eHam

eHam Forums => Elmers => Topic started by: N3QOU on December 29, 2012, 04:13:20 PM



Title: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: N3QOU on December 29, 2012, 04:13:20 PM
I am in the process of looking for a power supply..And I find a ton of choices I need some guidance
on what stay away from,and what do I really need??
Only for one HF rig?? Any ideas.. Can I power it on the cheap..
Thank you !!


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: AA4PB on December 29, 2012, 04:18:41 PM
Astron is a pretty reliable choice. Make sure you pick one with a current rating that can handle the requirements of your radio.

There are some cheap supplies out there that don't have any over-voltage protection. If one of those fails it can take out your HF rig with it. Stay away from anything that doesn't have over-voltage protection.



Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: WN2C on December 29, 2012, 04:20:41 PM
What are you powering? a 100 watt radio or a Qrp radio? Depends on how many amps you need.  Need more info

Rick  wn2c


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: N3QOU on December 29, 2012, 06:50:54 PM
Sorry it would help to know what it's going to be working with.
100 watt rig, Kenwood.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: ONAIR on December 29, 2012, 07:13:57 PM
I've had great luck with the small Jetstream JTPS 31MB switching power supply.  Relatively inexpensive ($79) and quite small, and works well with a 100 Watt HF or 2m 440 rig with no noise issues.  Check out the eham reviews.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: AA4HA on December 29, 2012, 07:19:36 PM
Hmm, there "is" a trick but you would need to be really operating on a shoe-string budget to consider this.

Use a smaller supply and use it to float charge a battery. Run the radio off of the battery/supply combination. You can size the supply to be large enough to handle the receiver current plus whatever you drain off in transmitter duty cycle and the minor losses of float charging the battery.

I used that trick to run a 100 watt HF rig off of a 12 volt, 5 A/Hr supply for a few months.

You do need to be careful about the voltage applied to the battery so you do not cook it from overcharging and you will want to install some sort of diode to prevent the battery from backfeeding into the supply. You will need two fuses, one to protect the supply (at slightly less than the max current rating of the supply) and another to protect your radio (usually the fuse rating specified for the rig).

To get the voltage drop from the charger to the battery you can use diodes. Remembering that a standard rectifier diode will drop 0.7VDC (watch your current rating with the diode(s) too). If you need more drop use multiple diodes in series, if it is really marginal then consider a Schottky diode (less voltage drop, read the spec sheet on the particular diode you use).

If you size the battery too small you will find yourself running the thing dead if your operating demands are higher (the unexpected urge to rag chew or do digital modes). That can in turn pop the power supply fuse (maybe a circuit breaker would be a better idea unless you own stock in a fuse company, hmmm). I was using a surplus PowerSonic 12 volt battery that could deliver 50A/Hr.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: AD6KA on December 29, 2012, 08:48:51 PM
For a "budget" PS for a 100w HF rig, I highly
recommend the SAMLEX 1223.
It's manual says it is rated for 23A @ 13.8vdc
continuous and 25A peak.

Though not currently my main 13.8vdc suppy,
I have used mine for over 12 years with no
problems, either at 120 or 220vac input.

GL ES 73, Ken AD6KA


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: LA9XNA on December 30, 2012, 04:14:58 AM
I recomend to get a linear powersupply with the capacaty of at least 25A.
If you use a linear power supply there will be no problems with the kind of noise you can get of switching power supplies.
All switching power supplies will make some noise, also the good ones like SAMLEX.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: KK4CPH on December 30, 2012, 05:26:56 AM
I also have a Kenwood and use this:  http://www.radio-mart.net/QJE-PS-30SW1-Power-Supply.html
It's $74.99.  20amp continuous, 30amp surge.  Can barely hear the fan.  Has a Noise Off-Set Control but I haven't had to use it.
It's a nice unit IMHO.

Eric



Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: K0CBA on December 30, 2012, 09:27:38 AM
Don't scrimp pennies on your power supply!

Get a quality one because one power supply hiccup can cause a lot of grief with every thing in your station that's hooked to it and that will cost a heck of a lot more than you could ever save by getting a cheapie!


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: K2OWK on December 30, 2012, 02:56:34 PM
I might get blasted for this one, but I have been using a Mega-Watt 30 amp continuous switching supply for over a year now with no problems. I use it on my Yaesu FT-450AT. It produced no switching noise or hash. The voltage out varies less the a millivolt from no load to full load. This is a no frills power supply, I paid $50.00 or so from a fellow on EBay. I think he still sells them. Check the E-Ham reviews on this unit.

I also just purchased a generic supply for $28.00 from Amazon. It looks exactly like the Mega-Watt, but has no name on it. I am in the process of testing it fully and doing a burn-in before using it on my Yaesu FT-4700RH if it passes. So far it is behaving exactly like the Mega-Watt. It is also a 30 amp continuous supply.

Whatever supply you buy even an expensive one I would still throughly test it before connecting it to my equipment. I would test it for voltage and current regulation and over voltage protection under full load and no load. I also would check it for AC ripple voltage under the full and no load operation.

The Amazon supply comes with no directions or power cords. The Mega-Watt With an instruction sheet and a power cord with a switch for testing. The hook up is obvious as the terminals are well marked.

I do not know what these supplies were built for but they look like a supply used in some industrial equipment. The mounting holes are threaded for mounting in some type of chassis.

This is just for information for those that want an inexpensive power supply, but testing operation and burn-in is highly recommended before use

73s

K2OWK

 


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: AC2EU on December 30, 2012, 03:56:05 PM
I bought a Kenwood KPS-15 SMPS (23 amps) . No hash, It's been in service over two years with no problems.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: AA4PB on December 30, 2012, 04:22:00 PM
Whatever supply you buy even an expensive one I would still throughly test it before connecting it to my equipment. I would test it for voltage and current regulation and over voltage protection under full load and no load. I also would check it for AC ripple voltage under the full and no load operation.

The average new ham has neither the test equipment nor the experience to run power supply tests like that. That's why I recommend a known brand like Astron rather than going "cheap" on a power supply that you are going to connect to your expensive radio.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: K2OWK on December 30, 2012, 08:55:45 PM
All the power supply tests I recommend can be done with a multimeter and a few automotive headlamps for a load.

73s

K2OWK


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: VA7CPC on December 31, 2012, 09:46:46 AM
I'll second the suggestion of the Samlex 1223.  Mine has worked fine, no hash, on several rigs over 10 years.

.         Charles


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: W5TTW on January 11, 2013, 08:14:33 AM
I have run the SAMLEX 1223 (branded as the YAESU FP-1023) for a few years without a problem.  Its plain Jane, but it works.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: N6AJR on January 12, 2013, 02:26:48 PM
If you can afford it, get a 30 or 35 amp supply . Sooner or later you will want a second radio, and a couple of mobile rigs in the shack for 220 or 900 mhz and so on. if you can pick up a good used 50 amp suppley  it will handle your radio and even a small amplifier for 2m or such.  but at least get something at 25 amps or better, as a 100 watt radio will draw 22-23 amps on tx.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: W9GB on January 12, 2013, 03:05:29 PM
Quote
I might get blasted for this one, but I have been using a Mega-Watt 30 amp continuous switching supply for over a year now with no problems.
Mega-Watt power supplies are sold in the USA by:
http://www.12voltpowersupplies.us/

John Marles
31700 Tick Canyon Road
Agua Dulce CA 91390

==
VISUALS:  Appears to be an Asian (mainland China) copy of the
Mean-Well SE series Switch-Mode Power Supplies (SMPS).

http://www.meanwell.com/search/se-350/default.htm

Mean-Well, based in Taiwan, is a 30-year mfg. of power supplies (largely SMPS).
http://www.meanwell.com/

Assessment with an oscilloscope that can SHOW AC ripple on DC output is a USEFUL Test (results), as well as regulation measurements (voltage sag) under rated loads (Amps).


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: N3DT on January 13, 2013, 07:07:27 AM
I was going to suggest a battery with a 13v small power supply to charge it, but $50 for a 30A supply is a real good deal.  You'd have to be buying batteries once in a while too, but it does mean you can work when the power is off.

Shipping is reasonable too.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: NR4C on January 15, 2013, 08:01:21 AM
Buy nice, not twice!

get a good brand, and don't skimp on size.

Switchers are lighter if you need portability but can cause noise on some bands.

Linears are heavy, not very portble, but RF Quiet.

What do you need it for?

Where are you going to use it?

How many Amps do you need?

Check with club members, often someone has an old linear around gatering dust, may be just what you need.

...bill  nr4c


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: K8AXW on January 15, 2013, 08:16:38 AM
The question reminded me of the TV commercial where the guy was driving down the road with a cloud of black smoke coming out the tail pipe.  When a passenger asked him what kind of oil he was using, the replied, "Oil? No idea.  Oil is oil!"

Going "cheap" on a power supply for an expensive transceiver is exactly the same and quite possibly with the same result..... a lot of back smoke being released. 


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: KG6YV on January 15, 2013, 11:11:46 AM
I also like the Samlex (23 amp).  Fan isn't noisy and although it is a switching supply it causes no RFI/noise here in my shack.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: VA3WXM on January 16, 2013, 07:54:49 AM
I've got an Alinco DM-330MV that's been running more-or-less continuously since when I bought it new in 2005.  It powers my Kenwood TS-2000, Yaesu FT-8900, police scanner and XM satellite radio.  Solid DC output, small form, lightweight, RF quiet.  It just keeps going and going!


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: N6SBN on January 16, 2013, 10:09:31 PM
  I like the Alinco DM335.  It has the meter, jacks front and rear and a place for a cigarette lighter.  This makes this unit quite versatile.    The Samlex is probably cheaper.


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: K0BT on January 17, 2013, 06:21:12 PM
I like the Astron 35 amp supplies. They are reliable, quiet, have crowbar protection to save expensive radios, and are easy to repair in the rare instance something does go wrong. They are not as efficient as a switcher but they sure do last.   


Title: RE: Power supplies?? Looking for a budget minded choice. Any Ideas??
Post by: N5KNG on January 20, 2013, 11:26:41 AM
Another fan of the Samlex SEC 1223 here.  I have used these on multiple 100W rigs of various brands with nary a problem.  Inexpensive and light weight, with no noticable noise, audible or electrical.  They have current limiting, short circuit protection and over-voltage protection.  Be sure to get something that has at least 23A capability, since some 100W rigs go right up to 22A or so (and a 20A supply won't cut it).  They are great!