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Sanwa MT-4S cutting out at short distances.

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Old 07-29-2022, 12:57 AM
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Default Sanwa MT-4S cutting out at short distances.

Hi. I’ve got a problem with my MT-4S cutting out at relatively short range, sometimes less than 40’.

I’ve tried several ESCs, motors, settings, batteries, receivers, bodies, etc. it only happens with my slash drag car (fast or slow) my Slash SCT, or Slash 4x4, or M Chassis cars…no problem.

Everything in the radio is factory fresh.

Any ideas?
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Old 07-29-2022, 02:21 AM
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Originally Posted by monkeyracing
Hi. I’ve got a problem with my MT-4S cutting out at relatively short range, sometimes less than 40’.

I’ve tried several ESCs, motors, settings, batteries, receivers, bodies, etc. it only happens with my slash drag car (fast or slow) my Slash SCT, or Slash 4x4, or M Chassis cars…no problem.

Everything in the radio is factory fresh.

Any ideas?
Maybe a bad servo in that drag car?
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Old 07-29-2022, 06:45 PM
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Servo is.good. Given all the combinations of components and chassis I’ve tried, it seems the chassis itself could be the issue. Which is completely weird.

My next test will be swapping out the Sanwa receiver and testing with my ancient Spektrum gear.
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Old 07-30-2022, 01:40 AM
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If you have changed everything on the car side then you have to search it at the transmitter side..... If it is new I can imagine there is something wrong with the antenna.
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Old 07-30-2022, 02:10 AM
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Very true. Sadly, the radio is far out of warranty at this point. If it was doing this with my other cars, I’d understand. But, even after taking known good receivers and electronics and installing them, no dice.

I’m going to test using my crawler radio. It’s an old, laggy Spektrum. I’ve also got another cheap, backup radio coming.
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Old 07-30-2022, 06:08 AM
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Originally Posted by Roelof
If it is new I can imagine there is something wrong with the antenna.
Oops, saw this a bit later. Before bed last night, I opened the radio. So far, everything looks perfect. Given the radio’s flawless performance in my other cars, I doubted the antenna would be at fault. I now have the task of figuring out the placement of 30 tiny screws.

Thank you, in any case, for your input.
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Old 07-31-2022, 12:28 AM
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Originally Posted by monkeyracing
. Given the radio’s flawless performance in my other cars, I doubted the antenna would be at fault.

If the same radio/receiver combo works in other cars, it could be interference with your chassis. Is it made of carbon fibre or metal? Are there battery/esc cables that are criss crossing the antenna?
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Old 02-21-2023, 12:41 AM
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Forgot about this. Antenna was unplugged from PCB in the radio. Hopefully I never need to emote it for maintenance, cuz I glued it on there real good.
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