hi All,
A simple question this time!
What is the best coax cable to use in a cubesat? Size, flexibility/min radius, existing space heritage, ease of applying connectors are our main design drivers - we are only using UHF and VHF so losses are not going to be too much of a problem hopefully..
many thanks in advance
73
Graham G3VZV
----- Original Message ----- From: "Graham Shirville" g.shirville@btinternet.com To: "CubeSat @ CubeSat.org" cubesat@cubesat.org; "AMSAT BB" amsat-bb@amsat.org Sent: Wednesday, April 20, 2011 1:41 PM Subject: [amsat-bb] advice request for FUNcube
hi All,
A simple question this time!
What is the best coax cable to use in a cubesat? Size, flexibility/min
radius, existing space heritage, ease of applying connectors are our main design drivers - we are only using UHF and VHF so losses are not going to be too much of a problem hopefully..
many thanks in advance
73
Graham G3VZV
Hi Graham, G3VZV
Recommended types are 50 ohm semirigid hand formable coax cables with outside diamters of 0.86 mm , 1.2 mm and 2.2 mm with SMB or SMC connectors and 3.6 mm with SMA connectors.
See the catalogue http://www.rfmicrowave.it/catalogue.php?lang=eng
sections COAX CABLES and CONNECTORS
Various characteristic impedances are available, 12.5-25-35-50-70-75 Ohm
73" de
i8CVS Domenico
Graham,
You could try Quasi-flex from Axon. Not sure of flight heritage, but they are a very helpful bunch of people to deal with (and on the same timezone).
Best regards, James Barrington-Brown, SSBV
From: cubesat-bounces@cubesat.org [mailto:cubesat-bounces@cubesat.org] On Behalf Of Graham Shirville Sent: 20 April 2011 12:41 To: CubeSat @ CubeSat.org; AMSAT BB Subject: [CubeSat] advice request for FUNcube
hi All,
A simple question this time!
What is the best coax cable to use in a cubesat? Size, flexibility/min radius, existing space heritage, ease of applying connectors are our main design drivers - we are only using UHF and VHF so losses are not going to be too much of a problem hopefully..
many thanks in advance
73
Graham
G3VZV
Graham, My vote would be RG-188A/U. See my AMSAT-IARU Link Model Rev 2.4.3; Line Loss Tools and Tables Tab; First entry. Use the calculator there to get losses at various frequencies. It's PTFE wrapped and there are SMA and SMC connectors made for it. Or you can solder it directly to the transmitter output, if you are careful. It's pretty flexible and can have about the shortest bend radius of any coax available. In the end, however, that might be your biggest problem in a Cubesat - making the short bends. Jan
On Wed, Apr 20, 2011 at 9:41 PM, Graham Shirville < g.shirville@btinternet.com> wrote:
hi All,
A simple question this time!
What is the best coax cable to use in a cubesat? Size, flexibility/min radius, existing space heritage, ease of applying connectors are our main design drivers - we are only using UHF and VHF so losses are not going to be too much of a problem hopefully..
many thanks in advance
73
Graham G3VZV
CubeSat mailing list CubeSat@cubesat.org http://lists.cubesat.org/mailman/listinfo/cubesat
Hi Jan,
Many thanks for the valuable advice..yes I think the bend radius will be the most important parameter for us.
cheers
Graham G3VZV ----- Original Message ----- From: Jan King To: Graham Shirville Cc: CubeSat @ CubeSat.org ; AMSAT BB Sent: Friday, April 22, 2011 1:22 AM Subject: Re: [CubeSat] advice request for FUNcube
Graham, My vote would be RG-188A/U. See my AMSAT-IARU Link Model Rev 2.4.3; Line Loss Tools and Tables Tab; First entry. Use the calculator there to get losses at various frequencies. It's PTFE wrapped and there are SMA and SMC connectors made for it. Or you can solder it directly to the transmitter output, if you are careful. It's pretty flexible and can have about the shortest bend radius of any coax available. In the end, however, that might be your biggest problem in a Cubesat - making the short bends. Jan
On Wed, Apr 20, 2011 at 9:41 PM, Graham Shirville g.shirville@btinternet.com wrote:
hi All,
A simple question this time!
What is the best coax cable to use in a cubesat? Size, flexibility/min radius, existing space heritage, ease of applying connectors are our main design drivers - we are only using UHF and VHF so losses are not going to be too much of a problem hopefully..
many thanks in advance
73
Graham G3VZV
_______________________________________________ CubeSat mailing list CubeSat@cubesat.org http://lists.cubesat.org/mailman/listinfo/cubesat
Hi Jan and Graham
If the biggest problem in a Cubesat is making the short bends as possible it seems that the RG-178 B/U is preferable because it is PTFE rated at -55 to +200 °C and only 0.072" in diameter and its minimum bending radius is 9 mm against 15 mm for the type RG-188 A/U
The RG-178 B/U can be used with IPEX MHF connector, MMCX Connector, MCX Connector, SSMB Connector and SMA Connector or directly soldered in place if possible.
I have a few meters of RG-178 B/U and if necessary I can send to you a piece of it into an envelope for test and experimentation.
See the RG-178 B/U specifications in the following page.
http://www.shbing.com/rg178-e.htm
73" de
i8CVS Domenico
----- Original Message ----- From: "Jan King" jking@eclipticenterprises.com To: "Graham Shirville" g.shirville@btinternet.com Cc: "AMSAT BB" amsat-bb@amsat.org; "CubeSat @ CubeSat.org" cubesat@cubesat.org Sent: Friday, April 22, 2011 2:22 AM Subject: [amsat-bb] Re: [CubeSat] advice request for FUNcube
Graham, My vote would be RG-188A/U. See my AMSAT-IARU Link Model Rev 2.4.3; Line Loss Tools and Tables Tab; First entry. Use the calculator there to get losses at various frequencies. It's PTFE wrapped and there are SMA and
SMC
connectors made for it. Or you can solder it directly to the transmitter output, if you are careful. It's pretty flexible and can have about the shortest bend radius of any coax available. In the end, however, that
might
be your biggest problem in a Cubesat - making the short bends. Jan
On Wed, Apr 20, 2011 at 9:41 PM, Graham Shirville < g.shirville@btinternet.com> wrote:
hi All,
A simple question this time!
What is the best coax cable to use in a cubesat? Size, flexibility/min radius, existing space heritage, ease of applying connectors are our
main
design drivers - we are only using UHF and VHF so losses are not going
to be
too much of a problem hopefully..
many thanks in advance
73
Graham G3VZV
CubeSat mailing list CubeSat@cubesat.org http://lists.cubesat.org/mailman/listinfo/cubesat
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Rg 174 will work
nick
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Graham Shirville Sent: Wednesday, April 20, 2011 6:41 AM To: CubeSat @ CubeSat.org; AMSAT BB Subject: [amsat-bb] advice request for FUNcube
hi All,
A simple question this time!
What is the best coax cable to use in a cubesat? Size, flexibility/min radius, existing space heritage, ease of applying connectors are our main design drivers - we are only using UHF and VHF so losses are not going to be too much of a problem hopefully..
many thanks in advance
73
Graham G3VZV _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (5)
-
Graham Shirville -
i8cvs -
James Barrington-Brown [SSL] -
Jan King -
Nick Pugh K5QXJ