Avionics News May 2018 - 65

Harbour Industries is a major supplier of the QPL certified M17/128-RG400 coax cables that WireMasters stocks, so our
team reached out to get the company's input on these new upgrades.
"No doubt, the FAA's requirement that virtually all aircraft will need ADS-B Out compliance by 2020 is a very big deal,"
said Trum Rittling, director of sales for aerospace cables at Harbour. "Aircraft flying without ADS-B Out may be denied
access to airspace. Often, cables are the last consideration of avionics system installers, but without the proper upgrade to
M17/128-RG400, the system will simply not work."
Prior to ADS-B, RG58 was often the coax cable of choice. You can find a comparison chart of the RG58 coax and the
M17/128-RG400 coax in the infographic. Weight savings is always a topic of discussion within the aviation industry, and
the RG58 is the lightweight option. However, you will notice that the temperature ratings of the M17/128-RG400 exceed
well beyond those of the RG58. Its high-temperature rating is part of what makes the M17/128-RG400 such a highperformance cable.
ADS-B transponders require these high-performance cables and demand maximum signal transfer speeds, which is where
the Velocity of Propagation (VoP) rating plays a part. With a 69.5 percent VoP offered on the RG400 versus 66 percent VoP
on the RG58, the signals can travel through the constructed cable at a faster speed using the RG400. The signal travel also
depends on the attenuation and frequency ratings.
In the chart, the RG400 has a maximum frequency of 12.4 GHz compared to 5 GHz using the RG58. The stranding on
the RG400 silver-covered copper conductors allows for a higher attenuation rating, therefore giving a higher maximum
frequency and over a longer distance.

Both coaxial cables fall under the MIL-DTL-17/MIL-C-17 military specifications. Cables covered by this
specification are primarily intended for use as transmission lines to conduct energy in a simple power transfer
continuously or intermittently.
For a list of all specs, visit wiremasters.net/Portals/0/Blog/rg400/MIL-DTL-17H.PDF.
For the QPL listings for these specs, visit http://qpldocs.dla.mil/search/parts.aspx?qpl=8. q
avionics news

*

may

2018

65



http://www.wiremasters.net/Portals/0/Blog/rg400/MIL-DTL-17H.PDF http://qpldocs.dla.mil/search/parts.aspx?qpl=8

Table of Contents for the Digital Edition of Avionics News May 2018

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