Today's Message Index:
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0. 07:19 AM - Value of the List... (Matt Dralle)
1. 08:01 AM - Re: Transponder Antenna issue... (Robert L. Nuckolls, III)
2. 08:10 AM - Re: Re: Transponder antenna ()
3. 12:35 PM - Re: z13/8 ess bus feed (mmcelrea)
4. 02:54 PM - Alarm souder with multiple sources (Achille)
5. 05:37 PM - Re: Transponder Antenna (Andrew Meyer)
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Subject: | Value of the List... |
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Message 1
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Subject: | Re: Transponder Antenna issue... |
At 04:56 PM 11/22/2017, you wrote:
>The other option that I'm considering is a Sim Jim antenna far up in
>the nose to the left - as far past the battery as I can get it or in
>the right wing root - about 4 feet to the right of the pink bag of
>fluid that manipulates the controls... I do want it out of the wind
>because any drag at 170 knots with only 50 or 60 HP pushing at
>altitude makes a BIG difference.
>
><https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/>https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/
>
>Set the velocity factor at about .94 with 14 gauge solid (house)
>wire and tune at 1060MHz (half way in between 1030 and 1090.) I use
>one of these for my Stratux ADS-B and get 200+ mile returns from
>aircraft... Any thoughts on how to do this better?
The 'slim jim' is a 3/4 wave assembly consiting
of a 1/2 wave, end fed dipole and a 1/4 wave
matching section. Bob Archer designed and sold a 1/2 wave,
gamma matched dipole suitable for mounting
on inside surface of a glass and plastic airplane . . .
2/3 the length of a 'slim jim'. I think ACS still
sells this antenna.
Bob . . .
Message 2
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Subject: | Re: Transponder antenna |
So the noise is breaking intercom squelch?
I=99ve noticed that in many EZ type installations, the transponder
RF =9Cclicking=9D noise is actually getting in to the
headset itself. Especially if it is the active noise canceling variety.
It didn=99t seem to matter what intercom was being used, VOX
system shielding, ground separation and even ferrite chokes added to the
power/coax/audio lines...or even transponder. In one case I could even
unplug the headset and still get the noise.
Mostly, I found that I can get the intensity of the noise to change (and
even disappear in some positions) as I rotate my head (with headset on)
or move to different parts of the cabin and/or moving the control box
around. It can be replicated on the ground as well if you are in an
active surveillance area and can get your transponder to be active.
Try that and using a different brand and type of headset and see if you
have similar results. If so, there is not much you can do about it but
change headset vendor/type if you find a quiet one or increase the size
of the ground plane if you have the room =93 which is quite
limited in an EZ.
Let us know what you find.
-James
Berkut/Race 13
From: Steve Stearns
Sent: Monday, November 13, 2017 8:43 AM
Subject: Re: AeroElectric-List: Re: Transponder antenna
*IF* you are or will be using an ADS-B out 1090 MHz transponder on the
antenna in question be aware that it's output is enough different than
the non-ADS-B transponder that where the later would work with no
problem, the former may inject "ticks" into your audio.
I've debugged enough to be *quite* certain that the interference path is
from the energy radiated off of the antenna itself into the mic
circuitry on my panel mount Sigtronics intercom.
Message 3
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Subject: | Re: z13/8 ess bus feed |
Is it acceptable to use cb's, fuses or limiters in place of the fuse links from
the stby alternator, main bus to master and the alternate essential bus feed?
Also is it ok to use 1 amp fuses in place of fuse links from the shunts on a
G3X system?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=475590#475590
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Subject: | Alarm souder with multiple sources |
Good day !
I need some help to wire an alarm (souder and one red light) with multiple sources.
I have my ignition sending a signal on an exit to power up an alarm souder up to
75ma, I want to use a sounder, and first of all I would like to set it with
also on the same alarm (warning and led) a low oil pressure sensor, a low fuel
level alarm. I was thinking about to use diode, but wich kind on diode could
I use for this use ? (Because I have a big diode to power my essential bus from
my main bus. And I will not set this kind of diode right ?)
Also, as master warning on other plane i want to be allowed to cancel the alarm.
(Switch to push with instable position, to mute it) For exemple before start
I will have after power up, the alarm (low pressure) and i don't want to stay
with my Alarm all time that I will take an ATIS for exemple, but it's the same
during a faillure.
And this point it's a bit difficult for me. I have wired a similar thing on a motor
home there was 10 years.. but 10 years after. I don't remember how I wired
it, just that I used relays.
Anyone could Help me ?
Thank you.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=475593#475593
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Subject: | Re: Transponder Antenna |
Bob, etc all.,
Thank you.
For the short term, I bought a piece of 1/8" brass rod, turned down and
soldered the old connector to this rod, put the ball on the end and
installed... Going to test fly tomorrow. Matched the length, etc...
I will explore the internal options shortly. Slowly getting rid of drag.
Need to do it faster though.
Happy Flyin'!
Andy
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