7-2013

RF & Wireless
San-tron Enhances SRX Low-PIM Cable Assemblies Line,
Improves Stability and Repeatability
The SRX cable assemblies serve PIMsensitive
environments though 6 GHz and
military/avionics environments through 20
GHz, meeting requirements for robust survivability
in high-frequency applications.
Designed to support systems integrators,
the SRX low-PIM cable assemblies combine
San-tron’s low-distortion eSeries coaxial
connectors with high-quality SRX
coaxial cables.
San-tron now offers seven complete SRX
cable assembly deployment scenarios:
in-cabinet, plenum-rated, short runs and
jumper applications, long-haul cable runs,
indoor use, outdoor use, and riser, with
interconnect options for SMA, Type N,
7/16, and TNC mating. For in-cabinet
and plenum-rated deployments, low-PIM
SRX cable assemblies utilize flexible-141,
conformable-141, and semi-rigid RG-402
cable. The flexible solutions support plenum-rated
deployments that range from
150 W at 2.5 GHz through 90 W at 6 GHz.
Characterized by PIM performance of -161
dBc and attenuation of 22 dB per 100 feet,
these cable assemblies offer a bend radius
of 0.75 inches and handle operating temperatures
to +125 °C. For short runs and
jumper applications, San-tron has developed
a unique solution for clamp-type
terminations to braided, flexible coaxial
cables. Based on TCOM-240TM cable,
these assemblies support power levels that
range from 160 W at 2.5 GHz through 90
W at 6 GHz. Characterized by PIM performance
of -161 dBc and attenuation of
13 dB per 100 feet, these cable assemblies
offer a bend radius of 2.5 inches and handle
operating temperatures to +85 °C. Performance
is stable under vibration within a
1 dB window.
For flame-retardant requirements, SRX
assemblies employ TCOM-240-FR cables;
for plenum-rated installations, assemblies
feature SFT-205TM cables with a temperature
rating to +165 °C and a power
rating of 420 W.
For long-haul run deployments requiring
robust, low-loss performance, San-tron
implemented similar techniques for the
larger TCOM-400 series to achieve extremely
low and stable PIM levels, while
allowing for continuous bending and flexure.
With TCOM-400 cable, these cable
assemblies support power levels that range
from 310 W at 2.5 GHz through 180 W
at 6 GHz. Characterized by PIM performance
of -161 dBc and low attenuation
of 7 dB per 100 feet, these assemblies
offer a bend radius of 4 inches and handle
operating temperatures to +85 °C. Performance
is stable under vibration within a 1
dB window. For flame-retardant requirements,
SRX assemblies employ TCOM-
400-FR cables; for plenum-rated installations,
assemblies feature SFT-393 cables
with a temperature rating to +165 °C and
a power rating of 1020 W.
■ San-tron, Inc
www.santron.com
Low-EMI Oscillators from Euroquartz with 1,8-V-Supply-Voltage
Frequency control specialist,
Euroquartz has added another
oscillator to the company’s range
of Spread Spectrum low-EMI
oscillators that reduces electromagnetic
interference by up to
–15 dB. The new 18HM series
oscillators have a supply voltage
of 1.8 V. The part is available in
three standard surface mount
package sizes: 3.2 x 2.5 mm,
5 x 3.2 mm and 7 x 5 mm. The
oscillators are drop-in replacements
for standard clocks. The
low-cost oscillators offer the
significant advantage of reducing
EMI at source, i.e. the
system clock oscillator, so that
there is no need to employ costly
shielded backplanes, ferrite cores
and similar techniques to reduce
EMI. Euroquartz 18HM series
low-EMI oscillators are available
with a choice of modulation
rates and spread type. A Spread
Spectrum oscillator disperses
the mode energy over a wide
bandwidth. This is achieved by
the frequency modulation technique
which may be applied
to the down side of the nominal
frequency (known as down
spread) or spread equally either
side of nominal (called centre
spread). The majority of applications
use Centre Spread although
Down Spread is the preferred
technique if overclocking
would cause system problems.
Common specifications for the
new HM18 oscillators are frequency
range from 12.5 to 42.0
MHz, CMOS output logic, DC
input voltage of 1.8 V ± 0.15 V,
frequency stability options of
±25ppm, ±50ppm and ±100ppm
for commercial (0 to +70 °C)
and industrial (-40 to +85 °C)
devices, rise/fall times of 2.5 ns
maximum, 15 pF load and startup
time 2 ms typical. Duty cycle
is 50% ±10%, standard, cycle to
cycle jitter is ±100 ps maximum
and ageing is ±5ppm/year maximum
at 25 °C. Supplied on EIA
16 mm tape and reel in quantities
of 1000, the new 18HM series
low EMI, low voltage oscillators
are RoHS compliant and
lead-free. The devices are reflow
solder compatible and can withstand
two processes at 260 °C for
10 seconds maximum.
■ Euroquartz Ltd/Frequency
Products Ltd
sales@euroquartz.co.uk
www.euroquartz.co.uk
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