Topband: BAD OT:Phase noise *** RE: digital on 1838 +/-

[Jeff Blaine]

Greg,

Yes, that's correct.  Thanks for the fix.  Been a long week.

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: Greg - ZL3IX
Sent: Saturday, December 31, 2011 1:29 AM
To: topband at contesting.com
Subject: Re: Topband: BAD OT:Phase noise *** RE: digital on 1838 +/-

Jeff, I suspect that you mean modern day synthesisers rather than
specifically DDS.  Actually, the DDS itself has quite low phase noise,
better than -130 dBc/Hz with Analog Devices chips,  especially if the
internal multiplying PLL is not used in the reference path.

73, Greg. ZL3IX

On 2011-12-31 06:30 p.m., Jeff Blaine wrote:
> Phase noise is generated by the rig's LO and exists as a more broad band 
> low
> level signal.  Issue is more significant with modern day DDS than with 
> older
> analog-type VFO sources.  Guys who operate field day can relate...
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
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