[SBE] Unattended operation

[Jon Frank]

Now I feel like and old timer. In the sixties, and most of the seventies I recall the fail safe time out was three minutes on the control side of things.  I remember a few rushed trips to the transmitter when the remote control circuit was lost.  I believe the loss of metering had a three hour time limit, but no fail safe.

How many of you remember one of the standard FCC field inspection items was the opening of the remote control phone line (normally an unloaded dc pair) by the local inspector.   He would then look at his watch to confirm that the rig dumped within three minutes.  You were cited if it didn't.

Jon Frank
WGBH
Boston

On 6/16/11 12:44 PM, "Edwin Bukont" <ebukont at msn.com> wrote:

Always been 180 min = 3 hrs far as I can recall.

Edwin Bukont CSRE, DRB, CBNT
E2 Technical Services LLC
Tech-Knowledgy for Signal Integrity
Nashville, Baltimore, Whereever
V- 240.417.2475; F- 240.368.1265









________________________________
From: DanRapak at verizon.net
To: sbe at sbe.org
Date: Thu, 16 Jun 2011 12:23:46 -0400
Subject: Re: [SBE] Unattended operation

Was this time limit always 3 hours? I'm trying to recall what the "fail-safe" timeout was on our remote controlled transmitter was when I worked in local television in the late 1970's.

Dan Rapak

----- Original Message -----
From: Benedict, Raymond C <mailto:rcbenedict at cbs.com>
To: sbe at sbe.org
Sent: Thursday, June 16, 2011 11:21 AM
Subject: [SBE] Unattended operation

There are three modes of operation, Attended, Automatic Transmission, and Unattended.  Many times ATS is mixed with unattended but they are different modes of operation.

So from 73.1300, Unattended is:

"or unattended (where highly stable equipment OR automated monitoring of station operating parameters is employed). No prior FCC approval is required to operate a station in the unattended mode."
Note the "or" between highly stable and automated monitoring.
Note there is not any requirement for automatic shutdown if the system goes out of tolerance. So if it's highly stable it won't go out of tolerance will it???
73.1350 (d) does require shutdown after  3 hours of ANY broadcast transmitter if certain conditions are exceeded,  examples given are EXCESSIVE power, EXCESSIVE modulation, or spurious signals. Which basically  means if it is causing interference to others, turn it down or off.
Common sense,  yeah, best to have some way of remotely turning it off it sounds crazy on the air.
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