Today's Message Index:
----------------------
1. 09:07 AM - Re: Intermittent no radio reception (Ed Holyoke)
2. 09:40 AM - Source for new Aerostart connectors? (Robert L. Nuckolls, III)
3. 04:00 PM - Re: Source for new Aerostart connectors? (David Lloyd)
4. 10:09 PM - Re: Ignition Interference (messydeer)
Message 1
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| Subject: | Re: Intermittent no radio reception |
Howdy Bill,
You don't have to change the squelch setting for the radio to suddenly
start receiving. All you have to do is increase the signal strength.
Flying closer or climbing could do it. If the squelch is set too high,
it'd seem to you as if there was no transmission at all until the signal
got strong enough to break through. If the radio has auto-squelch, that
can only be reset by the shop, I think. On a radio with manual squelch,
I adjust it till it will not quite break squelch with nobody
transmitting. Then pretty much any signal at all will break it.I check
it on every flight because conditions change. Only takes a second and I
know that I'm not missing anything that I could actually hear.
I often use the squelch on my #2 radio to keep the noise down on ATIS
until I have some open air and time to listen to it. I'll also set it
higher than normal so that when I get close enough that the weak signal
from ATIS can be understood, it breaks the squelch and reminds me to
listen to it.
I hope your problem is as simple as that. Makes it easy to solve. ;-)
Pax,
Ed Holyoke
On 5/13/2012 12:53 PM, Bill Bradburry wrote:
>
> Ed,
>
> I don't think so. I didn't change it between the works and don't work
> phases...??
>
> Bill
>
> ------------------------------------------------------------------------
>
> *From:*owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] *On Behalf Of
> *Ed Holyoke
> *Sent:* Sunday, May 13, 2012 12:37 PM
> *To:* aeroelectric-list@matronics.com
> *Subject:* Re: AeroElectric-List: Intermittent no radio reception
>
> Squelch set too high?
>
> Ed Holyoke
>
> On 5/12/2012 9:15 AM, Bill Bradburry wrote:
>
> --> AeroElectric-List message posted by: "Bill Bradburry"<bbradburry@bellsouth.net> <mailto:bbradburry@bellsouth.net>
>
> I had a problem with my radio reception today and I am not certain where to
> look for the cause. I was flying and the radio was working fine. I was
> listening to Approach while I flew around and I could hear them fine. I
> decide to land, so I dialed in ATIS. I didn't get anything. I noticed that
> I didn't have the "RX" showing on the radio. At the time I was about 25
> miles away and 2K feet. I thought maybe I was too low and far away,
> although I had been listening to Approach when I dialed in ATIS. As I got
> closer, I climbed a little and suddenly I could hear them so I didn't think
> much more about it. But I am pretty sure that I should have been able to
> hear them because I could almost see the airport from where I was.
>
> After I contacted approach and was handed off toSanford tower, I didn't
> hear from the tower for several minutes, then they asked me "how do you
> hear?". I replied "Fine". I didn't think much more about that incident
> either, but after I got home, I listened to the tower archives and I found
> that the tower had asked me 4 times how do you hear and I only heard the
> last one.
>
> This makes me feel that I have some kind of intermittent problem with
> receive. Everything else was working on the radio that I know of. It seems
> to be just an intermittent receive problem. Do you have any ideas where I
> should look for something like that?
>
> I have this type of antenna.
>
> http://www.aircraftspruce.com/catalog/avpages/antennasystems.php
>
> It does not have a ground plane as it is a half wave antenna. The one I
> have it the 5T which allows the coax to come out and be supported on the
> side of the fuselage with mounting brackets. The antenna is inside the
> fuselage just behind the rear bulkhead on the Lancair Legacy. It is mostly
> vertical, but the ends (top and bottom) curve following the shape of the
> fuselage and become horizontal for the last 4-5 inches. I think the antenna
> is something like 41-42 inches long. My plane is all fiberglass. The only
> carbon fiber is in the horizontal stabilizer, leg fairings, and the wheel
> pants. None of this carbon is closer than three feet or so to the antenna.
>
> But what ever this is, it is intermittent. The receive and transmit seem to
> work fine until they don't work at all. I have heard others tell me that my
> transmissions were staticy from time to time, which is why I have been
> trying to hear myself by listening to the recordings from ATC. If I had not
> done that I would not even have known that I missed 3 radio calls from ATC.
> I was probably close to 5-6 miles out and heading directly toward the
> airport when I was missing the calls.
>
> Also, unrelated, I noticed that if I am on autopilot, (TruTrak Digiflight II
> GPSVG) that the autopilot goes haywire when the radio transmits. I have
> heard of this problem on the internet but have not looked up what may be
> causing it. Maybe you know off the top of your head??
>
> Thanks for all you guys help!
>
> Bill B
>
>
>
>
>
>
>
> * *
> * *
> **
> **
> **
> **
> **
> **
> **
> *http://www.matronics.com/contribution*
> * *
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Message 2
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| Subject: | Source for new Aerostart connectors? |
Beech and no doubt some others used a more
'aviation' vetted connector for ground power
called the "Aerostart" . . .
http://tinyurl.com/6nbpw7e
is anyone on the List aware of a source for
replacement connectors?
Bob . . .
Message 3
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| Subject: | Re: Source for new Aerostart connectors? |
Bob,
Are these connectors close to or what you can use....
http://www.aircraftspruce.com/catalog/elpages/jumpercables.php
http://www.chiefaircraft.com/aircraft/tools/battery-tools.html
They seemed to be called "Piper" type.....
D
_________________________________________________________
----- Original Message -----
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Sent: Tuesday, May 15, 2012 9:39 AM
Subject: AeroElectric-List: Source for new Aerostart connectors?
> <nuckolls.bob@aeroelectric.com>
>
> Beech and no doubt some others used a more
> 'aviation' vetted connector for ground power
> called the "Aerostart" . . .
>
> http://tinyurl.com/6nbpw7e
>
> is anyone on the List aware of a source for
> replacement connectors?
>
>
> Bob . . .
>
>
>
Message 4
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| Subject: | Re: Ignition Interference |
I'm having a major problem with RFI in my Jabiru 3300 Sonex. Radio is MGL V6, just
out a few months ago. Antenna is a belly mounted homemade one made from a
CB antenna. It's 22" long with a single bend, mounted ~2' behind the firewall,
~2' below the com radio. Bob made the cable, RGxxx, double shielded. I get ignition
noise, left mag much worse than the right.
What I've done
Replaced spark plugs with resistive type. No difference.
Disconnected the shielded P leads. No difference.
Disconnected antenna, which cutout all noise. So I figure the noise is radiated,
not conducted. I think I had the squelch all the way down, but it's possible
it was turned up a little.
Connected a separate battery. No difference.
Put beads on coil to distributor leads, antenna, power and ground leads. No difference.
Left mag makes 90% of the noise. Turned off left mag and pulled right plug wires
sequentially. The right mag has always made a much slower 'tick' than the left,
but still couldn't isolate it this way.
Removed jacks and a switch that could have caused ground loops on the panel. No
difference.
Disconnected comm antenna (on belly, 2' aft of firewall) and connected radio to
ELT antenna on top tailcone ~8-10' further back. Cut down noise, but still noticeable.
Replaced left mag spark plug wires with Accel 300+ ferro spiral plug wires. No
difference
Swapped distributor caps. I was in a hurry to get my pilot up in the air, so didn't
listen. He said there was no difference in flight. His transmissions were
very poor. The only time he was easily understood was when he throttled back
on final. He later told me the left and right were both noisy. Changing the distributor
caps didn't seem to do anything. They also looked fine on the inside.
Things I may try
With the new plug wires in, connect the radio to the ELT antenna 8' further back
on the tailcone. Comm antenna is belly mounted, 2' back of the firewall. I'd
done this before the plug wire upgrade and it made a significant improvement,
but the noise was still very noticeable.
Connect a handheld to the comm antenna. If the noise goes away, it's gotta be the
radio, since we've already ruled out noise via system conduction.
Check the SWR. If this is reasonable to do, I'd prolly buy a meter for $50. My
comm antenna is 22" long that I made from a cut down CB antenna. If it shows >3,
I'd fix it or buy a real one.
I'll make sure athe alternator leads going to the voltage regulator are twisted.
Replace the coil to distributor lead with noiseless wire. Some have had success
with this, but most have tamed the noise with beads after using noiseless plug
wires. I don't want to replace this stock coil lead, since I'm not sure I could
make a secure connection and I'm doubtful it would do any good.
Any sugestions?
--------
Dan
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http://forums.matronics.com/viewtopic.php?p=373137#373137
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