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Old Jul 04, 2011, 11:58 PM View Post
hatsglasses
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Old Jul 05, 2011, 04:46 AM
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Old Jul 12, 2011, 09:01 PM
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Oak Ridge, NC
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A new 6 channel micro receiver has been announced that is S-FHSS compatible.



The super small and lightweight R21065GF 2.4GHz 6-Channel Micro Receiver from Futaba gives the option of High Speed mode with digital servos and fail safe on all channels. It can handle high voltage ranges (4.8-7.4V) and is compatible with all Futaba FHSS/S-FHSS transmitters.*
FHSS/S-FHSS is not compatible with FASST systems.

Specifications:
Size: 1.5 x .85 x .40 inches
Weight: 4g with case

FUTL7605 R2106GF 2.4GHz 6 Ch. Micro Receiver Retail:$39.99 Street:$34.99

The Futaba R2106GF Micro Receiver will be available late July.
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Old Jul 12, 2011, 09:27 PM
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Cool !!

Vien
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Old Jul 12, 2011, 10:56 PM View Post
jack lj
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Old Jul 13, 2011, 03:27 PM
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no sbus features specifically for their gcy750? i get it they want you to shelve out more dollar for the 7fg right ? .... Riiiiight.....
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Old Oct 12, 2011, 01:39 PM
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I am considering this radio as a replacement for my 72 Mhz. 6EX. I was wondering about the battery requirement of the 6J transmitter as well and found this interesting article.

http://www.eznec.com/Amateur/1.5_vs_..._Batteries.pdf
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Old Oct 29, 2011, 02:02 PM
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I'm going to wait and see what the new 8J has to offer before I upgrade my 6EAX (72MHZ) to 2.4 GHZ.

Jim
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Old Oct 29, 2011, 08:17 PM
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Melbourne, Australia
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Quote:
Originally Posted by Scott C View Post
I am considering this radio as a replacement for my 72 Mhz. 6EX. I was wondering about the battery requirement of the 6J transmitter as well and found this interesting article.

http://www.eznec.com/Amateur/1.5_vs_..._Batteries.pdf
Interesting data. It is a good guess that the Tx operates at 3.3V. If it uses the cheapest possible regulator it will need at least 5.3V input or with an LDO regulator, 4.3V. With only four cells that corresponds to 1.33V per cell or 1.08V per cell.

Now consider that 500mA is a high drain for an AA cell and that modern 2.4GHz Tx typically draw less than 150mA and many less than 100mA. So it is worth taking a look at some data that compares performance at something like 100mA. Note that "DC" is Duracell Copper-top. The other curves are other brands and the "ET" is an exotic Energizer Titanium.





Those curves make it seem likely they are using an LDO regulator or else a 4S alkaline pack would not give adequate run time. So if that is the case then they only need 4.3V input and it does seem likely that a good quality 4S NiMH pack would perform as well or better than a 4S alkaline pack.

I guess we won't know for sure until someone does some testing for us to determine the current draw and dropout voltage of this particular Tx.
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Old Nov 03, 2011, 10:34 AM
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The manual for the T6J states that the low voltage warning is to be set at 4.2V when using AA Alkalines. If the low voltage warning goes off at 4.2V, then the transmitter should work even lower.
What is not answered in the manual, is whether there is any other setting than the 4.2V for Alkaline, or 5V for 5 cell Nimh. The 4.2V setting would be a bit low for 4 cell Nimh, and the 5V setting would drive you nutz with only 4 Nimh cells installed
Pete
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Old Nov 03, 2011, 10:40 AM
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Ok, I am in. Tower Hobbies has a two day sale that started yesterday on the 6J with four servos 159.96!

http://www3.towerhobbies.com/cgi-bin...&I=LXAVSW&P=ML
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Old Nov 03, 2011, 10:52 AM
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Such a deal
Very good price!
Pete
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Old Nov 03, 2011, 11:19 AM
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Melbourne, Australia
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Quote:
Originally Posted by pilotpete2 View Post
The manual for the T6J states that the low voltage warning is to be set at 4.2V when using AA Alkalines.
That is useful info, thanks.
Quote:
If the low voltage warning goes off at 4.2V, then the transmitter should work even lower.
Perhaps, but there is no way to know how much lower. Also, 4.2V implies 1.05V per cell, which is extremely close to absolutely dead flat for alkaline cells so if the warning goes off, I wouldn't be doing anything but landing real soon.
Quote:
What is not answered in the manual, is whether there is any other setting than the 4.2V for Alkaline, or 5V for 5 cell Nimh. The 4.2V setting would be a bit low for 4 cell Nimh, and the 5V setting would drive you nutz with only 4 Nimh cells installed
If you look at the discharge curves I posted above, 1.05V/cell is just as useful for good quality 2000mAh NiMH as it is for good quality alkaline cells. In both cases the cell is over 90% discharged and close to the point where the voltage goes over the knee.

Based on the figures, you could safely use four Eneloop AA cells instead of Duracell alkaline ones and have almost identical run time.
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Old Nov 03, 2011, 12:20 PM
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United States, FL, Miramar
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Quote:
Originally Posted by Scott C View Post
Ok, I am in. Tower Hobbies has a two day sale that started yesterday on the 6J with four servos 159.96!

http://www3.towerhobbies.com/cgi-bin...&I=LXAVSW&P=ML
And if you use code # 014F3, you'll get an extra $25.00 off.
That's a $134.96.

Doug.
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Old Nov 11, 2011, 09:41 AM
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Honey I shrunk the charging port.

The charging port on this transmitter is micro. I am sure Futaba changed this to keep folks from using a wall-wart eight cell charger on just four cells. I will probably try to match the port to a coaxial plug at the local computer repair shop. Coaxial plugs from Radio Shack have such horrible reviews, I am afraid to chance it with my equipment.
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