IOT
The IOTD 85T and IOTD 130T are high efficiency tube and circuit assemblies capable of operating in the UHF-TV frequency range of 470-810 MHz. The amplifiers are designed for digital transmitters requiring up to 30 kW average/130 KW peak output in 8VSB digital service or up to 70+7 kW in common mode service.
The IOTD 50 is designed for applications in today’s digital IOT transmitters. It is a drop-in replacement for the e2v 8303 and D250 and will provide outstanding performance in a wide variety of transmitters and unique operating conditions. Covering the complete range of UHF operating frequencies with 22 dB gain and 15/55KW of avg/peak power output, the L-3 IOTD 50 is ideal for low power installations where high peak power is not necessary.
The IOTD 85 is designed for the most widely used applications in today’s digital IOT transmitters. Designed as a drop in replacement for the e2v 8404 or D270, the IOTD 85 will provide outstanding performance in a wide variety of transmitters and unique operating conditions. Covering the complete range of UHF operating frequencies with 22 dB gain and up to 20/85 KW of avg/peak power, the L-3 IOTD 85 is the broadcaster’s choice for new or replacement service.
The IOTD 110 is the next highest power level used in today’s digital IOT transmitters. Designed as a drop in replacement for the e2v 8505 or D2100, the IOTD 110 will provide outstanding performance in digital transmitters for either 8 VSB or COFDM service. Covering the complete range of UHF operating frequencies with 22 dB gain and up to 25/110 KW of avg/peak power, the L-3 IOTD 110 is the broadcaster’s choice for a high performance replacement tube.
The IOTD 110P is a plug-in version of the IOTD 110 and is a direct replacement for the e2v D2100. All the advantages of a plug-in tube are available with this design without the expense of purchasing a new trolley assembly. A bi-directional contact ring replaces one of the contact rings on the existing output cavity which can be installed in less than one-hour. Connect a new set of cooling hoses and you are ready to get back on the air.
The IOTD 130 is the highest power digital IOT L-3 EDD manufacturers. With the advent of digital television, the L-3 IOTD 130 offers the broadcaster the ability to operate at 130 KW peak power for greater viewing area coverage. The tube fits in a standard size circuit assembly and typical OEM transmitter cabinet. This tube was formerly used in analog 70 + 7 kW service.
The IOTD 130D is designed as a direct replacement for the e2v D2130. Minor modifications to the cooling hoses are required and all hardware necessary for the tube replacement is included with the product. The modifications can be installed in less than 1 hour using simple hand tools.
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Digital IOT
Tube Type |
Equivalent
L-3
Type |
Equivalent
Tube
Cross
Reference |
Peak Output
8 VSB KW |
Avg Output
8 VSB KW |
Beam
Voltage
KV Max |
Avg Beam Current
A
Max |
Heater Voltage
V
Max |
Heater
Current
A Max |
| L-3 IOTD 50 |
L-4481 |
8303, IOTD250 |
50 |
15 |
32 |
1.8 |
7 |
30 |
| L-3 IOTD 85 |
L-4482 |
8404, IOTD270 |
85 |
20 |
32 |
2 |
7 |
30 |
| L-3 IOTD 110 |
L-4470 |
8505, D2100 |
110 |
25 |
36 |
2.5 |
7 |
30 |
| L-3 IOTD 110P |
L-4470P |
n/a |
110 |
25 |
36 |
2.5 |
7 |
30 |
| L-3 IOTD 130 |
L-4480 |
n/a |
130 |
30 |
36 |
2.5 |
7 |
30 |
| L-3 IOTD 130D |
L-4471 |
D2130 |
130 |
30 |
36 |
2.5 |
7 |
30 |
| L-3 CEA 130 |
L-4201 |
n/a |
130 |
30 |
38 |
2.5 |
7 |
30 |
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