Today's Message Index:
----------------------
1. 04:42 AM - Re: ***SPAM*** Off topic -- Slowing an electric motor (bob-tcw)
2. 06:38 AM - wiring thre phase power (Chris Hukill)
3. 06:45 AM - Re: wiring thre phase power (Robert L. Nuckolls, III)
4. 07:54 AM - Re: Transponder Antenna (Speedy11@aol.com)
5. 06:04 PM - Re: Robust transponder antennas (dgaldrich)
6. 06:51 PM - DIY transponder antenna (Mike Welch)
7. 07:54 PM - Re: DIY transponder antenna (Jim Wickert)
8. 08:01 PM - Re: DIY transponder antenna (F. Tim Yoder)
9. 08:38 PM - Re: DIY transponder antenna (Mike Welch)
10. 10:37 PM - Re: DIY transponder antenna (Etienne Phillips)
Message 1
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| Subject: | Re: Off topic -- Slowing an electric motor |
Dan, A PSC type motor can be safely slowed using a properly rated
dimmer. These dimmers are specially designed for this type of motor
and are NOT just lamp dimmers. Search for Lutron Fan Speed controls
and look for the fully variable type, not the 3 or 4 speed preset type
used for paddle fans.
-Bob Newman
----- Original Message -----
From: Dan O'Brien
To: AeroElectric-List@matronics.com
Sent: Wednesday, January 19, 2011 11:35 PM
Subject: ***SPAM*** AeroElectric-List: Off topic -- Slowing an
electric motor
I built a wind tunnel for my son=92s physics project. Works great!
The issue is that I would like to slow the fan down to generate airspeed
below the Reynolds number of a dimpled golf ball. Current airspeed is
about 58 mph. I need to slow the fan to generate airspeed below 30 mph.
The motor is a permanent split capacitor type:
http://www.grainger.com/Grainger/DAYTON-Direct-Drive-Blower-Motor-7E658.
Any thoughts on how to slow it down? I've read that slowing it with a
dimmer might damage the motor.
Thanks,
Dan O=92Brien
Message 2
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| Subject: | wiring thre phase power |
I am wiring a three phase vertical mill to a static converter (add a
phase) from my 220vac single phase source. The motor is a reversible
single speed. Does the order of the phases matter? The instruction with
the mill are Chinese version of English (useless) and the instructions
from the phase converter don't specify which leg goes where.
I know this is slightly off topic, but the mill is going in my hangar to
build airplane parts!
Chris Hukill
Message 3
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| Subject: | Re: wiring thre phase power |
At 09:28 AM 1/20/2011, you wrote:
>I am wiring a three phase vertical mill to a static converter (add a
>phase) from my 220vac single phase source. The motor is a reversible
>single speed. Does the order of the phases matter? The instruction
>with the mill are Chinese version of English (useless) and the
>instructions from the phase converter don't specify which leg goes where.
>
>I know this is slightly off topic, but the mill is going in my
>hangar to build airplane parts!
Not critical for the initial start-up. But
if the motor does not run the right direction
when you turn it on, reverse any two leads.
Bob . . .
Message 4
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| Subject: | Re: Transponder Antenna |
Should you do that, we will be very interested in the dimensions.
Stan
In a message dated 1/20/2011 3:06:48 A.M. Eastern Standard Time,
aeroelectric-list@matronics.com writes:
I might be able to sift through the
data and fabricate a test-article out of copper clad
and sneak it into the test lab. Once the dimensions
are known, there's probably a bunch of folks on
the list that could carve some aluminum.
Message 5
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| Subject: | Re: Robust transponder antennas |
I believe the antenna design in question is an approach to getting a VERY broad
range of frequency coverage (10-1) from a single antenna. Note also that it
was designed to operate from 30 to 30,000 MHz and the ATC transponder frequency
is a single one at 1090 Mhz.
You certainly don't need the broad coverage and are almost certainly better off
with a single blade or stub designed for 1090 MHz than this.
The antennae on the B-52 needed to cover almost DC to light (400 khz to 30 GHz)
and this design was very workable.
Ex B-52 Pilot
Dave Aldrich
do not archive
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327736#327736
Message 6
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| Subject: | DIY transponder antenna |
List members=2C
Would someone be kind enough to share a link or reference
for a guy to make his own transponder antenna? Preferably=2C a
site that lists the necessary materials=2C has some pictures=2C etc.
I'm real close to the point where I need to think about installing the
antenna for the transponder.
Thanks=2C
Mike Welch
Message 7
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| Subject: | DIY transponder antenna |
Mike,
On E-Bay you can purchase production built transponder antenna's for
anywhere from $15 to $20 in AS page 548, pt.no. 11-17995, 2009 cat. they
are $18.95..two ups shipments of pcs parts will be at least $12.00 to
$18.00 alone. ????? Take care build where it counts.
Jim Wickert
Vision #159 "Vision Some Will Have IT Some Will Not".
Tel 920-467-0219
Cell 920-912-1014
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Mike
Welch
Sent: Thursday, January 20, 2011 8:47 PM
Subject: AeroElectric-List: DIY transponder antenna
List members,
Would someone be kind enough to share a link or reference
for a guy to make his own transponder antenna? Preferably, a
site that lists the necessary materials, has some pictures, etc.
I'm real close to the point where I need to think about installing the
antenna for the transponder.
Thanks,
Mike Welch
Message 8
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| Subject: | Re: DIY transponder antenna |
Not much help, the simplest one I saw was made from an AN bolt of the
proper length.
I bet someone on the list will remember the source.
Tim
----- Original Message -----
From: Mike Welch
To: aeroelectric-list@matronics.com
Sent: Thursday, January 20, 2011 7:47 PM
Subject: AeroElectric-List: DIY transponder antenna
List members,
Would someone be kind enough to share a link or reference
for a guy to make his own transponder antenna? Preferably, a
site that lists the necessary materials, has some pictures, etc.
I'm real close to the point where I need to think about installing
the
antenna for the transponder.
Thanks,
Mike Welch
Message 9
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| Subject: | DIY transponder antenna |
Hi Jim=2C
I'm very familiar with the eBay ones=2C I just thought I could build my
own for a couple of bucks=2C but since you suggested it=2C I might as well
go ahead and get one of those off eBay. (I was seriously considering
the eBay one=2C anyway)
If no one else bids=2C I can buy it for $9.99. Add the $6 for the shippi
ng
and it comes in at $16 delivered. I have enough projects=2C I think I'll g
o the easy
route on this one=2C and buy one ready-made.
Thanks for the responses=2C guys.
Mike Welch
From: jimw_btg@earthlink.net
Subject: RE: AeroElectric-List: DIY transponder antenna
Mike=2C
On E-Bay you can purchase production built transponder antenna=92s for anyw
here from $15 to $20 in AS page 548=2C pt.no. 11-17995=2C 2009 cat. they a
re $18.95=85.two ups shipments of pcs parts will be at least $12.00 to $18
.00 alone. ????? Take care build where it counts.
Jim Wickert
Vision #159 =93Vision Some Will Have IT Some Will Not=94.
Tel 920-467-0219
Cell 920-912-1014
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectr
ic-list-server@matronics.com] On Behalf Of Mike Welch
Sent: Thursday=2C January 20=2C 2011 8:47 PM
Subject: AeroElectric-List: DIY transponder antenna
List members=2C
Would someone be kind enough to share a link or reference
for a guy to make his own transponder antenna? Preferably=2C a
site that lists the necessary materials=2C has some pictures=2C etc.
I'm real close to the point where I need to think about installing the
antenna for the transponder.
Thanks=2C
Mike Welch http://www.matronics.com/Navigator?AeroElectric-Listhttp://foru
ms.matronics.comhttp://www.matronics.com/contribution
Message 10
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| Subject: | Re: DIY transponder antenna |
Hi Mike
I built one out of a simple BNC panel mount connector (can't remember if it
was male or female), with a piece of coat-hanger wire soldered into the
crimping hole, all covered in red heatshrink with a ball of glue at the end
to prevent bleeding. It took less than 10 mins to make and cost about $5.
Here's an example BNC:
http://za.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=6807361
I have an aluminium skin which acts as a nice ground-plane, and I've had no
issues whatsoever with the transponder in 2 years of operation, at an
airfield that makes you come back and land if your Mode C isn't working!
I also know of one person that just strips the coax and lets the protruding
inner core of the correct length dangle in the wind with the shield attached
to the skin with a lug and bolt. It also works for him, although it
terrifies me :-)
Hope that helps!
Etienne
On 21 January 2011 06:27, Mike Welch <mdnanwelch7@hotmail.com> wrote:
> Hi Jim,
>
> I'm very familiar with the eBay ones, I just thought I could build my
> own for a couple of bucks, but since you suggested it, I might as well
> go ahead and get one of those off eBay. (I was seriously considering
> the eBay one, anyway)
>
> If no one else bids, I can buy it for $9.99. Add the $6 for the shipping
>
> and it comes in at $16 delivered. I have enough projects, I think I'll go
> the easy
> route on this one, and buy one ready-made.
>
> Thanks for the responses, guys.
>
> Mike Welch
>
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