AeroElectric-List Digest Archive

Wed 07/17/13


Total Messages Posted: 5



Today's Message Index:
----------------------
 
     1. 02:01 AM - proper way to splice RG400 pigtails? (hotwheels)
     2. 07:31 AM - Re: proper way to splice RG400 pigtails? (Bill Putney)
     3. 07:46 AM - Re: Re: Combining alternator wires? (Steve Stearns)
     4. 08:07 AM - Re: proper way to splice RG400 pigtails? (Robert L. Nuckolls, III)
     5. 11:10 AM - Re: proper way to splice RG400 pigtails? (Robert L. Nuckolls, III)
 
 
 


Message 1


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    Time: 02:01:19 AM PST US
    Subject: proper way to splice RG400 pigtails?
    From: "hotwheels" <jaybrinkmeyer@yahoo.com>
    Is there a proper way to splice RG400 coax? This may have been discussed in the Aeroelectric docs, but I don't recall seeing it. RG400 pigtails were connected to the back of my radio stack and made it easy to work with coax runs under the panel. At the time BNC crimped connectors were used for splicing and they seem to work fine for the moment. However, I'm concerned that BNC may not offer the most reliable choice for the long term, especially when connecting coax runs that keep one flying in the right direction... I ran across an application that used SMA connectors... Better choice? If so, where can those be sourced for a reasonable price? Thanks, Jay RV-10 Phase 1 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=404822#404822


    Message 2


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    Time: 07:31:16 AM PST US
    From: Bill Putney <billp@wwpc.com>
    Subject: Re: proper way to splice RG400 pigtails?
    BNC connectors are a very nice constant impedance connector. The good ones are silver plated and I have seen ones that are still serviceable after half a century of aviation use. TNC is another choice and those connectors are available for RG400 as crimped connectors too. SMA connectors were developed specifically for higher frequencies with lower power handling capability in tighter spaces. If you have a connection for a receive-only (like a VOR antenna, GPS antenna, XM antenna) then SMA would work for that. I don't think SMA is mechanically superior to the BNC/TNC connectors. I wouldn't use an SMA connector on a transmit antenna (comm, xponder, etc). SMA connectors are probably going to be more expensive because they aren't as much of a commodity item as the BNC is. Pasternack is who I get connectors from. They probably are not the cheapest but they only carry good quality connectors and they have everything and I don't have to spend hours searching. http://www.pasternack.com/ You can expect to pay about $10 a piece for RG400 SMA Male connectors. Bill On 7/17/13 2:00 AM, hotwheels wrote: > > Is there a proper way to splice RG400 coax? This may have been discussed in the Aeroelectric docs, but I don't recall seeing it. > > RG400 pigtails were connected to the back of my radio stack and made it easy to work with coax runs under the panel. At the time BNC crimped connectors were used for splicing and they seem to work fine for the moment. However, I'm concerned that BNC may not offer the most reliable choice for the long term, especially when connecting coax runs that keep one flying in the right direction... > > I ran across an application that used SMA connectors... Better choice? If so, where can those be sourced for a reasonable price? > > Thanks, > Jay > RV-10 Phase 1 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=404822#404822 > >


    Message 3


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    Time: 07:46:57 AM PST US
    From: Steve Stearns <steve@tomasara.com>
    Subject: Re: Combining alternator wires?
    Don J. said: > With respect to the B-leads from the two alternators, does each one need to have > a separate wire up to the nose? Or can I install a single wire from the firewall > to the front that both alternators can tie in to? If I can do the single > wire approach, would all three wires need protection with ANL current limiters, > or just the two lines from the alternators? Bob K. replied: > If it were my airplane, the starter contactor > would be as close as practical to the starter > on the firewall. > > The starter contactor becomes a fat-wire tie > point to bring alternator b-leads to the bus > by tying their current limiters to the hot side of > the contactor. If it were my airplane (and this is the way I layed it out in my LongEz though I have yet to bother installing a starter and it's a single alternator configuration): I would put the ANL and both contactors up in the nose. The ANL in my installation is to protect against current flowing out the battery to a short in the wire going back to the alternator(s). The alternator(s) themselves current limit to a degree much more than a battery does. This wire only has to be sized to match the needs of the alternators. The fat starter wire is only live when the starter is being activated. The "cost" of this approach is the weight of the separate alternator wire, the benefit to me was eliminating the un-protected, always hot when the master is on, large wire running the whole length of the aircraft. Acceptable though this may be, I wasn't comfortable with it. A minor side benefit is that I had a better place to put the ANL and starter contactor up in the nose than back on/near the firewall. Boulder/Longmont, Colorado Restoring (since 1/07) and flying again (8/11!): N45FC O235 Longeze Cothern/Friling CF1 (~1000 Hrs) Flying (since 9/86): N43732 A65 Taylorcraft BC12D


    Message 4


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    Time: 08:07:36 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: proper way to splice RG400 pigtails?
    At 04:00 AM 7/17/2013, you wrote: > >Is there a proper way to splice RG400 coax? This may have been >discussed in the Aeroelectric docs, but I don't recall seeing it. > >RG400 pigtails were connected to the back of my radio stack and made >it easy to work with coax runs under the panel. At the time BNC >crimped connectors were used for splicing and they seem to work fine >for the moment. However, I'm concerned that BNC may not offer the >most reliable choice for the long term, especially when connecting >coax runs that keep one flying in the right direction... > >I ran across an application that used SMA connectors... Better >choice? If so, where can those be sourced for a reasonable price? Either one is just fine. I use SMA under heat shrink to splice salvaged cut-pieces for longer finished lengths. I can sell you a pair of BNC or SMA cable male and female connectors. The BNC are easier to install tho. Unless you have some practice with the SMA I'll suggest that BNC is your highest order probability for success. Bob . . .


    Message 5


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    Time: 11:10:14 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: proper way to splice RG400 pigtails?
    >>I ran across an application that used SMA connectors... Better >>choice? If so, where can those be sourced for a reasonable price? > > Either one is just fine. I use SMA under heat shrink > to splice salvaged cut-pieces for longer finished > lengths. When extending an existing coax, consider the value of trimming the original cable back some distance to move the splice to a more convenient location. Things can be pretty busy behind the panel and adding another mated pair of connectors only 6" away from one of your radios may not be the most attractive location. Cutting some of the original cable back before splicing on the extension offers an opportunity to put the spice in a less obtrusive location. Bob . . .




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