Today's Message Index:
----------------------
1. 07:27 AM - Noise from Garmin 496 (Marty)
2. 08:13 AM - Re: Noise from Garmin 496 (Dave Saylor)
3. 10:39 AM - Teflon Wire - 7 strands vs. 19 stands (dave.gribble@mchsi.com)
4. 01:07 PM - Re: Teflon Wire - 7 strands vs. 19 stands (Peter Pengilly)
5. 01:36 PM - Re: Teflon Wire - 7 strands vs. 19 stands (Robert L. Nuckolls, III)
6. 01:49 PM - Re: Teflon Wire - 7 strands vs. 19 stands (Bob McCallum)
7. 02:04 PM - Re: Teflon Wire - 7 strands vs. 19 stands (dave.gribble@mchsi.com)
8. 02:16 PM - Re: Noise from Garmin 496 (Kevin Klinefelter)
9. 03:44 PM - Re: Teflon Wire - 7 strands vs. 19 stands (Robert L. Nuckolls, III)
10. 06:04 PM - Computing a Resistor Value (AlRice)
11. 08:44 PM - Re: Computing a Resistor Value (Richard E. Tasker)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Noise from Garmin 496 |
I posted a message a few days ago and haven't seen one response. Question
is, has anyone else found that their Garmin handheld with 30A weather
antenna produces a periodic type "hiss" noise in their radios?
Marty
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Noise from Garmin 496 |
I get kind of a da-da-da-shhhh (repeat endlessly) from my 696. If I
disable the DC-IN it goes away. It's a pretty low level background
noise that I can live with. I've tried all kinds of filters and
alternate grounds with some relief but it's still noticeable. The
noise is there whenever the 696 is plugged in, whether its powered on
or not. I assume it has something to do with the battery being
charged/monitored.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Sun, Dec 12, 2010 at 7:21 AM, Marty <rv6awingman@gmail.com> wrote:
> I posted a message a few days ago and haven't seen one response. Question
> is, has anyone else found that their Garmin handheld with 30A weather
> antenna produces a periodic type "hiss" noise in their radios?
> Marty
>
>
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Teflon Wire - 7 strands vs. 19 stands |
I found some surplus M16878/4BGB1 wire. I think it is 20 AWG wire with teflon
insulation and coated copper conductors. It is made of 7 strands of wire. I
know that newer wire is made of up 19 strands. Will the 7 strand wire "work"
with crimp connections such as AMP FastOn and crimped D-sub pins?
Thanks for any info,
dave gribble
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Teflon Wire - 7 strands vs. 19 stands |
It will be very much less flexible than 19 strand wire, and so may break
in service.
Peter
On 12/12/2010 18:35, dave.gribble@mchsi.com wrote:
> --> AeroElectric-List message posted by: dave.gribble@mchsi.com
>
> I found some surplus M16878/4BGB1 wire. I think it is 20 AWG wire with teflon
insulation and coated copper conductors. It is made of 7 strands of wire.
I know that newer wire is made of up 19 strands. Will the 7 strand wire "work"
with crimp connections such as AMP FastOn and crimped D-sub pins?
>
> Thanks for any info,
>
> dave gribble
>
>
Message 5
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Teflon Wire - 7 strands vs. 19 stands |
At 12:35 PM 12/12/2010, you wrote:
>
>I found some surplus M16878/4BGB1 wire. I think it is 20 AWG wire
>with teflon insulation and coated copper conductors. It is made of
>7 strands of wire. I know that newer wire is made of up 19
>strands. Will the 7 strand wire "work" with crimp connections such
>as AMP FastOn and crimped D-sub pins?
See attached file for description of M16878 wires.
Yes, you have a Type E (600v thin teflon) wire that
will be 20AWG silver coated 7 strand copper.
Teflon was never real popular as an airframe wire.
It's not very tough although the temperature ratings
are great. 7-strand wire is not a really big deal.
A quintrillion vehicles including airplanes have
be wired with 7-strand wire . . . and we don't seem
to be hearing about the lack of vibration resistant
stranding.
If you got this wire cheap and you're thinking about
using a lot of it (it could probably substitute for
22AWG in most applications, then it's probably a
cost effective thing to do with no significant
increase in risks.
Bob . . .
Message 6
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Teflon Wire - 7 strands vs. 19 stands |
Dave;
Yes, it will "work" with respect to being properly secured by the various
terminals/connectors etc. However, 19 strand is considerably more flexible
and consequently more vibration resistant than 7 strand. Both may perform
satisfactorily in your application but if there is flexing involved
(vibration?) the finer stranding will last longer and will impart lower
loads on the devices to which it is attached. Gauge for gauge its fatigue
resistance will be greater and mechanical forces transmitted less. This is
the reason Bob recommends "welding cable" for fat wires due to its extremely
fine stranding and hence greater flexibility. (Having said all that the
fatigue resistance of the 7 strand may exceed the life of the airframe, but
regardless the 19 strand will outlast it from an apples to apples fatigue
standpoint)
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of dave.gribble@mchsi.com
> Sent: Sunday, December 12, 2010 1:36 PM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Teflon Wire - 7 strands vs. 19 stands
>
>
> I found some surplus M16878/4BGB1 wire. I think it is 20 AWG wire with
teflon
> insulation and coated copper conductors. It is made of 7 strands of wire.
I know that
> newer wire is made of up 19 strands. Will the 7 strand wire "work" with
crimp
> connections such as AMP FastOn and crimped D-sub pins?
>
> Thanks for any info,
>
> dave gribble
>
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
>
>
Message 7
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Teflon Wire - 7 strands vs. 19 stands |
Thanks Bob - great reply.. but I'm confused about why the 20AWG Teflon wire "could
substitute for 22AWG in most applications"
dave
----- Original Message -----
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Sent: Sunday, December 12, 2010 3:30:21 PM GMT -06:00 US/Canada Central
Subject: Re: AeroElectric-List: Teflon Wire - 7 strands vs. 19 stands
At 12:35 PM 12/12/2010, you wrote:
>
>I found some surplus M16878/4BGB1 wire. I think it is 20 AWG wire
>with teflon insulation and coated copper conductors. It is made of
>7 strands of wire. I know that newer wire is made of up 19
>strands. Will the 7 strand wire "work" with crimp connections such
>as AMP FastOn and crimped D-sub pins?
See attached file for description of M16878 wires.
Yes, you have a Type E (600v thin teflon) wire that
will be 20AWG silver coated 7 strand copper.
Teflon was never real popular as an airframe wire.
It's not very tough although the temperature ratings
are great. 7-strand wire is not a really big deal.
A quintrillion vehicles including airplanes have
be wired with 7-strand wire . . . and we don't seem
to be hearing about the lack of vibration resistant
stranding.
If you got this wire cheap and you're thinking about
using a lot of it (it could probably substitute for
22AWG in most applications, then it's probably a
cost effective thing to do with no significant
increase in risks.
Bob . . .
Message 8
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Noise from Garmin 496 |
I have a 496 with weather, mounted just above the comm radio. No hiss.
Power is through the external cable to the main bus.
Kevin
----- Original Message -----
From: Marty
To: Aeroelectric-List
Sent: Sunday, December 12, 2010 7:21 AM
Subject: AeroElectric-List: Noise from Garmin 496
I posted a message a few days ago and haven't seen one response.
Question is, has anyone else found that their Garmin handheld with 30A
weather antenna produces a periodic type "hiss" noise in their radios?
Marty
Message 9
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Teflon Wire - 7 strands vs. 19 stands |
At 03:58 PM 12/12/2010, you wrote:
>
>Thanks Bob - great reply.. but I'm confused about why the 20AWG
>Teflon wire "could substitute for 22AWG in most applications"
If you have a drawing that calls out 22AWG, then
you either go out and buy some 22AWG or you consider
substituting 20AWG assuming you don't mind taking the
hit on weight (very small) and the wire will fit into
all the crimped pins.
In terms of footage, 22AWG wire is the most popular size
in most airplanes. We did try 24AWG in the Premier . . .
I think the techs on the line are used to it now but
there was a lot of fuss at the beginning. It's more
difficult to work with.
I think I suggested to this List many years ago that
builders buy full spools of 20AWG wire (1000'). It's
cheaper in large quantities and can be used wherever
the drawings call for 22 or 20AWG. This one size MIGHT
account for 90% of all your wiring footage in a small
airplane and ease your procurement task.
Bob . . .
Message 10
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Computing a Resistor Value |
I want to install my AV80R GPS in my panel and wire the power lead to the bus without
installing a clunky cigarette power socket on my panel. The GPS input
voltage is 5V and it draws 1.5A (at least that's what the cigarette power lead
says on it). My buss voltage is 13.5V, so how do I compute the resistor ohm's
and watts needed for my power lead? I know enough about Ohm's law to be dangerous.
Thanks.
--------
Al Rice
Skybolt 260
RV-9A
Helping with my grandson's Piet
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323122#323122
Message 11
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Computing a Resistor Value |
Just adding a resistor is probably not a good idea. A resistor drops a
variable amount of voltage depending on the actual current consumption.
Additionally, your bus voltage will vary from 12V or less when the
alternator is off to as much as 14.2V when it is on. Unless the AV80R
draws a constant current (unlikely) and can handle a relatively wide
voltage input, you really do need to use the power cord or some other
source of 5V.
I couldn't find a manual to see what voltage it can handle, but given
they sell adapters for 12/24VDC and for 110/220VAC, it is likely that it
can use only a limited voltage (5V).
The markings on the adapter almost surely refer to the adapter capacity,
not the exact consumption of the AV80R.
For educational purposes, assuming that the AV80R actually did take
exactly 1.5A at 5V and your buss voltage was a constant 13.5V, you would
calculate the resistor value as follows:
The resistor would have to drop 13.5V minus 5V or 8.5V at 1.5A. Since
V=I*R or R=V/I, then R = 8.5V/1.5A or 5.666 ohms which is close to a
standard 5.6 ohm resistor. If we used that resistor we would actually
get 8.4V drop which gives us 5.1V for the AV80R which would probably be
close enough. The power dissipated in the resistor would be P=V*I or
8.4V*1.5A = 12.6W which would mean it would have to be a pretty large
wirewound ceramic resistor that would get mighty hot. Of course, all
this is based on the paragraph above this one, which is highly unlikely.
You can either find a 12V to 5V power converter to include behind the
panel or just use the optional cigarette lighter adapter provided by
Honeywell.
Dick Tasker
AlRice wrote:
> --> AeroElectric-List message posted by: "AlRice"<Allen@AllenRice.net>
>
> I want to install my AV80R GPS in my panel and wire the power lead to the bus
without installing a clunky cigarette power socket on my panel. The GPS input
voltage is 5V and it draws 1.5A (at least that's what the cigarette power lead
says on it). My buss voltage is 13.5V, so how do I compute the resistor ohm's
and watts needed for my power lead? I know enough about Ohm's law to be dangerous.
> Thanks.
>
> --------
> Al Rice
> Skybolt 260
> RV-9A
> Helping with my grandson's Piet
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=323122#323122
>
>
>
--
Please Note:
No trees were destroyed in the sending of this message. We do concede, however,
that a significant number of electrons may have been temporarily inconvenienced.
--
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|