I found some BMS13-65-OG coax cable, aircraft type coax cable. Does anyone know the equivalent rg-xxx? I tried to google but not much is available, Is this a no loss like the lmr-400? Is there a mil spec for it because I can't find it?
What coax is this?
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k5uss
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I GOOGLE searched just BMS13-65 and got this info:
BMS13-65 is a 50 ohm, Tefon / Double Silver Braid, Dielectric &
Outer Jacket. Mil-Spec aircraft. 0.137" OD
This is just a bit larger than LMR-100 (.110"). LMR-100 has a loss of 8.8 dB in a 100' run at 146 MHz.
Not much good for scanning if it is as small as what I found doing the GOOGLE.
BMS13-65 is a 50 ohm, Tefon / Double Silver Braid, Dielectric &
Outer Jacket. Mil-Spec aircraft. 0.137" OD
This is just a bit larger than LMR-100 (.110"). LMR-100 has a loss of 8.8 dB in a 100' run at 146 MHz.
Not much good for scanning if it is as small as what I found doing the GOOGLE.
You are correct
Yes I found out there is no joy with teflon aircraft coax, I guess it is a small factor when you're 40k in the air but for those of us on the floor loss is loss and no good. Thank you for your info.
Yes I found out there is no joy with teflon aircraft coax, I guess it is a small factor when you're 40k in the air but for those of us on the floor loss is loss and no good. Thank you for your info.
LMR-100 uses polyethylene which has considerably different dielectric characteristics than Teflon so you're making an unfair comparison. Let's just call this coax "unknown" unless you can come up with some figures.
k5uss
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VXA, you make a good point... It is best to back up a claim whenever possible.
Called a friend of mine that INSTALLS aircraft components and asked him to look up some specs for me. According to him the Boeing BMS13-65 series is now obsolete and has been replaced with an equivalent coax with the same specifications with the exception of the diameter. The Macom FC11Z is 0.111 in diameter where the BMS was 0.110, no difference that any of us could see from a size standpoint...
The FC11Z does not have a solid PTFE dielectric but is wrapped with 3 layers of teflon tapes. It also contains the dual shields.
Now, for the specifications I stand by what I said earlier with the comparison to the LMR. The FC11Z has a loss of 20.403 dB/100 feet at 1 GHz. Doing a little calculating in my pea brain tells me that the loss at 150, 450, and even 800 MHz is going to be greater than we would like for scanner usage.
Here is a link to the spec sheet for the FC11Z.
http://www.macom.com/Markets/AerospaceDefense/Cables/data_sheets/FC11Z.pdf
Called a friend of mine that INSTALLS aircraft components and asked him to look up some specs for me. According to him the Boeing BMS13-65 series is now obsolete and has been replaced with an equivalent coax with the same specifications with the exception of the diameter. The Macom FC11Z is 0.111 in diameter where the BMS was 0.110, no difference that any of us could see from a size standpoint...
The FC11Z does not have a solid PTFE dielectric but is wrapped with 3 layers of teflon tapes. It also contains the dual shields.
Now, for the specifications I stand by what I said earlier with the comparison to the LMR. The FC11Z has a loss of 20.403 dB/100 feet at 1 GHz. Doing a little calculating in my pea brain tells me that the loss at 150, 450, and even 800 MHz is going to be greater than we would like for scanner usage.
Here is a link to the spec sheet for the FC11Z.
http://www.macom.com/Markets/AerospaceDefense/Cables/data_sheets/FC11Z.pdf
re: what coax is this
It seems strange that such loss figures are present with this cable, I have seen it installed on aircraft passenger phone systems and ACARS. I assume the range of the cable is at it's limits and what we have here is a specific cable with a specific freq range and application. Again not good enough for the scanner crowd.
It seems strange that such loss figures are present with this cable, I have seen it installed on aircraft passenger phone systems and ACARS. I assume the range of the cable is at it's limits and what we have here is a specific cable with a specific freq range and application. Again not good enough for the scanner crowd.
I believe this is a double shield version of RG-316/U, which has 20.0dB loss for 100ft at 400MHz. RG-316 is a teflon version of RG-174 and some connectors for these should be usable.
prcguy
prcguy
What you've touched upon but not really gotten to the heart of the matter is it's only good for very short runs. The small diameter is to save bulk and weight in cabling and Teflon of course is fire resistant. In an aircraft it's not far from the transceiver to the antenna, you'd be surprised where they are. For our purposes such a long run of lossy coax is a useless endeavor.
hoser147
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I could see where it could be used in a onboard phone system but I would like to know more about it, and would kinda agree with Warren. I got a 500ft spool of some unkown Beldon coax in the shed, might have to do some investigation on it, cant find a number just that its a belden spool
. Then there is always Plan B.:roll: .......... Go ahead and give it a shot and you can always make short runs from there on out.............Hser
. Then there is always Plan B.:roll: .......... Go ahead and give it a shot and you can always make short runs from there on out.............Hser
The sub miniature Teflon coax is not used in aircraft antenna installations, RG-400 and RG-142B/U is used for most common stuff and larger coax is used when very high power or loss is a consideration. The smaller Teflon coax like first described is most often used internally between radio/electronic modules for all sorts of equipment and not just the aircraft industry.
prcguy
prcguy
kb2vxa said:
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