[opendtv] Re: ATSC Test system - cheap

Can you tell us what an "edge" issue is? I've been toying
with the idea of using one is these modulators for amateur
radio DTV experiments in the 420-450 MHz band (the
vogue is to use cable channel 58 at 427.25 MHz, so that
a cable ready TV can be used as a receiver).

For amateur applications, spectral purity, bandwidth and
stability are not strictly regulated. Basically, you just have
to keep your modulation sidebands within the 420 to 450
MHz band.

Ron

John Willkie wrote:

>be warned:  while the 8-VSB modulator works well -- I've known people who
>have used them extensively for testing and cable uses -- it is not stable
>enough for broadcast use.  IIRC, that's because of 'edge' issues.
>
>John Willkie
>----- Original Message ----- 
>From: "Ron Economos" <k6mpg@xxxxxxxxxxx>
>To: <opendtv@xxxxxxxxxxxxx>
>Sent: Friday, July 22, 2005 2:17 PM
>Subject: [opendtv] Re: ATSC Test system - cheap
>
>
>  
>
>>http://www.computermodules.com/broadcast/rf-8VSB-modulator-QPSK-Quam.shtml
>>
>>
>>    
>>
>http://www.computermodules.com/broadcast-systems/professional-8VSB-modulator.shtml
>  
>
>>Ron
>>
>>Craig Birkmaier wrote:
>>
>>    
>>
>>>I have received a message from a friend of a friend who needs help
>>>generating ATSC test streams to test various ATSC "decoders"
>>>(receivers). Here is the request:
>>>
>>>
>>>
>>>      
>>>
>>>>   This is a bit of a reverse from the normal situation, but I
>>>>hoped some folks here might have some ideas.
>>>>
>>>>   I'm looking for ways to easily test and compare ATSC decoders.
>>>>I'm looking for a PCI card or something that can take a local
>>>>ATSC-compatible .ts file, and mux it and sent it out over coax, to
>>>>which I can attach a normal ATSC decoder, which would see it like it
>>>>was an antenna. Just like how VCRs used to work - RF out over coax,
>>>>pretending to be channel 3 or 4.
>>>>
>>>>   I've seen some very high end systems that do a huge amount of
>>>>stuff I don't care about. I'm looking for something simple and
>>>>inexpensive - hopefully cheap enough that the company would actually
>>>>publish the price :).
>>>>
>>>>
>>>>        
>>>>
>>>I remember a recent story about a PC card that may be able to do
>>>this. Does anyone know the specifics, or any other way to do this?
>>>
>>>Regards
>>>Craig
>>>      
>>>

 
 
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:

- Using the UNSUBSCRIBE command in your user configuration settings at 
FreeLists.org 

- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word 
unsubscribe in the subject line.

Other related posts: