vertical axis 
>>>(the oscilloscope is in X-Y mode, with x=drive, Y=RF out).  For the cw 
>>>envelope you use the oscilloscope in the conventional mode where the 
>>>horizontal axis is time and the vertical axis is voltage.  So the short 
>>>answer to your question is "NO".
>>>
>>>jim, AB4CZ
>>>
>>>>can Spectrogram also show the
>>>>Christmas Tree effect for SSB? How about the rise and fall of the CW 
>>>>note?
>>>>What about in receive mode. Can it also show these for the received 
>>>>station?
>>
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