Thread: Question Range without BODA
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Old Nov 20, 2010, 02:01 AM
A.T. is offline
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Optima Transceivers - Operating Range

Originally Posted by sbc View Post
How much range will I sacrifice if I remove the BODA? What is the official range of Optima Rxs?
1.Removal of BODA antenna - Existing threads.
Optima 7 converted for small model use - less Brass Booster
Lightweight Mods to Optima 7 RCVR
Hitec's 2.4Ghz without BODA Antenna
However, if using a standard BODA antenna and the important tip wire is removed, then range is negligible, refer
BODA Antenna Tip Wire (DIY Security for receivers manufactured pre Apr10.).

2. Transmitters, irrespective of cost, are limited by various governments as to their maximum output.
e.g. Hitec Eclipse has maximum permitted transmission strength, "equal to other high end TX: out of sight" being over 3.2km (2.5 miles)". Hitec FAQ. Accordingly, other top end TX have similar maximum permitted output and range on PPM, but there are considerable variances with 2.4Ghz as some early non AFHSS transmisson types are known to be blocked by almost every obstacle.
The common standard for a full range receiver is 1500 m+ (1 mile). This is also assumed to mean as far as we can see the model without using optic aids such as telescopes, binoculars and such. Park flyers generally 100< 600m. Backyard 5<100m.

Optima Minima 6E & 6T, Optima 6, 7 & 9 Transceivers are described as full range. Signal range of Rx. expands.

Range is also governed by surrounding terrain and conditions so no manufacturer has ever stated an exact range for either TX or RX. This is why range tests are recommended at the field immediately before every flying session, not only to check the model and all it's functions are operating correctly, but also to test surrounding conditons which may well be different from previous visit. The greatest factor being the performance of the receiver to exclude all other noise and in case of the Optima which is actually a transceiver, it has been demonstrated, as shown in the many reviews, to have better performance than others e.g.
Optima Transceiver (RX) - Installation RX & BODA Antenna, Volts & Range Test Results.
Optima Transceiver (RX) - Independent Comprehensive Range Test "The Hitec system worked as well as any I have tested and better than most. It performed better than the Futaba FASST, the Airtronics, the XPS and the JR low end receivers. It performed at least as good as my reference receiver, the JR AR7000." NB: AR7000 tested with TX output double that permitted in almost all other known countries. However, output of the Aurora is universally permitted, thus in reality a superior performance.
2.2km ground level !!! - "Rx was inside the car, placed in the back, having direct vision to the transmitter via the rear window" "stop the test because of the field iregularities", "I guess that this system can do more than 4km in the air ".
Optima Transceiver (RX) - Conversion for Indoor and Park-Flyers pending release of Minima 2.4GHz series. Hitec "Factory Pilot" Brandon Chitty uses the Optima 7 in his indoor competition aircraft (Fancy Foam Maxima) that weighs 8oz, as well as his 170CC DA powered 42% Aeroworks Yak.
Telemetry - Range test Using Segway & GPS - Video - Remarkable 2100+ft not only through large obstacles but also with Heli sitting in ground effect.

11Dec10 added:
Range of Aurora Telemetry System with standard Antenna:
The Hitec AFHSS 2.4Ghz system on the ground has been tested to 3 miles+ so at 5280' per mile, that's over 15000' which is well beyond visual range.- Mike.

and more at
Aurora A9, Spectra Pro & Optima - FAQ & Undocumented Features - Mixes, Setups, Tips.

Hitec Aurora 9 FAQ's new 20Nov2010

Alan T.
Alan's Hobby, Model & RC FAQ Web Links

(PS: sorry about lengthy answer, used to combine a few previous posts as a reference point.)
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Last edited by A.T.; Dec 10, 2010 at 07:18 PM. Reason: add postscript 11Dec10
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