In , "Randy" wrote:


"Frank Gilliland" wrote in message
.. .
In , "Randy" wrote:

I drive a 9900 International. I am getting a loud whine in the CB
speaker,
but not in the radio speakers, even though they share the dual antennas.
The
whine increases and decreases with the rpms of the motor. After
disconnecting the coax from the CB transceiver the whine is gone. Does
this
mean the coax or antennas are definitely the problem? ... or are they
just
picking up on a problem with the alternator? The coax will be extremely
hard
to replace, maybe impossible since this is a company truck. The
alternator
would probably be easier to repair.

Any help to eliminate or even reduce the whine would be greatly
appreciated.


What brand/model radio are you using?




I am using a Cobra 29 NW right out of the box.

Antennas are 4' Firestiks II

swr ~ 3


Your SWR is high. High SWR isn't responsible for whine, but it is a good
indicator of other problems. From what you said in your other post your cab roof
is fiberglass, so you don't have any ground plane -at all- for your antenna. But
even that isn't responsible for the whine. I suspect that the radio isn't very
well grounded. The mounting bracket should be bolted directly to the dash or
some other chassis metal, and the negative power lead should be as short as
possible (inches) to the same. You can also try a noise filter on your positive
power lead, and tap the wire as close to the radio as possible. That should
eliminate your whine. It should also get your SWR down below 3.

As for your antenna, you need to find a point on the rig where the antenna can
be mounted directly to the chassis. A mirror mount is ok if the bracket and door
are well grounded. A 9' whip on the front bumper isn't a bad choice either
(don't forget to tie it back a bit so it doesn't flop around). You could also
try one of those 'no-ground-plane' antennas but don't expect great results. Ask
around the watering holes and see what others have done.





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Frank Gilliland wrote:
A 9' whip on the front bumper
isn't a bad choice either (don't forget to tie it back a bit so it
doesn't flop around).

Don't see many of those in these parts, but it might work.

--
http://www.allpar.com/mopar.html

In , Steveo
wrote:

Frank Gilliland wrote:
A 9' whip on the front bumper
isn't a bad choice either (don't forget to tie it back a bit so it
doesn't flop around).

Don't see many of those in these parts, but it might work.


It's not real popular, but I'm seeing it more and more -- probably due to the
increasing number of plastic tractors on the road.





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Your SWR is high. High SWR isn't responsible for whine, but it is a good
indicator of other problems. From what you said in your other post your
cab roof
is fiberglass, so you don't have any ground plane -at all- for your
antenna. But
even that isn't responsible for the whine. I suspect that the radio isn't
very
well grounded. The mounting bracket should be bolted directly to the dash
or
some other chassis metal, and the negative power lead should be as short
as
possible (inches) to the same. You can also try a noise filter on your
positive
power lead, and tap the wire as close to the radio as possible. That
should
eliminate your whine. It should also get your SWR down below 3.

As for your antenna, you need to find a point on the rig where the antenna
can
be mounted directly to the chassis. A mirror mount is ok if the bracket
and door
are well grounded. A 9' whip on the front bumper isn't a bad choice either
(don't forget to tie it back a bit so it doesn't flop around). You could
also
try one of those 'no-ground-plane' antennas but don't expect great
results. Ask
around the watering holes and see what others have done.




I thought that because the whine went away when I disconnected the coax that
the problem was not related to the power supply and one of those noise
filters would not be of much use.
My biggest obstacle is that this is a company truck. The CB, radio and TV
are all using these antennas thru some kind of combiner. Running new coax
would mean drilling holes in the cab. I am not sure how my boss would feel
about this. If it were my truck I would rip it all out and start from
scratch but I must do the best I can with what I have.
The antennas are mirror mounts. I have been reading about grounding. I
thought that two antennas actually were better on the fiberglass vehicles
because they could create a ground plane between each other. My antennas use
a plastic insert to keep them from being grounded to the mirrors. If I
ground them would this short out the transmitter?

I appreciate your feedback Frank, I know that it is difficult to diagnose
something from a distance but I am willing to try anything except routing
new coax.

In , "Randy" wrote:

snip
I thought that because the whine went away when I disconnected the coax that
the problem was not related to the power supply and one of those noise
filters would not be of much use.


You said the noise is not present on your broadcast radio, which tells me that
the noise isn't coming from the antenna. If the noise goes away when you
disconnect the coax then it must be being picked up by the coax shield. If the
coax shield were grounded then the CB would not hear the noise. Since the coax
shield is connected to the chassis of the CB, that means the CB isn't grounded
(by 'grounded' I mean an RF ground). The radio should be grounded by mounting it
directly to the metal chassis and using a very short negative power lead. The
noise filter helps prevent noise from any possible ground-loops or other RF
feedback paths.


My biggest obstacle is that this is a company truck. The CB, radio and TV
are all using these antennas thru some kind of combiner.


......yikes!


Running new coax
would mean drilling holes in the cab. I am not sure how my boss would feel
about this. If it were my truck I would rip it all out and start from
scratch but I must do the best I can with what I have.


Your boss wants you to deliver the payload in the shortest amount of time with
the least amount of hassles. To do your job well, local communication with a
good CB is -extremely- helpful, and almost essential for a long-haul driver.


The antennas are mirror mounts. I have been reading about grounding. I
thought that two antennas actually were better on the fiberglass vehicles
because they could create a ground plane between each other. My antennas use
a plastic insert to keep them from being grounded to the mirrors. If I
ground them would this short out the transmitter?


Dual antennas have no practical advantage over a single antenna in a mobile
installation. They do not create a ground plane between them, nor do they work
as a counterpoise to each other. They do look cool, but if I were you I would
just use one and avoid the hassle.

As for the antenna mount, the shield of the coax should be -well- connected to
the chassis (ground-plane), and the center conductor to the antenna. The plastic
insert is used to keep the two apart. If you disconnect the coax at the radio
and check it with an ohmmeter (center conductor to the shield), it should be
wide open; i.e, -not- shorted.


I appreciate your feedback Frank, I know that it is difficult to diagnose
something from a distance but I am willing to try anything except routing
new coax.


Don't spend -your- time or money -- convince your boss that you need a CB radio,
then get him to have his contracted radio shop do a proper installation. That's
what most trucking companies do, and I'm suprised your's doesn't.






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From: (TwistyguzzleNutz)
(Twistedhed) wrote in news:10046-40AB6ECC-8
@storefull-3252.bay.webtv.net:
What started it? N8wwm getting his clock cleaned after harassing cbers
for discussing various aspects of radio.

Lets rephrase and have you tell the truth, for

talking about Illegal Cb activities



LOL..yea,,and there is your incompetence,,,,,you cry about the SUBJECT
matter, just like N8 and his defenders of his bile, like yourself.


His butties KC8LDO, N7VCF,
WA3MOJ and N3CVJ all ran to defend him and his (felonious) law breaking
ways while harassing others.

I have never seen anyone of the Hams you

mention defending his felonious law breaking.



Only because your retainment is poor,,epitomized by your massive deficit
in communications. Besides,,thse who matter HAVE seen it.
_
They pushed too hard and sealed their own reputations as law breaking
lids and have been angry ever since.

So you are saying the Hams you named are

all law breakers?



That communication deficit again from whcih you suffer really has you in
binds,,,try again,,,what I said , it just waht I meant,,,,
"They pushed too hard and sealed their own reputations as law breaking
lids and have been angry ever since."

Yes,, N8 has broken the law,,,yes, Lelnad has broken the law, even made
posts trying to obtain information on how to circumvent the law,,,,yes,
N3CVJ has broken the law,,
_
Hence their tired acts of trying to get off-topic personal information
on those they are unable to debate intelligently. When the tables are
turned, they begin to menstruate all over this group.

You have every ham whom you named

personal information,



Yes,,,but that is not by my doings or my hand.

we have from you a cartoon character name,



And you can't get over that fact..it bothers you to no end.

you goons from rec.radio have taken to

showing up at said hams homes. you, nor

steve nor the whole 5 of you who make up the
keyclowns won't have enough balls to post

thier real name or address.



I'm taking a quote from you,,,But,,according to Frank, he presented my
name AND my address, in fact, he claimed he has produced it many times.

So it is you, and your ilk that menstrates when
asked who you really are if you are all that is

holy as you say you are you should have a

problem saying who you really are.



Wrong. Cb uses handles, not personal identification methods. Asking for
personal identification of cbers is off-topic, a personal problem of
those seeking it, and not the manner in which cb operates.


Every ham

out here who has posted his call has more

gumption and backbone than you ever will.



Not at all true, We have felons that you defend and there have been many
hammie sthat have posted their call with no interest in those cbers who
do not identify themselves. In fact, only those who have a malicious
personal agenda are preoccupied with others identities. Look, at every
turn, one can find experts stressing the need for certain privacy on the
net,,,because a few of you clowns screwed up and decided to act the fool
and play games and harass people while posting your calls illustrates
*your* lack of integrity and intellect, honesty, true character,
ignorance and agendas,,not anyone elses. Stop looking to others to blame
for your foul ups.


nothing you say should be taken with any truth
you are an anonymous cartoon character,

nothing more nothing less



And you posted this with no call, illlustrating the hypocrite you have
always been when made to adhere to your own non-sensical warblings. Once
again, cb is anonymous, get over yourself.

In ,
(Twistedhed) wrote:

snip
I'm taking a quote from you,,,But,,according to Frank, he presented my
name AND my address, in fact, he claimed he has produced it many times.


Are you referring to me or N7VCF?



=============

http://tinyurl.com/ytcah
http://tinyurl.com/2yor7

=============

"...but I admitted I was wrong, Like a man! Something you and QRM
have a problem with. You guys are wrong and you both know it and
are both too small to admit it."
---- Twistedhed ----

=============


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On Thu, 20 May 2004 11:45:11 -0400, (Twistedhed)
wrote:

So you are saying the Hams you named are

all law breakers?



N3CVJ has broken the law,,


Prove it.

What "laws" have I broken that you, yourself, are not similarly guilty
of?


People in glass houses......


Dave
"Sandbagger"
http://home.ptd.net/~n3cvj

From: (Dave=A0Hall)
On Thu, 20 May 2004 11:45:11 -0400, (Twistedhed)
wrote:
So you are saying the Hams you named are
all law breakers?
N3CVJ has broken the law,,

Prove it.


You already have,,many times in your past posts. In fact, you have
admitted to it on many occasion. Most recently, Mopar presented one of
your posts concerning your amp use on cb...let's see..you have admitted
to owning an illegal amp,,a "Dave -made". Claiming you used it only on
hamie freqs is not only a laugh, but a lie, as the amp is not allowed to
be bought or sold,,,of course, you can always say it was traded or given
to yourself in an attempt to meander around the law, but none believe
your claims anymore. Besides, you haev posted some gems concerning such
acts as "getting around the law".


What "laws" have I broken that you, yourself,

are not similarly guilty of?


Justifying your illegal behavior by pointing to another's behavior
doesnt cut it.


People in glass houses......


Oh, but I didn't begin with the stone throwing,,you did and were called
on it long ago and you have never moved beyond it. Remember, I'm not the
one justifying my behavior, nor have I ever tried. You, on the other
hand, have attempted excuse after excuse for your illegal radio
behaviors in the past and are loathe to admit your actions. I readily
admit freebanding and respond only when addressed concerning such and I
have never attempted to placate my freebanding by pointing to your or
any other's illegal actions..such behavior is reserved for yourself,
one who needs blame others for his actions,,,,,a classic case of not
being able to stand and accept responsiblity for your own actions.


Dave

"Sandbagger"

http://home.ptd.net/~n3cvj

N3CVJ

On Fri, 21 May 2004 11:39:19 -0400, (Twistedhed)
wrote:

From: (Dave*Hall)
On Thu, 20 May 2004 11:45:11 -0400, (Twistedhed)
wrote:
So you are saying the Hams you named are
all law breakers?
N3CVJ has broken the law,,

Prove it.


You already have,,many times in your past posts. In fact, you have
admitted to it on many occasion. Most recently, Mopar presented one of
your posts concerning your amp use on cb...let's see..you have admitted
to owning an illegal amp,,a "Dave -made". Claiming you used it only on
hamie freqs is not only a laugh, but a lie, as the amp is not allowed to
be bought or sold,,,of course, you can always say it was traded or given
to yourself in an attempt to meander around the law, but none believe
your claims anymore.

I also have a Texas Star. Both amps are legal for me to use on the
hams bands, once the proper RFI modifications were performed.

I did get the Dave Made amp in exchange for services rendered. Some of
my former radio customers often ran a bit low on cash. I was always
willing to entertain equitable trade opportunities.


Besides, you haev posted some gems concerning such
acts as "getting around the law".


What "laws" have I broken that you, yourself,

are not similarly guilty of?


Justifying your illegal behavior by pointing to another's behavior
doesnt cut it.

If you are going to accuse other people of being "lawbreakers", while
you yourself are guilty of the same, is pure hypocrisy.




People in glass houses......


Oh, but I didn't begin with the stone throwing,,you did and were called
on it long ago and you have never moved beyond it. Remember, I'm not the
one justifying my behavior, nor have I ever tried.

And THAT is the root of your problem. You have no shame. A classic
sign of anti-social personality disorder.


You, on the other
hand, have attempted excuse after excuse for your illegal radio
behaviors in the past and are loathe to admit your actions.

Who's "loathe" to admit anything? If it is google searchable, that
means that I said it. If I were ashamed of it, I simply would not have
admitted to it.

readily
admit freebanding and respond only when addressed concerning such and I
have never attempted to placate my freebanding by pointing to your or
any other's illegal actions..such behavior is reserved for yourself,
one who needs blame others for his actions,,,,,a classic case of not
being able to stand and accept responsiblity for your own actions.

The thing is I am no longer operating illegally in any manner. You
however, are. I have accepted the wisdom of following the law. When
will you mature enough to do the same?



Dave
"Sandbagger"

http://home.ptd.net/~n3cvj


N3CVJ

You must really love my call. Jealous?