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參數(shù)資料
| 型號： | ID2012 |
| 英文描述： | Lightning & EMP Protection Devices |
| 中文描述： | 閃電 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 56K |
| 代理商： | ID2012 |
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
I
Asia/Pacific:
Tel.
Fax
+85 2 2375 0618
+85 2 2375 0350
I
Europe: Tel.
+44 (1344) 869 595
Fax +44 (1344) 300 020
3
Specifications Subject to Change Without Notice.
Stub tuners are classified into two broad categories-
simple and broadband. The simple stub tuner exhibits a
V-shaped response on the VSWR vs. frequency plot. The
trough of the V is designed to occur at the required Fo
and the bandwidth is restricted to approximately 8%.
The broadband tuner employs extra RF techniques,
similar to multiple cavity filtering, which increase the
effective bandwidth by approximately 20%.
M/ A-COM offers a wide variety of stub tuners for
the most popular frequency bands to facilitate purchase
without need for custom design and manufacturing.
Designs exist for GSM, PCS 1900, DCS 1800 frequencies
with standard industry interfaces including SMA, 7-16,
and type “N”. Configurations include cable assemblies,
cabled connectors, and adapters for ease of assimilation
into existing systems. Stub tuners are maintenance free
since they incorporate no active components though it is
recommended that a check of the stub tuner affixment
be made following heavy discharges at an installation.
Selection of a Lightning Protection
Device
Below are the basic advantages and limitations for
both types of protection to use in the proper selection for
your application:
Surge Protectors
Advantages
Broadband
A llows DC bias on the transmission line.
(critical for applications using mast top electronics.)
No harmonic passband
Ease of retrofitting antenna sights
GDT easily accessible for replacement
Limitations
Routine maintenance recommended
2.5 GHZ maximum frequency
Initial pass-through voltage
l
/4 Stub Tuners
Advantages
Low VSWR in passband
Minimal maintenance
Pass - through voltage eliminated
No sparkover or residual voltage concerns
Ease of retro-fitting antenna sights
Limitations
Frequency specific
Harmonic passband
Does not allow DC bias on transmission line
Glossary of Terms
Arc Voltage
- voltage that continues to pass through a
surge
protector
during
(approx. 20 volts )
D.C. Sparkover Voltage
- defined as the maximum
voltage across a device before it discharges the energy to
ground when subjected to a slowly rising voltage ramp.
A rate of rise of 100V/ s is usually chosen for testing
purposes.
Gas Discharge Tube (GDT)
- hermetically sealed device
containing an inert gas.
Glow Mode
- condition in which the GDT continues to
conduct after an impulse passed. Characterized by a
visible glow in the device caused by over-heating.
Voltage Hold Over
- refers to the maximum line voltage
at which recovery of the GDT to its inactive state will
take place within a specified period period of time
(normally 150ms) after an induced lightning pulse
(normally 10/ 1000ms) has been applied.
Impulse D ischarge Current
- defined as the peak
current of an impulse which a GDT can withstand ten
times (5 at each polarity) without affecting the device.
Impulse Sparkover Voltage
- defined as the maximum
level of voltage across a device before it discharges the
energy to ground when subjected to a voltage impulse.
The three common waveform profiles used to determine
this capacity are:
activation
of
GDT
T2
T2=1.67T
t
TL
01
T
A
T
8
0
0.3
0.5
0.9
1.0
V
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