Double Super Hetrodyne what does this do in a CB Radio ?
 

Hi, Does anyone know What Double Super Hetrodyne does in a CB radio.
I have a GE 40 channel cb and it has Double Super Hetrodyne.
Brian - Las Vegas

Double Super Hetrodyne what does this do in a CB Radio ?
 

Brian,

Without going into the technical aspects, I'll simply say that
a double-conversion superheterodyne receiver offers improved
sensitivity and selectivity over a single-conversion superhet.
In the early days of CB (ie, the 1960s), the majority of CB
sets used a single-conversion receiver, while some of the high-
end models used double-conversion. As CB became more populer
in the late 1960s and more stations came on the air, it became
necessary to improve receiver selectivity to reduce the problem
of "bleedover" from adjacent channels. With that in mind, the
majority of CB manufacturers began using double superhets for
even their "cheap" radios, and from then on it became standard
practice.

If you would like to learn about the technical reasons for all
of this, pay a visit to your public library and look for an
ARRL Radio Amateur's Handbook, and read up on receiver theory
and design.

73,
Dean K5DH


In article ,
says...

Hi, Does anyone know What Double Super Hetrodyne does in a CB radio.
I have a GE 40 channel cb and it has Double Super Hetrodyne.
Brian - Las Vegas

Double Super Hetrodyne what does this do in a CB Radio ?
 

Since citizens band is operating at about 27 MHz, the standard i.f. of .455
MHz allows an image of twice the i.f. frequency (.91 MHz). This image is
not rejected by the tuned circuits of the cb rig. So, double conversion is
used. In this specific case, the selectivity is not increased, but the
image rejection is. Often the first i.f. is in the 5 to 10 MHz range.
Recently, with the use of low noise mixers, the first i.f. can be at 40 MHz
or higher, which provides excellent image rejection.

Bottom line is that most cb radios that are average or better use double
conversion. In the case of your GE unit, the marketing department decided
to add a little hype to an rather ordinary cb unit and called it a Double
Super Hetrodyne. Is your radio a special radio? No. Is it worth more? No.

Colin K7FM

Double Super Hetrodyne what does this do in a CB Radio ?
 

the first if is on 10.7 , and use commercial ceramic filters auns the second
one is on 455 khz and also use ceramic filters !!! a simply question of
cost.... f4ere serge.
"Captain Crane" a écrit dans le message de news:
...
Hi, Does anyone know What Double Super Hetrodyne does in a CB radio.
I have a GE 40 channel cb and it has Double Super Hetrodyne.
Brian - Las Vegas

Double Super Hetrodyne what does this do in a CB Radio ?
 

"Captain Crane" wrote in message
...
Hi, Does anyone know What Double Super Hetrodyne does in a CB radio.
I have a GE 40 channel cb and it has Double Super Hetrodyne.
Brian - Las Vegas


The straight answer? Double conversion is used to reduce images.


It does nothing for sensitivity or selectivity in itself; and it probably
decreases dynamic range and makes the receiver more prone
to spurious responses.

Pete

Double Super Hetrodyne what does this do in a CB Radio ?
 

Captain Crane
wrote in message ...
Hi, Does anyone know What Double Super Hetrodyne does in a CB radio.
I have a GE 40 channel cb and it has Double Super Hetrodyne.
Brian - Las Vegas


My question is what the heck does this have to do with
AMATEUR BOATANCHORS?
There are dozens of CB newsgroups out there, maybe hundreds,
of course no one there could have answered this question... But still.

I know, now someone is going to say I'm being rude to new comers...


Ron

Double Super Hetrodyne what does this do in a CB Radio ?
 

On Wed, 01 Feb 2006 23:37:19 GMT, " Ron in Radio Heaven"
wrote:

Captain Crane
wrote in message ...
Hi, Does anyone know What Double Super Hetrodyne does in a CB radio.
I have a GE 40 channel cb and it has Double Super Hetrodyne.
Brian - Las Vegas


My question is what the heck does this have to do with
AMATEUR BOATANCHORS?
There are dozens of CB newsgroups out there, maybe hundreds,
of course no one there could have answered this question

Maybe that's why he asked here.

Or then again, a radio is a radio. And probably some folks here maybe
even learned something too.

73
Gary K4FMX

.. But still.

I know, now someone is going to say I'm being rude to new comers...


Ron

Double Super Hetrodyne what does this do in a CB Radio ?
 

In article , SeaView-
(known to some as Captain Crane) scribed...

Hi, Does anyone know What Double Super Hetrodyne does in a CB radio.

snippety

Yes. It gives the marketing dweebs something to write about.

I have a GE 40 channel cb and it has Double Super Hetrodyne.

There is a possibility -- a very weak one -- that this bizarre
market-speak means that the radio was designed with a double-conversion
receiver. It's impossible to say without seeing a schematic.

Why anyone would put that much effort and expense into a CB radio,
however, is beyond me. I think you're running into nothing more that
marketing buzzwords. "Double Super Heterodyne" certainly has no meaning
in the technical world.


--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute
(Known to some as Bruce Lane, KC7GR)
http://www.bluefeathertech.com -- kyrrin a/t bluefeathertech d-o=t calm
"Salvadore Dali's computer has surreal ports..."

Double Super Hetrodyne what does this do in a CB Radio ?
 

Dr. Anton T. Squeegee wrote:



There is a possibility -- a very weak one -- that this bizarre
market-speak means that the radio was designed with a double-conversion
receiver. It's impossible to say without seeing a schematic.

Why anyone would put that much effort and expense into a CB radio,
however, is beyond me. I think you're running into nothing more that
marketing buzzwords. "Double Super Heterodyne" certainly has no meaning
in the technical world.

I think it means something equivalent to "has ears and barks well into
the next county bubba 10-4 beep".

Okay, that was a nasty shot but there were indeed double-conversion rigs
back in the CB heyday. When every other trailer in the court was
running kilos of Bird-watts double talk conversion had its advantages.

We're 10-8 and on the side bubba 10-4? beep. Gotcha comin on. Beep.

I really don't know this lingo...I'm reading it off the side of a 1970s
beer mug....a cheap mug at that.

-Bill

Double Super Hetrodyne what does this do in a CB Radio ?
 

"- exray -" wrote in message
...
Dr. Anton T. Squeegee wrote:

I think it means something equivalent to "has ears and barks well into
the next county bubba 10-4 beep".

Okay, that was a nasty shot but there were indeed double-conversion rigs
back in the CB heyday. When every other trailer in the court was
running kilos of Bird-watts double talk conversion had its advantages.

We're 10-8 and on the side bubba 10-4? beep. Gotcha comin on. Beep.

I really don't know this lingo...I'm reading it off the side of a 1970s
beer mug....a cheap mug at that.

-Bill

I assumed it meant double-conversion.

Pete

Double Super Hetrodyne what does this do in a CB Radio ?
 

On 2/1/06 10:09 PM, in article ,
"Dr. Anton T. Squeegee" wrote:

In article , SeaView-
(known to some as Captain Crane) scribed...

Hi, Does anyone know What Double Super Hetrodyne does in a CB radio.

snippety

Yes. It gives the marketing dweebs something to write about.

I have a GE 40 channel cb and it has Double Super Hetrodyne.

There is a possibility -- a very weak one -- that this bizarre
market-speak means that the radio was designed with a double-conversion
receiver. It's impossible to say without seeing a schematic.

Why anyone would put that much effort and expense into a CB radio,
however, is beyond me. I think you're running into nothing more that
marketing buzzwords. "Double Super Heterodyne" certainly has no meaning
in the technical world.


They designed and built good radios, because people wanted and needed good
radios. In the beginning, there were more lofty ideals for CB; it wasn't
the cesspool it has become, but that doesn't mean it's useless.

Many CB radios were so good they were converted to 10M and were appreciated
for their advance design.

Don

Double Super Hetrodyne what does this do in a CB Radio ?
 

A funny story, Years ago I used to work on HAM equipment and ran a small
shop out of my basement. One day a CBer showed up with a Browning radio.
After repairing the fault, I noticed a design flaw. A capacitor across the
B+ was on the wrong side of the transmit relay.

It allowed sufficient B+ to keep the transmitter alive when the unit went to
receive and caused a feedback "ping".

I corrected the default in design and returned the radio to the owner. He
came back mad as a wet hen because his "Browning Ping" was gone. Being the
curmudgeon I am, I put in a LARGE cap extending the ping to nearly a second.
I thought that would really **** him off. Sad to say I had a wave of CBers
wanting me to fix their pings like the first guy.

"- exray -" wrote in message
...
Dr. Anton T. Squeegee wrote:
We're 10-8 and on the side bubba 10-4? beep. Gotcha comin on. Beep.

I really don't know this lingo...I'm reading it off the side of a 1970s

-Bill

Double Super Hetrodyne what does this do in a CB Radio ?
 

CB Radio is Still Fun !!!!. Its True DX Radio unlike using a ham -
Trunking device and repeaters like CEL Phones Do.
CB is Good Old Fashion AM ( REAL DX ) Radio.
Brian , Las Vegas

Double Super Hetrodyne what does this do in a CB Radio ?
 

Captain Crane wrote:

CB Radio is Still Fun !!!!. Its True DX Radio unlike using a ham -
Trunking device and repeaters like CEL Phones Do.
CB is Good Old Fashion AM ( REAL DX ) Radio.
Brian , Las Vegas


What does "using a ham" mean?

-Bill

Double Super Hetrodyne what does this do in a CB Radio ?
 

"- exray -" wrote in message
...
Captain Crane wrote:

CB Radio is Still Fun !!!!. Its True DX Radio unlike using a ham -
Trunking device and repeaters like CEL Phones Do.
CB is Good Old Fashion AM ( REAL DX ) Radio.
Brian , Las Vegas


What does "using a ham" mean?

-Bill

I think he intended to use It as a modifier for "trunking devices", etc. :)



I guess the CB crowd abandoned SSB for good ol' Y-AM...

Pete 10 Fer?

Double Super Hetrodyne what does this do in a CB Radio ?
 

On 2/4/06 7:29 AM, in article bL3Ff.37405$bF.14747@dukeread07, "Uncle Peter"
wrote:


"- exray -" wrote in message
...
Captain Crane wrote:

CB Radio is Still Fun !!!!. Its True DX Radio unlike using a ham -
Trunking device and repeaters like CEL Phones Do.
CB is Good Old Fashion AM ( REAL DX ) Radio.
Brian , Las Vegas


What does "using a ham" mean?

-Bill

I think he intended to use It as a modifier for "trunking devices", etc. :)



I guess the CB crowd abandoned SSB for good ol' Y-AM...

Pete 10 Fer?



There is still SSB activity on CB - Usually in the high channels.

Don

Many CB radios were so good they were converted to 10M and were appreciated
for their advance design.

Don[/quote]

advanced design?
sry om had nothing to do with advanced design

cb radios were converted to 10 meters
because they were cheap and easy
often conversion took little more than one rock and alignment

could pick up all kinds of non runing cb rigs for free
often took only a hour or two and few junk box parts
now had free cb rig ready to convert to ten meters

brand new surplus High Gain 23 channel boards
sold for as little as $12.99
less if you bought more than one board
no case, no knobs, no pots no meter or switches
few hours work, few parts
now had cheap kick around ten meter qrp lash up

at one time there were at least 25 ops
in and around Detroit running converted cb radios
don't think any of us, had more than 100 bucks invested

yes there were some very well made cb radios
there were some very poorly made cb radios

it was not advanced design
that caused so many to be converted to ten meters

Mac w8znx

Double Super Hetrodyne what does this do in a CB Radio ?
 

Captain Crane wrote:
Hi, Does anyone know What Double Super Hetrodyne does in a CB radio.
I have a GE 40 channel cb and it has Double Super Hetrodyne.
Brian - Las Vegas


Hi,

If you go to wikipedia.org and search for "superheterodyne",
it will explain the concept. The "double conversion superheterodyne"
is explained in the wikipedia article, as a method of improved receiver
image rejection. The article has plenty of links to lead you
to further information, if desired.

73,
Ed Knobloch

Double Super Hetrodyne what does this do in a CB Radio ?
 

On 2/4/06 11:49 AM, in article , "de Mac"
wrote:

Many CB radios were so good they were converted to 10M and were
appreciated
for their advance design.

Don

advanced design?
sry om had nothing to do with advanced design

cb radios were converted to 10 meters
because they were cheap and easy
often conversion took little more than one rock and alignment

could pick up all kinds of non runing cb rigs for free
often took only a hour or two and few junk box parts
now had free cb rig ready to convert to ten meters

brand new surplus High Gain 23 channel boards
sold for as little as $12.99
less if you bought more than one board
no case, no knobs, no pots no meter or switches
few hours work, few parts
now had cheap kick around ten meter qrp lash up

at one time there were at least 25 ops
in and around Detroit running converted cb radios
don't think any of us, had more than 100 bucks invested

yes there were some very well made cb radios
there were some very poorly made cb radios

it was not advanced design
that caused so many to be converted to ten meters

Mac w8znx


Don't apologize, you are correct that there were both good and mediocre CB
equipment available..... So what's new? Same with ham gear.

Some if us went for quality, not cheapest. If you convert crap you still had
crap. Mine was dual conversion and had a great noise canceller.

Don

Double Super Hetrodyne what does this do in a CB Radio ?
 

- exray - wrote:

Captain Crane wrote:

CB Radio is Still Fun !!!!. Its True DX Radio unlike using a ham -
Trunking device and repeaters like CEL Phones Do.
CB is Good Old Fashion AM ( REAL DX ) Radio.
Brian , Las Vegas


What does "using a ham" mean?

-Bill


To me its the second thing on my recipe for a ham sandwich. ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Double Super Hetrodyne what does this do in a CB Radio ?
 

" Ron in Radio Heaven" wrote in message

I know, now someone is going to say I'm being rude to new comers...


Ron



Don't worry about it Ron. Everybody seems a little meaner on Usenet. : )

That's why I use allot of smiley faces : )

BH

Double Super Hetrodyne what does this do in a CB Radio ?
 

"Fred W4JLE" wrote in message
...
A funny story, Years ago I used to work on HAM equipment and ran a small
shop out of my basement. One day a CBer showed up with a Browning radio.
After repairing the fault, I noticed a design flaw. A capacitor across the
B+ was on the wrong side of the transmit relay.

It allowed sufficient B+ to keep the transmitter alive when the unit went
to receive and caused a feedback "ping".

I corrected the default in design and returned the radio to the owner. He
came back mad as a wet hen because his "Browning Ping" was gone. Being the
curmudgeon I am, I put in a LARGE cap extending the ping to nearly a
second. I thought that would really **** him off. Sad to say I had a wave
of CBers wanting me to fix their pings like the first guy.

LOL!

BH