Forwarding/x-posting from a utility DX group.....
Is this what we're talking about?
Washington - Dec 16, 2010 - <http://www.nabfastroad.org>NAB Fastroad
released <http://www.nabfastroad.org/AMDigitalDataSSSRpt.pdf>a report
on a new AM radio data service concept, with the potential to provide
AM broadcasters the ability to transmit low-rate data similar to what
FM broadcasters can provide using the Radio Data System (RDS)
subcarrier. This work was undertaken by <http://ibiquity.com>iBiquity
Digital and was co-funded by iBiquity and NAB Fastroad.
Called the AM Digital Data Service (ADDS), this new technology
supports delivery of low data-rate text for analog AM radio stations,
which currently have no method for transmitting data such as song
title and artist. This technology could be easily integrated into
future radio receivers.
One of the benefits of this service is that it would offer AM
broadcasters a simpler and less-expensive way to provide a limited
digital service compared to a full AM IBOC installation, which at
present is the only option.
(http://radiomagonline.com/currents/am-radio-concept-developed-1216/)
- DRA
KB2LUM
----------
At 09:50 AM 12/24/2010, you wrote:
>Subject: [Lowfer] Growling audio on MWBC signals
> Date: Wed, 22 Dec 2010 14:31:02 -0700
> From: "C. Turner" <turner@xxxxxxxx>
>
>
>Slightly OT, but interesting nonetheless:
>
>Some weeks ago I happened to tune in our local 69 horsepower (formerly)
>"clear channel" AM radio station (1160 kHz - KSL) and upon listening to
>it in SSB mode using exalted carrier methods, I heard a rather obnoxious
>growling on the audio that disappeared when "normal" AM or synchronous
>AM techniques were employed.
>
>Upon inspecting the carrier, I noted that there was a pair of 16 Hz
>sidebands responsible for the "growling." Curious, I asked the
>engineer, Randy, K7SL - who I happen to know - and here is an excerpt of
>his response:
>
>"16Hz is a low speed data stream used to send messages to warranty
>receivers. These guys are battery operated 10 year lifetime receivers
>that attach themselves to things like Baby Cribs, Saws, etc. These
>receivers set off alarms if a factory recall happens. They then give
>details for the recalls. The data also contains clock correction
>signals for home user clocks. The clocks currently using WWVB don't get
>a good enough signal inside noisy environments and the 50kW signal from
>KSL and other Clear Channel stations cover the the US better.
>
>"Currently the signal ... is just a test signal that repeats itself.
> If [one] looks at night on other strong AM stations [you] will see
>similar signals. There are other uses for the signal, but I don't
>remember them right now. All I know for sure is that it eats up a lot
>of transmitter power. Of course any 1/2 db added to the modulation
>looks like it is stealing all the power when you look only at modulation
>levels around 95 to 100% (chuckle).
>
>"A word of warning. If you walk too closely to one of these receivers,
>it might un-attach itself from where it is and jump to the back of your
>neck and re-attach itself to you. It will then give Aliens control of
>your mind and you know what happens from there. [I saw this on TV so I
>know it is true]"
>
>So there.
>
>I wonder how long it takes before conspiracy-minded people consider this
>to be a means of mind control?
>
>(Never mind... too late!)
>
>73,
>
>Clint
>KA7OEI/CT
>
>
>----------------
>
>
>Jon-FL wrote:
> Below is a messgae you wrote.
> I'll like to share is with the members
> of the IRC channel #WUNclub, and thier e-list (UDXF@xxxxxxxxxxxxxxx).
>
> Any objections?
>
>
>---------------
>
>Hi Jon,
>
>Sure - no problem.
>
>I might add that I've observed the same data on 1040 (WHO) and 1110
>(possibly KFAB) while another on the LF list (Steve R.) also spotted it
>on 850 (KOA).
>
>After receiving his email, I recalled having read something about it in
>the trade rags, but it would be interesting to know the "official" name
>of this service as that would make it a bit easier to research and the
>initial stabs at Google searches haven't turned up anything: I've not
>had the opportunity to ask Randy.
>
>73,
>
>Clint
>-------------------------------------
>
>Jon-FL StarChat IRC Network channels #wunclub and #monitor
>(2x Icom IC-R75, IC-R8500, Racal RA6790/GM, 2x WJ-8716/PRE, Collins
>HF-2050,
>BCD996T, AOR ar-8200-MK3, HAL ST-8000a, M-8000, t2fd, D130NJ discone)
>29 26 53.44 N x 82 38 21.88 W, Bronson, Levy, FL, USA, Sol-3.
>
>
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