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HelicopterMain Discussion › 9z Synth questions
05-02-2004 04:17 AM  13 years agoPost 1
Dr. Fibinotchi

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Sioux Falls SD

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I am working with a 9z and have the synth mod. I had it on a good part of the morning with the antenna out and on caliubrating a new ship. I came home another weekend and switched to a diffrent model and tried to switch to a diffrent frequency for another bird, but found the menu was not there for me to change it. I re pluggewd the mod in and found the same thing. I am only guess, but think it had go too hot even though the antenna was out?? Or is this something simple to change or test??

anyone else running just a synth trans mod??


Baffled and bewilered.///
-Cody

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05-02-2004 04:38 AM  13 years agoPost 2
BladeStrike

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Shelby Twp, MI

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Dr. Fibinotchi;

I am running the 9Z with the syn module. Have you checked the SYStem menu? FRQ should be on the second line. IF not ensure your syn module is plugged in securely

ALSo do you know you can connect your tranny to the heli by connecting the DSC cord to your reciver. That eliminates hogging the frequemcy at the field/ funfly

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05-02-2004 05:16 AM  13 years agoPost 3
Dr. Fibinotchi

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Sioux Falls SD

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dcs

Yea I did plug in the dcs after a while. I did make sure it was plugged in good as well, but it was not found in the sys menu like I knew it was before.

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05-02-2004 06:10 AM  13 years agoPost 4
Hughes500Pilot

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Anaheim, CA

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I hate to say it, but you might of fried your RF module. You should NEVER turn your radio on with the antenna down (or removed) for more then a few seconds. The radio enegry has to go somewhere... If it is not coming out of the radio via the antenna, it is staying inside and building up as heat.

If you are going to program your radio, turn off the RF output. This will eliminate the problem. You simply hold down the "A" (or "R") button when you turn on the radio. You will notice it does not flash "ON AIR" when you do this. -Steve

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05-02-2004 10:10 PM  13 years agoPost 5
pilotError

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Long Island, NY

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Check the pins

Pull the Synth module out and check the pins on the back of the radio. These have a habit of bending sometimes and can cause the problem your seeing.

Mike...

Good Judgement comes from Experience. Great Judgement comes from Bad Experience.

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05-02-2004 10:49 PM  13 years agoPost 6
Wes

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Jonesboro, AR

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BS

Hughes is full of **** don't listen, it doesn't hurt the z to turn it on and use i with the antenna down. He's feeding BS, I find it odd that some people have more hours on their radios with the ant down than most people have on their radios with nooo problems...

You can't fix dumb...q

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05-02-2004 11:06 PM  13 years agoPost 7
Hughes500Pilot

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Anaheim, CA

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Wes,

Sorry you feel that way. I am only relating what it says in the instruction manual.

My goal was not to "feed BS" or start any type of flame war. However, since the Futaba 9Z instructions specifically say not to do this, it must be for a reason. Now using common sense, it is pretty clear to realize the generated RF enegery has to go somewhere. Normally, it goes out of the radio via the antenna. But, if the antenna is down or removed completely, where does it go? The answer is that it stays in the transmitter. This enegry then builds up as heat.

All that heat "can" build up and do damage. I'm not trying to say it will in every case and every instance... Simply that it can - And that turning the radio on (without first turning of the RF output) with the antenna down or removed is discouraged by the manufactuer.

-Steve

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05-02-2004 11:20 PM  13 years agoPost 8
Dr. Fibinotchi

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Sioux Falls SD

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guys.

To make it more clear yes I had the antenna out. The larger bas was out two and the rest was folded up. Of course I dont have the antenna in with the synth. I have checked the pins and found none that where bent to any significance. I am thinking I will sen it in this week...

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05-03-2004 04:51 AM  13 years agoPost 9
Ace Dude

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USA

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Hughes, you're right on the money. Anyone who knows anything about RF knows what SWR is and knows that a high SWR is not a good thing. Personally, I never key up any of my TXs without an antenna attached. And while Futaba stats that only the bottom must segment be extended I don't transmit unless my antenna is fully extended. Better to be safe than sorry.

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05-03-2004 06:14 AM  13 years agoPost 10
peterpiper

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Reno, NV

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I read what this WES guy typed and I just had to chime in. I dont know where he gets off saying HUGHES is feeding bull ****. In fact, HUGHES is 100% dead on accurate.

As a Ham Radio Operator of over 25 years, I think I know a little about radio waves. Without getting too technical, trust me when I say radio signals must go some were. If they are not radiated out of the transmitter, they will in fact radiate out as heat build up. That is the main reason we use dummy loads when we are setting up / testing ham radio stations.

This WES guy just sounds like a hot head who wants to be the local know it all. Sure, maybe he has been lucky over the years by turning on his transmitter with the antenna removed and not having any problems. But, it does not mean it is wrong and that he might not mess up his transmitter in the future.

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