[JRC] NRD545 question,

[Jan Arkesteijn]

> Actually, I need a definition for Envelope detection and Synchronism
> detection.
>
Hi Chuck
Have a look here
 http://www.tvms.net/Tech_Articles/Synchronous_vs_Envelope_Detection.htm

Hope it helps a little

See you, Jan arkesteijn
http://home.wxs.nl/~jarkest/home.html

----- Original Message ----- 
From: "ChuckB" <ka4prf@us-it.net>
To: "Ben Mesander" <ben@kaosol.net>
Cc: <jrc@mailman.qth.net>
Sent: Thursday, October 09, 2003 11:24 AM
Subject: Re: [JRC] NRD545 question,


> Ben,
>
> The only headway I have made with the TT "AM detection information
> function is that it will work only when the receiver is in AM mode.
> While the receiver is in AM mode, I can send the TT command (AM
> dection status)to the receiver and I can see the response changing
> as I send each request from TT0 to TT1 once in awhile.  As far as
> I can tell, the status changes when the amplitude changes on the
> AM signal.  It if is up there above S9 on the meter, it's TT1 and
> if it's below it comes back TT0.  Sending the commands TT0 or TT1
> to the receiver has no effect.
>
> If anyone has further or different information, please feel free
> to make it known.
>
> Actually, I need a definition for Envelope detection and Synchronism
> detection.
>
> Thanks
>
> Chuck
> ka4prf
> Clewiston Florida
>
> Ben Mesander wrote:
>
> >> I tried changing the detection from envelope to sysnchronism, but
> >> nothing happens.  when I request a status report "TT", I get back
> >> a TT0 which means Envelope Detection.
> >
> >
> > Try using ECSS-USB or LSB mode and see what TT gives back - I think
that's
> > what it is referring to.
> >
> > I may be wrong, but I seem to recall that when receiving faint signals
in
> > ECSS mode, the receiver might switch back and forth between the two
sorts
> > (you might be able to simulate this by turning rf gain down some)
> >
> > Let us know what you find out. I'm interested because I often reduce rf
> > gain to reduce fading in AM recovery modes in the 545. If you turn down
RF
> > gain til the point where the S-meter just stops jumping around, I find
the
> > AM audio gets more intelligable. This is something that could be
> > automatically added to a JRC control program...
> >
> > --Ben
> >
> >
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