Question about Vertex FNB-33, YAESU,FT-11R,FT-41R,FT-51R, 4.8v 1700mAh NiCd 2-Way Radio

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Powering Yaesu FT-11R from an external supply

I have downloaded the schematic for the FT-11R. It shows a "Contact Unit" as the interface between the rest of the radio and the supplied battery which is 4.8 VDC. The radio is supposed to be able to operate up to 9.6 VDC.

The problem is that the supplied battery pack and the radio have 4 pins going from the radio to the battery pack. Clearly, one pin is + 4.8 VDC, one is ground. The problem is what is the function of the other two pins?
One is labeled "Battery Select" and the other "Adjust" on the schematic, but what do these really do?

Has anyone simply hooked up the + and minus leads to a bench power supply without causing any harm?

de Rich, W6APZ

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6 Suggested Answers

  • 1 Answer

SOURCE: Yaesu FT 11R

figured out how to solve this, with the radio off, push and hold both up and down scan buttons, while powering the radio on. This will fix the problem.

Posted on Jan 10, 2009

  • 11 Answers

SOURCE: I need to replace the internal lithium battery on

I have a Yaesu FT-415 and the same problem. My original battery is a SONY 1220-VJ2H (solder tabs, blue insulation on the outer edge and two stick-on paper insulaters) and is soldered in to the Control PC board (mounted vertically). I'm going to get a new battery and hopefully am brave enough to get the soldering iron to the board. It looks like you have to unsolder the board from the speaker to lift it up enough to get at the solder tabs on the battery, luckily I have access to a Pace soldering station with a vacuum pump. I'll hopefully try this next week and get back to you all.

Posted on Jul 11, 2009

  • 1 Answer

SOURCE: Yaesu ft-50r HT getting very hot and not charging battery

From the description your battery has one or more shorted cells. Replace the battery.

Posted on Mar 17, 2010

  • 14 Answers

SOURCE: i need a new battery for a yaesu ft 26

Try "Batteries Plus" either online or possibly a local outlet. I found the batteries for my FT51 there and half the price of the factory ones.

Posted on May 20, 2010

walesarumi
  • 6993 Answers

SOURCE: I have a Yaesu FT-51R purchased in mid-year 1995.

Hello,

Yes, it is possible to use the FNB38 NiMH batteries or any other battery as long as it is the same size and the same volt. Once the battery can fit into the radio and charger and has the same volt, then it is definitely going to work.

I hope the above is clear and understandable, if not, please let me know.

Good luck.

Posted on Apr 25, 2011

  • 27 Answers

SOURCE: Hello! I've a couple of

It's difficult to open the Vertex packs without ruining them. FNB27 is widely available on eBay or you can get them from manufacturers such as W&W in Hicksville NY online. I don't know if anyone has made them in Lithium Ion yet.

Posted on May 01, 2011

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Powering the Yaesu FT-11R


The battery select determines whether you're using a NiCd or Alkaline battery, I believe the "adjust" is used to put the radio into service mode. If there's not an "auxiliary power input" you can hook up the bench supply to, check the battery output for the voltages and polarities, and hook up your supply accordingly.

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Yaesu FT 11R


figured out how to solve this, with the radio off, push and hold both up and down scan buttons, while powering the radio on. This will fix the problem.

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Yaesu/Vertex FT-51R Repair


You can order the parts from Yaesu or your local Yaesu dealer can do it for you.

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