Today's Message Index:
----------------------
1. 07:31 AM - Re: Frequency problem update (Robert L. Nuckolls, III)
2. 10:29 AM - Re: Frequency problem update (danielj.billingsley@yahoo.com)
3. 03:15 PM - Re: Frequency problem update (Robert L. Nuckolls, III)
4. 03:50 PM - Re: Frequency problem update (Bill Maxwell)
5. 10:59 PM - Garmin 430 Intercom Connections (Justin Jones)
Message 1
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| Subject: | Re: Frequency problem update |
On 2/9/2015 6:25 PM, danielj.billingsley@yahoo.com wrote:
A little over a week ago I mentioned I recently purchased a Bose
headset that would not allow me to make a call to tower. I could talk
to ground, yet , when I switched over to tower I got nothing but a
loud high-pitched squeal. I wanted to give an up-date as I have the
problem resolved. All it took was going to Radio Shack and purchased
a couple ferrite beads. I snapped one on the coax behind my radio,
started my engine and hit the PTT. It was almost gone but still a
chirp here and there. I shut down and snapped the second one on the
coax just in front of the antenna. Works perfect now. Hope this can
help others with similar problems.
Dan B
--------------------------
At 20:39 2015-02-09, Kelly wrote:
Sounds like your antenna coax has compromised shielding, that allows
RF leakage. Most likely the ferrite beads mask the problem. A new
coax would likely give same result.
=====================
I agree. The OUTSIDE of a properly installed coax is radio frequency
neutral . . . i.e. nothing of what exists inside the coax will
exist outside the coax. The fact that adding anything outside
has an influence on observed behaviors suggests that your coax
is behaving more like a piece of wire than a properly functioning
transmission line.
Metal or composite airplane? If composite, what kind of
ground plane under your antenna? Where is antenna located
on airplane? Check your coax connectors at both ends . . .
Bob . . .
Message 2
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| Subject: | Re: Frequency problem update |
Bob, This is a tube and fabric plane (Kitfox). My connection to the radio w
as straight forward, however, the antenna (which is in the vertical stab.)
is a simple SS pole with just a thread and nut end. I crimped a washer like
connector on the primary wire and tightened it with a nut. The outside str
and was twisted and crimped on the same type of connector and I bolted that
to the frame. I always felt as if this were Disneyland-type engineering. A
re there any other options or ideas?Thanks,Dan B
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
To: aeroelectric-list@matronics.com
Sent: Wednesday, February 11, 2015 8:29 AM
Subject: Re: AeroElectric-List: Frequency problem update
s.bob@aeroelectric.com>
On 2/9/2015 6:25 PM, danielj.billingsley@yahoo.com wrote:
A little over a week ago I mentioned I recently purchased a Bose
headset that would not allow me to make a call to tower. I could talk
to ground, yet , when I switched over to tower I got nothing but a
loud high-pitched squeal. I wanted to give an up-date as I have the
problem resolved. All it took was going to Radio Shack and purchased
a couple ferrite beads. I snapped one on the coax behind my radio,
started my engine and hit the PTT. It was almost gone but still a
chirp here and there. I shut down and snapped the second one on the
coax just in front of the antenna. Works perfect now. Hope this can
help others with similar problems.
Dan B
--------------------------
At 20:39 2015-02-09, Kelly wrote:
Sounds like your antenna coax has compromised shielding, that allows
RF leakage. Most likely the ferrite beads mask the problem. A new
coax would likely give same result.
=====================
I agree. The OUTSIDE of a properly installed coax is radio frequency
neutral . . . i.e. nothing of what exists inside the coax will
exist outside the coax.=C2- The fact that adding anything outside
has an influence on observed behaviors suggests that your coax
is behaving more like a piece of wire than a properly functioning
transmission line.
Metal or composite airplane? If composite, what kind of
ground plane under your antenna?=C2- Where is antenna located
on airplane? Check your coax connectors at both ends . . .
=C2- Bob . . .
-
S -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 3
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| Subject: | Re: Frequency problem update |
At 12:27 2015-02-11, you wrote:
>Bob, This is a tube and fabric plane (Kitfox). My connection to the
>radio was straight forward, however, the antenna (which is in the
>vertical stab.) is a simple SS pole with just a thread and nut end.
>I crimped a washer like connector on the primary wire and tightened
>it with a nut. The outside strand was twisted and crimped on the
>same type of connector and I bolted that to the frame. I always felt
>as if this were Disneyland-type engineering. Are there any other
>options or ideas?
>Thanks,
>Dan B
Does this installation have a service history? Are there
exemplar installations flying? The first Kitfox structure
image that popped up in a search looks like this . . .
Emacs!
If this is applicable to your airplane, where is the antenna located
with respect to the metallic structure of the vertical fin? I'm
puzzled as to how an antenna 'buried' under the fabric can
enjoy the necessity for a relatively 'free' view of the
universe in all directions around the antenna. An antenna
mounted in close proximity to the metallic structure of this
fuselage would be first seriously detuned from it's design
frequency and second, suffer severe distortion of radiation
patterns. It would be interesting to see what kind of SWR
measurements you get from such an installation.
The drawing above calls out an antenna mounting feature
that would offer a best-compromise location for your Comm
antenna.
Bob . . .
Message 4
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| Subject: | Re: Frequency problem update |
Message 5
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| Subject: | Garmin 430 Intercom Connections |
I am digging through manuals trying to understand how to hook up my simple setup.
I have a Garmin 430W (with nav and com) and a PS Engineering PM1000 II 4 place
intercom. My goal is to be able to transmit and receive VHF communications,
listen to the Ident of the Navaids when tuned, and have it connected to the
4 place intercom.
The Garmin Manual shows
Com Mic Key
Intercom Mic Hi
Com Mic Audio Hi
500 Com Audio Hi
Com Mic Audio Lo
500 Com Mic Audio Lo
The PS Engineering Audio Panel has the following connections for the Aircraft Radio
A/C Radio phone Audio hi
A/C Radio phone Audio Lo
A/C Radio PTT
A/C Mic Audio Lo
A/C Mic Audio Hi
Why does Garmin list an Intercom Mic Hi pin? I assume this doesnt get connected
if an external intercom is used.
Does the "A/C Radio PTT get connected to the Com Mic Key or to the ?
The manual says 500 COM AUDIO is the summation of the COM receiver audio, COM sidetone
audio, and Intercom MIC audio. Why have the com Com Mic Audio connections
if the 500 Com Mic audio includes all the listed inputs?
Thoughts?
I am going crosseyed trying to figure all this out.
Thanks
Justin
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