Today's Message Index:
----------------------
1. 01:08 AM - Re: Active VOR antenna (ron marks)
2. 05:38 AM - Re: Active VOR antenna (Robert L. Nuckolls, III)
3. 07:54 AM - Re: Ideas on a "cost effective " ground power ? (Robert L. Nuckolls, III)
4. 10:57 AM - Re: Active VOR antenna ()
5. 11:18 AM - Re: Ideas on a "cost effective " ground power ? (Jeff Luckey)
6. 11:19 AM - Ideas on a "cost effective " ground power ? CLARIFICATION (Jeff Luckey)
7. 12:00 PM - Re: Ideas on a "cost effective " ground power ? CLA RIFICATION (Ben)
8. 02:20 PM - Re: Ideas on a "cost effective " ground power ? CLA RIFICATION (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Active VOR antenna |
Bob,
Hope springs eternal.... A wideband RF amp such as this on a tiny antenna,
while it may be OK, even great for a rooftop monitor, is not going to be a
satisfactory substitute for a tuned VHF nav antenna in an aircraft.
Overloading, crosstalk and s/n ratio are some of its inherent deficits. It
may seem to be good enough testing in the boonies, but ...
Try it. Play with it. But don't proceed in a way that you can't re-do
easily.
Ron
On Fri, Apr 24, 2015 at 1:55 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> nuckolls.bob@aeroelectric.com>
>
> At 15:43 2015-04-24, you wrote:
>
>> Bob,
>>
>> Have you been able to assess the active VOR antenna? We=99re abo
ut 30
>> days from first flight and really need a retrofit VOR antenna solution f
or
>> this bird as we discussed.
>>
>> Thanks,
>> James
>>
>
> It's in the que. I've got some boards to order
> for another project next week, this board can
> piggyback onto the 'scrap end' . . . thanks
> for rattling my cage. All the parts are on hand.
>
>
> Bob . . .
>
>
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>
>
Message 2
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Subject: | Re: Active VOR antenna |
At 03:06 2015-04-25, you wrote:
>Bob,
>Hope springs eternal....=C2 =C2 A wideband RF amp
>such as this on a tiny antenna, while it may be
>OK, even great=C2 for a rooftop monitor, is not
>going to be a satisfactory substitute for a
>tuned VHF nav antenna in an aircraft.
>Overloading, crosstalk and s/n ratio are some
>of=C2 its inherent deficits. It may seem to be
>good enough testing in the boonies, but ...
>Try it. Play with it. But don't proceed in a way that you can't re-do
easily.
>Ron
There's no 'hope' about it . . . performance of such
devices are well known . . . as are their shortcomings.
Nobody is talking about a free lunch here. The goal
is to explore an option for getting a VOR antenna
into a uniquely unfriendly space . . . into a tube
buried in a leading edge.
There are no promises or expectations for equivalency
-OR- resistance to the effects of inter modulation
distortion. The expectation is that it will offer
serviceable VOR performance under SOME conditions
with reservations.
It's a certainty that shortcomings will have to
be evaluated by the user. I've not fired up a
VOR receiver in the last 200-300 hours in the
log. The active antenna is a minimum effort,
low cost way to squeeze a bit more utility out
of a dying technology for this user in one airplane.
No warranty implied - it's a "caveat emptor" of the
first order.
Bob . . .
Message 3
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Subject: | Re: Ideas on a "cost effective " ground power ? |
JeffS,
Have you tried a good old fashion battery charger (not a
maintainer). There are lots of chargers that are capable of putting
out 10-15 amps which should be plenty to keep the avionics & most
accessories running. (unless you have some need to run the
high-current loads for really long periods of time?)
I have an ancient Sears charger that can put out about 15 amps all
day long & I use it to float loads when I'm bench testing.
A quick goole search found this:
Be wary . . . not all 'battery chargers' are
the same. When crafting a source of ac mains
powered DC for ground ops, the power supply
needs to be reasonably well REGULATED and
noise levels no greater than an engine driven
alternator.
Years ago I sold a 25A, 13.8V regulated
power supply for this purpose. I think I sold
them for about $125. As I recall, we sold
about a dozen.
Years later, there are even more attractive
versions of this approach to ground-power.
Here is one such device.
http://tinyurl.com/k6gf8gt
These have a voltage adjust pot that will
probably allow you to turn the 15v output
down to 14v.
CAUTION: If you plan to have a battery on
line, then make sure the battery is fully
charged. These are power supplies, not battery
chargers. Alternatively, use the power supply
'barefoot' and leave the battery off line.
Bob . . .
Message 4
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Subject: | Re: Active VOR antenna |
Kewl beans, Bob! Thanks again for the help.
-James
-----Original Message-----
From: Robert L. Nuckolls, III
Sent: Friday, April 24, 2015 3:55 PM
Subject: Re: AeroElectric-List: Active VOR antenna
<nuckolls.bob@aeroelectric.com>
At 15:43 2015-04-24, you wrote:
>Bob,
>
>Have you been able to assess the active VOR antenna? Were about 30
>days from first flight and really need a retrofit VOR antenna solution for
>this bird as we discussed.
>
>Thanks,
>James
It's in the que. I've got some boards to order
for another project next week, this board can
piggyback onto the 'scrap end' . . . thanks
for rattling my cage. All the parts are on hand.
Message 5
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Subject: | Re: Ideas on a "cost effective " ground power ? |
Bob,
Be wary . . . not all 'battery chargers' are
=C2- =C2- the same. When crafting a source of ac mains
=C2- =C2- powered DC for ground ops, the power supply
=C2- =C2- needs to be reasonably well REGULATED and
=C2- =C2- noise levels no greater than an engine driven
=C2- =C2- alternator.
Is your concern about regulation or ripple/voltage-spikes?
-Jeff
On Saturday, April 25, 2015 8:09 AM, "Robert L. Nuckolls, III" <nuckol
ls.bob@aeroelectric.com> wrote:
ls.bob@aeroelectric.com>
JeffS,
Have you tried a good old fashion battery charger (not a
maintainer).=C2- There are lots of chargers that are capable of putting
out 10-15 amps which should be plenty to keep the avionics & most
accessories running.=C2- (unless you have some need to run the
high-current loads for really long periods of time?)
I have an ancient Sears charger that can put out about 15 amps all
day long & I use it to float loads when I'm bench testing.
A quick goole search found this:
=C2- =C2- Be wary . . . not all 'battery chargers' are
=C2- =C2- the same. When crafting a source of ac mains
=C2- =C2- powered DC for ground ops, the power supply
=C2- =C2- needs to be reasonably well REGULATED and
=C2- =C2- noise levels no greater than an engine driven
=C2- =C2- alternator.
=C2- =C2- Years ago I sold a 25A, 13.8V regulated
=C2- =C2- power supply for this purpose. I think I sold
=C2- =C2- them for about $125. As I recall, we sold
=C2- =C2- about a dozen.
=C2- =C2- Years later, there are even more attractive
=C2- =C2- versions of this approach to ground-power.
=C2- =C2- Here is one such device.
http://tinyurl.com/k6gf8gt
=C2- =C2- These have a voltage adjust pot that will
=C2- =C2- probably allow you to turn the 15v output
=C2- =C2- down to 14v.
=C2- =C2- CAUTION: If you plan to have a battery on
=C2- =C2- line, then make sure the battery is fully
=C2- =C2- charged. These are power supplies, not battery
=C2- =C2- chargers. Alternatively, use the power supply
=C2- =C2- 'barefoot' and leave the battery off line.
=C2- Bob . . .
-
S -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 6
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Subject: | Ideas on a "cost effective " ground power ? CLARIFICATION |
It just occurred to me that my prior recommendation might not have been cle
ar.=C2- I think this is what BobN was getting at in his prior post.
I recommend using an automotive battery charger IN CONJUNCTION w/ a battery
to support electrical loads during construction/electrical system installa
tion.
I was NOT suggesting the use of that type of battery charger, all by itself
, as a power supply.
That my not have been clear from my earlier post.
-JeffL
Message 7
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Subject: | Re: Ideas on a "cost effective " ground power ? CLA |
RIFICATION
Jeff and all... That is why I used a new battery to run the devices and
a charger to keep the battery topped off.... My assumption is that havin
g the large battery in the loop would absorb any spikes, ripples or othe
r transient events... Worked perfect for me.... Bob... Am I thinking wr
ong on this concept??? Ben Haas
N801BH
www.haaspowerair.com
---------- Original Message ----------
From: Jeff Luckey <jluckey@pacbell.net>
Subject: AeroElectric-List: Ideas on a "cost effective " ground power ?
CLARIFICATION
It just occurred to me that my prior recommendation might not have been
clear. I think this is what BobN was getting at in his prior post. I r
ecommend using an automotive battery charger IN CONJUNCTION w/ a battery
to support electrical loads during construction/electrical system insta
llation. I was NOT suggesting the use of that type of battery charger, a
ll by itself, as a power supply. That my not have been clear from my ear
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Message 8
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Subject: | Re: Ideas on a "cost effective " ground power ? CLA |
RIFICATION
At 13:58 2015-04-25, you wrote:
>Jeff and all...
>
>That is why I used a new battery to run the devices and a charger to
>keep the battery topped off.... My assumption is that having the
>large battery in the loop would absorb any spikes, ripples or other
>transient events... Worked perfect for me....
>
>
>Bob... Am I thinking wrong on this concept???
Not at all, different technique with low
risk and performance that proved adequate to
your task. Recalling those famous words often
uttered by Ootek in Never Cry Wolf, "Good idea".
Bob . . .
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