72mhz futaba 7chp won't transmit

jrod155 · 01-22-2009, 01:14 AM

weird issue, the tx has power, but won't transmit a signal, anybody ever heard of this? I've already tried switching around crystals, i use this tx with a heli and a plane. I reset the tx, didn't help. I think my battery is dying, it says 11 volts on the screen after charging, but 15 minutes later it will be down to 4 volts and beeping. Is this(not transmitting) a safe guard built into the radio? thanks for the help guys, i don't wanna drop a bunch of money on a new tx.

lumpy · 01-22-2009, 02:07 AM

I would send it ( and rx ) in for a profesional service and tune asap ! The battery could be dying , but it could also be a short draining it ( besides I would have thought it would still transmit whilst it was reading good voltage if the battery was the only fault . Or upgrade

drrm123 · 01-23-2009, 11:32 PM

did you check the receiver? could be oil in it, try to find someone with similar radio and see if their receiver picks up your radio signal.

DavidH · 01-24-2009, 09:39 AM

The transmitter is switchable for modulations. You can set it for PPM or PCM. If the receivers are PCM , the transmitter needs to be set to PCM modulation and vice versa for PPM.
As for the battery, With what your describing, it sounds like the battery pack has one or two cells bad in it. It should show about 11.7-11.8 volts when fully charged. And with the quick discharge your experiencing. I would think there is a couple of cells in the pack that are bad.

Check you modulation setting first and then if that cures the problem., Get a new battery for the tranny.

David

01-22-2009, 01:14 AM	#1
jrod155 Registered Users Join Date: Jan 2009 Location: Redondo Beach, CA	72mhz futaba 7chp won't transmit weird issue, the tx has power, but won't transmit a signal, anybody ever heard of this? I've already tried switching around crystals, i use this tx with a heli and a plane. I reset the tx, didn't help. I think my battery is dying, it says 11 volts on the screen after charging, but 15 minutes later it will be down to 4 volts and beeping. Is this(not transmitting) a safe guard built into the radio? thanks for the help guys, i don't wanna drop a bunch of money on a new tx.

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01-22-2009, 02:07 AM	#2
lumpy Registered Users Join Date: Aug 2008	I would send it ( and rx ) in for a profesional service and tune asap ! The battery could be dying , but it could also be a short draining it ( besides I would have thought it would still transmit whilst it was reading good voltage if the battery was the only fault . Or upgrade

01-23-2009, 11:32 PM	#3
drrm123 Registered Users Join Date: Jan 2009 Location: Red Bluff CA	did you check the receiver? could be oil in it, try to find someone with similar radio and see if their receiver picks up your radio signal.

01-24-2009, 09:39 AM	#4
DavidH My HF Map location Join Date: Mar 2004 Location: Birmingham, AL	The transmitter is switchable for modulations. You can set it for PPM or PCM. If the receivers are PCM , the transmitter needs to be set to PCM modulation and vice versa for PPM. As for the battery, With what your describing, it sounds like the battery pack has one or two cells bad in it. It should show about 11.7-11.8 volts when fully charged. And with the quick discharge your experiencing. I would think there is a couple of cells in the pack that are bad. Check you modulation setting first and then if that cures the problem., Get a new battery for the tranny. David