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Re: Occasional "burps" on U4K?
To: CRTech <crtech@crtech.org>
Subject: Re: Occasional "burps" on U4K?
From: Willie Barnett <wbradiolists@gmail.com>
Date: Wed, 21 Feb 2018 10:45:15 -0500
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The red light is the "Warning" loss of signal (or lock) indicator. I do know that the EbNo isn't "realtime", but whatever the glitches are, they do reflect as a brief drop in that calculation of about 1dB a few seconds later.

You're right... the U4K's are getting on in years... it looks like it's brand new, but looks are deceiving. ;)

I'll be checking things out.

Thanks for the tips, everyone. :)


On Mon, Feb 19, 2018 at 6:28 PM, Michael Barnes <barnmichael@gmail.com> wrote:
Also, remember that Eb/No is a calculation of several values over time and runs a bit behind actual events. Transient events will not be reflected in any Eb/No reading. As I haven't seen a U4K in almost two years, I don't remember specifically what the red LED is for, but I suspect it might be indicating a brief unlock in decoding the data stream. This could be caused by an RF disruption or something failing in the receiver. Considering the age of the U4K (~20 years?) there could be any number of possibilities. Might I suggest starting to look for a Unity 4600 or newer receiver?

References: Occasional "burps" on U4K?
(Willie Barnett <wbradiolists@gmail.com>, 19 Feb 2018 18:12:19 -0000)
RE: Occasional "burps" on U4K?
("Allard, Mark G" <MGAllard@unwsp.edu>, 19 Feb 2018 18:32:41 -0000)
Re: Occasional "burps" on U4K?
(Willie Barnett <wbradiolists@gmail.com>, 19 Feb 2018 19:23:38 -0000)
Re: Occasional "burps" on U4K?
(Sherrod Munday <smunday@ieee.org>, 19 Feb 2018 20:36:12 -0000)
Re: Occasional "burps" on U4K?
(Michael Barnes <barnmichael@gmail.com>, 19 Feb 2018 23:28:11 -0000)
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