Yaesu: FT-60R DC power

[notoriousbpg]

Hi,

I have a US model Yaseu FT-60R that must be charged in the cradle. The cradle is model SBH-13, with an AC adapter model PA-48B.

The PA-48B DC output plug fits the radio directly, and the radio shows 11.7V when plugged into it (close to the nominal 12V output of the PA-48 AC adapter). The manual however on page 9 states that the PA-48 is not designed to be used to directly power the radio (despite being the correct plug and within the 6V-16V accepted input range). Does anyone know why Yaesu would warn against using the supplied AC-DC plug to power the radio via DC?

There is a note saying that the PA-48 "may contribute noise to TV and radio reception in the immediate vicinity" - is the "not designed for use" just a disclaimer, and assuming no noise is present, would it be fine to use this for powering the HT directly? Or do I really need to go an find another DC power source for directly powering this radio when used at home?

 

[Murphy625]

I own an FT60r but haven't taken that close a look at your issue.
My best guess:

When I looked up the PA-48B, its rated for 110 input and 12vdc @ 0.6 amps output. That means its delivering 7.2watts (12v x 0.6a) of power.

When I looked at the radio's manual, it says it pulls 1.5amps @ 7.2v on the 144 band and 1.6amps at 7.2v on the 440 band.
1.5 amps x 7.2v = 10 watts on the 2 meter side.

That means the transformer, which is designed (sized) to power the charging station, and which is rated for 7.2 watts of power, is being used on a device that wants 10 watts of juice.

You might burn out the little wall transformer.

So knowing the power requirements, it would seem that the radio pulls 5 watts of juice just to run its own brains while transmitting.. add to that the power being transmitted (up to 5 watts), and we get a picture of what's happening.

 

[N4KVE]

It means it is only capable of charging the battery. It is NOT capable of powering the radio. Keep radio off while charging.

 

[KC4RAF]

Agree with N4KVE above. Used to charge only.

 

[ko6jw_2]

Yaesu sells DC power cords and cigarette lighter cords which are designed to operate the radio at full power. The wall wart chargers are just that - chargers. Newer radios are supplied with switching power supplies for charging - no transformers.

 

[notoriousbpg]

Thanks - totally overlooked the ability of the PA-48 to supply the desired power.