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PICList Thread
'Cheap TV3/4 tuners?'
1999\01\26@160752 by John Payson

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Does anyone know of any cheap tuners for television sets (dedicated
channel 3/4 is fine)?  There exist many gizmos for short-range video
transmission, but they all output RF-modulated video only.  I suspect
their design does the audio modulation at the transmitter, and so the
receiving box never has a baseband video signal.  Putting a tuner on
the output, though, should allow the use of the transmit/receive pair
as a relatively high-bandwidth data link.  Does anyone know of any
cheap tuners that would be suitable for such a purpose?

1999\01\26@204301 by WIL REEDER

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Hi John
There are lots of TV converter boxes that have video out and as long as
this is only a onsie for you (not for sale) I'd try the flea markets and
garage sales. I have a Philips unit that seems to be very good quality. Be
sure to look for the video output as some of the cheap ones are just down
converters with no demodulator.
Hope this helps.


Wil Reeder
spam_OUTteachtechTakeThisOuTspambc.sympatico.ca
Vancouver,Canada
Faster horses, younger women, older wiskey, and more money!

----------
| From: John Payson <.....supercatKILLspamspam@spam@CIRCAD.COM>
| To: PICLISTspamKILLspamMITVMA.MIT.EDU
| Subject: Cheap TV3/4 tuners?
| Date: Tuesday, January 26, 1999 1:09 PM
|
| Does anyone know of any cheap tuners for television sets (dedicated
| channel 3/4 is fine)?  There exist many gizmos for short-range video
| transmission, but they all output RF-modulated video only.  I suspect
| their design does the audio modulation at the transmitter, and so the
| receiving box never has a baseband video signal.  Putting a tuner on
| the output, though, should allow the use of the transmit/receive pair
| as a relatively high-bandwidth data link.  Does anyone know of any
| cheap tuners that would be suitable for such a purpose?

1999\01\27@082709 by Andy Kunz

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At 03:09 PM 1/26/99 -0600, you wrote:
>Does anyone know of any cheap tuners for television sets (dedicated
>channel 3/4 is fine)?  There exist many gizmos for short-range video
>transmission, but they all output RF-modulated video only.  I suspect
>their design does the audio modulation at the transmitter, and so the
>receiving box never has a baseband video signal.  Putting a tuner on
>the output, though, should allow the use of the transmit/receive pair
>as a relatively high-bandwidth data link.  Does anyone know of any
>cheap tuners that would be suitable for such a purpose?

Tuners are available from a variety of sources.

If you are looking for 3/4 output, these are usually "down-converters"
rather than "tuners."  The difference is that a down-converter basically
moves a frequency block (often 20MHz or more wide) from it's original
location down to the desired band you want.  You can tell a down-converter
because if you tune to say, channel 3 of its output, you can also see a
(often good) picture on channels 2 and 4.  This has caused me problems,
thinking I had a bug :-(

A tuner, on the other hand, tunes the specified channel, converting it to
IF (then baseband if you have a video out).  If it has channel 3/4 output,
it is then re-modulated to the appropriate frequency.

Both of these are fairly common.  I've worked with Mitsumi, Alps, Philips,
and others.  Many of them use I2C bus interface, many use SPI.  It isn't
hard to find what you are looking for.

I might have one laying around that I can spare.  What are you making?

Andy

  \-----------------/
   \     /---\     /
    \    |   |    /          Andy Kunz
     \   /---\   /           Montana Design
/---------+   +---------\     http://www.montanadesign.com
| /  |----|___|----|  \ |
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                              and keep the wet side down!

1999\01\27@225001 by Norman Gillaspie

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If you are interested in some low cost tuners you can buy a
whole tuner and demod assembly. It has a wealth of useable
modules. I think 35,000 are available.

Go to the following web address

http://www.lasermotion.com/RFCOMPONENTS.htm

Norman Gillaspie

"PC-Sat provides quality Usenet Newshosting and Newsfeeds for ISP and
Corporations. Interested see http://www.pc-sat.com"

> {Original Message removed}

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