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Allen Avionics Products |
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Which type is right for your application -
Hum vs. Noise…
What’s the Difference? Simply stated, for video application there is none. Hum eliminators and video noise eliminators only remove unwanted 50Hz. and 60Hz. signals from video cables.
HEC Series - Broadcast Quality - 1 to 5 channels
…work best in those circumstances where interference is caused by small differences in ground potential (less than 20 volts) or by induced currents in long cable runs. When there are multiple power panels in a building, or even on a single floor, equipment and lighting loads result in small differences in potential which induce ground loop current flow and 60Hz. hum.
Electromagnetically-induced currents in long cable runs also create hum. For 50Hz. and 60Hz. power systems, and where induced currents are high, the HEC-2000 and HEC-2000H increase the attenuation at the power frequency.
Should a small amount of hum remain after an HEC has been added to the circuit, a second HEC can be added in series, without significant degradation of the video signal.
VNE Series - Noise Eliminators for High Definition TV & Other High Frequency Bandwidth Applications
…are effective for video signals up to 30MHz---encompassing HDTV frequencies--- with little distortion. For signals below 20MHz, they are totally “transparent.” Since hum reduction, using VNEs, is not as great as with HECs, their use is recommended only where higher frequencies are involved.
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Features
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Flat Response |
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Bandwidths up to 30MHz |
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No Low or High Frequency Roll-Off |
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No Differential Gain or Phase Distortion |
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Rugged, Waterproof Case |
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BNC Connectors |
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Passive Device - Failure Free |
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For Color and Black & White |
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Reversible |
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Small, Compact Package |
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Applications
 Field |
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Between Remote Truck, Telco & Microwave |
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For Intertruck Hookup |
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For VTR Units |
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For Monitoring Lines |
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 Studio
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Between Buildings |
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On Long Runs in Buildings |
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Between Studios & Transmitters |
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On Incoming & Outgoing Telco Circuits |
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| Product Type |
Details |
Series Designation |
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Model HD-SDI Ground Loop Eliminator |
SDI and HD-SDI Hum Eliminators
Stop potential hum interference with HD Serial Digital (HD SDI SMPTE 292M) |
SDI / HD-SDI |
Printable pdf file |
| Video Hum Eliminators |
Single Channel, Multi-Channel, NTSC, RGB |
HEC - 500, 1000, 2000
HEC - 3000, 4000, 5000 |
printer friendly datasheet
HEC-500 thru 4000
HEC-2000
HEC-5000 |
| Wide Bandwidth RGB Hum Eliminators |
1 and 5 Channels
Bandwidth: 200 - 500 MHz, min. |
GLE Series
50 and 75 Ohm Impedance |
printer friendly
datasheet p1 p2 |
| Video Noise Eliminators |
Single and Multi Channel |
VNE-75
VNE-75-3 |
printer friendly
datasheet |
| S-Video Hum Eliminator & Ground Loop Isolation Transformer |
 for use with S-Video, SVHS, HI-8 and other Y/C Video formats
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SVIT-75-H Isolation Transformer
SV-1000-H Hum Eliminator |
printer friendly
datasheet p1 p2 |
Rack Mounting
for Hum & Noise Eliminators |
Racks and Mounting Cards |
RMC and RMC-2 |
printer friendly
datasheet |
Wide Bandwidth Ground Loop Eliminators
(Supports SDI transmission (SMPTE 259M). |
High degree of common mode rejection at power frequencies (50Hz, 60Hz and 400Hz) while passing all frequencies from DC to over 300 MHz for the GLE-50 and GLE-75 and DC to over 500MHz |
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| Impedance (Ohms) |
50 Ohms
Unbalanced |
75 Ohms
Unbalanced |
75 Ohms
Unbalanced |
75 Ohms
Unbalanced |
| Bandwidth |
DC to 30 MHz.
0.61 dB @ 10MHz.
1.00 dB @ 20MHz.
1.25 dB @ 30 MHz. |
DC to 30 MHz.
0.75 dB @ 10 MHz.
1.20 dB @ 20 MHz.
1.50 dB @ 30 MHz. |
DC to 30 MHz.
0.75 dB @ 10 MHz.
1.20 dB @ 20 MHz.
1.50 dB @ 30 MHz. |
| Hum Reduction |
50 dB for 60 Hz. hum,
depending on system |
60 dB for 50 Hz
or 60 Hz. hum,
depending on system |
60 dB for 50 Hz
or 60 Hz. hum,
depending on system |
| Insertion Loss |
.2 dB max. |
.2 dB max. |
.2 dB max. |
| Return Loss |
20 dB min. |
20 dB min. |
20 dB min. |
| Isolation Between Channels (Typical) |
N/A |
N/A |
N/A |
| Package |
Hi-Impact ABS Plastic |
Die Cast Metal |
Die Cast Metal |
| Mounting |
Four (4)
8-32 x 1/2" Inserts |
Four (4)
6-32 x 1/2" Inserts |
Four (4)
6-32 x 1/2" Inserts |
Dimensions:
ht. x width x depth |
5-3/8" x 4" x 2" |
4-11/16" x 3-11/16" x 2-1/16" |
4-11/16" x 3-11/16" x 2-1/16" |
| Weight |
2.5 lbs. |
3-1/2 lbs. |
3-1/2 lbs. |
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HEC-3000 |
HEC-4000 |
HEC-5000 |
| Impedance: (Ohms) |
75 Ohms
Unbalanced |
GBR: Balanced
Sync Balanced |
75 Ohms
Unbalanced |
| Bandwidth: |
DC to 30 MHz.
0.75 dB @ 10 MHz.
1.20 dB @ 20 MHz.
1.50 dB @ 30MHz. |
GBR: DC to 30 MHz.
Sync: 20 Hz to 6 MHz
0.75 dB @10 MHz
1.00 dB @ 20 MHz
1.25 dB @ 30 MHz |
DC-100 MHz |
| Hum Reduction: |
60 dB for 60 Hz or 60 Hz hum, depending on system |
60 dB for 60 Hz or 60 Hz hum, when used in GBR or YUV systems |
60 dB Minimum per channel |
| Insertion Loss: |
0.2 Db Max |
0.2 Db Max |
0.20 dB 100 KHz
0.30 dB @ 10 MHz
0.80 dB @ 30 MHz
1.20 dB @ 100 MHz |
| Return Loss: |
20 dB Min |
20 dB Min |
20 dB Min |
| Isolation Between Channels (Typical) |
70 dB |
80 dB |
70 dB |
| Package: |
Die Cast Metal |
Die Cast Metal |
Die Cast Aluminum |
| Mounting |
Four (4)
6-32 x 1/2" Inserts |
Four (4)
6-32 x 1/2" Inserts |
Four (4)
6-32 x 1/2" Inserts |
Dimensions
ht. x width x depth |
7-7/16" x 4-3/4" x 3-1/16" |
7-7/16" x 4-3/4" x 3-1/16" |
7-7/16" x 4-3/4" x 3-1/16" |
| Weight |
10 lbs. |
7.5 lbs. |
6 lbs. |
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Single Channel Video Hum Eliminator
Models HEC-2000H, HEC-2000-HEC-2000-V |
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Features
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Flat Response |
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Bandwidths up to 30MHz |
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No Low or High Frequency Roll-Off |
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No Differential Gain or Phase Distortion |
 |
Rugged, Waterproof Case |
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BNC Connectors |
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Passive Device - Failure Free |
 |
For Color and Black & White |
 |
Reversible |
 |
Small, Compact Package |
|
Applications
 Field |
|
 |
Between Remote Truck, Telco & Microwave |
 |
For Intertruck Hookup |
 |
For VTR Units |
 |
For Monitoring Lines |
|
 Studio |
 |
Between Buildings |
 |
On Long Runs in Buildings |
 |
Between Studios & Transmitters |
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On Incoming & Outgoing Telco Circuits |
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The HEC-2000-V now joins the line of single-channel Hum Eliminators manufactured by Allen Avionics. Like the HEC-2000 and the HEC-2000-H, the HEC-2000-V stops all 50 Hz and 60 Hz hum. The HEC-2000 Series is designed to eliminate hum in video applications caused by long cable runs or ground loops.
This new edition is a heavy-duty version, like the HEC-2000-H, and features 1/4" thick, stainless steel guard rails to protect the connectors when not in use.
With the addition of the HEC-2000-V to the HEC-2000-H, the end user has a choice of connector location and protection, plus the performance of the standard HEC-2000. The HEC-2000-H is designed for optional rack mounting installation. (see below)
The HEC series works in circumstances where interference is caused by small differences in ground potential (less than 20 volts) or by induced currents in long cable runs. When there are multiple power panels in a building, or even a single floor, equipment and lighting loads resut in small differences in potential which induce a ground loop current flow and 60 Hz hum. (see Figure 1)
Electronically-induced current flows in long cable runs also create hum. For 50 Hz and 60 Hz power systems, and where induced currents are high, the HEC-2000, HEC-2000-H and HEC-2000-V increase the attenuation at the power frequency.
Should a small amount of hum remain after an HEC has been added to the circuit, a second HEC can be added in series, without significant degradation of the video signal.. |
| Model Number HEC-2000, HEC-2000-H, HEC-2000-V Electrical Specifications |
- Impedance: 75 Ohms, Unbalanced
- Bandwidth: DC to 30 MHz
- Insertion Loss:
- 0.75 dB @ 10 MHz
- 1.20 dB @ 20 MHz
- 1.50 dB @ 30 MHz
- Return Loss: 20 dB
- Hum Reduction: 60 dB fo 50 Hz or 60 Hz systems
- Packaging: Die Cast Metal
- Mounting: Four (4) 6-32 x 1/2" inserts
- Dimensions: See below
- Weight: 3-1/2 Lbs.
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Single Channel Video Hum Eliminator
Models HEC-500, HEC-1000 |
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Features
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Flat Response |
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Bandwidths up to 30MHz |
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No Low or High Frequency Roll-Off |
 |
No Differential Gain or Phase Distortion |
 |
Rugged, Waterproof Case |
 |
BNC Connectors |
 |
Passive Device - Failure Free |
 |
For Color and Black & White |
 |
Reversible |
 |
Small, Compact Package |
|
Applications
 Field |
|
 |
Between Remote Truck, Telco & Microwave |
 |
For Intertruck Hookup |
 |
For VTR Units |
 |
For Monitoring Lines |
|
 Studio |
 |
Between Buildings |
 |
On Long Runs in Buildings |
 |
Between Studios & Transmitters |
 |
On Incoming & Outgoing Telco Circuits |
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| Model Number HEC-500, HEC-1000 Electrical Specifications |
- Impedance Model HEC-500: 50 Ohms, Unbalanced
- Impedance Model HEC-1000: 75 Ohms, Unbalanced
- Bandwidth: DC to 30 MHz
- 0.61 dB @ 10 MHz
- 1.00 dB @ 20 MHz
- 1.25 dB @ 30 MHz
- Insertion Loss: 0.2 dB max.
- Return Loss: 20 dB min.
- Hum Reduction: 50 dB for 60 Hz hum depending on the system
- Packaging: Hi-Impact ABS Plastic
- Mounting: Four (4) 8-32 x 1/2" inserts
- Dimensions: 5-3/8" x 4" x 2"
- Weight: 3 Lbs.
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