[BC] BC] Some Input Needed Re: CBS 400, Mosely TFL-280
KGDNFM1013
kgdn
Tue May 10 20:57:14 CDT 2005
Gates BC-5P - One with a power supply for a 10 KW transmitter on the
Modulator side is what led the FCC to put the 125% limit on positive
modulation. REEALLY LOUD!
-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of DANA PUOPOLO
Sent: Tuesday, May 10, 2005 5:33 PM
To: Broadcast Radio Mailing List
Subject: Re: [BC] BC] Some Input Needed Re: CBS 400, Mosely TFL-280
If I recall that Gates rig also had two power supplies - one for RF and
one for the modulator.
That sucker was LOUD! I remember that top 40 WPRO in Providence, RI had
one for it main transmitter. Their 5 kW non d signal at 630 used to be
louder in the Boston suburbs than most of the Boston stations.
-D
------ Original Message ------
Received: Tue, 10 May 2005 04:17:27 PM PDT
From: "Phil Alexander" <dynotherm at earthlink.net>
To: Broadcast Radio Mailing List <broadcast at radiolists.net>
Subject: Re: [BC] BC] Some Input Needed Re: CBS 400, Mosely TFL-280
On 10 May 2005 at 12:16, Scott Bailey wrote:
> Bear in mind, those boxes were built before the early 80's
> term "Super Modulation" came about. This is were the Commission
> made it legal for AM's to do 125% positive modulation.
Just for the sake of accuracy, the FCC didn't start "allowing" it. What
they did was make a rule to put on a limit because many had
been hitting 150-175% positive since the late 60's. Previously, there
was no rule that prevented anything except exceeding -100% negative
modulation and required at least 80 or 85% (can't recall
which) positive.
In the late 60's Gates made a "special" version of the BC-5P2
with the 10 kW modulator section of a BC-10P in it. Anyone want
to guess why? <ggg>
Phil Alexander, CSRE
Broadcast Engineering Services and Technology
(a Div. of Advanced Parts Corporation)
Ph. (317) 335-2065 FAX (317) 335-9037
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.11.8 - Release Date: 5/10/05
_______________________________________________
This is the BROADCAST mailing list
To send to the list, email: broadcast at radiolists.net
For sub changes, archives and info on this other lists:
http://www.radiolists.net/
_______________________________________________
This is the BROADCAST mailing list
To send to the list, email: broadcast at radiolists.net
For sub changes, archives and info on this other lists:
http://www.radiolists.net/
More information about the Broadcast
mailing list