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
-----Original Message-----
From: MIKE DURKIN
Sent: Friday, December 30, 2011 11:08 PM
To: topband@contesting.com
Subject: Topband: BAD OT:Phase noise *** RE: digital on 1838 +/-
Don't you mean IMD from the radio/amp driven past ALC?
CW is a binary signal and no one complains of its "phase noise" .....
Mike KC7NOA
> From: n4is@comcast.net
> To: wa3mej@comcast.net; topband@contesting.com
> Date: Fri, 30 Dec 2011 22:59:09 -0500
> Subject: Re: Topband: digital on 1838 +/-
>
>
>
> -----Original Message-----
> From: topband-bounces@contesting.com
> [mailto:topband-bounces@contesting.com] On Behalf Of wa3mej@comcast.net
> Sent: Friday, December 30, 2011 10:47 PM
> To: topband@contesting.com
> Subject: Re: Topband: digital on 1838 +/-
>
>
> Jim
>
> >>>Consider this however, CW and digital modes like JT65 typically share
> >>>the CW portion of the bands<<<.
>
> That is not the case on weak signal bands, and in special 6m, digital
> modes are above 50.250 MHz, there is a clear reason for that, digital is
> not a narrow mode, there are phase noises that can trash the band.
>
>
> Regards
> Jose Carlos
> N4IS
>
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
|