Today's Message Index:
----------------------
1. 10:07 AM - Re: Re: Weak and Static on Transmission (Noel Loveys)
2. 11:24 AM - Re: Z-12, Z-13/8 or a bit of both! (MikeDunlop)
3. 04:01 PM - Two Speed Controller and Relay Deck for Ray-Allen actuators (Robert L. Nuckolls, III)
4. 04:02 PM - Re: 28 to 12v down-converter (Robert L. Nuckolls, III)
5. 04:07 PM - Re: Re: Z-12, Z-13/8 or a bit of both! (Robert L. Nuckolls, III)
6. 08:22 PM - Grounding - 28 to 12v down-converter (Paul Millner)
Message 1
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| Subject: | Re: Weak and Static on Transmission |
The momentary switch is actually a remote PTT for the headset and doesn't
activate the built in mic.
What I was thinking is that you may have being having a problem with heat on
the spark plugs, voltage reg or rectifier. I had it happen once with a
R-582 when the seal for the water jacked perforated and allowed the plugs to
foul at anything less than WOT. What was happening was water from the
cooling system was getting into the cylinders and fouling the resistor
plugs. At one point I was flying literally feet from the tower's antenna and
still had major TX/RX problems.
Now assuming that your problem is not heat originated what I would try is
unloading your buss in flight to see if any particular circuit could be
interfering with your radio. The last test I would try is to use the
portable radio and shut down the master switch and the gen switch.
Noel
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bill
Bradburry
Sent: January 22, 2012 8:04 PM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
<bbradburry@bellsouth.net>
I wonder why the handheld mike is not turned off when the headset adapter is
plugged in? That would solve the problem and you wouldn't need to buy an
"optional" part so that it will work.
I haven't noticed much of a problem with receiving when I am on the ground.
It also seems better when I get close to the airport and contact the tower.
At first, I thought the problem was with approach/departure freq because
that was where I had the most trouble.
Bill B
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Noel
Loveys
Sent: Sunday, January 22, 2012 5:12 PM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
The adapter you describe is simply a NO (normally open) momentary switch
connected to a 1/8 in mono jack. Both mikes only open if you push the PTT
switch on the radio.
Noel
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bill
Bradburry
Sent: January 22, 2012 4:26 PM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
<bbradburry@bellsouth.net>
Bob,
I have borrowed an ICOM A6 handheld that I could use to do the sniffing you
are describing, but I cant use it to transmit in the plane. It seems that
the A6 comes with a headset adapter, but if you don't also buy the optional
PTT adapter as well, both mics will be open at the same time.
Do you suggest a good value handheld radio? I need to buy one, but I am
concerned with the type of "gotchas" that ICOM seems to have. It also will
not transmit they tell me if the external power is plugged in.
During this probing you describe, I should have everything in the panel
turned on for the first pass, then if I get a response, start turning
everything off one at a time till I find what causes the response??
This includes the radio??
Bill B
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Sunday, January 22, 2012 10:52 AM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
<nuckolls.bob@aeroelectric.com>
At 07:38 AM 1/20/2012, you wrote:
><bbradburry@bellsouth.net>
>
>Well, to further clarify this problem. I seem to be able to hear ok on the
>ground while taxiing around the airport, but after I leave the airport the
>reception gets really bad. At first I thought it was a problem with the
>approach frequency because that is where it would first start up. It was a
>loud hiss in the headphones so loud that I could not hear ATC. In fact, I
>have made two NORDO landings as a result on this loud hiss. I sent my
radio
>back to have it checked out and nothing was found. All this trouble is at
>below 5000 ft and fine weather. I am flying off my 40 hours (22 so far)
and
>am only flying in good weather. These radio problems at a Class C airport
>have made me afraid to fly. ATC could take some action against me if it
>continues.
This is the first time I've been aware that you were having
problems both with hearing and talking. While the ground
listeners complain of "static" you have described the extraneous
audio as a "hiss". We may be talking of two different problems.
I'm having trouble resolving a single noise source that would
manifest in both what you hear and what is transmitted to the
ground.
Get a hand-held transceiver and use it to 'probe' around
the airplane. Use tune the hand-held to an unused frequency,
open the squelch and open the volume to get a low level of
no-signal hiss common to all receivers. Then probe around
the panel mounted goodies and wire harnesses with the
hand-held's antenna. See if the no-signal hiss changes
in level with the master switch on versus off. If it does
change, turn off accessories and/or pull breakers/fuses to
see if any one accessory produces a noticeable change
in noise from the hand-held.
You can use the hand-held as an airborne signal quality
sniffer too. Use a headset with the hand held to listen
to your own transmitted signals. You may have to take the
antenna off the hand-held to avoid overloading the hand-held
receiver. You don't need to talk on the ship's radio, just
listen to your transmitted signal to characterize the noise.
Is it the same "hiss" you hear in your received signals?
In any case, carry the hand held to avoid the no-radio
return to the airport. In fact, having the 'three musketeers
of dark-panel ops' in your flight bag is good insurance
for any flights:
www.aeroelectric.com/Pictures/Misc/Failure_Tolerance.pdf
It was also suggested that you try a substitute antenna.
I've fabricated test antennas that could be taped to the
top or bottom surface of a wing and coax brought into
the cockpit through the door gasket or some other pathway.
But using the hand-held to characterize your transmitted
and received signals personally takes ATC and others
out of the loop. This is an especially good thing when
they're unable/unwilling to join the discussion and
offer their own observations/insights.
Bob . . .
Message 2
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| Subject: | Re: Z-12, Z-13/8 or a bit of both! |
The basics are as follows:
I need to use the section of Z-12 that encompasses the Primary alternator section
(Alternator and the B&C LR-3 controller), then use the section for Z-13/8 that
encompasses the secondary alternator (B&C SD-8).
I have a single copper tube being used as an earth conduit, this tube has copper
tabs wrapped around, clamped and soldered at each end ready for appropriate
earth cabling. Inside the copper tube I have a high quality welding cable (equivalent
to AWN #2).
Further questions:
Can anyone see a downside of mixing the Z-12 and Z-13/8 like above.
What is the minimum size cable can I use from the front earth rail tab to the instrument
earth bus (approx 18-20 inches in length)
MikeD (U.K.)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=364587#364587
Message 3
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| Subject: | Two Speed Controller and Relay Deck for Ray-Allen actuators |
At 01:08 PM 1/22/2012, you wrote:
>The same ebay company had this:
><http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250975404341#ht_4310wt_1398>http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250975404341#ht_4310wt_1398
>
>Looks like it would be an economical alternative to the high dollar
>relay decks used with stick grip switches, etc. The relay coils are
>5V, but a handful of dropping resistors or a 5V supply feeding the
>control switches would solve that.
If your talking about Ray-Allen actuators, this would be
horrible overkill. These actuators need about 100 mA for
operation. The relays needed are simple one-pole, double-
throw devices available in 12 or 24 volts for under $4.
The bill of materials to build an adjustable, two-speed
controller is under $10. See:
http://www.aeroelectric.com/PPS/Flight/Trim/Two_Speed_Trim_2.pdf
Except for the selection of relay (12/24) the bill of
materials is the same for installing a 2-speed Ray-Allen
trim actuator in either a 14 or 28v airplane.
With a tad more head scratching, the relays can be replaced
with transistors and a circuit could be evolved that would
work in either 14/28 volt airplanes.
One COULD use a big honk'n down converter and use it to
run all trim systems and power cockpit accessories.
Bob . . .
Message 4
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| Subject: | Re: 28 to 12v down-converter |
At 02:19 PM 1/22/2012, you wrote:
>Seems like isolating the input ground and output ground could be
>difficult in some situations... manageable to isolate the lighter
>socket, but if, for instance, you're running an audio device that
>you want to connect to music-in on the intercom, oh oh!
>
>Paul
Not sure of the issue. The input and output for this
device share common ground . . . which in this case
would be the instrument panel avionics ground. Not sure
why one would find it necessary to 'isolate' the lighter
socket.
Bob . . .
Message 5
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| Subject: | Re: Z-12, Z-13/8 or a bit of both! |
At 01:20 PM 1/23/2012, you wrote:
>
>The basics are as follows:
>I need to use the section of Z-12 that encompasses the Primary
>alternator section (Alternator and the B&C LR-3 controller), then
>use the section for Z-13/8 that encompasses the secondary alternator
>(B&C SD-8).
These are ARCHITECTURE DRAWINGS not wiring diagrams for
any particular airplane. You seem to want the features of
Z-13/8 which can accept ANY main alternator/regulator combination
of ANY pedigree.
>
>I have a single copper tube being used as an earth conduit, this
>tube has copper tabs wrapped around, clamped and soldered at each
>end ready for appropriate earth cabling. Inside the copper tube I
>have a high quality welding cable (equivalent to AWN #2).
Do I presume that you're building a canard pusher?
>Can anyone see a downside of mixing the Z-12 and Z-13/8 like above.
No 'mixing' required. Your suite of preferred hardware is
easily integrated into a Z-13/8 architecture.
>What is the minimum size cable can I use from the front earth rail
>tab to the instrument earth bus (approx 18-20 inches in length)
Where is the battery? Do cranking currents flow in the
copper tube?
Bob . . .
Message 6
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| Subject: | Grounding - 28 to 12v down-converter |
>> Not sure of the issue. The input and output for this device share
common ground .
Oh? Where is that specified? I was going by this note in the spec:
*Note:*
-Input/output negative cannot be mixed with or together
Maybe my "Chinglish" is not up to the task of translating that?
Paul
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