Question about Yaesu FT-990 DC Transceiver

1 Answer

Need to know the capacity needed for power supply

How much current must the power supply be capable of supplying?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Yaesu Master
  • 3,957 Answers

Manual specifications: 60 VA for receive, and 470 VA for transmit @ 100 W. Radio will take 100-117 or 200-234 VAC +/- 10% 50/60 Hz.

Posted on Apr 02, 2015


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Would a 19v 3.16a power supply suits a lcd monitor 19v 2.6?

Yep, that should do very well. The voltage (19V) is critical - that should match exactly. The current (3.16A, 2.6A) isn't so critical, but the power supply MUST supply AT LEAST as much current as the monitor requires. The extra current capacity won't hurt anything at all, it just won't get used for anything.

Aug 01, 2014 | Acer AL1916W 19" LCD Monitor

1 Answer

Ac to dc power supply failure

The current capacity of the power supply may be insufficient for the camera. Use an ammeter to check the actual current draw of the camera.. Check the voltage of the power supply with a voltmeter at the camera while in operation. If the voltage is several volts less that it's rated output, then the supply needs to be able to replaced with one with a larger current capacity.

Jan 23, 2014 | Night Owl Optics Home Security

1 Answer

What adapter do i need to connect a uniden bearcat pc78 elite inside my home

Hi Ray,

This is a mobile CB radio. According to the manual, it requires 13.8VDC @ 2.2Amps. You will need to provide an AC (house or alternating current) to DC (direct current) power supply capable of providing 13.8V at 2.2 Amps. This means the supply would be working at 100%, so obtaining a supply that would provide 4, 5 or more amps would be much less stressful on it and significantly reduces the chances of a 60 cycle hum present in the receive and transmit audio.

A representation of 13.8VDC @ 4A power supplies can be found here for $40 and up. Of course, you can go to a local electronics store and find them too. Check eBay for these, too - here.

You should be looking for a power supply that will provide 12 - 13.8 volts DC, and provide 3, 4 or more amps. The amp capacity is what will change the price - the more amps the higher the cost. You may see small "switching" power supplies - they are smaller, lighter & cheaper than traditional linear or transformer based types - so if that is the type you want to get you might want to get one that is a little bigger (5 or 6 amps) than the transformer type to get the same performance.

I hope this helps & good luck!

May 06, 2012 | Uniden Bearcat PC78 Elite 40-Channel CB...

2 Answers


Since you have to purchase a new video card then I would go ahead and get one and see what happens. Worst case, you'll have to go buy a bigger power supply.

Oct 08, 2010 | Computers & Internet

2 Answers

What is the correct amps for the 12 volt transformer

the current measured in ampere which depends upon the resistance . V/R=I{ohm's law} . as resistance is low , current becomes high . power supply gives that much current which circuit takes no fixed current transformer gives whatever current mentioned on the transformer .i.e., maximum current capacity of that transformer .

Apr 20, 2010 | Computers & Internet

1 Answer

I bought an xps 210 2 years ago. The power supply is dead

It is possible that you picked up a faulty power supply, slim, but possible. Chances are pretty good that you have one of your components drawing too much current on your power supply. The largest power drain comes from your processor and the graphics accelerator cards, however it could be a faulted motherboard or hard drive. You can replace your power supply with a larger capacity unit from a known good manufacturer. If you increase the wattage capability and look with the side off to see if any component is generating a lot more heat than usual. A larger capacity power supply should be able to handle the unusual current draw.

Apr 18, 2010 | Dell XPS 210 PC Desktop

1 Answer

My problems power supply

eBay will have dozens of ATX supplies and I would recommend upgrading the supply power capability if it really is that low. The additional power won't cost much more and it will run at less than full capacity all the time. BTW, supplies are the sloppiest built part of any system and one of the most common places systems manufacturers like to save a buck and that is about what it amounts to.

Feb 18, 2010 | Dell OptiPlex GX110 PC Desktop

1 Answer

Power supply not working

Hello my friend, if one of your power supply's part is burned, your power supply won't work else if its work i has a short time to operate and it will be burned the whole board of your supply. Mainly the reason of burning your supply are the following: 1. The Electric supply  from the source is to high or above the limitation of your Power supply. 2. Your power supply is over capacity. 3. You're power supply board develop a liquid moisture inside that is why it shorted and eventually the board is burned.  4. The load of your power supply is overload due to some device you attach that is beyond to the limit of your power supply's wattage capacity.
Note: try to see the wattage or voltage or the capacity of your power supply can supply the electricity within your computer system. To ensure that it does not exceed the limit of your power supply's limitation.  I therefore reccomend that to avoid burning the entire power supply board from short circuit, it is recommended to replace your power supply to avoid incidents may arise.
Hope this advice helps your problem. If you need more assistance just reply to this post.  If this solution or recommendation is able to solve or help your problem then please rate it.  Thanks

Jun 25, 2009 | Office Equipment & Supplies

1 Answer

Power dims when keyed dims lights fans ect.

your radio is trying to draw more current than your power supply can provide it, you need a power supply with higher current capability.

Nov 18, 2008 | Ranger RCI-2995DX Base Scanner

1 Answer

What is the voltage, current, and polarity of the power supply for the SC-D23?

You should use the original Samsung supply since it is a switching power supply capable of supplying the needed current to operate the onboard charging circuit. Many customers have tried to go with generic supplies and it opens the inline chemical fuse due to the unit drawing heavy current during battery charging. Hope this helps. Joe Weibel Custom Electronics Memphis, TN 38133 (

Feb 12, 2007 | Samsung SC-D23 Mini DV Digital Camcorder

Not finding what you are looking for?
Yaesu FT-990 DC Transceiver Logo

Related Topics:

128 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yaesu Radio Communications Experts


Level 3 Expert

3289 Answers


Level 3 Expert

1654 Answers


Level 2 Expert

102 Answers

Are you a Yaesu Radio Communication Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides