[Dstar] D-Star Bandwidth

[Steven Samuel Bosshard (NU5D)]

http://www.bosshardradio.com/dstar/spectrum/IMG_0576.JPG and
http://www.bosshardradio.com/dstar/spectrum/ are some jpeg images of the
GMSK demodulated waveform from an IC91AD using an IFR COM120 B (PMR)
radio service test fixture.  This is not a laboratory type measurement -
just an ordinary mobile radio service shop type photo.  The 0576.jpg is
a spectrum display.  Others show the demodulated signal.

Steve NU5D


Barry Sullivan wrote:
> Hi,
>  
> I have a question that some very knowledgeable person may consider
> answering for me.
>  
> That is: "Why do we need to use transceivers with 30KHz band
> requirements when I'm told D-Star only needs 2.7 KHz band width."
>  
> I reason that if only 2.7 KHz is needed then any attempt to move to
> that band width would only need a modulation and limiter adjustment in
> the Tx but new receive filters in the Rx.
>  
> Therefore is there any provision to permit modification of the current
> generation of D-Star radios?
>  
> I think the question is important as there is a current review taking
> place of the 400MHz spectrum usage and we may find ourselves very
> limited in spectrum allocation in that band.
>  
> VK2BZ 
>
>  
>
>     
> ------------------------------------------------------------------------
>
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>   

-- 
A Decibel saved is a Decibel earned.....

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