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Transmiter gets warm

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Old 08-04-2003, 05:09 PM
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Waldog
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Default Transmiter gets warm

I just replaced the batteries in an old Futaba "G" series 7 channel transmitter. The nicd batteries came from Mpi. The voltage is correct but the MAH capacity is twice what was in the original batteries (1100 mah vs. 500 mAH). When I turn on the tX the transmitter module on the back of the transmitter gets warm. Not hot, but warm. I transmitters of all types, (communication, transponder, etc.) generate heat. But I don't ever recall feeling a Futaba transmitter getting warm.

Should I be concerned or am I dreaming??
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Old 08-04-2003, 05:51 PM
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aksmithrc
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Default Transmiter gets warm

Futabas get warm just like all others ! Believe it.
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Old 08-04-2003, 06:11 PM
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Shortman
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Default Transmiter gets warm

Make sure your antenna is extended at least 2 pieces out when your trimming and setting up your plane...

Your module will get real warm when you have the antenna down because its sending a single with a retracted antenna..

I don't know all the technical mumbo jumbo but make sure the antennas up heheh (otherwise you may reduce radio range)
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Old 08-04-2003, 07:10 PM
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Lynx
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Default Transmiter gets warm

Depending on where the final RF amplifier is inside the box you might not notice the heat it generates.
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Old 08-04-2003, 08:23 PM
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Rodney
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Default Transmiter gets warm

Always keep your antenna fully extended when doing setup etc. It is okay to have it collapsed for a very short time (like when making a range check) but the SWR (standing wave ratio) goies way up with the antenna partially or fully retracted and the energy normaly being radiated is dissipated in the output stage. mean time to failure is cut in half for every ten degrees C that the temperature rises in the output transistor.
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