[HATS] Looking for some help/advice with a 900Mhz FM-ATV project/idea I have.

[Jacob Tennant]

I was talking about 900Mhz FM-ATV
  -----Original Message-----
  From: TOMSMB@aol.com [mailto:TOMSMB@aol.com]
  Sent: Friday, October 03, 2003 4:45 PM
  To: spark51@attglobal.net; k8jwt@adelphia.net; hats@stevens.com
  Subject: Re: [HATS] Looking for some help/advice with a 900Mhz FM-ATV
project/idea I have.



  In a message dated 10/3/03 1:15:46 PM, spark51@attglobal.net writes:



    Also, since the audio subcarrier is down several dB from the video, the
    audio output power requirements are lower than those for the video.  I
seem
    to remember about a four to one ratio -- but check it out before doing
any
    serious design.



  For separate transmitters the level is -7 to -10 dB as radiated from the
site in the same direction.  A mix system is -15 to -18.  So this is why a
separate TX in an AM ATV system goes so much farther.  You can still get
some lower sideband sound transmitted even with a separate upper sound
transmitter depending on the amount of sound transmitter energy gets picked
up by the video tx antenna and mixes in the final amp to be re-radiated -
intermod.



  Tom O'Hara W6ORG
  P. C. Electronics
  www.hamtv.com
  626-447-4565 m-th 8 AM to 5:30 PM

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