"Dave Platt" wrote in message
...
In article ,
Douglas W. \"Popeye\" Frederick wrote:

You still didn't give any useful information. No surpise since
you have none. For an average of the cb band running 1/4 wave
the antennas should be spaced 54 inches apart. Use a
commercially produced cophase harness if you can find it. Make
sure you match the SWR and you will out do any other mobile
off the front or rear.

Top

Thanks Top!

I think that Top's calculations (and recommendations) are a bit off?

I'm a "single antenna" guy myself.

I think, in a truck, at least, that "big radio" is synonymous with "big
wris****ch". :-)

We can't mount the antennae high or center, because the 13', 6" height of
the truck is where the low bridges start.

Also, most tractors have this horrific system that intergrates AM/FM with
the CB coax.

A CB stick on the left mirror and an AM/FM on the right, and a splitter in
the coax, so I always run my own coax seperately.

And I have a cellular antenna on one side, any way, for dual plane signal
boost, and it has to be 8" (I think) away from other sticks.

But hhhhhere's a question for the braintrust:

I'm after a (mobile) VHF radio that's common to northern (i.e., the Yukon,
and Northwest Territories) Canadian truckers- who don't monitor CB bands.

(info http://forums.qrz.com/showthread.php?t=171741

I'm sure, as a sine wave challenged layman, that I can't use the same
antenna and coax as my CB?


CB has an 11-meter wavelength. There are just over 39 inches in a
meter. Hence, the wavelength is around 430 inches.

A 54-inch separation is only .12 wavelength. From the chart in the
ARRL Antenna Book, it looks as if you'll get less than .5 dB of
directional gain, compared with a single radiator of the same type and
size. That's less than one tenth (!) of a nominal S-unit. You'd be
very hard put to be able to detect this small of a difference in
practice - it'll be less than the amount of signal variation you'll
encounter due to reflections from nearby objects.

In terms of getting yourself a directional-gain benefit, I think a
co-phased two-radiator broadside array with a 54-inch separation is
essentially useless on CB frequencies. There just isn't enough gain
to matter.

Now, as somebody else suggested, using such an array might get you a
more consistent near-omnidirectional pattern than a single radiator
would deliver, if your antennas are mounted less than optimally (e.g.
on your sideview mirror post). Using two co-phase antennas might be
worthwhile for this reason, even if you don't get a significant amount
of directional gain.

I suspect you'd get more bang for your buck by simply mounting a
single antenna in a better location (e.g. roof mount) and paying
attention to making the antenna's grounding to the chassis/groundplane
as direct and solid as possible.

--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!



--
Popeye
"Best thing for him, really. His therapy
was going nowhere," -Hannibal Lector.

www.finalprotectivefire.com
http://picasaweb.google.com/Popeye8762

On Tue, 2 Dec 2008 03:17:22 -0500, "Douglas W. \"Popeye\" Frederick"
wrote:

"Dave Platt" wrote in message
...
In article ,
Douglas W. \"Popeye\" Frederick wrote:

You still didn't give any useful information. No surpise since
you have none. For an average of the cb band running 1/4 wave
the antennas should be spaced 54 inches apart. Use a
commercially produced cophase harness if you can find it. Make
sure you match the SWR and you will out do any other mobile
off the front or rear.

Top

Thanks Top!

I think that Top's calculations (and recommendations) are a bit off?

I'm a "single antenna" guy myself.

I think, in a truck, at least, that "big radio" is synonymous with "big
wris****ch". :-)

We can't mount the antennae high or center, because the 13', 6" height of
the truck is where the low bridges start.

Also, most tractors have this horrific system that intergrates AM/FM with
the CB coax.

A CB stick on the left mirror and an AM/FM on the right, and a splitter in
the coax, so I always run my own coax seperately.

And I have a cellular antenna on one side, any way, for dual plane signal
boost, and it has to be 8" (I think) away from other sticks.

But hhhhhere's a question for the braintrust:

I'm after a (mobile) VHF radio that's common to northern (i.e., the Yukon,
and Northwest Territories) Canadian truckers- who don't monitor CB bands.

(info http://forums.qrz.com/showthread.php?t=171741

I'm sure, as a sine wave challenged layman, that I can't use the same
antenna and coax as my CB?


No dumb****.
As I have tried to explain to you once before, DO NOT buy one of those
radios. If you get caught with it in the USA alone, and are
transmitting on it, no license? Bye bye. Pay the $10,000 fine lose the
radio.

Every trucking company in Canada that uses them has a Canadian license
to operate them with. They are not like CB's. They are commercial
business radios.

I trust maybe now you'll listen to one of the radio experts for a
change.

Would one of you in the radio groups who knows Canadian radios please
explain this to the jerk?
He thinks that because he's a trucker, he can have any damn radio he
wants in his truck.

What if you ran a wire between those two truck antennas? Only
saying,,,,,
cuhulin

"richard" wrote in message
...
On Tue, 2 Dec 2008 03:17:22 -0500, "Douglas W. \"Popeye\" Frederick"
wrote:

"Dave Platt" wrote in message
...
In article ,
Douglas W. \"Popeye\" Frederick wrote:

You still didn't give any useful information. No surpise since
you have none. For an average of the cb band running 1/4 wave
the antennas should be spaced 54 inches apart. Use a
commercially produced cophase harness if you can find it. Make
sure you match the SWR and you will out do any other mobile
off the front or rear.

Top

Thanks Top!

I think that Top's calculations (and recommendations) are a bit off?

I'm a "single antenna" guy myself.

I think, in a truck, at least, that "big radio" is synonymous with "big
wris****ch". :-)

We can't mount the antennae high or center, because the 13', 6" height
of
the truck is where the low bridges start.

Also, most tractors have this horrific system that intergrates AM/FM
with
the CB coax.

A CB stick on the left mirror and an AM/FM on the right, and a splitter
in
the coax, so I always run my own coax seperately.

And I have a cellular antenna on one side, any way, for dual plane
signal
boost, and it has to be 8" (I think) away from other sticks.

But hhhhhere's a question for the braintrust:

I'm after a (mobile) VHF radio that's common to northern (i.e., the
Yukon,
and Northwest Territories) Canadian truckers- who don't monitor CB bands.

(info http://forums.qrz.com/showthread.php?t=171741

I'm sure, as a sine wave challenged layman, that I can't use the same
antenna and coax as my CB?


No dumb****.
As I have tried to explain to you once before, DO NOT buy one of those
radios.

**** you, dickhead.

If you get caught with it in the USA alone, and are
transmitting on it, no license? Bye bye. Pay the $10,000 fine lose the
radio.

Sure.

What's the fine for my 250 watt kicker?

Don't forget to add that in.

Every trucking company in Canada that uses them has a Canadian license
to operate them with. They are not like CB's. They are commercial
business radios.

I trust maybe now you'll listen to one of the radio experts for a
change.

I am.

They said the radios were available, the private frequencies, not the
radios, are licensed, and the freqs I'm interested are available to the
public.

And the license, if you want one, is easy and cheap.

Were your mother and father related -before- the wedding?

Inquiring minds want to know.

Because you have an uncanny resemblence to the Deliverance banjo boy.

Would one of you in the radio groups who knows Canadian radios please
explain this to the jerk?
He thinks that because he's a trucker, he can have any damn radio he
wants in his truck.

Jesus, are you stupid.

Try reading the thread that I cited, that flatly proves you wrong.

And as I already stated, and you apparently forgot, the radio would be for
emergencies only, and that I would have no reason to use it in the states.

Your memory is just shot, ****head, have you ever met a guy named John
Francis?

Or been to Australia?

I find it amazing that you'd be afraid of an FCC fine, that I have a
one-in-ten-million chance of -ever- receiving, while you publically brag
about being in possession of 45,000 child pornography pictures.

Amazing. Simply amazing.

--
Popeye
"Best thing for him, really. His therapy
was going nowhere," -Hannibal Lector.

www.finalprotectivefire.com
http://picasaweb.google.com/Popeye8762

In article ,
Douglas W. \"Popeye\" Frederick wrote:

But hhhhhere's a question for the braintrust:

I'm after a (mobile) VHF radio that's common to northern (i.e., the Yukon,
and Northwest Territories) Canadian truckers- who don't monitor CB bands.

(info http://forums.qrz.com/showthread.php?t=171741

I'm sure, as a sine wave challenged layman, that I can't use the same
antenna and coax as my CB?

In principle, you could combine the CB output (27 MHz) with the VHF
radio output (up above the 2-meter band) using a diplexer, and feed
the result down a single coax.

At the antenna end, you'd have a couple of choices. You can use
another diplexer to split out the HF and VHF signals, and feed them to
two separate antennas. Or, you might be able to find a single CB-type
antenna which is also capable of matching up well enough on these VHF
frequencies to work tolerably well.

The chances are very poor that a randomly-selected CB antenna would
give you a tolerable SWR on the 160-or-so-MHz VHF band... and if it
did, there's no telling what its vertical radiation pattern would look
like. An antenna intended for these two bands would probably have to
be custom designed - I can think of a couple of possible ways to do
it. Such a dualband antenna would almost certainly be a compromise
antenna on both bands - it wouldn't work as well as separate antennas
designed for best operation on a single band each.

Commercial HF/VHF diplexers run somewhere around $80, last time I
looked. You'd probably find it less expensive in the end to just run
a second coax and put up a second (VHF-only) whip antenna.

--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

"Dave Platt" wrote in message
...
In article ,
Douglas W. \"Popeye\" Frederick wrote:

But hhhhhere's a question for the braintrust:

I'm after a (mobile) VHF radio that's common to northern (i.e., the
Yukon,
and Northwest Territories) Canadian truckers- who don't monitor CB bands.

(info http://forums.qrz.com/showthread.php?t=171741

I'm sure, as a sine wave challenged layman, that I can't use the same
antenna and coax as my CB?

In principle, you could combine the CB output (27 MHz) with the VHF
radio output (up above the 2-meter band) using a diplexer, and feed
the result down a single coax.

At the antenna end, you'd have a couple of choices. You can use
another diplexer to split out the HF and VHF signals, and feed them to
two separate antennas. Or, you might be able to find a single CB-type
antenna which is also capable of matching up well enough on these VHF
frequencies to work tolerably well.

The chances are very poor that a randomly-selected CB antenna would
give you a tolerable SWR on the 160-or-so-MHz VHF band... and if it
did, there's no telling what its vertical radiation pattern would look
like. An antenna intended for these two bands would probably have to
be custom designed - I can think of a couple of possible ways to do
it. Such a dualband antenna would almost certainly be a compromise
antenna on both bands - it wouldn't work as well as separate antennas
designed for best operation on a single band each.

Commercial HF/VHF diplexers run somewhere around $80, last time I
looked. You'd probably find it less expensive in the end to just run
a second coax and put up a second (VHF-only) whip antenna.

Thanks!

That's the kind of helpful and intelligent response I was looking for.

The radio would be for emergency communications anyway, to trucks in
the -immediate- vicinity.

The 4 "LADD" frequencies are used by the scale houses up there, as well.


--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!



--
Popeye
"Best thing for him, really. His therapy
was going nowhere," -Hannibal Lector.

www.finalprotectivefire.com
http://picasaweb.google.com/Popeye8762