[HATS] Using Freq. West Type Microwave Oscillator Sources for 1.2 GHz. ATV Transmitters

[Woody]

Hi All:

Our ATV Assoc. is building our second ATV repeater.  It will be located
about 25 miles from our first ATV repeater.  The two systems will be linked
together full-time by a 2.4 GHz. FM link system.

The original ATV repeater is a normal, in-band, 70 cm system.  This new ATV
repeater will be a split-band system with TX on 421.25 MHz., VSB, and RX on
1.2 and 2.4 GHz. FM.

I am looking for an inexpensive source of 1.2 GHz. FM ATV transmitters.  I
would like to know if anyone has developed an FM modulator that can be used
with the Freq. West type of microwave oscillator sources, which are usually
referred to as "bricks",  for 1.2 GHz. ATV Transmitters.

These units were commonly used as the LOs in microwave transmitters and
receivers in systems built by many different manufacturers, such at Collins,
Cal. Micro, Hughes, and AT&T.  Although made by many different
manufacturers, they are all pretty much the same form factor and basic
design.  I have units with date codes from 1969 to 1990, that are almost
identical.

By using the built-in temperature controlled crystal oscillator to phase
lock the cavity oscillator, you have a very clean and stable, 1.2 GHz. RF
source that puts 1/2 to 3/4 W.  These units usually sell in the $20 to $40
price range.  Add a $15 to $20 crystal, an FM modulator to drive the unit
from a standard NTSC, 1 V signal, and you have a very inexpensive 1.2 GHz.
ATV transmitter.

Back to my original question.  I would like to know if anyone has developed
an FM modulator that can be used with these units.

Happy Holidays.

73,

Woody
KJ4SO


---
Send e-mail to 'listar@stevens.com' with subject:

  'unsubscribe hats'  to unsubscribe from this list
  'subscribe hats'    to subscribe from this list
  'help'              for more information