[Heath] MDCL

[ChrisIwata]

It seems this scheme is highly dependent on what the modulation is. If 
you're transmitting Rock with very little dynamic range  you probably 
save a lot.  If you're transmitting Classical, you're running full 
carrier a greater percentage of the time.  Voice is probably somewhere 
in between, probably depends on whether you use compression or not.

I'm guessing the programming at WBAP is different than that at KTCK?

Anyway, this MDCL scheme is interesting.  Good info.

Chris

On 5/20/2018 11:48 AM, Bill Guyger via Heath wrote:
> It's kind of interesting to see this discussion. The latest thing in 
> AM broadcasting is MDCL Modulation Dependent Carrier Level. At 0% 
> modulation carrier level is at full power. At 100% modulation carrier 
> is at 50% of full power. It's supposed to save money for high power 
> broadcasters, and does save about $300.00 a month for our 50 KW 
> station WBAP but I haven't noticed all that much of a saving at our 25 
> KW station KTCK so I guess the jury is still out. The process is 
> supposed to be transparent to the listener and it is basically if you 
> live in a strong signal area but it does become apparent in the out 
> laying areas.
>
> The Nautel transmitter at WBAP just required a plug and play external 
> controller to be added. The Harris / GatesAir transmitter at KTCK 
> required replacing one board and adding a second board in the control 
> cabinet plus some rewiring of remote control connections.
>
> Bill AD5OL
>
> On Sunday, May 20, 2018, 8:04:05 AM CDT, Kenneth G. Gordon 
> <kgordon2006 at frontier.com> wrote:
>
>
> On 19 May 2018 at 23:44, jerrylofstead at bellsouth.net 
> <mailto:jerrylofstead at bellsouth.net> wrote:
>
> > Oh yes! Controlled carrier the RF level varies at a voice rate.  DSB 
> SC(supresed carier) was
> > produced by putting two tubes in push-push... usually push pull 
> grids and paralell plates.
>
>
>
>
> vy 73,
>
> Ken W7EKB
>
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