Today's Message Index:
----------------------
1. 09:21 AM - RG58 vs. RG59 (Lincoln Keill)
2. 09:46 AM - Re: RG58 vs. RG59 (Hinde, Frank George (Corvallis))
3. 11:08 AM - Re: RG58 vs. RG59 (Robert L. Nuckolls, III)
4. 12:45 PM - ANL current limiters in Z13-8 (Lincoln Keill)
5. 01:22 PM - Re: ANL current limiters in Z13-8 ()
6. 01:22 PM - Re: ANL current limiters in Z13-8 ()
7. 02:08 PM - Re: ANL current limiters in Z13-8 (Matt Prather)
8. 06:56 PM - Re: ANL current limiters in Z13-8 (Bob McCallum)
Message 1
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I am assembling an APRS system. -I have created an J-pole antenna out of
300 ohm twin-lead cable (designed to send out short 144.39 MHz data transmi
ssions) and have soldered onto that a short (18 inch) length of RG-58 coax.
.I note that AEC recommends RG-58 over RG-59 due to the latter's higher imp
edance. -To connect the coax to the APRS module requires a female SMA con
nector -- I found one at Radio Shack that says it is designed for crimping
onto RG-58 cable...so far so good. -I've been to three local stores and c
an only find strippers/crimpers for RG-59 cable. -However, the ones I fin
d online make it sound like tools for RG-58 and RG-59 cable are interchange
able. -I also note from Wikipedia [http://en.wikipedia.org/wiki/Coaxial_c
able] that RG-58 and RG-59 cable have slight differences in their inner, ou
ter and dielectric diameters.-
Question #1: -Can I successfully use an RG-59 stripper/crimper to attach
an SMA connector to RG-58 cable or do I need to find a tool specifically de
signed for RG-58 cable?
Question #2: -Will a crimping tool work equally well with BNC and SMA con
nectors or do I need separate tools for each?
Bonus question: -Would my J-pole antenna perform better laying flat (hori
zontal) in my fiberglass wingtip or looped around the leading edge so it ha
s some "vertical polarization"?
Thanks to whoever can provide guidance.
Lincoln KeillRV-7A Fuselage
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Message 2
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I bought my RG 58 BNC crimper from Radio Shack for about 11 bucks I think..
Just in case that will work.
Frank
________________________________
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectr
ic-list-server@matronics.com] On Behalf Of Lincoln Keill
Sent: Wednesday, September 09, 2009 9:17 AM
Subject: AeroElectric-List: RG58 vs. RG59
I am assembling an APRS system. I have created an J-pole antenna out of 30
0 ohm twin-lead cable (designed to send out short 144.39 MHz data transmiss
ions) and have soldered onto that a short (18 inch) length of RG-58 coax..I
note that AEC recommends RG-58 over RG-59 due to the latter's higher imped
ance. To connect the coax to the APRS module requires a female SMA connect
or -- I found one at Radio Shack that says it is designed for crimping onto
RG-58 cable...so far so good. I've been to three local stores and can onl
y find strippers/crimpers for RG-59 cable. However, the ones I find online
make it sound like tools for RG-58 and RG-59 cable are interchangeable. I
also note from Wikipedia [http://en.wikipedia.org/wiki/Coaxial_cable] that
RG-58 and RG-59 cable have slight differences in their inner, outer and di
electric diameters.
Question #1: Can I successfully use an RG-59 stripper/crimper to attach an
SMA connector to RG-58 cable or do I need to find a tool specifically desi
gned for RG-58 cable?
Question #2: Will a crimping tool work equally well with BNC and SMA conne
ctors or do I need separate tools for each?
Bonus question: Would my J-pole antenna perform better laying flat (horizo
ntal) in my fiberglass wingtip or looped around the leading edge so it has
some "vertical polarization"?
Thanks to whoever can provide guidance.
Lincoln Keill
RV-7A Fuselage
Do Not Archive
Message 3
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Subject: | Re: RG58 vs. RG59 |
At 11:17 AM 9/9/2009, you wrote:
>I am assembling an APRS system. I have created an J-pole antenna
>out of 300 ohm twin-lead cable (designed to send out short 144.39
>MHz data transmissions)
Why so mechanically complex an antenna in an airplane?
We're talking VHF which is line of sight. What leads
you to believe that this device will perform any better
than a simple 1/4-wave vertical used in VHF communications
applications?
>and have soldered onto that a short (18 inch) length of RG-58
>coax..I note that AEC recommends RG-58 over RG-59 due to the
>latter's higher impedance.
RG58's 50 ohm characteristic impedance has been
generally adopted by the electronics industry
as the design of choice for power handling capability
while the RG58's 75 ohm impedance is favored for
lower loss. The later is used in television and
low level signal situations.
> To connect the coax to the APRS module requires a female SMA
> connector -- I found one at Radio Shack that says it is designed
> for crimping onto RG-58 cable...so far so good. I've been to three
> local stores and can only find strippers/crimpers for RG-59
> cable. However, the ones I find online make it sound like tools
> for RG-58 and RG-59 cable are interchangeable. I also note from
> Wikipedia [http://en.wikipedia.org/wiki/Coaxial_cable] that RG-58
> and RG-59 cable have slight differences in their inner, outer and
> dielectric diameters.
Yes, connectors, strippers and application tools are
specific to the dimensions of the coax . . .
>Question #1: Can I successfully use an RG-59 stripper/crimper to
>attach an SMA connector to RG-58 cable or do I need to find a tool
>specifically designed for RG-58 cable?
You need the right tool . . .
>Question #2: Will a crimping tool work equally well with BNC and
>SMA connectors or do I need separate tools for each?
It's brand and part number specific. While MOST
manufacturer's of RG58 compatible connectors will
crimp the shield/pin grips with a .068"/.113" hexes,
it's not automatic. You need to match the tool with the
connector.
>Bonus question: Would my J-pole antenna perform better laying flat
>(horizontal) in my fiberglass wingtip or looped around the leading
>edge so it has some "vertical polarization"?
>
>Thanks to whoever can provide guidance.
Please consider a single run of RG400 from the accessory
to a simple 1/4-wave antenna on a ground plane fabricated
as described in many resources including the chapter
on antennas in the AeroElectric Connection.
You can get a compatible SMA male here:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ACX1192-ND
You can get a BNC male and the tool to install both
connectors at:
http://bandc.biz
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
Message 4
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Subject: | ANL current limiters in Z13-8 |
Spent an hour or so trying to visualize where everything is going to mount
on the firewall while studying Z-13/8 and came upon Note 10 regarding curre
nt limiters. -I understand that these are replacing the In-Line Fuses ref
erred to in Chapter 10 of AEC but had these questions:
1. -With a 40A alternator, do I use a 40A ANL current limiter?
2. -Any reason the 4 AWG wire (and ANL current limiter) from the alternat
or B lead can't go to the "downstream" side of the battery contactor instea
d of the "upstream" side of the starter contactor? -They both seem to be
electrically equivalent particularly since the wire between them is so shor
t.
3. -The following is found under Note 10. in AEC: -"Alternator noises i
n the system are reduced by not mounting the alternator breaker on the pane
l in the traditional fashion...consider installing the breaker as close as
possible to the starter contactor" --- Is this referring to the ANL curre
nt limiter described above or the circuit breaker for the alternator field?
-If the latter, I'm confused and hope someone can provide some more expl
anation.
Thanks.
Lincoln KeillRV-7A fuselage
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Message 5
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Subject: | ANL current limiters in Z13-8 |
Lincoln,
You may have read Bob's dribs and drabs on how ANL's (search list for
lots on this item) are of the slow-blow variety and will accommodate n
percentage of higher current just prior to blasting off the firewall.
You should need no more than 80% of your total draw. E.G. - a 40A ANL
may not blow until it loads up 50+ amps
Cost is not the issue, they are mostly the same. If you can get one with
a slightly lower rating (35) and your total draw is 40, you'd be good to
fly and have a margin of safety.
I think most rigs today with modern equipment have far less draw than
most believe. Putting a meter on is the only sure fire way to tell what
your day to day requirements are. I've got all kinds of EFIS IFR junk,
but none of them draw much more than 3 amps when they are really
sweating.
I've also got a 80 amp (bargain basement item) alternator that helps
keep the nose down, but unless I install central air-conditioning, I'll
never use the capacity. I've got a 30 A ANL in front of the load.
Glenn
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Lincoln Keill
Sent: Wednesday, September 09, 2009 3:44 PM
Subject: AeroElectric-List: ANL current limiters in Z13-8
Spent an hour or so trying to visualize where everything is going to
mount on the firewall while studying Z-13/8 and came upon Note 10
regarding current limiters. I understand that these are replacing the
In-Line Fuses referred to in Chapter 10 of AEC but had these questions:
1. With a 40A alternator, do I use a 40A ANL current limiter?
2. Any reason the 4 AWG wire (and ANL current limiter) from the
alternator B lead can't go to the "downstream" side of the battery
contactor instead of the "upstream" side of the starter contactor? They
both seem to be electrically equivalent particularly since the wire
between them is so short.
3. The following is found under Note 10. in AEC: "Alternator noises in
the system are reduced by not mounting the alternator breaker on the
panel in the traditional fashion...consider installing the breaker as
close as possible to the starter contactor" -- Is this referring to the
ANL current limiter described above or the circuit breaker for the
alternator field? If the latter, I'm confused and hope someone can
provide some more explanation.
Thanks.
Lincoln Keill
RV-7A fuselage
Do Not Archive
Message 6
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Subject: | ANL current limiters in Z13-8 |
Lincoln,
Sorry, yes #3 applies to the ANL. Having that big circuit breaker on the
panel is great if you need an alternate heat source in the cab, but not
very good design when we have these great ANL fuses. I've no experience
on #2 as I just went by Bob's drawing.
Glenn
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Lincoln Keill
Sent: Wednesday, September 09, 2009 3:44 PM
Subject: AeroElectric-List: ANL current limiters in Z13-8
Spent an hour or so trying to visualize where everything is going to
mount on the firewall while studying Z-13/8 and came upon Note 10
regarding current limiters. I understand that these are replacing the
In-Line Fuses referred to in Chapter 10 of AEC but had these questions:
1. With a 40A alternator, do I use a 40A ANL current limiter?
2. Any reason the 4 AWG wire (and ANL current limiter) from the
alternator B lead can't go to the "downstream" side of the battery
contactor instead of the "upstream" side of the starter contactor? They
both seem to be electrically equivalent particularly since the wire
between them is so short.
3. The following is found under Note 10. in AEC: "Alternator noises in
the system are reduced by not mounting the alternator breaker on the
panel in the traditional fashion...consider installing the breaker as
close as possible to the starter contactor" -- Is this referring to the
ANL current limiter described above or the circuit breaker for the
alternator field? If the latter, I'm confused and hope someone can
provide some more explanation.
Thanks.
Lincoln Keill
RV-7A fuselage
Do Not Archive
Message 7
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Subject: | ANL current limiters in Z13-8 |
> Lincoln,
>
>
snip
>
>
> I've also got a 80 amp (bargain basement item) alternator that helps
> keep the nose down, but unless I install central air-conditioning, I'll
> never use the capacity. I've got a 30 A ANL in front of the load.
>
>
> Glenn
>
>
Glenn,
Does your battery charging current go through this ANL? If so, on a cold
morning after a hard start, I believe your alternator might produce its
rated output (restoring the battery) for some amount of time (many
seconds), unrelated to bus loads. Seems like the ANL might be opened as a
result.
Regards,
Matt-
Message 8
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Subject: | ANL current limiters in Z13-8 |
Matt;
Don't forget that ANL fuses will carry considerably more than twice their
rated current almost indefinitely, certainly for many minutes. It's unlikely
that starting, even on those difficult cold mornings will drain the battery
enough that the alternator would work hard and long enough to "blow" the
ANL. The time constant graph for a 35 amp ANL shown in the attached link is
vertical at 90 amps meaning that it will hold indefinitely at that current
flow or any lesser value. It's unlikely that an 80 amp alternator would be
putting out over 100 amps for an extended period, and that's what it would
take to open the ANL. Under ideal conditions the 80 Amp alternator might
make it to 90 Amps, but not a lot more.
http://www.aeroelectric.com/articles/anl/anlvsjjs.html
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of Matt Prather
> Sent: Wednesday, September 09, 2009 5:00 PM
> To: aeroelectric-list@matronics.com
> Subject: RE: AeroElectric-List: ANL current limiters in Z13-8
>
<mprather@spro.net>
>
> > Lincoln,
> >
> >
> >
> snip
> >
> >
> > I've also got a 80 amp (bargain basement item) alternator that helps
> > keep the nose down, but unless I install central air-conditioning, I'll
> > never use the capacity. I've got a 30 A ANL in front of the load.
> >
> >
> >
> > Glenn
> >
> >
>
> Glenn,
>
> Does your battery charging current go through this ANL? If so, on a cold
> morning after a hard start, I believe your alternator might produce its
> rated output (restoring the battery) for some amount of time (many
> seconds), unrelated to bus loads. Seems like the ANL might be opened as a
> result.
>
>
>
> Regards,
>
> Matt-
>
>
>
> _-
> =====================================================
> =====
> _-
> =====================================================
> =====
> _-
> =====================================================
> =====
> _-
> =====================================================
> =====
>
>
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