Radio Noise

[Bob]

Com Icom A-6 handheld connected only to headset, NO CONNECTION TO A/C
ELECTRICAL. Static noise and flickering RX symbol on handheld (no
voice being received)so distractiing its makes use unbearable. No
static during actual voice reception-tower reports clear,good, no
noise voice. Outside of a/c facing prop or tail (no noise)-move in
circle about a/c noise develops. Inside a/c noise at all times except
during actual voice reception. The following have NO affect: tried
different radio,headset, partchcords-disconnected alternator
belt,field lead-put condensor for noise trap on regulator,coil,
distributor-on/off of elec T/B(has in-line filter),trim
tab,intercom,strobe,elec tach to - coil post,all electrical
connections,wires,terminal strips verified good-only other electrical
are the amp/vot meter connections. Noise does not occur when radio/
headset combo used in other a/c. Noise cancelled out at squelch level
20 and high volume. 12 years building, FAA certified, l year so far
chasing "BUGS" and hopefully last item to correct so I CAN FLY!
P LEASE HELP IF YOU WOULD
Thank You,

[RST Engineering]

Sounds suspiciously like ignition noise to me. You might want to tell us
what kind of aerocraft this is.

Jim

--
"It is the mark of an educated mind to be able to entertain a thought
without accepting it."
--Aristotle


"Bob" > wrote in message
...
> Com Icom A-6 handheld connected only to headset, NO CONNECTION TO A/C
> ELECTRICAL. Static noise and flickering RX symbol on handheld (no
> voice being received)so distractiing its makes use unbearable. No
> static during actual voice reception-tower reports clear,good, no
> noise voice. Outside of a/c facing prop or tail (no noise)-move in
> circle about a/c noise develops. Inside a/c noise at all times except
> during actual voice reception. The following have NO affect: tried
> different radio,headset, partchcords-disconnected alternator
> belt,field lead-put condensor for noise trap on regulator,coil,
> distributor-on/off of elec T/B(has in-line filter),trim
> tab,intercom,strobe,elec tach to - coil post,all electrical
> connections,wires,terminal strips verified good-only other electrical
> are the amp/vot meter connections. Noise does not occur when radio/
> headset combo used in other a/c. Noise cancelled out at squelch level
> 20 and high volume. 12 years building, FAA certified, l year so far
> chasing "BUGS" and hopefully last item to correct so I CAN FLY!
> P LEASE HELP IF YOU WOULD
> Thank You,

[Bob]

On Jan 8, 12:44*pm, Bob > wrote:
> Com Icom A-6 handheld connected only to headset, NO CONNECTION TO A/C
> ELECTRICAL. Static noise and flickering RX symbol on handheld (no
> voice being received)so distractiing its makes use unbearable. *No
> static during actual voice reception-tower reports clear,good, no
> noise voice. Outside of a/c facing prop or tail (no noise)-move in
> circle about a/c noise develops. Inside a/c noise at all times except
> during actual voice reception. The following have NO affect: tried
> different radio,headset, partchcords-disconnected alternator
> belt,field lead-put condensor for noise trap on regulator,coil,
> distributor-on/off of elec T/B(has in-line filter),trim
> tab,intercom,strobe,elec tach to - coil post,all electrical
> connections,wires,terminal strips verified good-only other electrical
> are the amp/vot meter connections. Noise does not occur when radio/
> headset combo used in other a/c. Noise cancelled out at squelch level
> 20 and high volume. 12 years building, FAA certified, l year so far
> chasing "BUGS" and hopefully last item to correct so I CAN FLY!
> P LEASE HELP IF YOU WOULD
> Thank You,

This is a KR2S with a Corvair 2700cc/164cid engine converted per
William Wynne Manual and uses a distributor/coil and a JD Dynamo w/
regulator.

[Bob]

On Jan 8, 5:22*pm, Bob > wrote:
> On Jan 8, 12:44*pm, Bob > wrote:
>
>
>
>
>
> > Com Icom A-6 handheld connected only to headset, NO CONNECTION TO A/C
> > ELECTRICAL. Static noise and flickering RX symbol on handheld (no
> > voice being received)so distractiing its makes use unbearable. *No
> > static during actual voice reception-tower reports clear,good, no
> > noise voice. Outside of a/c facing prop or tail (no noise)-move in
> > circle about a/c noise develops. Inside a/c noise at all times except
> > during actual voice reception. The following have NO affect: tried
> > different radio,headset, partchcords-disconnected alternator
> > belt,field lead-put condensor for noise trap on regulator,coil,
> > distributor-on/off of elec T/B(has in-line filter),trim
> > tab,intercom,strobe,elec tach to - coil post,all electrical
> > connections,wires,terminal strips verified good-only other electrical
> > are the amp/vot meter connections. Noise does not occur when radio/
> > headset combo used in other a/c. Noise cancelled out at squelch level
> > 20 and high volume. 12 years building, FAA certified, l year so far
> > chasing "BUGS" and hopefully last item to correct so I CAN FLY!
> > P LEASE HELP IF YOU WOULD
> > Thank You,
>
> This is a KR2S with a Corvair 2700cc/164cid engine converted per
> William Wynne Manual and uses a distributor/coil and a JD Dynamo w/
> regulator.- Hide quoted text -
>
> - Show quoted text -

Using Moroso Blue Max plug wires.

[[email protected]]

On Jan 8, 5:26*pm, Bob > wrote:
> On Jan 8, 5:22*pm, Bob > wrote:
>
>
>
> > On Jan 8, 12:44*pm, Bob > wrote:
>
> > > Com Icom A-6 handheld connected only to headset, NO CONNECTION TO A/C
> > > ELECTRICAL. Static noise and flickering RX symbol on handheld (no
> > > voice being received)so distractiing its makes use unbearable. *No
> > > static during actual voice reception-tower reports clear,good, no
> > > noise voice. Outside of a/c facing prop or tail (no noise)-move in
> > > circle about a/c noise develops. Inside a/c noise at all times except
> > > during actual voice reception. The following have NO affect: tried
> > > different radio,headset, partchcords-disconnected alternator
> > > belt,field lead-put condensor for noise trap on regulator,coil,
> > > distributor-on/off of elec T/B(has in-line filter),trim
> > > tab,intercom,strobe,elec tach to - coil post,all electrical
> > > connections,wires,terminal strips verified good-only other electrical
> > > are the amp/vot meter connections. Noise does not occur when radio/
> > > headset combo used in other a/c. Noise cancelled out at squelch level
> > > 20 and high volume. 12 years building, FAA certified, l year so far
> > > chasing "BUGS" and hopefully last item to correct so I CAN FLY!
> > > P LEASE HELP IF YOU WOULD
> > > Thank You,
>
> > This is a KR2S with a Corvair 2700cc/164cid engine converted per
> > William Wynne Manual and uses a distributor/coil and a JD Dynamo w/
> > regulator.- Hide quoted text -
>
> > - Show quoted text -
>
> Using Moroso Blue Max plug wires.

Unshielded ignition leads. Unshielded tach lead, unshielded
distributor wiring to the switch. No wonder there's lots of noise.
Every spark impulse produces a broadband radio signal.

Dan

[Dana M. Hague[_2_]]

On Thu, 8 Jan 2009 11:44:35 -0800 (PST), Bob > wrote:

>Com Icom A-6 handheld connected only to headset, NO CONNECTION TO A/C
>ELECTRICAL. Static noise and flickering RX symbol on handheld (no
>voice being received)so distractiing its makes use unbearable...

I have the A24 (same radio as yours except with VOR added). I
eliminated the noise by turning on the radios "ANL" (Automatic Noise
Limiter) function, and switching to resistor spark plugs.

-Dana
--
I don't suffer from insanity. I enjoy every minute of it.

[RST Engineering]

My diagosis from afar is ignition noise. No two ways about it. You MIGHT
be able to get away with resistor wire or resistor plugs, but talk to your
local EAA tech counselor about shielded ignition, shielded this, shielded
that.

An automotive engine is one of the best broadband noise sources known to
man.

Jim




This is a KR2S with a Corvair 2700cc/164cid engine converted per
William Wynne Manual and uses a distributor/coil and a JD Dynamo w/
regulator.