Today's Message Index:
----------------------
1. 06:12 AM - Re: BNC connectors and SWR (user9253)
2. 07:27 AM - Re: Re: BNC connectors and SWR (John Cox)
3. 09:28 AM - Re: Re: BNC connectors and SWR (Charlie England)
4. 09:57 AM - Re: Re: BNC connectors and SWR (Kelly McMullen)
5. 10:39 AM - Re: Re: BNC connectors and SWR (Charlie England)
Message 1
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Subject: | Re: BNC connectors and SWR |
Since nobody else has replied, I will give my opinion which is only based reading
these forums.
No, the BNC connector splice will not affect SWR.
No, RF will not leak from this BNC spice.
Should a new cable be run: maybe. Anytime wires are spliced, a potential trouble
spot is created. If the spice is readily and easily accessible for future
inspection and troubleshooting, then OK, splice on additional cable. On the other
hand, if you want peace of mind and less chance of future problems, replace
the cable. RG400 or RG142 is better than RG58.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=453905#453905
Message 2
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Subject: | Re: BNC connectors and SWR |
Affirmative to each of the above points. However each connector introduces
additional db loss which will degrade transmission and to a lesser extent
reception. Don't cut the corner. Run a new cable run. We have fits with
four cable runs to upper TCAS antenna and especially lower runs. 8 cables
are a bitch and the central failure point in the absence of lighning
strikes directly with the Antenna.
John Cox
Avionics Tech
On Fri, Mar 18, 2016 at 6:09 AM, user9253 <fransew@gmail.com> wrote:
>
> Since nobody else has replied, I will give my opinion which is only based
> reading these forums.
> No, the BNC connector splice will not affect SWR.
> No, RF will not leak from this BNC spice.
> Should a new cable be run: maybe. Anytime wires are spliced, a potential
> trouble spot is created. If the spice is readily and easily accessible for
> future inspection and troubleshooting, then OK, splice on additional
> cable. On the other hand, if you want peace of mind and less chance of
> future problems, replace the cable. RG400 or RG142 is better than RG58.
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=453905#453905
>
>
Message 3
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Subject: | Re: BNC connectors and SWR |
You're technically correct.
But run the numbers to see if the degradation is enough to justify the
hassle of re-running an existing cable. The original post didn't make it
into this post, but if he's talking SWR, he's probably talking about a
comm; not a gigahertz range radio. How much range loss is there for 0.2 dB
insertion loss when a typical max *needed* range is maybe 30 miles? 1/2
mile? 1/10 mile? 50 feet?
The reliability issue remains, but in my experience, cutting into wire
bundles all over the plane to extract the old cable and run a new one
introduces many more and greater risks.
Another perspective...
On Fri, Mar 18, 2016 at 9:26 AM, John Cox <rv10pro@gmail.com> wrote:
> Affirmative to each of the above points. However each connector
> introduces additional db loss which will degrade transmission and to a
> lesser extent reception. Don't cut the corner. Run a new cable run. We
> have fits with four cable runs to upper TCAS antenna and especially lower
> runs. 8 cables are a bitch and the central failure point in the absence of
> lighning strikes directly with the Antenna.
>
> John Cox
> Avionics Tech
>
> On Fri, Mar 18, 2016 at 6:09 AM, user9253 <fransew@gmail.com> wrote:
>
>>
>> Since nobody else has replied, I will give my opinion which is only based
>> reading these forums.
>> No, the BNC connector splice will not affect SWR.
>> No, RF will not leak from this BNC spice.
>> Should a new cable be run: maybe. Anytime wires are spliced, a potential
>> trouble spot is created. If the spice is readily and easily accessible for
>> future inspection and troubleshooting, then OK, splice on additional
>> cable. On the other hand, if you want peace of mind and less chance of
>> future problems, replace the cable. RG400 or RG142 is better than RG58.
>>
>> --------
>> Joe Gores
>>
>>
Message 4
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Subject: | Re: BNC connectors and SWR |
That is one of the great trade-offs, difficulty vs quality
communications. A good com(6-8 watts), with good cable and good
antenna/ground plane can communicate over at least 50 nm or more. Very
important in some parts of the West, especially IFR.
On 3/18/2016 9:25 AM, Charlie England wrote:
> You're technically correct.
>
> But run the numbers to see if the degradation is enough to justify the
> hassle of re-running an existing cable. The original post didn't make it
> into this post, but if he's talking SWR, he's probably talking about a
> comm; not a gigahertz range radio. How much range loss is there for 0.2
> dB insertion loss when a typical max *needed* range is maybe 30 miles?
> 1/2 mile? 1/10 mile? 50 feet?
>
> The reliability issue remains, but in my experience, cutting into wire
> bundles all over the plane to extract the old cable and run a new one
> introduces many more and greater risks.
>
> Another perspective...
>
> On Fri, Mar 18, 2016 at 9:26 AM, John Cox <rv10pro@gmail.com
> <mailto:rv10pro@gmail.com>> wrote:
>
> Affirmative to each of the above points. However each connector
> introduces additional db loss which will degrade transmission and to
> a lesser extent reception. Don't cut the corner. Run a new cable
> run. We have fits with four cable runs to upper TCAS antenna and
> especially lower runs. 8 cables are a bitch and the central failure
> point in the absence of lighning strikes directly with the Antenna.
>
> John Cox
> Avionics Tech
>
> On Fri, Mar 18, 2016 at 6:09 AM, user9253 <fransew@gmail.com
> <mailto:fransew@gmail.com>> wrote:
>
> <fransew@gmail.com <mailto:fransew@gmail.com>>
>
> Since nobody else has replied, I will give my opinion which is
> only based reading these forums.
> No, the BNC connector splice will not affect SWR.
> No, RF will not leak from this BNC spice.
> Should a new cable be run: maybe. Anytime wires are spliced, a
> potential trouble spot is created. If the spice is readily and
> easily accessible for future inspection and troubleshooting,
> then OK, splice on additional cable. On the other hand, if you
> want peace of mind and less chance of future problems, replace
> the cable. RG400 or RG142 is better than RG58.
>
> --------
> Joe Gores
>
Message 5
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Subject: | Re: BNC connectors and SWR |
Fine; call it 70 miles. Run the numbers.
On 3/18/2016 11:54 AM, Kelly McMullen wrote:
> <kellym@aviating.com>
>
> That is one of the great trade-offs, difficulty vs quality
> communications. A good com(6-8 watts), with good cable and good
> antenna/ground plane can communicate over at least 50 nm or more. Very
> important in some parts of the West, especially IFR.
>
> On 3/18/2016 9:25 AM, Charlie England wrote:
>> You're technically correct.
>>
>> But run the numbers to see if the degradation is enough to justify the
>> hassle of re-running an existing cable. The original post didn't make it
>> into this post, but if he's talking SWR, he's probably talking about a
>> comm; not a gigahertz range radio. How much range loss is there for 0.2
>> dB insertion loss when a typical max *needed* range is maybe 30 miles?
>> 1/2 mile? 1/10 mile? 50 feet?
>>
>> The reliability issue remains, but in my experience, cutting into wire
>> bundles all over the plane to extract the old cable and run a new one
>> introduces many more and greater risks.
>>
>> Another perspective...
>>
>> On Fri, Mar 18, 2016 at 9:26 AM, John Cox <rv10pro@gmail.com
>> <mailto:rv10pro@gmail.com>> wrote:
>>
>> Affirmative to each of the above points. However each connector
>> introduces additional db loss which will degrade transmission and to
>> a lesser extent reception. Don't cut the corner. Run a new cable
>> run. We have fits with four cable runs to upper TCAS antenna and
>> especially lower runs. 8 cables are a bitch and the central failure
>> point in the absence of lighning strikes directly with the Antenna.
>>
>> John Cox
>> Avionics Tech
>>
>> On Fri, Mar 18, 2016 at 6:09 AM, user9253 <fransew@gmail.com
>> <mailto:fransew@gmail.com>> wrote:
>>
>> <fransew@gmail.com <mailto:fransew@gmail.com>>
>>
>> Since nobody else has replied, I will give my opinion which is
>> only based reading these forums.
>> No, the BNC connector splice will not affect SWR.
>> No, RF will not leak from this BNC spice.
>> Should a new cable be run: maybe. Anytime wires are spliced, a
>> potential trouble spot is created. If the spice is readily and
>> easily accessible for future inspection and troubleshooting,
>> then OK, splice on additional cable. On the other hand, if you
>> want peace of mind and less chance of future problems, replace
>> the cable. RG400 or RG142 is better than RG58.
>>
>> --------
>> Joe Gores
>>
>
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