Drake DMM806 Television Demodulator - Manual (Page 2)

TV ANTE NN A
OR
C ATV F E E D
AC P OWE R
C OR D
DC P OWE R C AB LE
INS TAL L ATI ON 3 2 F R ONT PANEL DESCRIPTION / REAR PANEL DESCRIPTION
®
SYS TEM OUT
R F C OMB INER
C ONNEC TIONS and C ONTR OL S
All connections to and from the DMM 806 are
made through the rear panel. F igure 3
illustrates the use of the DMM 806 as an off-
air channel processo r. For this purpose, the
feed from a television antenna is connected
via a 75 Ohm coaxial cable to the R F IN
connector of the DMM 806 . The front panel
number is set for 02 through 69 as required.
The VI DEO OUT and AUDIO OUT signals
are connected to the VIDEO IN and AUDIO
IN connectors respecti vely of an adjacently
located Video Modulator, such as a Drake
Mini- rack Video Modulator, operating on the
desired ca ble TV
channel . Alternatively, ca ble TV channels
can be process ed by connecting the 75 Ohm
coaxial cable of a C ATV feed to the DMM 806
R F IN connector and setting the front panel
C/ANT mode to “S”, “H”, or “I”+ 100” and the
recei ved ca ble channel number 02 through
125 as required. Additional channels can be
processed by adding combinations of
DMM 806 units with Drake Mini-rack Video
Modulator units.
R ACK MOUNTING
Adequate ventilation is very important in
multi-channel installations. Units should be
spaced apart by at least one panel height
wherever possi ble, and some air movement
is advisa ble in enclosed rack cabinets.
Excessi ve heat will shorten component life
and system performance will be degraded
without proper cooling.
Figure 3
Illustration of Channel Processing using DMM 806 and a Drake Mini-rack Video Modulator.
DMM 806
DRAKE MINI-R AC K
VIDEO MODUL ATOR
R .L. Drake Holdings LLC
710 Pleasant Valley Drive
Springboro, Ohio 45066
Customer Service and Parts T elephone: +1 (937)746-6990
Fax: +1 (937) 806-1510 www. rldrake.com
Front Panel
All operating controls are located on, or are acces sible from the front panel.
MIDM-806C
S tock No. 7740C
V A
PWR C/ANT
CH CH
LOCK +100
6
9
7
8
5 4
1 2
3
Indicator lights
when in Standby
Channel
Display
Lock
Indicator
1. Video - Adjusts video output level
2. Audio - Adjusts audio output level
3. Channel LE D - Displays ANT or CATV
channel
4. C/ANT Mode B utton - Press button to enter
t he mode sele ction menu. Use the channel
UP/DOWN buttons to sele ct the type of
channel system required as follows:
Press C/ANT button again when sele ction
is completed.
5. Power - ON/OFF push button
6. Channel DOWN - Increments channel by -1
7. Channel UP - Increments channel by +1
8. +100 LE D - When depressed, R E D LE D lights to
indicate channels 100 and higher.
9. Lock - Depressing lock button locks present channel or
mode in memory preventing inadvertent change. A user
must depress the lock channel button again for any
channel/mode changes.
Rear Panel
All the connectors are located the rear panel.
1
3
4
2
1. Video Output - S tandard negative sync video at a 0.5 to 1.5 Vp-p level.
2. Audio Output - Adjustable 0.5 to 1.5 Vpp
3. Power - The polarized power connector accepts +12 VDC, +5 VDC and ground
4. ANT/CATV - R F input from antenna or CATV drop
Display Channel System
S STD (C ATV)
H HRC (C ATV)
I IRC (C ATV)
U Broadcast (TV)
is set for “U” and the received TV channel