Direct access unit 1 5/8" EIA 20 kW product photo Front View L
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Direct access unit 1 5/8" EIA 20 kW


Direct Access Units (DAU) and measuring inserts enable direct, low-loss access to the line system

With the help of the SPINNER Direct Access Units (DAU) the high-frequency power of coaxial broadcast antenna systems can be measured without having to disconnect them temporarily and take them out of operation. Our permanently installed direct access units enable direct, low-loss access to the line system via the so-called measurement inserts. For our customers, this means extremely little installation effort and very high precision, as the measurements on the system can be carried out in the end position. The portfolio now includes direct access units up to connection size 9 3/16'' EIA, all of which are suitable for outdoor use.

The use of the SPINNER Direct access unit 1 5/8" EIA 20 kW offers the most versatile and sophisticated possibility of direct access for measuring purposes of all kinds up to a power of 20 kW. There are two different application modes: normal through operation with installed standard cover (feed through insert) and the actual measuring operation with installed measurement insert. Due to the fixed installation and the very good technical characteristics of the direct access units, there are no degradation of VSWR or power rating on the coaxial line system during normal operation. On the other hand, the excellent galvanic connection in the measuring operation enables an extraordinary measuring accuracy.

RF characteristics

Number of interfaces:
Interface type:
1 5/8" EIA (50 Ω) per IEC 60339-2
1 5/8" EIA (50 Ω) per IEC 60339-2
7-16 female (50 Ω) per IEC 61169-4
7-16 female (50 Ω) per IEC 61169-4
Port / path designation:
Port 1, 2: main line
Port 3, 4: measuring connectors
Interface type remark:
Port 1, 2: Hauptleitung
Port 3, 4: Messanschlüsse
Interface direction:
Waveguide component type:
Direct access unit
Frequency range:
DC to 860 MHz
Frequency band:
Band 4/5, Band 3, Band 1, Band 2
Average power rating:
20 kW @ 100 MHz (at 40 °C ambient temperature)
13.5 kW @ 230 MHz (at 40 °C ambient temperature)
7 kW @ 860 MHz (at 40 °C ambient temperature)
Proof voltage rating:
7 kV
Proof voltage rating remark:
(at sea level, 86 - 106 kPa)
VSWR, max.:
Return loss min.:
40 dB

Mechanical characteristics

Weight, approx.:
3.67 kg
240.0 mm

Further remarks

• quick and direct access to coaxial line ports
• accurate measurements of VSWR and electrical length via galvanic contacts
• antenna testing and tuning without dismantling the connected feeders
• for outdoor use
• compliant for all broadcast standards
• measurement insert is supplied with storage case including spare parts
Corresponding measurement insert:
BN 495951 (2.2 kg)
Customs tariff number:



Product data sheet – 390906 – CB-L-213-DS.pdf


Technical document – 390906 – application note – TD-00178.pdf