[amsat-bb] Re: Cables for small satellites
g.shirville at btinternet.com
Thu May 5 04:53:25 PDT 2011
Many thanks to the kind experts who kindly sent us information in repect to
this enquiry a couple of weeks ago.
For FUNcube we have determined that the best coax for our purposes is RG178.
The following reasons:
we are only concerned with VHF and UHF signals
small minimum bend radius
suitability for a variety of connectors - we are using MCX, MMCX and SSMCX
connectors on different boards (for good reasons of course)
Lessons learnt and advice received included:
RG178 should not be used outside a spacecraft where it might be exposed to
The cables will need retaining in some way to resist viabration during
launch - glue to board or "tie" to structure.
The connectors will also need to be glued together before flight
It may be peferable/more reliable to solder cables directly to boards for
All connectors are designed for a limited number of insertions. Therefore
"saver" cable/connector assemblies should be used during most of the
There is a range of extra flexible semi-rigid cables available. (Thats
Like all COTS items used in space, the minimum bend radius rule of thumb - 6
times the outer diameter - should be derated if possible.
again thanks an apologies for the delay in getting the results back out:)
A simple question this time!
What is the best coax cable to use in a cubesat? Size, flexibility/min
existing space heritage, ease of applying connectors are our main design
- we are only using UHF and VHF so losses are not going to be too much of a
many thanks in advance
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