Today's Message Index:
----------------------
1. 07:16 AM - Re: SL30 intercom function (user9253)
2. 07:29 AM - Re: SL30 intercom function (Roger & Jean Curtis)
3. 08:05 AM - Re: Re: Removable comm antenna (D L Josephson)
4. 08:05 AM - Re: Re: SL30 intercom function (Charlie England)
5. 09:03 AM - Re: Re: Removable comm antenna (Robert L. Nuckolls, III)
6. 10:24 AM - Re: Re: Removable comm antenna (Holger Selover-Stephan)
7. 10:39 AM - Re: Re: Removable comm antenna (BobsV35B@aol.com)
8. 11:10 AM - AeroElectric Connection Seminar Brodhead, WI, April 13-14, 2013 (Robert L. Nuckolls, III)
9. 12:03 PM - Re: SL30 intercom function (user9253)
10. 04:23 PM - LARAGO ELT info needed (Charlie England)
Message 1
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| Subject: | Re: SL30 intercom function |
Looking at the schematic for the AMX-4A/4B referenced above.
http://107.22.231.30/redmine/attachments/download/58/Schematic-AMX-4A.pdf
I do not understand the resistor value 180R *100K.
The first thought that comes to mind is 180K ohm. But if you multiply 180 ohms
by 100,000, it comes to 18,000,000, which seems too big.
I understand other resistor values on the schematic. For instance, 1M6 is 1.6M
ohms. And 560R is 560 ohms. But 180R *100K and 1K0 *150R have me confused.
Joe Gores
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=390524#390524
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| Subject: | SL30 intercom function |
>Do you know if the intercom input can be on (grounded) continuously, even
>during txm?
I think it can
Thanks Bob
Roger
Do not Archive
Message 3
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| Subject: | Re: Re: Removable comm antenna |
> Bob, many thanks for explaining it in detail. With your suggestions in
> mind, I picked up some parts I had laying around and put this together:
> https://www.dropbox.com/sh/rylqm9cect5ndut/XyaFh-jLE2
>
> I'll have to find someone with an SWR meter and cut it to the proper
> length. Then we'll see if it actually does what it's supposed to do. But
> it's solid, and removed in seconds.
Holger, that looks fine. If everyone were as able to deal with a small
machining project like that as you are, there wouldn't be so many
lashed-up antennas out there. An SWR check will be useful but don't be
too worried about it. You should expect better than 2:1 over a range of
a few MHz. Trim the length so the center of this range is the center of
the range of frequencies you normally use.
Message 4
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| Subject: | Re: SL30 intercom function |
On 12/16/2012 09:15 AM, user9253 wrote:
>
> Looking at the schematic for the AMX-4A/4B referenced above.
> http://107.22.231.30/redmine/attachments/download/58/Schematic-AMX-4A.pdf
> I do not understand the resistor value 180R *100K.
> The first thought that comes to mind is 180K ohm. But if you multiply 180 ohms
by 100,000, it comes to 18,000,000, which seems too big.
> I understand other resistor values on the schematic. For instance, 1M6 is 1.6M
ohms. And 560R is 560 ohms. But 180R *100K and 1K0 *150R have me confused.
> Joe Gores
>
> --------
> Joe Gores
Only a quick look at it, but I think that he's showing two optional
values for a set of resistors. One set of values is for 'normal' output
(AMX-4A) & the other, asterisk labeled, is for high output (AMX-4B).
The 'normal' output resistor set is actually an attenuator.
Charlie
Message 5
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| Subject: | Re: Removable comm antenna |
>
>Bob, many thanks for explaining it in detail. With your suggestions
>in mind, I picked up some parts I had laying around and put this
>together: https://www.dropbox.com/sh/rylqm9cect5ndut/XyaFh-jLE2
>
>I'll have to find someone with an SWR meter and cut it to the proper
>length. Then we'll see if it actually does what it's supposed to do.
>But it's solid, and removed in seconds.
Nice work! I'd like to add your photos to the archives on
aeroelectric.com.
Help me out a bit . . .
Emacs!
It appears that your coax center conductor
is attached to the 4-bolt flange (pop rivet?)]
which in turn is insulated from the mounting
bolts with a combination of insulating bushings
and washers. Where does the coax shield find
connection to the groundplane/skin?
It's not clear how the antenna element is retained
on the aircraft/
As D.L. suggested, SWR isn't a terribly critical concern.
If you cut it for an overall length from skin to tip
of 22", you're going to be close enough for government
work.
It would be interesting to see a plot of your measured
SWR over the range of interest at say 1 Mhz steps. If
you've got better things to do on your airplane, don't
let this academic exploration get too high on the list
of priorities.
Bob . . .
Message 6
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| Subject: | Re: Removable comm antenna |
On 12/16/12 9:02 AM, Robert L. Nuckolls, III wrote:
> It appears that your coax center conductor
> is attached to the 4-bolt flange (pop rivet?)]
> which in turn is insulated from the mounting
> bolts with a combination of insulating bushings
> and washers. Where does the coax shield find
> connection to the groundplane/skin?
>
> It's not clear how the antenna element is retained
> on the aircraft/
D.L., Bob, thanks again! I'll go with 22 inches until I find someone
with a SWR meter. If this person and I can get the data for the plot, I
will send it to you, Bob.
That's correct, the coax center is attached to that rectangular flange
with a PIDG terminal. There is a threaded hole in the flange for it. The
flange is welded to a SS tube that receives the antenna rod. As you
said, the flange and tube is insulated against ground. I measured for
conductivity. There is a spring in the tube, just to make sure there's
good contact.
The coax shield is connected to ground a few inches away. I left that
unchanged from the previous whisker antenna installation.
That riveted skin doubler is the result of my damaging the original
antenna on the ground. Not going to happen anymore. But the main thing
is, I can now sew a full cover to keep it dry outside, and won't have to
put it on a trailer when a bit of wet weather is moving in. Means more
flying for me! :))
Thanks,
Holger
Message 7
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| Subject: | Re: Removable comm antenna |
Good Afternoon Holger,
Great workmanship! What I really love is that V-Tail. <G> What kind of a
machine is it?
Happy Skies,
Old Bob
Downers Grove, Illinois
V-Tail Aficionado
In a message dated 12/16/2012 12:25:01 P.M. Central Standard Time,
holger-d@shadowbrush.com writes:
--> AeroElectric-List message posted by: Holger Selover-Stephan
<holger-d@shadowbrush.com>
On 12/16/12 9:02 AM, Robert L. Nuckolls, III wrote:
> It appears that your coax center conductor
> is attached to the 4-bolt flange (pop rivet?)]
> which in turn is insulated from the mounting
> bolts with a combination of insulating bushings
> and washers. Where does the coax shield find
> connection to the groundplane/skin?
>
> It's not clear how the antenna element is retained
> on the aircraft/
D.L., Bob, thanks again! I'll go with 22 inches until I find someone
with a SWR meter. If this person and I can get the data for the plot, I
will send it to you, Bob.
That's correct, the coax center is attached to that rectangular flange
with a PIDG terminal. There is a threaded hole in the flange for it. The
flange is welded to a SS tube that receives the antenna rod. As you
said, the flange and tube is insulated against ground. I measured for
conductivity. There is a spring in the tube, just to make sure there's
good contact.
The coax shield is connected to ground a few inches away. I left that
unchanged from the previous whisker antenna installation.
That riveted skin doubler is the result of my damaging the original
antenna on the ground. Not going to happen anymore. But the main thing
is, I can now sew a full cover to keep it dry outside, and won't have to
put it on a trailer when a bit of wet weather is moving in. Means more
flying for me! :))
Thanks,
Holger
Message 8
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| Subject: | AeroElectric Connection Seminar Brodhead, WI, April |
13-14, 2013
I'm pleased to announce that EAA Chapter 431 . . .
http://tinyurl.com/cth5woc
. . . of Brodhead, WI has offered their facility as a
gathering place for an AeroElectric Connection weekend
seminar next spring.
The chapter has also graciously offered to underwrite
the tuition for this presentation to the tune of $35 per
attendee. It's been awhile since Dr. Dee and I have had
an opportunity to travel to the hinterlands to meet with
our readers and share our time, talents and resources.
Students and second attendees of a partnership build may
attend for 1/2 price. Spouses may attend free.
Bring pictures of your projects, particularly in .jpg form.
Also, bring any specialty tools you may have acquired and
are wondering if they're applicable to your task. This seminar
is in driving radius of home so we'll be able to bring more
hands-on demonstration hardware than would normally be carried
aboard ATC aircraft.
The sign-up page has been posted to the AeroElectric Connection
website at:
http://tinyurl.com/9v9ffcq
Bob . . .
Message 9
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| Subject: | Re: SL30 intercom function |
Thanks Charlie,
If I would have looked closer, I would have realized that was an asterisk referring
to a note, not a multiplication sign. :-)
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=390547#390547
Message 10
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| Subject: | LARAGO ELT info needed |
Anyone recognize this ELT, or the antenna connector used? The antenna is
missing, & the owner needs either an original 'fixed' antenna, or an
adapter to a regular BNC connector/cable for an external antenna. He has
the telescoping accessory antenna, but his IA won't sign off the plane
with only that antenna.
Thanks,
Charlie
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