Today's Message Index:
----------------------
1. 05:17 AM - Re: Boost pumps (Joe)
2. 05:35 AM - Re: Loran to VHF (Robert Feldtman)
3. 09:24 AM - Re: Boost pumps (Dennis Jones)
4. 11:14 AM - Re: Loran to VHF (Robert L. Nuckolls, III)
5. 11:16 AM - Re: DB25 tap adapter (Robert L. Nuckolls, III)
6. 08:11 PM - Z13-8b Brown Out Relay Question ? (Bill Schlatterer)
Message 1
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Jonsey,
You can switch either the hot wire or the grounded wire. The fuel pump
doesn't care. One method might have an advantage over the other as far
as the length of the wires (weight) goes, and thus the length of hot
wire exposed to possible short circuits. As long as the hot wire is
protected by a fuse and is protected against mechanical damage, it will
not matter much how the fuel pump is switched.
Joe G.
Message 2
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| Subject: | Re: Loran to VHF |
the LORAN antenna won't work. put "dipole calculator" in google and you will
get several automatic calculators for figuring dipole length. put in your
frequency and it will give you dipole length - probably about 40 inches or
so, take a piece of wire that length, cut in half, solder one end to center
conductor and the other end to the shield of rg-58U and you have an antenna.
go to RST and they have the formula, they also sell toroids, you could slip
on over the coax and that will act like a balun - would take 10 mins to
make... mount it "vertical" for vertical polarization - although at an
airshow it won't matter.
bobf
W5RF
glastar
On Thu, Jun 12, 2008 at 9:38 PM, B Tomm <fvalarm@rapidnet.net> wrote:
>
> Thanks Bob,
>
> I was considering shortening (tuning) a used Loran antenna for use with a
> VHF aircraft radio as a base station for a local airshow coming up. The
> regular 50 ohm coax would be used to feed it.
>
> Bevan
>
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert
> L.
> Nuckolls, III
> Sent: Thursday, June 12, 2008 3:35 PM
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: Loran to VHF
>
> --> <nuckolls.bob@cox.net>
>
> At 09:12 AM 6/11/2008 -0700, you wrote:
> >--> <fvalarm@rapidnet.net>
> >
> >
> >Bob,
> >
> >Can a Loran antenna (CI 121 SP) be converted/trimmed into a VHF Comm.
> >antenna?
> >
> >Thanks
>
> Probably not. LORAN is a low frequency (100 KHz) facility
> that could NEVER benefit from a tuned antenna on a vehicle. Just
> too long. So these antennas tend to be like those used
> on another low frequency (550 to 1700 KHz) system, AM
> entertainment radio. The "coaxial" cable is really a very
> low capacitance, shielded cable designed to minimially
> load a short, e-field antenna that delivers a relatively
> weak signal due to it's Lilliputian dimensions.
>
> Certainly you can adjust the length of the LORAN antenna
> to make it resonant at VHF comm frequencies but the
> coaxial cable associated with the antenna may very well
> be the low-capacity wire I described. My sense is that you'll
> spend so much time modifying the antenna and then proving
> that you did a good thing that you're $time$ ahead just
> to put a real VHF antenna in from the get-go.
>
> Bob . . .
>
>
> ----------------------------------------)
> ( . . . a long habit of not thinking )
> ( a thing wrong, gives it a superficial )
> ( appearance of being right . . . )
> ( )
> ( -Thomas Paine 1776- )
> ----------------------------------------
>
>
Message 3
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Thanks Joe
I did find that with the smoke pump it took less wire and the hot wire
is considerably shorter. I will look at this situation knowing either
way would work.
Jonsey
----- Original Message -----
From: Joe
To: aeroelectric-list@matronics.com
Sent: Friday, June 13, 2008 7:13 AM
Subject: Re: AeroElectric-List: Boost pumps
Jonsey,
You can switch either the hot wire or the grounded wire. The fuel
pump doesn't care. One method might have an advantage over the other as
far as the length of the wires (weight) goes, and thus the length of hot
wire exposed to possible short circuits. As long as the hot wire is
protected by a fuse and is protected against mechanical damage, it will
not matter much how the fuel pump is switched.
Joe G.
Message 4
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At 07:38 PM 6/12/2008 -0700, you wrote:
>
>Thanks Bob,
>
>I was considering shortening (tuning) a used Loran antenna for use with a
>VHF aircraft radio as a base station for a local airshow coming up. The
>regular 50 ohm coax would be used to feed it.
>
>Bevan
That will probably work just fine.
Bob . . .
Message 5
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| Subject: | Re: DB25 tap adapter |
At 10:06 PM 6/12/2008 -0400, you wrote:
>All,
>
>I had the need to create a simple Tap for a DB25 connector. I decided to
>try out a new board house and have lots available. These make a great way
>to Y into anything that uses a DB25 connector. E.g.GPS, or other
>signals. They are very simple to use, you just unconnect your existing
>db25 and plug this in-between. Screws and nuts can be picked up easily at
>Frys or RS.
>
>I will supply them with connectors - either 2 males, 2 females or 1 of
>each - your choice. The board presses between the solder cups and then
>you solder the connectors to the little board. The board has a tap point
>for each pin number and it's only .5 inches wide. The entire connector is
>only 1.5" wide when assembled. The via's will take up to 20ga wire and
>should support anything that we might need.
>
>I'll sell these for $5 each or $8 for a pair (2 full sets) + $2 S/H (usps)
>to anywhere in the US (international if needed will be actual postage or a
>negotiated rate).
>
>If interested, drop me a note with qty, gender, and I'll provide paypal
>information for purchase and get them shipped right out.
>
>I've attached pictures for your reference, if those don't go thru, you can
>see them here.
>
><http://www.highrf.com/Rockets/db25/DSCN2109_edited-2.jpg>http://www.highrf.com/Rockets/db25/DSCN2109_edited-2.jpg
>http://www.highrf.com/Rockets/db25/DSCN2111_edited-2.jpg
><http://www.highrf.com/Rockets/db25/DSCN2114_edited-1.jpg>http://www.highrf.com/Rockets/db25/DSCN2114_edited-1.jpg
>
>my email is adamson (underscore) alan at hotmail dot com
>
>As a side note, I'm tempted to do the same for db9 and db15 connectors...
>we'll see, I suppose if there is enough demand, I could do the big db
>connectors too (37 pin is it?).
Yes, 37 pins is the next size up. Good lick on these
sir. I've used this technique many times over the
years with good success. I've also done versions where
the intermediate board mounted another d-sub connector
(with pc pins) and versions where the tap connector
was a mass-terminated ribbon cable header.
This is a well tried and proven technique.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 6
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| Subject: | Z13-8b Brown Out Relay Question ? |
Bob, I am having a little trouble understanding the charging circuit for the
7ah battery in Z13-8b. What I see is that the normal E-Bus Alt Feed path is
in place to activate the Aux Bat if needed to the Endurance bus. The
Brown-Out Battery Relay is normally energized by the starter circuit which
disconnects the Aux Bat while starting but leaves it in the circuit for
normal charging at all other times.
What I don't understand is why you would use a S701-4 relay instead of a
simple D25 steering diode which has no moving parts? Isn't this the same
thing we are doing with the diode between the E-Bus and the Main Bus
(allowing a one way current flow)? Is there some advantage in using the
relay over the diode in this "brown-out battery relay" position?
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z13-8B(BrownOutBatte
ry).pdf
Thanks Bill S
7a finishing
Z13/8/32/35
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