Different Frequency Receivers

[Malakite]

Hio there guys,

I have today taken receipt of an old Vntage Marui Samurai! I am very excited about it as I've liked them for years! One problem, the receiver is a frequency of some '72,000mhz' so not the standard 27 mhz that all of my cars are running on. I thought I'd just replace the crystal but then I notced that the pins for all the servos and the ESP are all three pronged then go into the receiver, not the 'usual' way round that I am used to in the the pins are on the receiver and I would then stick the servo 'female' connection cables into the receiver!

Can I ask, do I need to cut all the connectors off these servos and ESP and connect new ones for a new style receiver, or can I obtain and 27Mhz crystal that would fit into the receiver, as that again has 3 pins and not the standard 2 that I'm used to. Is this because the car has come from outside of the UK or just because it's a totally different style of receiver that I'm used to?

I really need the best solution so that I can get racing

Thanks in advance as always

[fatboyslim]

Hio there guys,

I have today taken receipt of an old Vntage Marui Samurai! I am very excited about it as I've liked them for years! One problem, the receiver is a frequency of some '72,000mhz' so not the standard 27 mhz that all of my cars are running on. I thought I'd just replace the crystal but then I notced that the pins for all the servos and the ESP are all three pronged then go into the receiver, not the 'usual' way round that I am used to in the the pins are on the receiver and I would then stick the servo 'female' connection cables into the receiver!

Can I ask, do I need to cut all the connectors off these servos and ESP and connect new ones for a new style receiver, or can I obtain and 27Mhz crystal that would fit into the receiver, as that again has 3 pins and not the standard 2 that I'm used to. Is this because the car has come from outside of the UK or just because it's a totally different style of receiver that I'm used to?

I really need the best solution so that I can get racing

Thanks in advance as always

Sounds like an old Futaba rx

In short you can't just change the crystals as the rx is 'tuned' to it's frequency range

All this is of no concern really as 72mhz is NOT a legal frequency in the UK

So best advice is bin it and get either a 27mhz or 40mhz one instead

[Malakite]

Sounds like an old Futaba rx

In short you can't just change the crystals as the rx is 'tuned' to it's frequency range

All this is of no concern really as 72mhz is NOT a legal frequency in the UK

So best advice is bin it and get either a 27mhz or 40mhz one instead

Hi yes you are spot on, it IS an old Futaba! Thats interesting about the frequency being illegal in the UK! Out of interest why is it, what does it interfere with exactly, and also who would know if you DID use it?!

So I need to stick a different receiver in, thats fine, but can you tell me what I need to do about the servo and ESC not being compatible with the connections?

Thanks for your reply!

[terry.sc]

Obviously the reciever has come from abroad, where 72mhz is a legal frequency for r/c cars, such as the USA. Fitting a 27mhz crystal won't make it work, you need a 72mhz transmitter and a 72mhz crystal. The servo plugs are the old standard Futaba G plug. You could cut the plugs off and install newer connectors, but you will have 20+ year old servos and ESC. If you plan to do much running you are better off replacing the radio gear with newer items just for the security of knowing your radio gear is going to work properly. There are some of us that collect the old original radio for our vintage models and would like them to have their original plugs.

72mhz is illegal for use in the UK as part of the 27mhz frequency band has been set aside for radio control models, with 40mhz set aside for land based models. A quote from the BFMA

Contrary to some peoples belief, 72 MHz is not a legal frequency for model control in the UK. A manufacturers development license is available (under very strict conditions) to bona-fide designers/manufacturers from the DTI. Anyone using 72 MHz without such a current special licence is operating illegally and may face a fine and confiscation of the equipment.

Amongst the users of the 72mhz waveband are both the military and TV broadcasting, so it would be easy to spot any interference on those frequencies. If you are found out due to interfering with radio transmissions your car will be confiscated.

[Singapore_959]

Obviously the reciever has come from abroad, where 72mhz is a legal frequency for r/c cars, such as the USA. Fitting a 27mhz crystal won't make it work, you need a 72mhz transmitter and a 72mhz crystal. The servo plugs are the old standard Futaba G plug. You could cut the plugs off and install newer connectors, but you will have 20+ year old servos and ESC. If you plan to do much running you are better off replacing the radio gear with newer items just for the security of knowing your radio gear is going to work properly. There are some of us that collect the old original radio for our vintage models and would like them to have their original plugs.

72mhz is illegal for use in the UK as part of the 27mhz frequency band has been set aside for radio control models, with 40mhz set aside for land based models. A quote from the BFMA

Amongst the users of the 72mhz waveband are both the military and TV broadcasting, so it would be easy to spot any interference on those frequencies. If you are found out due to interfering with radio transmissions your car will be confiscated.

3am!

Terry has insomnia like me

[Malakite]

3am!

Terry has insomnia like me

Ok cool so in a nutshell I'm better off replacing the servos! I'd kind of like to keep the ESC in so that its still 100% original if you get my drift, as its great to have a vintage car looking exactly the way it should right? I wouldn't have thought much can go wrong with an ESC anyways???

Terry if you or anyone else would like the old school servos and the receiver, do let me know and we can sort something out!

[DudeWalker]

For the US folks: 72MHz is reserved for RC aircraft. 75 MHz and 27 MHz is reserved for ground (water) based RC.

[stu22]

Not sure what connectors you have but radicalrc.com sells female Futaba-G to Male Futaba-J adapters. Used them when putting a new R603FF receiver in my vintage Grasshopper to reuse the original servo and ESC.

http://www.radicalrc.com/shop/?keywords=AD...mp;cart=2186038

[Malakite]

Not sure what connectors you have but radicalrc.com sells female Futaba-G to Male Futaba-J adapters. Used them when putting a new R603FF receiver in my vintage Grasshopper to reuse the original servo and ESC.

http://www.radicalrc.com/shop/?keywords=AD...mp;cart=2186038

Many thanks but can't see where the connectors are from your link?

[stu22]

Many thanks but can't see where the connectors are from your link?

Sorry about that. The site has some strange way of handling its shopping cart. Do a search on "Adapter Female Futaba G to Male Futaba J" on the site and take a look. Also, since the female G plug is not really obvious, on the page there is a picture of the "Adapter Female Futaba J to Male Futaba G" with the Futaba Male G plug is the one on the left. If your ESC has a plug that looks like that the G to J adapter should work.