Kingray KDM401 Quad AV SD Digital Modulator

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Kingray KDM401 Quad AV SD Digital Modulator

The Kingray KDM401 Digital Modulator is a commercial quality quad AV standard definition modulator with integrated multiplexing to combine all four AV inputs in one RF channel, maximising spectrum efficiency.
Ideal for converting an analogue AV signal either from a satellite decoder, DVD, video surveillance camera or video door phone and modulating it into a digital format (DVB-T) for distribution in a TV cable network.
With intuitive, simple menus, the KDM401 allows quick and easy programming either by the front panel or a computer using the ethernet port. The housing design allows the unit to be professionally mounted in a 19” rack or on a shelf if required.


Quad input AV SD modulator mulitplexed into one RF channel.
Easy to program basic and advanced menus.
Adjustable output level, frequency and offset.
Selectable 2K, 8K carrier.
Adjustable constellation, FEC and guard interval.
Adjustable colour, brightness, contrast and saturation.
Adjustable LCN, PID, SID, NIT, PDS and TS ID.
Programmable channel name.
Variable video and audio bit rates.

In the Box:
Instruction manual
Power lead


Electrical Specifications
Output Frequency Range: 174- 820 MHz (Aust) 470-820 MHz (NZ)
Maximum Output Level: 95 dBuV
Output Signal to Noise: 50dB
Test Point: -30dB
Audio input Level: 0.4-2.5 V p-p
Video Input Level: 0.5-2 V p-p
Channel Bandwidth: 7/8 MHz
Minimum Output Level: 80 dBuV
Modulation Format: COFDM 2K, 8K
Guard Interval: 1/4,1/8,1/16,1/32
Constellation: 16 QAM, 64 QAM
FEC Rate: 1/2, 2/3, 3/4, 5/6, 7/8
LCN: Yes
Modulation Error Rate: >42dB
Channel Naming 16 Characters

Mechanical Specifications
19′ Rack Mountable: Yes

Environmental Specifications
Temperature: operating: 0-+45 ° C

Power Supply
Operating Voltage: 110-240 V AC

What’s the difference between MPEG2 and MPEG4?

DVB-T (Digital Video Broadcasting – Terrestrial) is a standard for transmitting digital television signals over terrestrial (over-the-air) broadcast networks. MPEG-2 and MPEG-4 are video compression standards used in DVB-T to encode the video content.

  1. DVB-T MPEG-2: DVB-T MPEG-2 refers to the use of the MPEG-2 video compression standard within the DVB-T system. MPEG-2 is an older compression standard that was widely used for digital television broadcasting before the introduction of MPEG-4. It offers moderate compression efficiency, which means it requires more bandwidth to transmit video compared to MPEG-4 for the same quality. MPEG-2 provides good video quality, especially for standard definition (SD) content, and it is still compatible with many older television sets and receivers.
  2. DVB-T MPEG-4: DVB-T MPEG-4, on the other hand, uses the more advanced MPEG-4 video compression standard. MPEG-4 offers better compression efficiency, allowing broadcasters to transmit higher quality video using less bandwidth compared to MPEG-2. This is especially beneficial for high-definition (HD) and other bandwidth-intensive content. MPEG-4 can deliver superior video quality with the same amount of data or equivalent video quality with less data compared to MPEG-2. However, MPEG-4 requires more processing power for encoding and decoding, which means older television sets or receivers may not support MPEG-4 without a compatible decoder.

In summary, the main difference between DVB-T MPEG-2 and DVB-T MPEG-4 lies in the video compression standard used. MPEG-2 is an older standard with moderate compression efficiency but good compatibility with older devices, while MPEG-4 is a more advanced standard offering better compression efficiency for higher quality video but requiring more processing power and compatibility considerations.

How can I tell if my TV is MPEG2 or MPEG4?

Early digital TVs sold in Australia had MPEG2 DVB-T Tuners. Later models have progressed to MPEG4. Any MPEG4 TV will work with MPEG2 signals. However MPEG2 TVs will not work with MPEG4 signals including those from MPEG4 modulators.

It is often difficult to see from the TV’s specifications if the hardware is MPEG2 or MPEG4. The easiest way is to test the TV with a normal broadcast antenna signal. New HD Channels such as Channel 70 (7HD) or Channel 31 (SBS Viceland HD) are broadcast in MPEG4. If your TV produces a black picture or an error message such as FORMAT NOT SUPPORTED, then this TV is MPEG2 only.

To correct a MPEG2 only TV, a new DVBT Set Top Box can be used to tune the RF signal and convert it to a HDMI input on the TV.

Additional information

Weight 8 kg

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