Today's Message Index:
----------------------
1. 06:26 AM - Re: Ground connection (racerjerry)
2. 07:04 AM - Re: Re: Ground connection (Raymond Lambert)
3. 09:03 AM - Constant RX on a particular frequency (Bill Bradburry)
4. 09:31 AM - Re: Digital Industrial Scales Outlets (Eric M. Jones)
5. 09:41 AM - Re: Constant RX on a particular frequency ()
6. 09:59 AM - Re: Constant RX on a particular frequency (Bill Putney)
7. 10:09 AM - Re: Constant RX on a particular frequency (Robert L. Nuckolls, III)
8. 11:15 AM - Re: Constant RX on a particular frequency (Bill Hibbing)
9. 11:24 AM - radio noise (Gordon or Marge)
10. 12:33 PM - radio noise (Gordon or Marge)
11. 12:51 PM - Re: Re: Digital Industrial Scales Outlets (Henador Titzoff)
12. 01:32 PM - Re: Re: Ground connection (Robert L. Nuckolls, III)
13. 01:39 PM - Re: Constant RX on a particular frequency (Robert L. Nuckolls, III)
14. 01:57 PM - Re: radio noise (Robert L. Nuckolls, III)
15. 04:40 PM - Re: radio noise (Gordon or Marge)
Message 1
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Subject: | Re: Ground connection |
If you are gonna splice and solder, you MUST have a good mechanical connection;
otherwise vibration can easily cause separation. A solid mechanical connection
is usually achieved by wrapping a couple of turns of the branch wire around
the main cable. The only problem with this method is that, especially for heavy
cables, you now have a branch wire that wants to exit at 90 degrees. If
you need the cables parallel, which is usually the case, I have had success achieving
a good mechanical connection by using copper strands stripped from flexible
building wire to wrap and tie several turns around both cables after very
lightly tinning both cables before the final soldering.
BTW, split bolts work great to give a bulletproof mechanical connection; although
as Bob says, somewhat bulky. One thing I would caution about split bolts
If you EVER need to splice in aluminum wire; and especially when splicing aluminum
to copper, make sure that you use the plated variety (not bare copper) of
split bolt, along with some anti-oxidant compound. Please dont ask me how I
know.
--------
Jerry King
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=396405#396405
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Subject: | Re: Ground connection |
On 3/17/2013 9:24 AM, racerjerry wrote:
>
> If you are gonna splice and solder, you MUST have a good mechanical connection;
otherwise vibration can easily cause separation. A solid mechanical connection
is usually achieved by wrapping a couple of turns of the branch wire around
the main cable. The only problem with this method is that, especially for
heavy cables, you now have a branch wire that wants to exit at 90 degrees. If
you need the cables parallel, which is usually the case, I have had success
achieving a good mechanical connection by using copper strands stripped from flexible
building wire to wrap and tie several turns around both cables after very
lightly tinning both cables before the final soldering.
>
> BTW, split bolts work great to give a bulletproof mechanical connection; although
as Bob says, somewhat bulky. One thing I would caution about split bolts
If you EVER need to splice in aluminum wire; and especially when splicing aluminum
to copper, make sure that you use the plated variety (not bare copper)
of split bolt, along with some anti-oxidant compound. Please dont ask me how
I know.
>
> --------
> Jerry King
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=396405#396405
>
> Thank you guys,
I will try something that I found in AeroElectric_Connection_E-Book chapter 09,
page 9-7, figure 9-5.
Thanks again
Ray
>
>
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Subject: | Constant RX on a particular frequency |
What are the probable causes if you are getting a constant loud SHHHHHHHHHH
on a particular frequency and the radio is showing an RX? I can faintly
make out a voice over the hiss from time to time, but I can not make out
what is being said. Is this a stuck mike? Would breaking squelch cause
this? I am trying to determine if this is caused by my radio or the
transmitting radio. Also during this time, one other aircraft made a
broadcast and it came in loud and clear and stopped the hiss while he was
transmitting.
This is happening with the approach freq at my home airport. This has been
going on for some time now. If I switch to the tower freq the problem
resolves. The approach transmitter might be 15-20 miles further out.
Yesterday, I mentioned the hiss to approach and she did something that made
it better, then asked me if it helped.
Does anybody know what might be going on here?
Bill
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Subject: | Re: Digital Industrial Scales Outlets |
Try these guys:
http://lmgtfy.com/?q=digital+industrial+weighing+scales
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=396412#396412
Message 5
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Subject: | Re: Constant RX on a particular frequency |
Radio, antenna specs? Is this something new, or has it always done
that? Have you changed the squelch settings?
From: Bill Bradburry
Sent: Sunday, March 17, 2013 11:01 AM
Subject: AeroElectric-List: Constant RX on a particular frequency
What are the probable causes if you are getting a constant loud
SHHHHHHHHHH on a particular frequency and the radio is showing an RX? I
can faintly make out a voice over the hiss from time to time, but I can
not make out what is being said. Is this a stuck mike? Would breaking
squelch cause this? I am trying to determine if this is caused by my
radio or the transmitting radio. Also during this time, one other
aircraft made a broadcast and it came in loud and clear and stopped the
hiss while he was transmitting.
This is happening with the approach freq at my home airport. This has
been going on for some time now. If I switch to the tower freq the
problem resolves. The approach transmitter might be 15-20 miles further
out. Yesterday, I mentioned the hiss to approach and she did something
that made it better, then asked me if it helped.
Does anybody know what might be going on here?
Bill
Message 6
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Subject: | Re: Constant RX on a particular frequency |
No hints for us? Did she say what she did?
The constant SHHHHHH is the squelch set too loose or a very weak signal
on that channel. This could be local noise (computer, laptop, PDA,
electronic instruments all make a little RF noise) in your airplane of a
mix of frequencies that makes a weak signal on that channel.
Adjusting the squelch setting higher will fix the problem. If it's a not
so weak signal, adjusting the squelch to get rid of annoying signal may
mean that you may not hear a call from a controller when you're right at
the outer edge of coverage. It's a balance.
The squelch should be adjusted so that signals that are useable (ones
you could make out what is being said) are let through and noise and
signals that are distant or weak and just a distraction (i.e. others
using the CTAF channel your local airport at another airport) are
suppressed.
Bill
On 3/17/13 9:01 AM, Bill Bradburry wrote:
>
> What are the probable causes if you are getting a constant loud
> SHHHHHHHHHH on a particular frequency and the radio is showing an RX?
> I can faintly make out a voice over the hiss from time to time, but I
> can not make out what is being said. Is this a stuck mike? Would
> breaking squelch cause this? I am trying to determine if this is
> caused by my radio or the transmitting radio. Also during this time,
> one other aircraft made a broadcast and it came in loud and clear and
> stopped the hiss while he was transmitting.
>
> This is happening with the approach freq at my home airport. This has
> been going on for some time now. If I switch to the tower freq the
> problem resolves. The approach transmitter might be 15-20 miles
> further out. Yesterday, I mentioned the hiss to approach and she did
> something that made it better, then asked me if it helped.
>
> Does anybody know what might be going on here?
>
> Bill
>
> *
>
>
> *
Message 7
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Subject: | Re: Constant RX on a particular frequency |
At 11:01 AM 3/17/2013, you wrote:
>What are the probable causes if you are getting a constant loud
>SHHHHHHHHHH on a particular frequency and the radio is showing an
>RX? I can faintly make out a voice over the hiss from time to time,
>but I can not make out what is being said. Is this a stuck
>mike? Would breaking squelch cause this? I am trying to determine
>if this is caused by my radio or the transmitting radio. Also
>during this time, one other aircraft made a broadcast and it came in
>loud and clear and stopped the hiss while he was transmitting.
>
>This is happening with the approach freq at my home airport. This
>has been going on for some time now. If I switch to the tower freq
>the problem resolves. The approach transmitter might be 15-20 miles
>further out. Yesterday, I mentioned the hiss to approach and she
>did something that made it better, then asked me if it helped.
>
>Does anybody know what might be going on here?
The potential sources for this phenomenon are
endless . . . but if folks on the ground can
do something that has an effect, then it sounds
like (1) they have some notion as to what is
happening even (2) if they don't know why it happens.
If the mystery signal is easily overpowered by
a transmission from an source with no mystery
attached suggests that it's not something that
is happening by design. A weak-signal anomaly.
ATC facilities tend to co-locate their assets.
There's a couple of sites west and SW of the
ICT that feature an equipment building surrounded
by a quad of towers.
Emacs!
Each tower mounts LOTS of antennas with each antenna
intended to service one radio in a shared RF environement
with lots of other radios. Unfortunately, this environment
is akin to an orchestra of a few dozen instruments on which
each user is playing their own tune.
Emacs!
Back in my two-way radio days we used to call sites like this
"intermod city" referring to the difficulties of co-locating
many radios. The signals from two talking radios could 'mix'
in adjacent, overloaded receiver circuits to product poor behavior in the
offended radio and in rare cases, RERADIATE products of that
attack with sufficient strength to be heard by a sensitive receiver
some distance away.
When your observations mentioned involvement of ATC facilities
the first image that popped to mind was an un-mitigated intermod
situation on the ground . . . one that the controllers have been
made aware of and are able to react in some manner that makes it
go away even if they cannot fix it. Conversely, it may be a condition
that's on a list of squawks waiting for the techno-wienies to come
out and fix it.
Just a guess . . .
Bob . . .
>
>Bill
>
>
><http://www.matronics.com/Navigator?AeroElectric-List>http://www.matronics.com/Navigator?AeroElectric-List
><http://www.matronics.com/contribution>http://www.matronics.com/contribution
>
>
>No virus found in this message.
>Checked by AVG - <http://www.avg.com>www.avg.com
Bob . . .
Message 8
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Subject: | Re: Constant RX on a particular frequency |
Here's a very remote possibility if the freq you're hearing this on is 134.
825 or higher. That freq is the 5th harmonic of channel 1 on the citizens
band and it would go up for each channel. Once I heard this happen on a ce
nter freq while flying at 35,000 and I forget which CB channel it was but h
e was 5x5. Of course it drove everybody on the freq nuts because we couldn
't talk to the guy but we soon flew out of it. It could be that a CBer has
a radio on with a stuck mike and doesn't know it. If the freq you're hear
ing this on is lower then you can discount this possibility.
Bill
----- Original Message -----
From: Robert L. Nuckolls, III
To: aeroelectric-list@matronics.com
Sent: Sunday, March 17, 2013 12:04 PM
Subject: Re: AeroElectric-List: Constant RX on a particular frequency
At 11:01 AM 3/17/2013, you wrote:
What are the probable causes if you are getting a constant loud SHHHHHH
HHHH on a particular frequency and the radio is showing an RX? I can faint
ly make out a voice over the hiss from time to time, but I can not make out
what is being said. Is this a stuck mike? Would breaking squelch cause t
his? I am trying to determine if this is caused by my radio or the transmi
tting radio. Also during this time, one other aircraft made a broadcast an
d it came in loud and clear and stopped the hiss while he was transmitting.
This is happening with the approach freq at my home airport. This has
been going on for some time now. If I switch to the tower freq the problem
resolves. The approach transmitter might be 15-20 miles further out. Yes
terday, I mentioned the hiss to approach and she did something that made it
better, then asked me if it helped.
Does anybody know what might be going on here?
-----
No virus found in this message.
Checked by AVG - www.avg.com
Message 9
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Bob, et al:
Been a long time since I posted to any list but this time I have a
question.
My RV-4 com radio when neither transmitting nor receiving presents noise
to
the headsets that is unacceptable. An incoming signal of reasonable
strength comes through clearly and the transmit has been ok, but one
pilot
described my signal as weak. The radio is a Walter Dittel FSG71 and has
been checked by Peninsula Avionics and found to be ok, or at least not
found
to be defective. The tech type that worked on it suggested checking the
antenna for good base contact with the metal skin. I removed the antenna
thinking that there might be corrosion (20 years in service) and found
the
faying surfaces to be coated with oil but with bright metal on both
sides.
I have been through all the connections and find no anomalies. Headset
jacks are insulated with clean contacts. The Sigtronics intercom is
wired
through the radio and when the radio is turned off, works fine.
Questions: Would the presense of oil compromise the antenna performance
and
if so, would dielectric grease serve to improve it?
Is there a failure mode for the antenna itself that
could
result in the above symptoms and how could one tell?
Thank you very much.
We should talk some time.
Gordon Comfort
N363GC
Message 10
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Bob, et al:
Been a long time since I posted to any list but this time I have a
question.
My RV-4 com radio when neither transmitting nor receiving presents noise
to
the headsets that is unacceptable. An incoming signal of reasonable
strength comes through clearly and the transmit has been ok, but one
pilot
described my signal as weak. The radio is a Walter Dittel FSG71 and has
been checked by Peninsula Avionics and found to be ok, or at least not
found
to be defective. The tech type that worked on it suggested checking the
antenna for good base contact with the metal skin. I removed the antenna
thinking that there might be corrosion (20 years in service) and found
the
faying surfaces to be coated with oil but with bright metal on both
sides.
I have been through all the connections and find no anomalies. Headset
jacks are insulated with clean contacts. The Sigtronics intercom is
wired
through the radio and when the radio is turned off, works fine.
Questions: Would the presense of oil compromise the antenna performance
and
if so, would dielectric grease serve to improve it?
Is there a failure mode for the antenna itself that
could
result in the above symptoms and how could one tell?
Thank you very much.
We should talk some time.
Gordon Comfort
N363GC
Message 11
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Subject: | Re: Digital Industrial Scales Outlets |
Eric, this is killer!=0A=0A-=0AHenador Titzoff=0A=0A=0A__________________
______________=0A From: Eric M. Jones <emjones@charter.net>=0ATo: aeroelect
ric-list@matronics.com =0ASent: Sunday, March 17, 2013 12:31 PM=0ASubject:
AeroElectric-List: Re: Digital Industrial Scales Outlets=0A =0A--> AeroElec
tric-List message posted by: "Eric M. Jones" <emjones@charter.net>=0A=0ATry
these guys:=0A=0Ahttp://lmgtfy.com/?q=digital+industrial+weighing+scales
=0A=0A--------=0AEric M. Jones=0Awww.PerihelionDesign.com=0A113 Brentwood D
rive=0ASouthbridge, MA 01550=0A(508) 764-2072=0Aemjones(at)charter.net=0A
=0A=0A=0A=0ARead this topic online here:=0A=0Ahttp://forums.matronics.com/v
===========
Message 12
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Subject: | Re: Ground connection |
Thank you guys,
I will try something that I found in AeroElectric_Connection_E-Book
chapter 09, page 9-7, figure 9-5.
Not sure this is applicable to your task. I
think the design goal is to make a reliable
electrical connection to a ground where
you've decided that you don't want to 'break
into' the wire.
You don't have big mechanical issues here. This
isn't a span of wire between poles and exposed to
the weather. I think I would bare a short run of
strands in the main wire, say 1" and lay one or
more strands of your new branch conductors along
side. Then harvest a couple fine strands of wire,
several inches from a piece of scrap. Use these
strands to bind the branch wires to the main wire,
then solder and wrap with silicone rubber tape
(self bonding without adhesive).
This should produce an electrically reliable
connection with more than adequate mechanical
characteristics.
Here's another case where individual strands
from the wire's lay-up are pressed into service
as an aid to fixturing the principal conductors
while the joint is being soldered.
http://tinyurl.com/c5v2xvm
Bob . . .
Message 13
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Subject: | Re: Constant RX on a particular frequency |
At 01:14 PM 3/17/2013, you wrote:
>Here's a very remote possibility if the freq you're hearing this on
>is 134.825 or higher. That freq is the 5th harmonic of channel 1 on
>the citizens band and it would go up for each channel. Once I heard
>this happen on a center freq while flying at 35,000 and I forget
>which CB channel it was but he was 5x5. Of course it drove
>everybody on the freq nuts because we couldn't talk to the guy but
>we soon flew out of it. It could be that a CBer has a radio on with
>a stuck mike and doesn't know it. If the freq you're hearing this
>on is lower then you can discount this possibility.
I wouldn't think that the ATC person would have been
able to 'make it better' but your hypothesis for a
potential interference source is sound.
While living in Wichita, I would occasionally hear
a cb'er yakking it up for just a few seconds as he
drove along a main street about 75 yards south of
my house. His transmitter was getting into the audio
system in my workshop. I think I know who it was at
least by sight of the vehicle. On several occasions
I saw a white van in the local parking lots that
sported a very hefty, center loaded antenna right
in the middle of the roof. The van didn't carry
ham tags and the antenna was not a multi-band HF
device. My assumption is that he had a really big-dog
linear amplifier on his CB transceiver.
Those products are not only STRONG on their fundamental
operating frequency, they can be rich in harmonic
content as well. Since they're illegal devices, the
folks who sell them are not strongly disposed to control
spurious emissions.
Bob . . .
Message 14
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>At 01:24 PM 3/17/2013, you wrote:
>Bob, et al:
>Been a long time since I posted to any list but this time I have a question.
It HAS been a long time my friend. Hope you and Marge are
both well . . .
> My RV-4 com radio when neither transmitting nor receiving
> presents noise to the headsets that is unacceptable. An incoming
> signal of reasonable strength comes through clearly and the
> transmit has been ok, but one pilot described my signal as
> weak. The radio is a Walter Dittel FSG71 and has been checked by
> Peninsula Avionics and found to be ok, or at least not found to be
> defective. The tech type that worked on it suggested checking the
> antenna for good base contact with the metal skin. I removed the
> antenna thinking that there might be corrosion (20 years in
> service) and found the faying surfaces to be coated with oil but
> with bright metal on both sides. I have been through all the
> connections and find no anomalies. Headset jacks are insulated
> with clean contacts. The Sigtronics intercom is wired through the
> radio and when the radio is turned off, works fine.
>
>Questions: Would the presense of oil compromise the antenna
>performance and if so, would dielectric grease serve to improve it?
Probably not if the screws were tight.
>Is there a failure mode for the antenna itself that could result in
>the above symptoms and how could one tell?
Probably not for the antenna but certainly for the coax.
Connectors on both ends are solidly attached? Do you have
access to an SWR meter?
Do I interpret your words to mean that only one pilot
has complained about your signals being 'weak'?
Listener interpretation of signal quality is an iffy
sort of thing. Somebody with a rich history in radio
communications, particularly AM would have an 'ear' for
various quality issues which go to modulation depth,
distortions, and overall signal strength. In other words
have a grey bearded ham listen to your signal on a hand
held from a mile or so away.
Also, take the first opportunity in a unicom environment
to ask several other pilots how your signals sound in
relation to others in the same conversation. The single,
isolated signal report may not be terribly reliable.
>
>Thank you very much.
>We should talk some time.
Let's do that. I think I've still got your mobile number
in my phone from our last meeting at OSH . . . I think that
was 2007. Does your number still end in 6966?
Bob . . .
Message 15
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-----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, March 17, 2013 4:50 PM
Subject: Re: AeroElectric-List: radio noise
--> <nuckolls.bob@aeroelectric.com>
>At 01:24 PM 3/17/2013, you wrote:
>Bob,
>Been a long time since I posted to any list but this time I have a
>question.
It HAS been a long time my friend. Hope you and Marge are
both well . . .
>Questions: Would the presense of oil compromise the antenna
>performance and if so, would dielectric grease serve to improve it?
Probably not if the screws were tight.
>Is there a failure mode for the antenna itself that could result in
>the above symptoms and how could one tell?
Probably not for the antenna but certainly for the coax.
Connectors on both ends are solidly attached? Do you have
access to an SWR meter?
Do I interpret your words to mean that only one pilot
has complained about your signals being 'weak'?
Listener interpretation of signal quality is an iffy
sort of thing. Somebody with a rich history in radio
communications, particularly AM would have an 'ear' for
various quality issues which go to modulation depth,
distortions, and overall signal strength. In other words
have a grey bearded ham listen to your signal on a hand
held from a mile or so away.
Also, take the first opportunity in a unicom environment
to ask several other pilots how your signals sound in
relation to others in the same conversation. The single,
isolated signal report may not be terribly reliable.
>
>Thank you very much.
>We should talk some time.
Let's do that. I think I've still got your mobile number
in my phone from our last meeting at OSH . . . I think that
was 2007. Does your number still end in 6966?
Bob . . .
Bob: Thank you for your concern about our health. We are well. Renewed my
3rd class last Sept but have not been flying much. Aim to change that if
spring ever gets here. The RV-8 (N228GM)is complete but not yet finished.
Have had a fun time with instrumentation. I finally had to get the Grand
Rapids (EIS) people to talk to the Precision people to learn that I had to
use 12v thru a pull up resister instead of 5v because my instrument is not
sensitive enough for the 5. I've made the change but not yet tested it to
see if I finally have a tach indication. I've also been learning about
batteries.
I will examine the antenna lead and reinstall the antenna. You are correct
that only one (pilot)had reported a weak signal. That one we will take under
advisement and your suggestion to do a specific com test sounds good and we
will do it. Don't have a SWR meter and I'd have to learn how to use one if I
had. My cell number is 517 206 5418. Look forward to talking to you.
Gordon
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