Hi All

I recently moved to the US and have brought with me a SEC 1223 Switch
Mode Power Supply (spec is below). It is not marked up that it can run
using 120V but i tried it and it seems to be putting out about 13.2V
on my meter. I have not stress tested it with a radio connected on
transmit.

Any thoughts?


Regards

Andy

SEC-1223 SEC 23A 13.8V Switch Mode Power Supply
* Input 230V AC * Output 13.8V DC * Output current 23A continuous (25A
peak) * Thermostatic Fan cooled * HF & VHF filtering *

The SEC-1223 switch mode power supply offers 23A of continuous current
output and 25A peak. This is more than enough for any 100W
transceiver. Designed with RF operation in mind, it is totally noise
free and utterly stable. Lighter than an IC-706 and bout the same
size, it will fit underneath for desktop operation. It will also fit
in a brief case or flight bag.

"Andiroo" wrote in message
...
Hi All

I recently moved to the US and have brought with me a SEC 1223 Switch
Mode Power Supply (spec is below). It is not marked up that it can run
using 120V but i tried it and it seems to be putting out about 13.2V
on my meter. I have not stress tested it with a radio connected on
transmit.

Any thoughts?


Regards

Andy

SEC-1223 SEC 23A 13.8V Switch Mode Power Supply
* Input 230V AC * Output 13.8V DC * Output current 23A continuous (25A
peak) * Thermostatic Fan cooled * HF & VHF filtering *

The SEC-1223 switch mode power supply offers 23A of continuous current
output and 25A peak. This is more than enough for any 100W
transceiver. Designed with RF operation in mind, it is totally noise
free and utterly stable. Lighter than an IC-706 and bout the same
size, it will fit underneath for desktop operation. It will also fit
in a brief case or flight bag.

There is a rack mount version that is internally selectable 120/220 Here's
a thread on the conversion:

http://n2.nabble.com/Samlex-SEC-1223-td382856.html

On Aug 31, 11:40*am, "JB" wrote:
"Andiroo" wrote in message

...





Hi All

I recently moved to the US and have brought with me a SEC 1223 Switch
Mode Power Supply (spec is below). It is not marked up that it can run
using 120V but i tried it and it seems to be putting out about 13.2V
on my meter. I have not stress tested it with a radio connected on
transmit.

Any thoughts?

Regards

Andy

SEC-1223 SEC 23A 13.8V Switch Mode Power Supply
* Input 230V AC * Output 13.8V DC * Output current 23A continuous (25A
peak) * Thermostatic Fan cooled * HF & VHF filtering *

The SEC-1223 switch mode power supply offers 23A of continuous current
output and 25A peak. This is more than enough for any 100W
transceiver. Designed with RF operation in mind, it is totally noise
free and utterly stable. Lighter than an IC-706 and bout the same
size, it will fit underneath for desktop operation. It will also fit
in a brief case or flight bag.

There is a rack mount version that is internally selectable 120/220 *Here's
a thread on the conversion:

http://n2.nabble.com/Samlex-SEC-1223-td382856.html- Hide quoted text -

- Show quoted text -

Hi

Thanks for the advice. I would probably need to find a service
engineer to do this as meddling with the inner of switch mode power
supplies is beyond my comfort zone. I just wondered why it seemed to
work and if i could get away without further mods or if there was a
simple switch to flick like there was on my home pc power supply (if
only!).

Thanks for the link to advice.

Andy

On Sun, 31 Aug 2008 06:25:43 -0700, Andiroo wrote:

Hi All

I recently moved to the US and have brought with me a SEC 1223 Switch
Mode Power Supply (spec is below). It is not marked up that it can run
using 120V but i tried it and it seems to be putting out about 13.2V on
my meter. I have not stress tested it with a radio connected on
transmit.

Any thoughts?


Regards

Andy

SEC-1223 SEC 23A 13.8V Switch Mode Power Supply * Input 230V AC * Output
13.8V DC * Output current 23A continuous (25A peak) * Thermostatic Fan
cooled * HF & VHF filtering *

The SEC-1223 switch mode power supply offers 23A of continuous current
output and 25A peak. This is more than enough for any 100W transceiver.
Designed with RF operation in mind, it is totally noise free and utterly
stable. Lighter than an IC-706 and bout the same size, it will fit
underneath for desktop operation. It will also fit in a brief case or
flight bag.


Some of these newer supplies can auto switch between input voltage. The
nomenclature on the spec tage will say something like....

" 90~250v "

If it says that, it's a auto switching input

Hi All

I recently moved to the US and have brought with me a SEC 1223 Switch
Mode Power Supply (spec is below). It is not marked up that it can run
using 120V but i tried it and it seems to be putting out about 13.2V
on my meter. I have not stress tested it with a radio connected on
transmit.

Any thoughts?

Regards

Andy

SEC-1223 SEC 23A 13.8V Switch Mode Power Supply
* Input 230V AC * Output 13.8V DC * Output current 23A continuous (25A
peak) * Thermostatic Fan cooled * HF & VHF filtering *

The SEC-1223 switch mode power supply offers 23A of continuous current
output and 25A peak. This is more than enough for any 100W
transceiver. Designed with RF operation in mind, it is totally noise
free and utterly stable. Lighter than an IC-706 and bout the same
size, it will fit underneath for desktop operation. It will also fit
in a brief case or flight bag.

There is a rack mount version that is internally selectable 120/220 Here's
a thread on the conversion:

http://n2.nabble.com/Samlex-SEC-1223-td382856.html- Hide quoted text -

- Show quoted text -

Hi

Thanks for the advice. I would probably need to find a service
engineer to do this as meddling with the inner of switch mode power
supplies is beyond my comfort zone. I just wondered why it seemed to
work and if i could get away without further mods or if there was a
simple switch to flick like there was on my home pc power supply (if
only!).

Thanks for the link to advice.

Andy


Full schematic he
http://www.n0ss.net/index_general.html

If you had a 120/240 switch, that is where it would go. It cuts off half of
the full wave bridge to feed same voltage that would be available with 240
v.
Doing so will likely allow you to pull full current before regulation goes
south. Might be iffy for your radio if you don't. Also the supply will run
cooler if you do.

There is also an output voltage adjustment.

It has been stated elsewhere in documentation not to hook a battery on the
output for backup.

No Spam wrote:
On Sun, 31 Aug 2008 06:25:43 -0700, Andiroo wrote:

Hi All

I recently moved to the US and have brought with me a SEC 1223 Switch
Mode Power Supply (spec is below). It is not marked up that it can run
using 120V but i tried it and it seems to be putting out about 13.2V on
my meter. I have not stress tested it with a radio connected on
transmit.

Any thoughts?


Regards

Andy

SEC-1223 SEC 23A 13.8V Switch Mode Power Supply * Input 230V AC * Output
13.8V DC * Output current 23A continuous (25A peak) * Thermostatic Fan
cooled * HF & VHF filtering *

The SEC-1223 switch mode power supply offers 23A of continuous current
output and 25A peak. This is more than enough for any 100W transceiver.
Designed with RF operation in mind, it is totally noise free and utterly
stable. Lighter than an IC-706 and bout the same size, it will fit
underneath for desktop operation. It will also fit in a brief case or
flight bag.


Some of these newer supplies can auto switch between input voltage. The
nomenclature on the spec tage will say something like....

" 90~250v "

If it says that, it's a auto switching input

Most of the 90-250V are "universal", not auto switching, as there is no
switching of the primary involved for any reasonable input voltage.
They rectify the incoming voltage, and the actual switcher that creates
the output voltage runs on that DC supply. This is the reason many
single rated (240V) switchers will run on 120V, though they don't
typically provide full current output unless they have really stout
input diodes... If you've a 250V single input rated switcher, (and no
obvious jumpers inside) it would be best to keep the output drain to
half of the rated current, unless you've been inside and can verify the
input diodes can handle the current.. (DAMHIKT) [wry smile]. Any
supply with jumpering inside to switch can typically use 120V with full
output.
Good Luck
--Rick AH7H

On Aug 31, 9:35*pm, "JB" wrote:
It has been stated elsewhere in documentation not to hook a battery on the
output for backup.- Hide quoted text -

Anyone know why that comment "not to hook up a battery"?
Perhaps because to re-charge a nominal 12 volt battery at say 2.3
volts (max) per cell it requires 6 x 2.3 = 13.8 volts. Or even a
little higher; that's why military equipment was/is rated as '14
volts' (or, typically aircraft, 28 volts).

It has been stated elsewhere in documentation not to hook a battery on the
output for backup.- Hide quoted text -


It is potentially hazardous to float a battery on just any power supply
output. Several issues can and DO arise with ALL power supplies.

1. May interfere with regulation.
2. May exceed the design limits for overvoltage protection circuits.
3. May exceed the design limits for overcurrent protection circuits.
4. May cause damage to the power supply or excessive current drain on the
battery system when the power supply is not energized.
5. Voltage may not be set for proper charge/float operation resulting in
premature failure of battery.
6. Other issues may arise from the modular nature of a complex system
that can be too easily changed or modified without proper consideration,
I.E. simply by hooking up another piece of gear, adding a wire or even
adding
a fuse holder that isn't designed to be used in an explosive and corrosive
environment.
7. Battery float issues not considered or investigated in design, prototype,
product development and marketing phases.
Or fully considered in corporate risk management and policy development,
I.E. it is much safer and simpler to just say no rather than have to deal
with explaining how to do it.

In order to float a battery on a supply, you need to either buy a supply
designed for it or you need to redesign what you use.

There are also other serious potential hazards when dealing with batteries
that need to be addressed.

1. Fire hazard
2. Hazardous Gas and Vapor handling, including burning insulation.
3. Acid containment issues
4. Explosion hazard
5. Mandatory skillful regular maintenance in order to minimize and avert
disaster as well as maximize life expectancy.

As I stated, mine has been modified (redesigned) for battery float
operation. To do this, you need years of training, experience and the
ability to project that knowledge into successful practice. If you have an
ongoing professional need for this please get in touch with me at:
http://infotech.awardspace.com/

Otherwise, DO NOT PROCEED! Because of various risks to Life,
Health and property of yourself AND OTHERS!

JB wrote:
It has been stated elsewhere in documentation not to hook a battery on the
output for backup.- Hide quoted text -


It is potentially hazardous to float a battery on just any power supply
output. Several issues can and DO arise with ALL power supplies.

1. May interfere with regulation.
2. May exceed the design limits for overvoltage protection circuits.
3. May exceed the design limits for overcurrent protection circuits.
4. May cause damage to the power supply or excessive current drain on the
battery system when the power supply is not energized.
5. Voltage may not be set for proper charge/float operation resulting in
premature failure of battery.
6. Other issues may arise from the modular nature of a complex system
that can be too easily changed or modified without proper consideration,
I.E. simply by hooking up another piece of gear, adding a wire or even
adding
a fuse holder that isn't designed to be used in an explosive and corrosive
environment.
7. Battery float issues not considered or investigated in design, prototype,
product development and marketing phases.
Or fully considered in corporate risk management and policy development,
I.E. it is much safer and simpler to just say no rather than have to deal
with explaining how to do it.

In order to float a battery on a supply, you need to either buy a supply
designed for it or you need to redesign what you use.

There are also other serious potential hazards when dealing with batteries
that need to be addressed.

1. Fire hazard
2. Hazardous Gas and Vapor handling, including burning insulation.
3. Acid containment issues
4. Explosion hazard
5. Mandatory skillful regular maintenance in order to minimize and avert
disaster as well as maximize life expectancy.

As I stated, mine has been modified (redesigned) for battery float
operation. To do this, you need years of training, experience and the
ability to project that knowledge into successful practice. If you have an
ongoing professional need for this please get in touch with me at:
http://infotech.awardspace.com/

Otherwise, DO NOT PROCEED! Because of various risks to Life,
Health and property of yourself AND OTHERS!

Aren't there IC chips that safely manage battery configurations such as
these?

"Dave" wrote in message
...
JB wrote:
It has been stated elsewhere in documentation not to hook a battery on
the
output for backup.- Hide quoted text -


It is potentially hazardous to float a battery on just any power supply
output. Several issues can and DO arise with ALL power supplies.

1. May interfere with regulation.
2. May exceed the design limits for overvoltage protection circuits.
3. May exceed the design limits for overcurrent protection circuits.
4. May cause damage to the power supply or excessive current drain on
the
battery system when the power supply is not energized.
5. Voltage may not be set for proper charge/float operation resulting in
premature failure of battery.
6. Other issues may arise from the modular nature of a complex system
that can be too easily changed or modified without proper consideration,
I.E. simply by hooking up another piece of gear, adding a wire or even
adding
a fuse holder that isn't designed to be used in an explosive and
corrosive
environment.
7. Battery float issues not considered or investigated in design,
prototype,
product development and marketing phases.
Or fully considered in corporate risk management and policy development,
I.E. it is much safer and simpler to just say no rather than have to
deal
with explaining how to do it.

In order to float a battery on a supply, you need to either buy a supply
designed for it or you need to redesign what you use.

There are also other serious potential hazards when dealing with
batteries
that need to be addressed.

1. Fire hazard
2. Hazardous Gas and Vapor handling, including burning insulation.
3. Acid containment issues
4. Explosion hazard
5. Mandatory skillful regular maintenance in order to minimize and avert
disaster as well as maximize life expectancy.

As I stated, mine has been modified (redesigned) for battery float
operation. To do this, you need years of training, experience and the
ability to project that knowledge into successful practice. If you have
an
ongoing professional need for this please get in touch with me at:
http://infotech.awardspace.com/

Otherwise, DO NOT PROCEED! Because of various risks to Life,
Health and property of yourself AND OTHERS!

Aren't there IC chips that safely manage battery configurations such as
these?

Are airplanes safe? Yes but it depends on how you build them, maintain
them, fuel them, take-off and Land them. Who flys them and how... I know
this much about airplanes but I'm not a pilot.