Question about Radio Communications

2 Answers

How much current must the external power supply be able to provide?

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 3,957 Answers

To run an HF transceiver (100 W), the radios normally want to see up to 20 - 35 watts of power available at 12 volts. You earlier referenced the FT-990 HF transmitter, which takes a normal AC voltage input from a line cord. Normally a 20 amp circuit would suffice. Since you did not specify if the radio has the internal heavy duty internal AC switching power supply. For an 110 V connection, the unit requires an 8 amp fuse, and 4 amp for 220. I have included a link where you can download the manual for reference: http://www.download.n7tgb.net/yaesu/FT990/FT-990_Manual.pdf

Posted on Apr 02, 2015

  • Level 1:

    An expert who has achieved level 1.

    Governor:

    An expert whose answer got voted for 20 times.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 10 Answers

According to the manual, IF you have the DC power option installed you need to connect to a source capable of 20A at 13.8VDC. If you're going to run it off an inverter in a vehicle (not recommended - you'll have all kinds of noise), you'll need an inverter capable of probably at least 300W (maybe more for the radio to be stable).

Posted on Apr 07, 2015

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
a 6ya expert 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 repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

Hi I have a car amp in my room which is hooked up


Car amplifiers cannot be powered by laptop power supply. These amplifiers have different power ratings. You need to check the Car amplifiers power requirements / rating (Voltage & Current requirements) and then get a power supply with the exact same Power ratings. If the power supplied to the amplifier is less than the rated power it needs, it will not be able to drive the amplifier IC's and transistors in the amplifier and will not produce good sound.
Please check the power requirements for the amplifier and buy a suitable external power supply for it.

Sep 01, 2014 | Computers & Internet

1 Answer

My computer will not provide access to the toshiba external hard drive


1)Check that the drive is receiving enough power to spin up. The USB port might not provide enough power, in which case a powered hub or other external power supply might be the solution.

2)Check the cable. A bad connection anywhere in the chain can block current flow, both for power and for data transfer.

3)If you can open the enclosure without damaging it, check that all internal connections are good.

Jun 19, 2014 | Toshiba Computers & Internet

1 Answer

Power supply humming


I think you have a 110 volt machine on which you are using a step down transformer. If so it seems that the voltage from the transformer is high or the current factor requirement is also insufficient . which can produce the hum or heat. Make sure the voltage is steady or else you will need to use a stabilizer or a proper power supply that is actually catering to the requirement of the machine. You have not mentioned the power factor of the machine and i suspect that the power supply used externally is insufficient.

Sep 27, 2013 | Siemens Washing Machines

1 Answer

What external power does SmartDisk FireLite FWFL120-N take?


Many USB power supplies will have the right plug. I picked one up by buying a cheap USB hub, What you want to look for (most likely on the bottom of the power supply) is VOLTAGE Output: 5.0 VDC, POWER Output: 1.0 amp or (1000ma) and the center hole is the positive side. I have even seen some BluTooth earpiece charges that supply what you need.

Hope that this will help.
AAirwolf

Jul 05, 2010 | SmartDisk FireLite FWFL120 120 GB FireWire...

1 Answer

Please i need the power adapter rating for seagate


Have you got the original power adapter?
If so the voltage details are printed on the label on the bottom of the adapter.
If the external USB Seagate hard drive houses a 31/2" drive then it requires an power adapter that provides +12 volts and +5 volts both supplying approx 2000mA of current.
If the Seagate uses a 21/2" (laptop) hard drive then it only requires +5 volts power adapter.
The only problem is the power connector to the external drive, make sure it suits the external hard drive unit and the power pins are correctly wired for the Seagate. If the polarity of the plug is incorrect lt wired (ie reverse polarity) then it could damage the USB hard drive and adapter case.

Nov 20, 2009 | Seagate (ST3500601CB-RK) (ST3400601CBRK)...

1 Answer

Computer resets with Power cuts not always although UPS supplied


ups may not be true on line, type so sometimes when power outage happens there can be a very small break in supply. this can cause load items to shut down
get good quality on line ups.

Jun 02, 2009 | Computers & Internet

1 Answer

Power supply for 3Com U.S. Robotics fax modem.


You need 9V/1A supply (with +9V at center pin) for your model with beige case. Do not use 22V/1.5A supply for old 33.6k model with
gray case. The shapes of the cases are very similar (56k has fever
leds, no external volume control, and no connectors for external
telephone equipment and external speaker), but the power supply
voltages and currents are completely different.
I hope this will help.

Jan 14, 2009 | 3Com U.S. Robotics Faxmodem 56K

1 Answer

Power supply


Get a new external carrier, new external drive, or find a power supply that puts out the same voltage and at least the same current. If you cannot find a power supply with the same connector you can cut the cables on the new power supply and the old one and splice the connector from the old power supply on.

BTW please try to put some more specific information when asking about a problem. The more info the easier it is to solve.

Nov 04, 2007 | Western Digital My Book Essential Edition...

1 Answer

Monitor won't power on


PF747 has internal switch-mode power supply. Old LCD monitors have external low voltage (12VDC) power supply which can easily be replaced by any brand provided the voltage and current is the same. On your monitor, th epower supply module is built inside the unit. When you say that the LED is flashing, this means two things, 1. The power supply is attempting to start, but the load (or current) is above its limit and it automatically switch off, then tries to start again and so on. This can be a problem with the load (minitor intelligence or the mainboard, hv supply for the flourecent back supply) 2. It can be that the power supply module is defective In any any case, the only way to find out is to disconnect the load from the internal power supply (the monitor have to be opened), and measure the voltage at the terminal. In many devices the output will be 12 volts and in some cases there will be also 5volds supply. If there are correct voltage present, then the supply is OK and most probably the mainboard or the HV supply is defective. If there are no voltage present, then the power supply module is defective. You can either fix this module, replace with exact new module or if you have a spare external powersupply, you can use this to provide the power to the internal circuit. The last option is recommended only if you have experience in electronics repair. If you cannot do the repair yourself and will cost USD200, buy a new monitor.

May 18, 2007 | BenQ FP747 (Beige) 17" LCD Monitor

Not finding what you are looking for?
Radio Communications Logo

Related Topics:

163 people viewed this question

Ask a Question

Usually answered in minutes!

Top Radio Communications Experts

eradiostore
eradiostore

Level 3 Expert

1654 Answers

Brad Brown

Level 3 Expert

15557 Answers

Mike Charette

Level 3 Expert

1795 Answers

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

Answer questions

Manuals & User Guides

Loading...