The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert you
to the presence of uninsulated
“dangerous voltage” within the
product’s enclosure that may be
of sufficient magnitude to constitute a risk of electrical shock to
persons.
TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER FROM THIS UNIT.
NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE
This reminder is provided to call the CATV System Installer’s attention to Article 820-40 of the NEC that
provides guidelines for proper grounding and, in particular, specifies that the cable ground shall be
connected to the grounding system of the building, as close to the point of cable entry as practical.
Safety Instructions
The exclamation point within an
! CAUTION !
RISK OF ELECTRIC SHOCK
DO NOT OPEN
equilateral triangle is intended
to alert you to the presence of
important operating and maintenance (servicing) instructions
in the literature accompanying
the product.
NOTE TO CATV SYSTEM INSTALLER
WARNING
You should always follow these instructions to help ensure against injury to yourself and
damage to your equipment.
å Read all safety and operating instructions before you operate the modulator.
å Retain all safety and operating instructions for future reference.
å Heed all warnings on the modulator and in the safety and operating instructions.
å Follow all installation, operating, and use instructions.
å Unplug the modulator from the AC power outlet before cleaning. Use only a damp cloth for cleaning the exterior of
the modulator.
å Do not use accessories or attachments not recommended by Blonder Tongue, as they may cause hazards, and will
void the warranty.
å Do not operate the modulator in high-humidity areas, or expose it to water or moisture.
å Do not place the modulator on an unstable cart, stand, tripod, bracket, or table. The modulator may fall, causing
serious personal injury and damage to the modulator. Install the modulator only in a mounting rack designed for 19”
rack-mounted equipment.
å Do not block or cover slots and openings in the modulator. These are provided for ventilation and protection from
overheating. Never place the modulator near or over a radiator or heat register. Do not place the modulator in an
enclosure such as a cabinet without proper ventilation. Do not mount equipment in the rack space directly above or
below the modulator.
å Operate the modulator using only the type of power source indicated on the marking label. Unplug the modulator
power cord by gripping the plug, not the cord.
Page 3
Instruction Manual
Satellite Dish
Coaxial Cable
from Satellite Dish
Electric Service
Equipment
Power Service
Grounding
Electrode System
(NEC Art. 250, Part H)
Ground Clamps
Grounding Conductors
(NEC Section 810-21)
Antenna Discharge Unit
(NEC Section 810-20)
Ground Clamp
Safety Instructions - continued
å The modulator is equipped with a three-wire ground-type plug. This plug will fit only into a ground-type power
outlet. If you are unable to insert the plug into the outlet, contact an electrician to replace the outlet. Do not defeat
the safety purpose of the ground-type plug.
å Route power supply cords so that they are not likely to be walked on or pinched by items placed upon or against
them. Pay particular attention to cords at plugs, convenience receptacles, and the point where they exit from the
unit.
å Be sure that the outdoor components of the antenna system are grounded in accordance with local, federal, and National
Electrical Code (NEC) requirements. Pay special attention to NEC Sections 810 and 820.
See the example shown in the following diagram:
3DHDP
å We strongly recommend using an outlet that contains surge suppression or ground fault protection. For added
protection during a lightning storm, or when the modulator is left unattended and unused for long periods of time,
unplug it from the wall outlet and disconnect the lines between the modulator and the antenna. This will prevent
damage caused by lightning or power line surges.
å Do not locate the antenna near overhead power lines or other electric light or power circuits, or where it can fall into
such power lines or circuits. When installing the antenna, take extreme care to avoid touching such power lines or
circuits, as contact with them can be fatal.
å Do not overload wall outlets or extension cords, as this can result in a risk of fire or electrical shock.
å Never insert objects of any kind into the modulator through openings, as the objects may touch dangerous voltage
points or short out parts. This could cause fire or electrical shock.
å Do not attempt to service the modulator yourself, as opening or removing covers may expose you to dangerous
voltage and will void the warranty. Refer all servicing to authorized service personnel.
å Unplug the modulator from the wall outlet and refer servicing to authorized service personnel whenever the following
occurs:
o The power supply cord or plug is damaged;
o Liquid has been spilled, or objects have fallen into the modulator;
o The modulator has been exposed to rain or water;
o The modulator has been dropped or the chassis has been damaged;
o The modulator exhibits a distinct change in performance.
å When replacement parts are required, ensure that the service technician uses replacement parts specified by Blonder
Tongue. Unauthorized substitutions may damage the modulator or cause electrical shock or fire, and will void the
warranty.
å Upon completion of any service or repair to the modulator, ask the service technician to perform safety checks to
ensure that the modulator is in proper operating condition.
Page 4
4
CH
ENTER
BLONDER
TONGUE
3
2
DHDC -DV
UP
DN
CHANNEL
1
ENTER
BLONDER
TONGUE
+100
DHDC -UV
8
RF LEVEL
DN
UP
UP
DN
4
5
6
7
CH
ENTER
BLONDER
TONGUE
+100
DHDC-UH
DIGITAL HDTV
UP CONVERTER
RF LEVEL
DN
UP DN
7
CHANNEL
UP
6
5
8
4
IF
RF
POWER
9
12
11
IF
RF
POWER
10
13
11
3
1
DHDP
Instruction Manual
Description
The DHDP Series consists of 2 parts, the DHDC-D (Downconverter) and the DHDC-U (Upconverter). The units are
intended to operate as a system in order to process digital & high definition television (HDTV) signals.
Operating Controls and Indicators
Front Panel
1. 2-Digit LED Display — 2 digit LED Channel display
2. Up/Down Channel Buttons — Up & down push button controls for setting the channel.
3. Enter Button - Button used to enter the displayed channel into memory.
4. Up/Down RF Level Buttons — Up & down push button controls for RF level.
5. Up/Down Channel Buttons — Up & down push button controls for channel and mode adjustment.
6. 2-Digit LED Display — 2 digit LED display for Channel, mode and RF level information.
7. Enter Button — Button used to “enter” channel, mode or RF level selection into memory.
8. +100 Channel LED Indicator — LED illuminates to indicate CATV channels 100 to 135.
Front Panel Views
DHDC-DV
DHDC-UV
Rear Panel
9. IF Output - “F” Connector
10. IF Input - “F” Connector
11. Power Connector
12. RF Input - “F” Connector
13. RF Output - “F” Connector
Specifications
DHDC-D Down Converter
Input Tuning Range (Off-Air 8VSB) (54-216, 470-864 MHz)
(any undesired channel < +25 dBmV)
Max undesired to desired channel ratio: < +25 dBc
Max adjacent to desired channel ratio: < +15 dBc
IF Output Level Digital: +30 dBmV*
Rejection of Adjacent Analog Channels: -70 dB Typical
Power Requirements:
110 mA @ +12 VDC, 370 mA @ +5 VDC
DHDC-UH
DHDC-DH
2
BLONDER
TONGUE
DHDC-DH
DIGITAL HDTV
DOWN CONVERTER
CHANNEL
UP
DN
ENTER
Rear Panel Views
DHDC-DV/DH
DHDC-UV/UH
DHDC-U Up Converter
IF Input Level: +30 dBmV
Output Frequency Range:
Standard CATV, IRC, HRC & Broadcast 54-864 MHz
RF Output Level Digital: +45 dBmV*
Display Error: ±2 dB
Output Level Adjustment Range: +35 to +45 dBmV
Spurious Output (54-864 MHz): -60 dBc
Phase Noise @ 10 kHz Offset: -95 dBc/Hz
Broadband Noise, Out of Channel: -70 dBc (5.5 MHz BW)
Power Requirement:
310 mA @ +12 VDC, 320 mA @ +5 VDC
* Average Measurement
Page 5
Instruction Manual
Setting Up the Units
1. Place each of the units into the appropriate Blonder Tongue Micromodular chassis by sliding the unit into the
retaining rails.
a. It is recommended to physically place one Downconverter and one Upconverter next to one
another in the chassis.
2. Connect the digital or HDTV signal (8VSB format) to the RF ‘F’ connector on the DHDC-D unit.
3. Connect the IF ‘F’ connector of the DHDC-D to the IF ‘F’ connector of the DHDC-U.
4. Connect the RF ‘F’ connector of the DHDC-U to the appropriate combining device.
5. Connect each unit to the power supply using one of the power supply cables.
Programming the Unit
The DHDC-D unit is intended to accept any digital UHF or VHF signal and convert it to IF. The DHDC-U unit is intended to
accept any digital IF signal and process it to any channel from 54-864 MHz. The unit has 4 valid operating modes, STD CATV,
IRC, HRC & Broadcast UHF/VHF. It comes factory set to operate in Standard CATV Mode. If you wish to change the operating
mode skip to the Operating Mode Selection section.
5DHDP
Programming the DHDC-D
1. Navigate to the desired channel number by depressing the CH p UP and q DN buttons.
a. Press and hold the CH p UP or q DN arrow button for fast scrolling.
2. Press the ENTER button when you reach the desired channel setting. This will tune the downconverter input to the
corresponding frequency for this entry.
a. The LED display will blink continuously during the channel programming process and will not change the channel
until the ENTER button is depressed.
b. The unit has a special feature that alerts an operator of an inadvertent or desired change to the unit by flashing
LED readout. The LED will continue to flash for 30 seconds if the ENTER button is not depressed and if no additional
entries are made then the readout will return to the display of the previously programmed channel entry setting.
Programming the DHDC-U
The DHDC-U unit comes factory set to operate in the Standard CATV mode. The unit has 4 valid operating modes:
STD, CATV, IRC, HRC & Broadcast UHF/VHF (see the operating mode selection section for programming information).
Programming a Channel
1. Navigate to the desired channel number by depressing the CH p UP and q DN buttons.
a. Continue past 99 for channels 100-135, the +100 LED will illuminate.
b. Press and hold the CH p UP or q DN arrow button for fast scrolling.
2. Press the ENTER button when you reach the desired channel setting. This will tune the upconverter output to the
corresponding frequency for this entry.
a. The LED display will blink continuously during the channel programming process and will not change the output
channel until the ENTER button is depressed.
b. The unit has a special feature that alerts an operator of an inadvertent or desired change to the unit by flashing
LED readout. The LED will continue to flash for 30 seconds if the ENTER button is not depressed and if no additional
entries are made then the readout will return to the display of the previously programmed channel entry setting.
Page 6
6
DHDP
Instruction Manual
Programming the DHDC-U (Continued)
Programming RF Level
1. Depress the RF Level p UP or q DN buttons to increment or decrement the RF output level to the desired setting.
a. The unit has a specified adjustment range of +35 dBmV to +45 dBmV output. The unit software however, will permit
entries from +33 to +47 dBmV, the out of range entries of 33-34 & 46-47 dBmV are meant for usage to correct any display
error, allowing the unit to be operated in the specified range.
ATTENTION!
It is also recommended to set the output level to +45 dBmV for optimum noise performance
and externally attenuate down to a desired level.
2. Press the ENTER button when you reach the desired RF Level setting. This will tune the upconverter output to the
corresponding level entry.
a. The LED display readout will also flash continuously during the RF Level programming process. The LED display will
continue to flash for 30 seconds if the ENTER button is not depressed and then will return to the display of the previously
programmed channel entry setting.
Operating Mode Selection
The unit has 4 valid operating modes: STD CATV, IRC, HRC & Broadcast UHF/VHF.
The DHDC-U unit comes factory set to operate in the Standard CATV mode.
To change the operating mode
1. Simultaneously depress the RF Level p UP and q DN buttons for approximately 5 seconds.
2. The Channel LED display will switch to the operating mode selection.
3. Use the RF Level p UP and q DN buttons to select the desired mode:
a. C = STD CATV
b. H = HRC
c. I = IRC
d. U = Broadcast (VHF/UHF)
4. After selecting the desired mode depress the ENTER button to set the mode.
5. The unit will return to the channel display mode.
a. Programming will reflect the mode chosen – See Appendix for detailed frequency plans.
b. The operating mode will also flash continuously during the mode selection process. The LED display will
continue to flash for 30 seconds if the ENTER button is not depressed and then will return to the display of
the previously programmed channel & mode entry setting. NOTE: THE MODE PRESENTLY IN MEMORY WILL BE
DISPLAYED WITHOUT FLASHING DURING THE MODE SELECTION PROCESS.
Trouble Shooting
A continuously flashing Channel Display indicates an Error
Condition detected by the unit microcontroller.
Sample conditions include:
• Channel Selector Entry does not match the channel
number on which the unit is operating, the display
will flash for 30 seconds and then revert back to the
previous CH entry
• E1 is displayed if the Input VCO is Not Locked
• E2 is displayed if the Output VCO is Not Locked
Correction Suggestion
The User should perform the following steps to correct an
Error Condition:
1. Check that the Channel Display is set to the desired
channel & reset as appropriate.
2. Check that the unit is set to the appropriate desired
operating mode.
3. Verify the unit output on a spectrum analyzer.
4. Disconnect and reconnect power to the unit.
If an error condition continues to be displayed, unit should be
replaced and serviced.
Blonder Tongue Laboratories, Inc. (BT) will at its sole option, either repair or replace (with a new or factory reconditioned product, as BT may
determine) any product manufactured by BT which proves to be defective in materials or workmanship or fails to meet the specifications which
are in effect on the date of shipment or such other specifications as may have been expressly agreed upon in writing (i) for a period of one (1)
year from the date of original purchase (or such shorter period of time as may be set forth in the license agreement specific to the particular
software being licensed), with respect to iCentral™ (hardware and software) and all other software products (including embedded software)
licensed from BT, (ii)) for a period of one (1) year from the date of original purchase, with respect to all MegaPort, IPTV products and fiber
optics receivers, transmitters, couplers and integrated receivers/distribution amplifiers (including TRAILBLAZER™, RETRO-LINX™ and TWIN
STAR™ products) as well as for VideoCipher® & DigiCipher® satellite receivers, and (iii) for a period of three (3) years from the date of original
purchase, with respect to all other BT products. Notwithstanding the foregoing, in some cases, the warranty on certain proprietary sub-assembly
modules manufactured by third party vendors and contained in BT products and on certain private-label products manufactured by third parties
for resale by BT are of shorter duration or otherwise more limited than the standard BT limited warranty. In such cases, BT’s warranty with
respect to such third party proprietary sub-assembly modules and private-label products will be limited to the duration and other terms of such
third party vendor’s warranty. In addition, certain products, that are not manufactured but are resold by BT, carry the original OEM warranty for
that product. The limited warranty set forth in this paragraph does not apply to any product sold by BT, which at the time of sale constituted a
Closeout Product.
BT will at its sole option, either repair or replace (with a new or factory reconditioned product, as BT may determine) any product sold by
BT which at the time of sale constituted a refurbished or closeout items (“Refurbished Product” and “Closeout Product”), which proves to be
defective in materials or workmanship or fails to meet the specifications which are in effect on the date of shipment or such other specifications
as may have been expressly agreed upon in writing, for a period of ninety (90) days from the date of original purchase. Notwithstanding the
foregoing, in some cases, the warranty on third party software and on certain proprietary sub-assembly modules manufactured by third party
vendors and contained in BT products and on certain private-label products manufactured by third parties for resale by BT are of shorter
duration or otherwise more limited than the BT limited warranty for Closeout Products. In such cases, BT’s warranty for Closeout Products
constituting such third party software, third party proprietary sub-assembly modules and private-label products will be limited to the duration
and other terms of such third party vendor’s warranty. In addition, notwithstanding the foregoing, (i) certain Closeout Products that are not
manufactured (but are resold) by BT, carry the original OEM warranty for such products, which may be longer or shorter than the BT limited
warranty for Refurbished or Closeout Products. All sales of Refurbished or Closeout Products are final.
To obtain service under this warranty, the defective product, together with a copy of the sales receipt or other satisfactory proof of purchase
and a brief description of the defect, must be shipped freight prepaid to: Blonder Tongue Laboratories, Inc., One Jake Brown Road, Old Bridge,
New Jersey 08857.
This warranty does not cover damage resulting from (i) use or installation other than in strict accordance with manufacturer’s written instructions,
(ii) disassembly or repair by someone other than the manufacturer or a manufacturer-authorized repair center, (iii) misuse, misapplication or
abuse, (iv) alteration, (v) lack of reasonable care or (vi) wind, ice, snow, rain, lightning, or any other weather conditions or acts of God.
OTHER THAN THE WARRANTIES SET FORTH ABOVE, BT MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF
ANY KIND, EXPRESS OR IMPLIED, AS TO THE CONDITION, DESCRIPTION, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY OR AS TO ANY OTHER MATTER, AND SUCH WARRANTIES SUPERSEDE ANY ORAL OR WRITTEN WARRANTIES OR REPRESENTATIONS MADE OR IMPLIED BY BT OR BY ANY OF BT’S EMPLOYEES OR REPRESENTATIVES, OR
IN ANY OF BT’S BROCHURES, MANUALS, CATALOGS, LITERATURE OR OTHER MATERIALS. IN ALL CASES, BUYER’S SOLE
AND EXCLUSIVE REMEDY AND BT’S SOLE OBLIGATION FOR ANY BREACH OF THE WARRANTIES CONTAINED HEREIN
SHALL BE LIMITED TO THE REPAIR OR REPLACEMENT OF THE DEFECTIVE PRODUCT F.O.B. SHIPPING POINT, AS BT IN
ITS SOLE DISCRETION SHALL DETERMINE. BT SHALL IN NO EVENT AND UNDER NO CIRCUMSTANCES BE LIABLE OR
RESPONSIBLE FOR ANY CONSEQUENTIAL, INDIRECT, INCIDENTAL, PUNITIVE, DIRECT OR SPECIAL DAMAGES BASED
UPON BREACH OF WARRANTY, BREACH OF CONTRACT, NEGLIGENCE, STRICT TORT LIABILITY OR OTHERWISE OR ANY
OTHER LEGAL THEORY ARISING DIRECTLY OR INDIRECTLY FROM THE SALE, USE, INSTALLATION OR FAILURE OF ANY
PRODUCT ACQUIRED BY BUYER FROM BT.
All claims for shortages, defects and non-conforming goods must be made by Buyer in writing within five (5) days of receipt of merchandise,
which writing shall state with particularity all material facts, concerning the claim then known to Buyer. Upon any such complaint, Buyer shall
hold the goods complained of intact and duly protected, for a period of up to sixty (60) days. Upon the request of BT, Buyer shall ship such
allegedly nonconforming or defective goods, freight prepaid to BT for examination by BT’s inspection department and verification of the defect.
BT, at its option, will either repair, replace or issue a credit for products determined to be defective. BT’s liability and responsibility for defective
products is specifically limited to the defective item or to credit towards the original billing. All such replacements by BT shall be made free
of charge f.o.b. the delivery point called for in the original order. Products for which replacement has been made under the provisions of this
clause shall become the property of BT. Under no circumstances are products to be returned to BT without BT’s prior written authorization. BT
reserves the right to scrap any unauthorized returns on a no-credit basis. Any actions for breach of this contract must be commenced by Buyer
within thirteen (13) months after the cause of action has accrued. A copy of BT’s standard terms and conditions of sale, including the limited
warranty, is available from BT upon request. Copies of the limited warranties covering third party proprietary sub-assembly modules and private
label products manufactured by third parties are also available from BT on request. VideoCipher® & DigiCipher® are registered trademarks of
Motorola Corp.