-----Original Message-----
From: fcembrola <fcembrola@BTINTERNET.COM>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: ŽŒ’ ¿‡Ž˜Ž, ŽŒÝŽ 03, 1998 08:50
Subject: Help with Digital Modulator


>Hello picsters!
>
>My project involves using a PIC 16C84 to
>control a UHF digitally programmable
>modulator. It uses the I2C BUS to program its
>modulated frequency.
>
>The modulator in question has 8 pins labelled
>as follows:
>
>1 - SCL (this is the serial clock)
>2 - SDA (the serial data)
>3 - VT
>4 - Video in
>5 - Audio in
>6 - +5v
>7 - GND
>8 - Boost
>
>I can understand, and know how to use all the
>functions of the pins except for
>pin 3 (VT). I have no idea what it is
>supposed to do and how to use it. I would
>appreciate any help or any hint where I can
>get the right info.
>
>The modulator part number is RMBT-UK36L
>
>Francesco Cembrola
>
I think the VT is V tune , this goes to the v v c  (voltag variable cap)
diode to tune the frequency of the modulator.
on TV tuners this voltag is 33v and is very stable.


Meir Mark.