Futaba Magnum 3PM-FS 75MHz

[cjs]

Does anyone have any experience with this transmitter? I recently picked up a few compatible receivers with 3 different crystals. All receivers and crystals seem to work, but the range is terrible. With the same battery, esc, and servo on my Spektrum DX3C I have no issues. The batteries in the transmitter are new and the antenna is pulled out fully. I am not above tearing the transmitter apart if necessary. The transmitter was a freebie and the receivers I traded for, but I would like to figure this out so I can give a working system to the neighbor kid.

Thank you,

Chris

 

[cjs]

If it helps diagnose it, I have tried multiple other servos and ESCs, same issue with the 3PM-FS, no issues with the Spektrum

-Chris

 

[FloridaScaleBoater]

If it helps diagnose it, I have tried multiple other servos and ESCs, same issue with the 3PM-FS, no issues with the Spektrum

-Chris

Chris,

Check the connection at the base of the antenna, inside the transmitter.

Is the antenna tight? It is threaded down in there

 

[cjs]

It is threaded in tight. I will see if I can get the TX apart to check out any other connection to the antenna.

 

[BigChuck]

Compatile receivers are not always compatile based on signal/frequency ....That is because the crystals and not all compatible... You will need to verify the correct type of crystal for the receiver. Second: Check RF gain on the radio once you have the first part correct... If problem still persist ....Futaba for a full tune up...

 

[Daniel's Racing]

Does anyone have any experience with this transmitter? I recently picked up a few compatible receivers with 3 different crystals. All receivers and crystals seem to work, but the range is terrible. With the same battery, esc, and servo on my Spektrum DX3C I have no issues. The batteries in the transmitter are new and the antenna is pulled out fully. I am not above tearing the transmitter apart if necessary. The transmitter was a freebie and the receivers I traded for, but I would like to figure this out so I can give a working system to the neighbor kid.

Thank you,

Chris

Chris,

Are they matched pairs of the proper crystals not just the same frequency or the range will suffer tremendously.

 

[Don Ferrette]

Are you using Futaba brand RXs?

 

[FloridaScaleBoater]

Don, Daniel,

The RX's and XTals are Futaba.

Daniel, the TX is a synthesized unit, which is what is making me shake my head.

We had used these RX's is my brother-in-laws boats using the same model radio. So not sure why we have an issue. other than there is a TX problem

 

[LohringMiller]

I replaced the frequency synthesized module on my 4PK with a 2.4 module and it's been trouble free for years. The old module was a little flaky.

Lohring Miller

 

[Mike Hughes]

I too had problems with dialable module in the past. See if you can get one for crystals for testing. If you need one, I got a bunch. I can send you one. With matching crystals

 

[Mike Hughes]

I was jsut looking online to see if the 3pm has a removable module. Could not find it easily. So maybe mine wont work. Offer still stands if it does.

Cya

Mike

 

[cjs]

The 3PM that I have does not have a removable module or a tx crystal. The RX's and crystals are Futaba, as stated above. I was told the TX sat in storage for a while, but this TX shows no signs of wear from prior usage before storage. The reason I was not gifted RX's with the TX was because he gave them away with the cars they were in and he was using Novak synthesized RX's.