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DIY Extended Range WiFi Repeater for the Boat
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Wayne.B
Nov 14, 2012, 7:13:31 AM11/14/12
to
There are a number of pre-packaged solutions available at different
price points but here is a good blog description of how to do it
yourself:
http://mvvikingstar.blogspot.com/2012/11/wifi-repeater-for-boat.html
price points but here is a good blog description of how to do it
yourself:
http://mvvikingstar.blogspot.com/2012/11/wifi-repeater-for-boat.html
threep...@live.com
Nov 14, 2012, 9:46:47 AM11/14/12
to
<http://www.dd-wrt.com/site/index>
It gives you lots of control over your router and lets you turn it into a bridge, wireless repeater, etc. Pretty cool.
Message has been deleted
amdx
Nov 14, 2012, 2:50:48 PM11/14/12
to
On 11/14/2012 11:58 AM, gfre...@aol.com wrote:
> I think the guy is wrong about the 12v thing. There is no way I would
> connect directly to the 12-15v noisy supply the boat has. Far better
> is to get a car adapter and use 5v worth of clean power.
>
> I do know someone who used 2 old DSS dishes and connected from Estero
> to a high rise on the beach. He just extended the external antenna
> from the router and WiFi cards to the sweet spot in the dish where the
> LNA goes. There was no other hacking.
> It worked until the dish in Estero was hit by lightning.
>
I posted the link on a wifi newsgroup and the resident guru said,
"The Bullet2HP runs on anything between 10VDC and 24VDC. The problem
is that if the CAT5 cable for the home made PoE system is very long,
the delivered voltage will be towards the low end of the range. That
works, but not when run from variable sources (car battery and solar
panel). The official HD27012 PoE adapter starts with 15VDC.?
Mikek
> connect directly to the 12-15v noisy supply the boat has. Far better
> is to get a car adapter and use 5v worth of clean power.
>
> I do know someone who used 2 old DSS dishes and connected from Estero
> to a high rise on the beach. He just extended the external antenna
> from the router and WiFi cards to the sweet spot in the dish where the
> LNA goes. There was no other hacking.
> It worked until the dish in Estero was hit by lightning.
>
I posted the link on a wifi newsgroup and the resident guru said,
"The Bullet2HP runs on anything between 10VDC and 24VDC. The problem
is that if the CAT5 cable for the home made PoE system is very long,
the delivered voltage will be towards the low end of the range. That
works, but not when run from variable sources (car battery and solar
panel). The official HD27012 PoE adapter starts with 15VDC.?
Mikek
BAR
Nov 14, 2012, 8:10:09 PM11/14/12
to
In article <696df$50a3f5a1$d8baaf04$9...@KNOLOGY.NET>, am...@knology.net
says...
In 1986 AT&T came out with some new modems. The RS232 spec state 3VDC to
25VDC. These new AT&T modems were only pushing 3VDC and our high
impedance circuit couldn't pick up the single to monitor the traffic
between the FEP and the modem.
says...
25VDC. These new AT&T modems were only pushing 3VDC and our high
impedance circuit couldn't pick up the single to monitor the traffic
between the FEP and the modem.
Message has been deleted
Wayne.B
Nov 15, 2012, 9:04:09 PM11/15/12
to
On Thu, 15 Nov 2012 20:29:09 -0500, bay...@pacbel.net wrote:
>>25VDC. These new AT&T modems were only pushing 3VDC ...
>
>If you are saying that a "Logic 0" is - 3VDC and a "Logic 1" is +3
>VDC, that is just wrong.
=========
http://en.wikipedia.org/wiki/RS-232
Voltage levels
The RS-232 standard defines the voltage levels that correspond to
logical one and logical zero levels for the data transmission and the
control signal lines. Valid signals are either in the range of +3 to
+15 volts (logic 0), or the range -3 to -15 volts (logic 1); the range
between -3 to +3 volts is not a valid RS-232 level. Data signals and
control signals use opposite polarity to represent a "true" or logic 1
asserted state. For data transmission lines (TxD, RxD and their
secondary channel equivalents) logic one is defined as a negative
voltage, the signal condition is called marking. Logic zero is
positive and the signal condition is termed spacing. Control signals
have the opposite polarity; the asserted state is positive voltage and
the inactive state is negative voltage. Examples of control lines
include request to send (RTS), clear to send (CTS), data terminal
ready (DTR), and data set ready (DSR).
The standard specifies a maximum open-circuit voltage of 25 volts:
signal levels of ą5 V, ą10 V, ą12 V, and ą15 V are all commonly seen
depending on the voltages available to the line driver circuit. Some
RS-232 driver chips have inbuilt circuitry to produce the required
voltages from a 5 volt supply. RS-232 drivers and receivers must be
able to withstand indefinite short circuit to ground or to any voltage
level up to ą25 volts. The slew rate, or how fast the signal changes
between levels, is also controlled.
>>25VDC. These new AT&T modems were only pushing 3VDC ...
>
>If you are saying that a "Logic 0" is - 3VDC and a "Logic 1" is +3
>VDC, that is just wrong.
=========
http://en.wikipedia.org/wiki/RS-232
Voltage levels
The RS-232 standard defines the voltage levels that correspond to
logical one and logical zero levels for the data transmission and the
control signal lines. Valid signals are either in the range of +3 to
+15 volts (logic 0), or the range -3 to -15 volts (logic 1); the range
between -3 to +3 volts is not a valid RS-232 level. Data signals and
control signals use opposite polarity to represent a "true" or logic 1
asserted state. For data transmission lines (TxD, RxD and their
secondary channel equivalents) logic one is defined as a negative
voltage, the signal condition is called marking. Logic zero is
positive and the signal condition is termed spacing. Control signals
have the opposite polarity; the asserted state is positive voltage and
the inactive state is negative voltage. Examples of control lines
include request to send (RTS), clear to send (CTS), data terminal
ready (DTR), and data set ready (DSR).
The standard specifies a maximum open-circuit voltage of 25 volts:
signal levels of ą5 V, ą10 V, ą12 V, and ą15 V are all commonly seen
depending on the voltages available to the line driver circuit. Some
RS-232 driver chips have inbuilt circuitry to produce the required
voltages from a 5 volt supply. RS-232 drivers and receivers must be
able to withstand indefinite short circuit to ground or to any voltage
level up to ą25 volts. The slew rate, or how fast the signal changes
between levels, is also controlled.
Message has been deleted
BAR
Nov 15, 2012, 10:16:48 PM11/15/12
to
In article <kb5ba851gqambaagu...@4ax.com>,
bay...@pacbel.net says...
I was talking about the voltages being two low at 3VDC to enable us to
see the signals with our high impedance taps. Yes, we put a tap in-
between the modem and the front end. It enabled us to collect all of the
data on the line.
Most of the modems of the 70's and 80's were pushing 12VDC.
bay...@pacbel.net says...
> >The RS232 spec state 3VDC to
> >25VDC. These new AT&T modems were only pushing 3VDC ...
>
> If you are saying that a "Logic 0" is - 3VDC and a "Logic 1" is +3
> VDC, that is just wrong.
Where did I state that?
>
> If you are saying that a "Logic 0" is - 3VDC and a "Logic 1" is +3
> VDC, that is just wrong.
I was talking about the voltages being two low at 3VDC to enable us to
see the signals with our high impedance taps. Yes, we put a tap in-
between the modem and the front end. It enabled us to collect all of the
data on the line.
Most of the modems of the 70's and 80's were pushing 12VDC.
BAR
Nov 15, 2012, 10:17:18 PM11/15/12
to
In article <gl7ba81vidk2gtgll...@4ax.com>,
waynebatr...@hotmail.com says...
waynebatr...@hotmail.com says...
>
> On Thu, 15 Nov 2012 20:29:09 -0500, bay...@pacbel.net wrote:
>
> >On Wed, 14 Nov 2012 20:10:09 -0500, BAR <sc...@you.com> wrote:
> >
> >>The RS232 spec state 3VDC to
> >>25VDC. These new AT&T modems were only pushing 3VDC ...
> >
> >If you are saying that a "Logic 0" is - 3VDC and a "Logic 1" is +3
> >VDC, that is just wrong.
>
> =========
>
> http://en.wikipedia.org/wiki/RS-232
>
> Voltage levels
>
> The RS-232 standard defines the voltage levels that correspond to
> logical one and logical zero levels for the data transmission and the
> control signal lines. Valid signals are either in the range of +3 to
> +15 volts (logic 0), or the range -3 to -15 volts (logic 1); the range
> between -3 to +3 volts is not a valid RS-232 level. Data signals and
> control signals use opposite polarity to represent a "true" or logic 1
> asserted state. For data transmission lines (TxD, RxD and their
> secondary channel equivalents) logic one is defined as a negative
> voltage, the signal condition is called marking. Logic zero is
> positive and the signal condition is termed spacing. Control signals
> have the opposite polarity; the asserted state is positive voltage and
> the inactive state is negative voltage. Examples of control lines
> include request to send (RTS), clear to send (CTS), data terminal
> ready (DTR), and data set ready (DSR).
>
> The standard specifies a maximum open-circuit voltage of 25 volts:
> signal levels of ±5 V, ±10 V, ±12 V, and ±15 V are all commonly seen
> On Thu, 15 Nov 2012 20:29:09 -0500, bay...@pacbel.net wrote:
>
> >On Wed, 14 Nov 2012 20:10:09 -0500, BAR <sc...@you.com> wrote:
> >
> >>The RS232 spec state 3VDC to
> >>25VDC. These new AT&T modems were only pushing 3VDC ...
> >
> >If you are saying that a "Logic 0" is - 3VDC and a "Logic 1" is +3
> >VDC, that is just wrong.
>
> =========
>
> http://en.wikipedia.org/wiki/RS-232
>
> Voltage levels
>
> The RS-232 standard defines the voltage levels that correspond to
> logical one and logical zero levels for the data transmission and the
> control signal lines. Valid signals are either in the range of +3 to
> +15 volts (logic 0), or the range -3 to -15 volts (logic 1); the range
> between -3 to +3 volts is not a valid RS-232 level. Data signals and
> control signals use opposite polarity to represent a "true" or logic 1
> asserted state. For data transmission lines (TxD, RxD and their
> secondary channel equivalents) logic one is defined as a negative
> voltage, the signal condition is called marking. Logic zero is
> positive and the signal condition is termed spacing. Control signals
> have the opposite polarity; the asserted state is positive voltage and
> the inactive state is negative voltage. Examples of control lines
> include request to send (RTS), clear to send (CTS), data terminal
> ready (DTR), and data set ready (DSR).
>
> The standard specifies a maximum open-circuit voltage of 25 volts:
> depending on the voltages available to the line driver circuit. Some
> RS-232 driver chips have inbuilt circuitry to produce the required
> voltages from a 5 volt supply. RS-232 drivers and receivers must be
> able to withstand indefinite short circuit to ground or to any voltage
> level up to ±25 volts. The slew rate, or how fast the signal changes
> RS-232 driver chips have inbuilt circuitry to produce the required
> voltages from a 5 volt supply. RS-232 drivers and receivers must be
> able to withstand indefinite short circuit to ground or to any voltage
> between levels, is also controlled.
He can also take a look at NRZ and NRZI
BAR
Nov 15, 2012, 10:17:59 PM11/15/12
to
In article <u98ba8tai958gkapr...@4ax.com>,
bay...@pacbel.net says...
>
> On Thu, 15 Nov 2012 21:04:09 -0500, Wayne.B
> <waynebatr...@hotmail.com> wrote:
>
> Then, I rephrase:
bay...@pacbel.net says...
>
> On Thu, 15 Nov 2012 21:04:09 -0500, Wayne.B
> <waynebatr...@hotmail.com> wrote:
>
> Then, I rephrase:
>
> > the range
> >between -3 to +3 volts is not a valid RS-232 level
Tell that to AT&T.
> > the range
> >between -3 to +3 volts is not a valid RS-232 level
Message has been deleted
BAR
Nov 15, 2012, 10:50:05 PM11/15/12
to
In article <stcba8tehd4u4a3us...@4ax.com>,
bay...@pacbel.net says...
> What DID you state. RS-232 requires a voltage differential. What was
> it?
I never said it needed a voltage differential. I stated that the voltage
spec was 3VDC to 25VDC. 12VDC was the typical and customary voltage that
the USARTS and UARTS pushed. My company did network performance
monitoring on point to point and multi-point communications lines. We
did all of the airline protocols and most of the other standard
protocols. We could even application performance monitoring from the
network perspective. We were cutting edge.
bay...@pacbel.net says...
> it?
I never said it needed a voltage differential. I stated that the voltage
spec was 3VDC to 25VDC. 12VDC was the typical and customary voltage that
the USARTS and UARTS pushed. My company did network performance
monitoring on point to point and multi-point communications lines. We
did all of the airline protocols and most of the other standard
protocols. We could even application performance monitoring from the
network perspective. We were cutting edge.
Message has been deleted
Meyer
Nov 16, 2012, 2:08:15 AM11/16/12
to
On 11/15/2012 11:37 PM, bay...@pacbel.net wrote:
> No, you were idiots. If you don't understand that the RS232 standard
> relied on a voltage differential to delineate Mark and Space, you
> anything but "cutting edge," you were idiots.
>
Sorry to butt into your pissing contest but, which RS232 standard are
you referring to? There have been several revisions over the years. I
was involved with DTE and DCE for decades, however my recollection of
RS232 has faded with the technology.
A quick Wiki produced the following-
> relied on a voltage differential to delineate Mark and Space, you
> anything but "cutting edge," you were idiots.
>
Sorry to butt into your pissing contest but, which RS232 standard are
you referring to? There have been several revisions over the years. I
was involved with DTE and DCE for decades, however my recollection of
RS232 has faded with the technology.
A quick Wiki produced the following-
threep...@live.com
Nov 16, 2012, 6:43:55 AM11/16/12
to
On Thursday, November 15, 2012 11:38:34 PM UTC-5, bay...@pacbel.net wrote:
+/- 3vdc are valid 232 signals, but just barely. And I understood exactly what BAR was saying, but then again I wasn't trying to be an asshole.
> No, you were idiots. If you don't understand that the RS232 standard
> relied on a voltage differential to delineate Mark and Space, you
> anything but "cutting edge," you were idiots.
Sorry, but RS232 relies on a voltage *level* as seen from a ground reference (i.e. single ended). RS422/485 operates with a voltage *differential* between two wires (i.e. twisted pair) with no reference to ground.
> relied on a voltage differential to delineate Mark and Space, you
> anything but "cutting edge," you were idiots.
+/- 3vdc are valid 232 signals, but just barely. And I understood exactly what BAR was saying, but then again I wasn't trying to be an asshole.
BAR
Nov 16, 2012, 8:01:07 AM11/16/12
to
In article <92682fdf-0cb1-4357...@googlegroups.com>,
threep...@live.com says...
I worked with Convergent Technologies CTOS (also known as Burroughs
BTOS) which used RS422. It was a speedy little network.
threep...@live.com says...
BTOS) which used RS422. It was a speedy little network.
threep...@live.com
Nov 16, 2012, 8:46:29 AM11/16/12
to
On Friday, November 16, 2012 8:01:42 AM UTC-5, BAR wrote:
>
> I worked with Convergent Technologies CTOS (also known as Burroughs
> BTOS) which used RS422. It was a speedy little network.
I work for a console communications company. We've run into you guys in the past.
>
> I worked with Convergent Technologies CTOS (also known as Burroughs
> BTOS) which used RS422. It was a speedy little network.
Our previous generation equipment had serial data connections from the CRE (central rack equip) out to the console positions. The could be configured to be RS232 or RS422. The ONLY reason to use 232 is if you needed to remote a console a long distance or across a microwave (now fiber) MUX using modems. Otherwise, everything was 38.4kb RS422 typically over unshielded, twisted pair.
The new generation system is completely IP (VoIP). SIP telephony, even most of the new radio equipment has direct IP connectivity. Pretty much no back room equipment anymore, the network and a couple of PCs are the audio switch.
Message has been deleted
Message has been deleted
Wayne.B
Nov 17, 2012, 7:12:14 PM11/17/12
to
On Sat, 17 Nov 2012 18:38:36 -0500, bay...@pacbel.net wrote:
>Except on boats where some units can be software configured for RS232
>or RS422.
===
KVH (a leading vendor of marine satellite TV systems) is still using
an RS-232 port for configuration commands.
>or RS422.
===
KVH (a leading vendor of marine satellite TV systems) is still using
an RS-232 port for configuration commands.
Message has been deleted
threep...@live.com
Nov 18, 2012, 10:20:00 AM11/18/12
to
>
>
> KVH (a leading vendor of marine satellite TV systems) is still using
> an RS-232 port for configuration commands.
amdx
Nov 18, 2012, 10:55:04 AM11/18/12
to
The Bullet2HP needs a power supply. The Bullet2HP will operate properly
between 10VDC and 24VDC. With a long run of cable you will have a
voltage drop, this voltage drop is dependent on current and wire
resistance and length. If your source voltage varies (car battery and
solar panel) the device may not work properly.
All this talk about RS-232 and other standards is moot because that
is all generated internal to the Bullet2HP and I don't believe there
is any adjustment.
Mikek
Wayne.B
Nov 18, 2012, 11:55:27 AM11/18/12
to
On Sun, 18 Nov 2012 09:55:04 -0600, amdx <am...@knologynotthis.net>
wrote:
>
> This seems to have went off course. I believe the point here was,
>The Bullet2HP needs a power supply. The Bullet2HP will operate properly
>between 10VDC and 24VDC. With a long run of cable you will have a
>voltage drop, this voltage drop is dependent on current and wire
>resistance and length. If your source voltage varies (car battery and
>solar panel) the device may not work properly.
===
Yes. On our boat we are using a 24 volt POE injector which is easily
powered by any small inverter. The raw 12 volt power on a boat is
subject to a lot of noise and variability. Unless a unit is
specifically designed to handle that environment it's better to avoid
it. The inverter is also useful of course for charging lap tops, cell
phones and battery operated tools.
wrote:
>
> This seems to have went off course. I believe the point here was,
>The Bullet2HP needs a power supply. The Bullet2HP will operate properly
>between 10VDC and 24VDC. With a long run of cable you will have a
>voltage drop, this voltage drop is dependent on current and wire
>resistance and length. If your source voltage varies (car battery and
>solar panel) the device may not work properly.
Yes. On our boat we are using a 24 volt POE injector which is easily
powered by any small inverter. The raw 12 volt power on a boat is
subject to a lot of noise and variability. Unless a unit is
specifically designed to handle that environment it's better to avoid
it. The inverter is also useful of course for charging lap tops, cell
phones and battery operated tools.
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