Today's Message Index:
----------------------
1. 07:53 AM - RF connector - (John Tvedte)
2. 09:57 AM - Flap Switch Protection (Terry Frazier)
3. 10:13 AM - Rev 11, page 14-17, fig 14-11 Question (Palvary)
4. 10:26 AM - KX-165 Transmit light always on (Palvary)
5. 01:01 PM - Re: Flap Switch Protection (Vernon Little)
6. 01:05 PM - Re: Flap Switch Protection (Greg Scott)
7. 04:24 PM - Re: Flap Switch Protection (Robert L. Nuckolls, III)
8. 04:49 PM - Re: Rev 11, page 14-17, fig 14-11 Question (Robert L. Nuckolls, III)
9. 07:43 PM - Re: Know Your Charging System article (Robert L. Nuckolls, III)
Message 1
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Wondering if anyone knows the part # (I assume it's a Delta RF part) for Ga
rmin's P/N 162-0098.
It's a optional BNC connector that can be used on the SL30, etc - that repl
aces the std. issue clamp style.
Thanks,
John
Message 2
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| Subject: | Flap Switch Protection |
I'm using Van's electric flap motor with a on-off-(mom)on dpdt switch. I'm
looking for a protection config. for the switch similar to that used on the
battery/starter contactors. Found one diagram on the web using two (Zeiner?)
15V diodes opposing each other across the motor wires, but I don't know the
pedigree of the design. Is there a better way to do this, and if not will a
zeiner diode setup do what I'm trying to do - protect the switch?
Thanks in advance,
Terry Frazier
7A Finishing & Panel
Message 3
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| Subject: | Rev 11, page 14-17, fig 14-11 Question |
Hi All,
I'm new to this group. I'm trying to refurbish an experimental I
recently purchased and am hoping I can get some help on this group.
I have Bob's Rev 11 book and am using it to instrument my four cylinders
for CHT monitoring. As a stop gap measure, I'll be using a rotary switch
with one EGT meter. Looking at View B of figure 14-11, either there is
an error in printing or I'm missing something. It seems to me the wiring
should be perfectly symmetrical. IF the middle thermocouple chromel goes
to the lower point of one switch, then the corresponding alumel should
go to the same location on the other (ganged )switch. I just don't see
it drawn that way, am I wrong here?
--Jose
Message 4
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| Subject: | KX-165 Transmit light always on |
Any King radio experts on this list?
My KX-165 radio seems to be transmitting and receiving Ok. However, the
transmit light never seems to fully go off. When I push the PTT button
the "T" light gets brighter, but then simply dims during receiving. It
is not a stuck mike switch or I wouldn't be able to receive. I've
cleaned the radio's edge connector and I've removed the intercom from
the circuit. No effect. I have not yet been able to power up the radio
independently to see if the light still stays on.
I have 2 PTT buttons in parrallel and they are simple SPDT to make/break
the mic key line. Could it be that the KX165 needs to have both the mic
audio and key lines switched with a DPDT? Could a missing ground on the
braid to these wires have this effect on the transmit light?
Thanks for your thoughts,
Jose
Message 5
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| Subject: | Flap Switch Protection |
That's my design. Probably better to use a bidirectional Transzorb, but the
Zener's are what I had on hand. If I do it again, I'd use a single P6KE16CA
(available from DigiKey). A larger voltage rating is ok as well, just don't
go lower (in a 12 volt system).
Having said that, I've never heard of anyone burning out a switch with a
Van's flap motor. I think the total stored energy is low compared to a
contactor coil, for example.
Vern Little
-----Original Message-----
I'm using Van's electric flap motor with a on-off-(mom)on dpdt switch. I'm
looking for a protection config. for the switch similar to that used on the
battery/starter contactors. Found one diagram on the web using two (Zeiner?)
15V diodes opposing each other across the motor wires, but I don't know the
pedigree of the design. Is there a better way to do this, and if not will a
zeiner diode setup do what I'm trying to do - protect the switch?
Thanks in advance,
Terry Frazier
7A Finishing & Panel
Message 6
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| Subject: | Re: Flap Switch Protection |
Terry,
You do not need any switch protection for the Van's Flap motor. The master
and starter solenoids are a different thing thing alltogether. The solenoids
when energized produce a strong electromagenetic field that collapes when
de-energized. This collapsing field causes a reversed EMF that will arc
across the opening contacts eroding them in the process. A diode is
connected across the coil terminals to provide a path for this EMF,
therefore protecting the switch contacts. You named the diodes as "Zeiner"
incorrect, they are Zener diodes, their useful characteristic is their
ability be non conducting in one direction only up to a designed (different
value Zeners) voltage at which point they conduct readily. They are useful
for Over Voltage protection circuits with the addition of a few more
components. They will monitor a voltage level which if goes over the design
voltage the Zener will conduct and trip the circuit protection, a circuit
breaker or fuse.
Hope this has been helpful,
Greg Scott
RV 4 UK reg. G - RVIV
RV9 under construction
----- Original Message -----
From: "Terry Frazier" <fraziernv@earthlink.net>
Sent: Monday, February 11, 2008 5:43 PM
Subject: AeroElectric-List: Flap Switch Protection
> <fraziernv@earthlink.net>
>
>
> I'm using Van's electric flap motor with a on-off-(mom)on dpdt switch.
> I'm
> looking for a protection config. for the switch similar to that used on
> the
> battery/starter contactors. Found one diagram on the web using two
> (Zeiner?)
> 15V diodes opposing each other across the motor wires, but I don't know
> the
> pedigree of the design. Is there a better way to do this, and if not will
> a
> zeiner diode setup do what I'm trying to do - protect the switch?
>
> Thanks in advance,
>
> Terry Frazier
> 7A Finishing & Panel
>
>
>
Message 7
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| Subject: | Re: Flap Switch Protection |
At 09:43 AM 2/11/2008 -0800, you wrote:
><fraziernv@earthlink.net>
>
>
>I'm using Van's electric flap motor with a on-off-(mom)on dpdt switch. I'm
>looking for a protection config. for the switch similar to that used on the
>battery/starter contactors. Found one diagram on the web using two (Zeiner?)
>15V diodes opposing each other across the motor wires, but I don't know the
>pedigree of the design. Is there a better way to do this, and if not will a
>zeiner diode setup do what I'm trying to do - protect the switch?
PM motors are not very "inductive" . . . the
switch used to control this motor would not
benefit from a protective device like a transorb
or zener.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 8
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| Subject: | Re: Rev 11, page 14-17, fig 14-11 Question |
At 12:56 PM 2/11/2008 -0500, you wrote:
>Hi All,
>I'm new to this group. I'm trying to refurbish an experimental I recently
>purchased and am hoping I can get some help on this group.
>
>I have Bob's Rev 11 book and am using it to instrument my four cylinders
>for CHT monitoring. As a stop gap measure, I'll be using a rotary switch
>with one EGT meter. Looking at View B of figure 14-11, either there is an
>error in printing or I'm missing something. It seems to me the wiring
>should be perfectly symmetrical. IF the middle thermocouple chromel goes
>to the lower point of one switch, then the corresponding alumel should go
>to the same location on the other (ganged )switch. I just don't see it
>drawn that way, am I wrong here?
Good eye . . . in fact, someone else pointed that out to
me some years ago. I found a revised but un-posted errata
page for Figure 14-11 on the hard drive. It's been posted
to:
http://aeroelectric.com/articles/Rev11/Figure_14-11_REV12-16-02.pdf
Thanks for the heads-up.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 9
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| Subject: | Re: Know Your Charging System article |
At 09:14 PM 2/9/2008 -0800, you wrote:
>
>I recently ran across this article regarding aircraft alternator operation
>and charging systems.
>
>http://www.nflite.com/ChargingSystem.html
>
>If you scroll down past the general explanations, there is a section
>titled "Don't overload the system!".
>
>The short story is that the author recommends starting the engine with ALT
>field off so as to not overload the charging system and/or put undue
>strain on the diode rectifier. Is there anything to this theory?
>
>Regards,
>Jay
Yeah, that idea surfaces from time to time. It's
been promulgated by a lot of folks who don't
understand the physics of alternator performance.
I've reviewed the article and posted some comments
at:
http://www.aeroelectric.com/_temp/Know_Your_Charging_System.pdf
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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