uninterruptable power supply

  • 1
  • Question
  • Updated 2 years ago
  • Answered
Can someone suggest a decent UPS that is low on RF and audible noise?

I run my 6500 from a marine battery, Alinco power supply and PG40S PowerGate. It works great and seems very quiet.

As it stands, if the power goes out (not uncommon) I'm without my main computer. I should be setting up my laptop to work with the rig as a backup, and I will, but I would like to get some time out of the PC (Dell 6900 with multiple monitors) to at least finish off a QSO and do a clean save and shutdown before the UPS runs out of energy.

Any suggestions on a make/model or clues on what I need to look for? One of my friends has a small APC but he says his S-meter jumps from S1 to S9+ when he runs it. Not good.

73,
Kev K4VD
Photo of Kevin K4VD, Elroy

Kevin K4VD, Elroy

  • 775 Posts
  • 171 Reply Likes

Posted 2 years ago

  • 1
Photo of Norm - W7CK

Norm - W7CK

  • 746 Posts
  • 151 Reply Likes
I also run my station off of 12v DC batteries. Four golf cart batteries in my case.

I'd also be interested in a quiet UPS to power the computer, monitors and network gear.   I was actually thinking of running them off of a 12v DC to 120v AC Inverter but I can't seem to find a RFI QUIET one of those either.  I've tried several Inverters and all of them have been noisy.
Photo of Craig - KØCF

Craig - KØCF

  • 133 Posts
  • 44 Reply Likes

Hi Kevin,

I am using an APC Back-UPS Pro 1000. It produces no noise that I can detect, and gives me decent run time with 2 monitors (30" & 24").

73,
Craig, KØCF


Photo of Rick - W5FCX

Rick - W5FCX

  • 202 Posts
  • 50 Reply Likes
Photo of Kevin K4VD, Elroy

Kevin K4VD, Elroy

  • 775 Posts
  • 171 Reply Likes
Rick... I found the 1000 on Amazon after Craig suggested it and see the 1500 there. I also see the 1500 can be expanded with an external battery pack. Something worth considering.

So you guarantee that this will cause no noise at all in my radio?

(I'm kidding!!!!)

I asked my buddy some more details about his UPS. It is an APC-6000 he thinks. It's a rack mount and he bought it from Craig's List. I think it might have been something used inside a computer rack where RFI and AFI wouldn't be so much of a problem.

The Back-UPS is looking like it's worth trying.

Kev
Photo of David Livingston

David Livingston

  • 121 Posts
  • 27 Reply Likes
I use Tripp-lite 1500's (three of them) with pure sinewave output and rated for no RFI.  Very quite. I also use high end linear power supplies.  I do not like most switching PS. I also have extended batteries on all three.

David
(Edited)
Photo of Ned K1NJ

Ned K1NJ

  • 301 Posts
  • 75 Reply Likes
     Using the APC pro 1500 here.  Had many kinds before including auto
 and marine batteries.  There are some small things that are neat with these
units.  You can disable the alarm.  Some others you can't.  The batteries
in these are easy to install and replace.  Some others require surgery and
some can't be replaced at all.
  Count on 5-10 minutes of run-time for your station If the numbers say 15 minutes
with any of these units.  The 1500 is rf silent and it's usually inaudible until it
comes on to actually supply power, then you can hear a fan power up.
This should not be a problem, you will be off the air soon.
   If you need serious power, consider a generator and use a UPS to hold power
on for the few seconds it takes for the generator to kick in.

Good Luck,

Ned,  K1NJ

 


 
Photo of Larry Benoit

Larry Benoit

  • 63 Posts
  • 15 Reply Likes
Kev,

I tried an APC BackUPS with a Dell 9000 but it was unusable because the sawtooth AC power envelope sent the computer into a ceaseless cycle of starting and stopping. I bought an APC SmartUPS 1000 and it has worked flawlessly with the Dell 9000 and other computers (Dell 8700) for the past four years.

The difference between these models is significant as is the price. The SmartUPS output is a clean AC sine wave with power factor correction, which assures it will work with all types of power supplies and highly sensitive equipment.

You may be perfectly fine with Back-UPS, but you might want to do a little research to see if the BackUPS model is confirmed to be compatible with your Dell 6900.

Good luck and 73,
Larry KB1VFU
Photo of Kevin K4VD, Elroy

Kevin K4VD, Elroy

  • 775 Posts
  • 171 Reply Likes
Thanks Larry. Something I hadn't considered. I also need to check into the Tripp-Lite that David mentions. I'll do some comparisons.

Kev
Photo of Dan -- KC4GO

Dan -- KC4GO

  • 339 Posts
  • 68 Reply Likes
I have 3 APC Back-UPS Pro 1500's (1 for desktop, 1 for radio gear and one for small server/16 Tb raid storage and network gear)  in the sack and 2 more in other locations in the house. I have been very pleased with performance and Lack of RF noise.
Photo of Rick - W5FCX

Rick - W5FCX

  • 202 Posts
  • 50 Reply Likes
Likewise. All my Flex radios and related PCs, routers and rotator controller run on the APC 1500 - no RFI issues here.
Photo of Norm - W7CK

Norm - W7CK

  • 746 Posts
  • 151 Reply Likes
Is anyone using a 12v DC to 120v AC Inverter that they could recommend that is fairly RFI free?

Since I already run most of my station off of 12v DC battery system, I'd really like to find an inverter that I could use to run the few items that require 120v AC.  Might be a cleaner and longer lasting solution to using a UPS.
Photo of Norm - W7CK

Norm - W7CK

  • 746 Posts
  • 151 Reply Likes
I believe the APC1500 has TWO 24v battery banks inside.  Does anyone know if the UPS operating voltage is 24v or are both batteries run in series to produce a battery bank voltage of 48v?
Photo of Kevin K4VD, Elroy

Kevin K4VD, Elroy

  • 775 Posts
  • 171 Reply Likes
From what I've read, 24V. On some of these UPSs you can buy external battery modules. The ones I looked at always read 24V.

BR24BPG http://www.apc.com/shop/us/en/products/APC-Back-UPS-Pro-External-Battery-Pack-for-1500VA-Back-UPS-Pr...
Photo of AA0KM

AA0KM

  • 327 Posts
  • 56 Reply Likes

This would be a nice UPS some day with some solar panels to go with it.

Awe but just a dream. :)

https://www.tesla.com/powerwall


Photo of John - WA7UAR

John - WA7UAR

  • 102 Posts
  • 25 Reply Likes
Here is a link to my question on the Tesla Forums page:
https://forums.tesla.com/forum/forums/using-powerwall-amateur-ham-radio-station
Photo of Peter K1PGV

Peter K1PGV, Elmer

  • 541 Posts
  • 315 Reply Likes
The problem with Powerwall is actually trying to BUY one. I have a friend who wanted two for her house, and no way no how could they find anyone who would actually take their money and send them a Powerwall. Smoke and Mirrors apparently.
Photo of Kevin K4VD, Elroy

Kevin K4VD, Elroy

  • 775 Posts
  • 171 Reply Likes
I think I settled on the APC SmartUPS 1500. This seems to be made more for a server environment but it creates a pure sine wave unlike the BackUPS (sawtooth?) or the Tripp-Lite (PWM). The only device that mentioned EMI/RFI was the Tripp-Lite.

I was going to buy from Amazon but they won't accept returns on UPS devices. Best Buy, for a few bucks more, has the SmartUPS in stock and I think they have an OK return policy. I'll be giving that a try and hopefully be able to return it of the noise is objectionable.

Thanks for all the help! If I come across anything negative I'll post back the results.

Kev, K4VD
Photo of Ned K1NJ

Ned K1NJ

  • 301 Posts
  • 75 Reply Likes
      APC Back UPS Pro 1500 produces  a "step approximated sine wave".

Ned
Photo of Ria - N2RJ

Ria - N2RJ, Elmer

  • 2254 Posts
  • 879 Reply Likes
That's called a "modified sine wave" but all it does is narrow the positive and negative cycles so that it almost looks like a sine wave. For most electronics it's good enough.
Photo of Michael Aust

Michael Aust

  • 135 Posts
  • 32 Reply Likes
Kevin,

  Got two of these in my Ham Shack, nice and quiet ! 
highly recommend these APC Smart 1500 UPS units. 

The APC powers an ALINCO DM-330MV Switching 
Supply and is very quiet, power my Flex6700, no HF
carriers, no RFI, clean, etc 

Works great.

73 Mike

P.S. : Found my APC Smart UPS 1500's Surplus, got new batteries for them off Ebay cheap, works great !!
Photo of David Livingston

David Livingston

  • 121 Posts
  • 27 Reply Likes
This one has it all ... Including Pure Sine Wave...

SM1500RMXL2UTAA TAA SmartPro 120V 1.5kVA 1.35kW Line-Interactive Sine Wave UPS, 2U, Extended Run, Network Card Options, LCD, USB, DB9


Output AC Waveform (AC Mode)Sine waveOutput
AC Waveform (Battery Mode)Pure Sine wave.

SURGE / NOISE SUPPRESSIONUPS AC Suppression Joule Rating570
UPS AC Suppression Response Time Instantaneous
EMI / RFI AC Noise Suppression Yes
(Edited)