Today's Message Index:
----------------------
1. 01:05 AM - Re: icom ic-a200 ()
2. 06:35 AM - Re: Re: icom ic-a200 (icubob@newnorth.net)
3. 08:44 AM - Re: Grounding Of Fuel Senders (Dave VanLanen)
4. 12:52 PM - Re: Re: Grounding Of Fuel Senders (Robert L. Nuckolls, III)
5. 12:58 PM - Re: Re: icom ic-a200 (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: icom ic-a200 |
I recall from the factory manual and internal schematic I got a hold of,
that the power and grounds are ganged internally, but its been a while.
It do recall it's redundant, but it has been a few years.
Please no offense Ken just my 0.02 worth, the manual cautions against
start and stop with power on. It's a long running debate....blaa blaa, but
to each his own, every one has a choice and if it works fine, if you error
on side of caution, good as well.
The IC-200 does not have internal OV protection. So I do suggest folks
use a **Transorb on the CB/fuse for the radio if you don't have a more
elaborate OV protection system on the ICOM.
** Transorb or Mosorb are commercial names for Transient voltage suppressors,
basically special zener diodes, small inexpensive OV devices that will break
down at a specific voltage (range) and trip the CB or fuse. I use a couple for
the few avionics like the IC-200a that do not have internal OV protection or
robustness. Many late model avionics (see your manual) have isolated
internal power supplies with ability to handle spikes, and if the worst should
occur the damage is limited to the power filter & don't use extra OV protection
for those components.
George
PS What OV was that Ken, what happened?
********************************************
From: Ken <klehman@albedo.net>
Subject: Re: AeroElectric-List: icom ic-a200
Bob
A few years ago I traced all those multiple power and also the ground,
and signal ground connections on my A200 and found that they were all
connected together inside the radio. Suspect they were encouraging
redundant connections but there is no actual need for them.
On another thread, I almost always start and shut down with power on
this radio and no problems so far after a couple of hundred hours. No
radio master switch but OTOH one real over-voltage event was trapped by
my over-voltage protection.
Ken
********************************************
Message 2
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| Subject: | Re: icom ic-a200 |
someone pointed out to me that a panel switch for the radio and intercom allows
you to turn them on and the volume and squelch are then preset. good idea just
for that reason. bob noffs
----- Original Message -----
From: gmcjetpilot@yahoo.com
Sent: Saturday, December 13, 2008 3:04:00 AM GMT -06:00 US/Canada Central
Subject: AeroElectric-List: Re: icom ic-a200
I recall from the factory manual and internal schematic I got a hold of,
that the power and grounds are ganged internally, but its been a while.
It do recall it's redundant, but it has been a few years.
Please no offense Ken just my 0.02 worth, the manual cautions against
start and stop with power on. It's a long running debate....blaa blaa, but
to each his own, every one has a choice and if it works fine, if you error
on side of caution, good as well.
The IC-200 does not have internal OV protection. So I do suggest folks
use a **Transorb on the CB/fuse for the radio if you don't have a more
elaborate OV protection system on the ICOM.
** Transorb or Mosorb are commercial names for Transient voltage suppressors,
basically special zener diodes, small inexpensive OV devices that will break
down at a specific voltage (range) and trip the CB or fuse. I use a couple for
the few avionics like the IC-200a that do not have internal OV protection or
robustness. Many late model avionics (see your manual) have isolated
internal power supplies with ability to handle spikes, and if the worst should
occur the damage is limited to the power filter & don't use extra OV protection
for those components.
George
PS What OV was that Ken, what happened?
********************************************
From: Ken < klehman@albedo.net >
Subject: Re: AeroElectric-List: icom ic-a200
Bob
A few years ago I traced all those multiple power and also the ground,
and signal ground connections on my A200 and found that they were all
connected together inside the radio. Suspect they were encouraging
redundant connections but there is no actual need for them.
On another thread, I almost always start and shut down with power on
this radio and no problems so far after a couple of hundred hours. No
radio master switch but OTOH one real over-voltage event was trapped by
my over-voltage protection.
Ken
********************************************
Message 3
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| Subject: | Re: Grounding Of Fuel Senders |
Bob,
Can you explain why I don't need to worry about a ground loop in this
situation, (reference the explanation of ground loops on p. 5-6 of the
AeroElectric manual)?
Thanks,
Dave
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
Subject: Re: Grounding Of Fuel Senders
<http://www.matronics.com/searching/getmsg_script.cgi?INDEX=77203507?KEYS=se
nder?LISTNAME=AeroElectric?HITNUMBER=1?SERIAL=0831038265?SHOWBUTTONS=NO>
At 10:02 AM 12/12/2008, you wrote:
>I am installing VDO fuel senders in the metal fuel tanks of my
>all-metal kit aircraft. These senders do not have a ground lug, and
>the sender, by design, is not isolated ...
Metal tanks in a metal airplane will provide sufficient
ground for these senders to work as advertised. Adding
the wire as directed in the instructions will not hurt
anything either. Go ahead and install the requested wire
Bob . . .
Message 4
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| Subject: | Re: Grounding Of Fuel Senders |
At 10:38 AM 12/13/2008, you wrote:
>Bob,
>
>Can you explain why I don't need to worry about a ground loop in
>this situation, (reference the explanation of ground loops on p. 5-6
>of the AeroElectric manual)?
>
>Thanks,
>
>Dave
Because the loop is small. The tank grounds to the
airframe through mounting straps and brackets and
with a resistance that is a tiny fraction that of
any piece of wire you might install. Yeah, technically
there's a "loop" but so tiny both in architecture and
in terms of antagonistic currents as to be insignificant.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 5
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| Subject: | Re: icom ic-a200 |
At 03:04 AM 12/13/2008, you wrote:
<snip>
>
>The IC-200 does not have internal OV protection. So I do suggest folks
>use a **Transorb on the CB/fuse for the radio if you don't have a more
>elaborate OV protection system on the ICOM.
Would you care to recommend a part number? The catalogs
are full of all manner of Transorbs. What voltage and energy
rating device do you recommend?
>
>** Transorb or Mosorb are commercial names for Transient voltage suppressors,
>basically special zener diodes, small inexpensive OV devices that will break
>down at a specific voltage (range) and trip the CB or fuse. I use a
>couple for
>the few avionics like the IC-200a that do not have internal OV protection or
>robustness. Many late model avionics (see your manual) have isolated
>internal power supplies with ability to handle spikes, and if the
>worst should
>occur the damage is limited to the power filter & don't use extra OV
>protection
>for those components.
Which devices might these be? I'm not plugged into
all that circulates into the aircraft accessories
equipment market. If there are specific devices vulnerable
to "spikes" it would be well that we know which products
they are . . . and what levels of abuse is dangerous
for them. If you have specifics to share, it would
be helpful.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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