Today's Message Index:
----------------------
1. 07:12 AM - Re: Servo problem (Robert L. Nuckolls, III)
2. 07:43 PM - Yippee! (Marty Mason)
3. 08:40 PM - Re: Yippee! (joe motis)
4. 08:59 PM - Re: Com and Nav Radio and Antenna Questions (Don)
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: | Re: Servo problem |
At 11:36 AM 2/20/2012, you wrote:
Hi Bob
Thanks for the advice, and the solution! I
installed a Pi filter only on the signal line,
but with components of 100pF and 10uH, as that's
what was available. The power line didn't seem to
be affected by the noise, so I decided to try
just the signal line first, then add the power line filter if required.
Good show.
<snip>
Thanks also for the offer of crafting a more
elegant solution. Since the filter is so simple
to fabricate, and seems to work in this really
abusive environment, I wonder if it's even
necessary? With plugs and attachments it'll
probably be unwieldy to install in such a small spot.
It wouldn't necessarily have any plugs, only
attach pads for wires. I envision an ECB perhaps
0.7" x 1.0" that would accommodate surface mount
components on one side leaving the other flat.
Holes in the corners would let you solder-thru
to attach the board directly to the outside copper
foil on the actuator while simultaneously grounding
the filter to the foil.
Wires would come off each end. They would, of course,
be strain relieved with adhesive or perhaps tied
down with another layer of copper tape over the whole
filter/wiring installation.
Pretty small and low profile.
In any case, it looks like your dragon has been
held at bay.
Bob . . .
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 |
|
I hope u like it http://www.markspeterson.com/message.php?Diane This really works!
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 |
|
"Yippee" The five thousandth Lockheed P 38 built and painted in a stunning
vermillion orange. Nothing Canadian about it Built right here in sunny
SoCal.
On Wed, Feb 22, 2012 at 7:39 PM, Marty Mason <captainmarty@bellsouth.net>wrote:
> captainmarty@bellsouth.net>
>
>
> I hope u like it http://www.markspeterson.com/message.php?Diane This
> really works!
>
>
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: | Com and Nav Radio and Antenna Questions |
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Monday, February 06, 2012 6:21 PM
Subject: RE: AeroElectric-List: Com and Nav Radio and Antenna Questions
<nuckolls.bob@aeroelectric.com>
At 07:20 PM 2/5/2012, you wrote:
This will not break the bank, will purchase one. It does not mention
the ability to excite the feedline and antenna for setting up vor so
U will need help in doing that.
This is a self contained antenna analyzer. It features
a variable frequency oscillator that provides a test
signal source over a 2 to 170 Mhz range. There is a
counter that displays the oscillator's present frequency.
Finally, there is an array of detectors upon which a
ratiometric analysis is conducted to deduce the resistive
and reactive components of the antenna and display them.
Instruction manual can be found here:
http://www.mfjenterprises.com/pdffiles/MFJ-259B.pdf
While not a laboratory grade instrument, it's
a lot of bang for the buck.
The wingtip antenna you talk about in the connection is a slightly
modified Archer. Archer mounts them to the fiberglass wing tip and
sandwiches it between the glass and the wing root for the ground. I
am looking for the instructions that came with the unit and will send
them to you as soon as I find them.
Yeah, Bob was a little incensed when the folks
at Van's published dimensional details on his
first RV wingtip offerings (and I repeated them
in the 'Connection). Bottom line is that the antenna
is simply a gamma-matched monopole of which there
are many variations on a theme. The now arcane
'sled runner' marker beacon antennas on the belly
are a good example.
Once you have an MFJ259 in hand, you can both
trim overall length of the Archer design to
desired center frequency,
Shorter for higher center freq? If I need longer can I just rivet on an
extension?
you could also adjust
the gamma-match and tuning capacitor for optimum
performance too.
Is this done by just increasing or decreasing the plate size where the
center conductor attaches? Is this checked with the
Percent match function on the MFJ259B?
While this might be an intellectually satisfying
exercise (Hams can get downright pedantic in
their quest for the Holy-SWR), it would be hard
to observe much difference in performance between
an Archer cookie-cutter installation and one that
has be tuned to technical Nirvana.
I would like to be able to get one of these. To work in each wing
tip for my two vors. I have an APRS (2meter Jpole in one wingtip
that may make it impossible to get the Archer to work.
Why a j-pole? That's an awfully big antenna for
a line-of sight application. Why not the simple
vertical whisker?
I will ask the additional questions after I send you the Archer
instructions.
Got the data package. What's your question?
Bob . . .
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! --
|