[BC] The Future

[Larry Bloomfield]

You're a little better than half right. - Vestigial Sideband  :-)

++++++++++++++++++++++++++++++
Larry Bloomfield, KA6UTC
1980 25th St.
Florence, OR 97439
(541) 902-2424 -- Everything
http://www.Tech-Notes.tv
See you on the Taste of
NAB 2007 Road Show



Dana Puopolo wrote:
> Uhm....NTSC TV IS AM!!
>
> -D
>
> ------ Original Message ------
> Received: Sat, 02 Dec 2006 07:36:27 PM EST
> From: Robert Meuser <Robertm at broadcast.net>
> To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
> Subject: Re: [BC] The Future
>
> I agree and have done it with existing technology. My point, however, 
> was combining very tightly spaced AMs with different technology.
>
> R
>
>
> Dana Puopolo wrote:
>
>   
>> The cable industry has been using adjacent channels for decades with zero
>> trouble. They do it by monitoring and adjusting signal stregnths.
>> Co-located FM's can EASILY exist 400 kHz apart with ZERO problems.
>> It's the FCC that's the problem! In their "Alice in Wonderland" world, FM
>> radios haven't improved a bit in 50 years.
>>
>> -D
>>
>>
>> ----- Original Message ------
>> Received: Sat, 02 Dec 2006 11:52:47 AM EST
>> From: "Mark Humphrey" <mark3xy at gmail.com>
>> To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
>> Subject: Re: [BC] The Future
>>
>> On 12/2/06, Robert Meuser <Robertm at broadcast.net> wrote:
>>  
>>
>>     
>>> I think multiplex sites will work with much closer channel spacing
>>> thanks to totally different technology.
>>>    
>>>
>>>       
>> It's already practical to multiplex FM signals at less than 800 kHz
>> spacing by installing two master antenna systems, so that the closest
>> channels can be fed into different combiners, reducing loss while
>> increasing isolation.
>>
>> An example in Germany is the Berlin-Alexanderplatz "Fernsehturm",
>> where stations on 93.1 and 94.3 use the lower "UKW" antenna, with a
>> co-located 93.6 on the upper antenna:
>>
>> http://www.d-no.de/fs-turm.htm
>>
>> Of course, the "space combining" schemes for FM IBOC, using separate
>> antennas for analog and digital, work on the same principle.
>>
>> I manage a tower site in the western suburbs of Philadelphia where the
>> rent is based on the length, diameter, and number of transmission
>> lines, so everyone has an incentive to minimize tower loading.  Some
>> of my tenants who are running trunking systems have come up with some
>> clever combining schemes like this, so they can keep the number of
>> antennas as low as possible.
>>
>> Mark
>>  
>>
>>     
>
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