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Author Topic: Robbe futaba rf4044  (Read 3346 times)

Robin smith

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Robbe futaba rf4044
« on: February 02, 2016, 08:20:37 PM »

Need some advice ....why did I sell my Robbe F14 navy ....I need something 40 MHz for my Engel Type 7c. Would the Robbe Futaba RF4044 40mhz work ok? I can get one at Cornwall Model Boats? Some on EBay but always unsure. Thanks
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timgarrod

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Re: Robbe futaba rf4044
« Reply #1 on: February 02, 2016, 09:36:17 PM »

if thats the Futaba f16 boat and truck then yep. thats what I use.
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TomHugill

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Re: Robbe futaba rf4044
« Reply #2 on: February 02, 2016, 10:37:57 PM »

Any futaba should work
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Subculture

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Re: Robbe futaba rf4044
« Reply #3 on: February 02, 2016, 11:30:12 PM »

Got a few choices still. 40mhz gear is still fairly easy to track down on the secondhand market. Plus some places will carry a bit of old stock, although choice is much reduced compared with a few years ago. Another alternative is open LRS 433\458 MHz which can be used with modular sets. The snag with that is you have to be comfortable with setting up the system with a computer, which is likely to put less techy modellers off, in spite of the online guides.

essex2visuvesi

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Re: Robbe futaba rf4044
« Reply #4 on: February 02, 2016, 11:33:37 PM »

Ebay Germany is a good source of good quality used 40Mhz gear
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Re: Robbe futaba rf4044
« Reply #5 on: February 02, 2016, 11:37:37 PM »

If you wish to stick with 40mhz, then l would try and find synthesised TX and RX. That eliminates sourcing pesky crystals, and gives you lots of flexibility if you sail with lots of other users on the band.

Stavros

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Re: Robbe futaba rf4044
« Reply #6 on: February 03, 2016, 12:11:48 AM »

Ive got 2 40 mhz sets and recievers steering wheel type pm me if interested


Dave

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Robin smith

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Re: Robbe futaba rf4044
« Reply #7 on: February 03, 2016, 12:35:49 AM »

Thanks guys much appreciatted
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Davy1

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Re: Robbe futaba rf4044
« Reply #8 on: February 03, 2016, 08:55:26 AM »

Hi Robin,

40Mhz or openLRS is not an easy decision to make.

If you go for 40Mhz you are investing in elderly technology with a diminishing pool of equipment. You also have the problem of "peg boards" etc. if you go to any event (e.g Bournville Dive-Ins or Norwich) where there are a number of people using 40Mhz.

openLRS (on 458Mhz in the UK) is still a bit "techie" but it has significant benefits:

- no need for pegboards.
- very smooth control.
- telemetry (if you want it)

It is only techie if you are trying to get it working by only reading about it. If you can afford to wait a few months you can get to some sub events where you can see someone using it (a growing number) and talk to them about setting the gear up. If you can wait for Haydock Park (OK I know it is August!) you can talk to people on a stand. We did this last year.

But if you are in a real rush to get your 7c wet, I would probably go for secondhand 40Mhz gear if it wasn't too expensive.

David
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Re: Robbe futaba rf4044
« Reply #9 on: February 03, 2016, 11:11:46 AM »


Personally I would only go the Open LRS route if you feel comfortable with setting this up under your own steam.

Alternatively if a 460 mile round trip to set up your radio sounds like a good option, then the best of luck to you.

john44

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Re: Robbe futaba rf4044
« Reply #10 on: February 03, 2016, 01:21:37 PM »

Hi Robin, have you seen the Robbe F14 Navy double twin stick 40 MHz in the for sale section
Of the forum?


John
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Robin smith

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Re: Robbe futaba rf4044
« Reply #11 on: February 03, 2016, 11:29:36 PM »

What is LRS guys ?
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Re: Robbe futaba rf4044
« Reply #12 on: February 03, 2016, 11:36:34 PM »

Stands for long range system. The open part indicates the source code is open source for modding/customisation. In a nutshell it's a higher frequency system than 40 MHz which allows higher bandwidth permitting frequency hopping like 2.4ghz, but the frequency is low enough to penetrate through the wet stuff!

Davy1

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Re: Robbe futaba rf4044
« Reply #13 on: February 04, 2016, 09:40:19 AM »

It is a technique developed for "drones" but Tim Senecal in the States discovered  that it also works for model submarines. His work is written up on the "SubCommittee" website and now on "Subpirates". The AMS got the UK frequency of 458Mhz approved.

It works for us because (a bit like Goldilocks!) the frequency is not too high. Our data transmission is not too high. (It adopts modern frequency hopping and error checking methods.)

The equipment is quite cheaply obtained from Hobbyking (No I don't get any benefit!) The "How to Guides" are on the above websites and the AMS Forum.

Have a go and as I said before come and have a look at it at some event, if you can. Seeing is believing in this business, believe me!

David
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Re: Robbe futaba rf4044
« Reply #14 on: February 04, 2016, 10:49:16 AM »

458mhz has been legal (with certain limits) for decades.

Anyone remember the Reftec radios sold by Ripmax back in the 1970's?

http://www.vrhc.co.uk/Heli%20Gear/Radio%20gear/1970's/1978-10%20-%20Reftec%20UHF%20review.pdf

You have to remain under 500mW to stay legal in the UK, be aware that Hobbyking sell a 1W transmitter module, but bench tests have shown that this in fact chucks out half that power.

The standard 100mW module seems to be doing the job well however, so no need to go for the burner!

433mhz is also legal, but has a much cooler wattage restriction of 10mW, so probably not so useful.

Also be aware that the legalities change from country to country, so if you intend to travel with your boat, then the UHF systems are more restricted.

tsenecal

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Re: Robbe futaba rf4044
« Reply #15 on: February 05, 2016, 04:43:37 AM »

one of the model submariners who posts on the AMS site is from belgium, and he and i did some testing. at a mid-level power output setting, the 100mw hobbyking module can be limited to output at 6.5mw.  this is below the threshold required for the 433mhz usage in EU, and my testing here in the states showed that it worked down to about 3 feet in a chlorinated pool...  so the belgian is happy.

http://www.theassociationofmodelsubmariners.com/t83p90-2-4-ghz-and-submarines-also-458-9-mhz#9638
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