Direct access unit 8 3/16" MYAT (75 Ω) 256 kW with coupling elements product photo Front View L
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Direct access unit 8 3/16" MYAT (75 Ω) 256 kW with coupling elements

876750
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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 8 3/16" MYAT (75 Ω) 256 kW with coupling elements offers the most versatile and sophisticated possibility of direct access for measuring purposes of all kinds up to a power of 256 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:
4
Interface type:
8 3/16" MYAT (75 Ω)
8 3/16" MYAT (75 Ω)
N female (75 Ω) per IEC 61169-16
N female (75 Ω) per IEC 61169-16
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:
straight
Waveguide component type:
Direct access unit
Frequency range:
DC to 700 MHz
Frequency band:
Band 4/5, Band 3, Band 1, Band 2
Average power rating:
256 kW @ 100 MHz
167 kW @ 254 MHz
113 kW @ 550 MHz
100 kW @ 700 MHz
VSWR, max.:
1.03
Return loss min.:
36 dB

Mechanical characteristics

Weight, approx.:
30.0 kg
Length:
350.0 mm

Environmental conditions

Environmental conditions:
for limitations see "Environmental Conditions for Broadcast Products" TD-00060

Further remarks

Remark:
• RF measurements without dismantling rigid lines and cables
• quick and accurate:
→ antenna impedance testing and tuning
→ measurement of feeder VSWR and electrical length
• no need for measurement adaptors
• for outdoor application
• no limitation of power and voltage by direct access unit
Footnote:
Corresponding measurement insert:
BN 876755 (6.5 kg)

Maintenance set:
BN 876751
Customs tariff number:
85359000

Downloads

876730-DS.pdf

Product data sheet – 876750 – 876730-DS.pdf

TD-00178.pdf

Technical document – 876750 – application note – TD-00178.pdf