Re: Power consumption of the Futaba 9C with various modules

Doug McLaren wrote:
> I finally got one the 9C synthesized modules, and people had talked
> about the power consumption of them, so I went ahead and measured it.
> (Well, I measured current consumption, but if you really want power,
> assume 10 volts.)
>
> 9c with no module at all 77 mA
> with Futaba synthesized module, antenna down 257 mA
> with Futaba synthesized module, antenna extended 287 mA
> with 50 mHz module, antenna down 235 mA
> with 50 mHz module, antenna extended 200 mA
> with 72 mHz module, antenna down 160 mA
> with 72 mHz module, antenna extended 214 mA
> with Hitec Spectra module, antenna down 311 mA
> with Hitec Spectra module, antenna extended 280 mA
>
> I was surprised at a few things --
>
> -- that the 9C itself used so little power
> -- that some modules used more power with the antenna down. and
> some used more power with the antenna up, and that the two
> non-synthesized modules differed in that respect.

A couple of years ago I was playing with my old JR radio looking at the
magnitude of the carrier on an oscilliscope - I ound that as I varied the
antenna length, the strength of the signal varied. The strongest signal was
achieved at about 2/3rds extention, and at that point the radio's power
consumption was lowest.

I should try the same experiment with my newer radio...


.

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