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Old 02-04-2007, 03:13 PM   #496
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Quote:
Originally Posted by Bob-Stormer
tag for later.
Does that mean I'm "it"???
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Old 02-04-2007, 03:51 PM   #497
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What is this all about..."spread spectrum brushless"

http://www2.towerhobbies.com/cgi-bin...M8548&C=MHFMPU

No info on the Novak site yet.
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Old 02-04-2007, 05:00 PM   #498
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Here's the press release:

Quote:
Irvine, CA – January 29, 2007 —While spread spectrum or DSM (Digital Spectrum Modulation) technology has only been in the R/C industry for a few years, it has gained quite a following due to its ability to offer racers freedom from radio interference. Novak is the first to acknowledge this with products specifically designed to take full advantage of DSM technology. Novak’s response is the first speed controls optimized for spread spectrum transmitters: the #1711 GTB Spread Spectrum Brushless/brush ESC and the #1715 GTB 4-Cell Spread Spectrum Brushless/Brush ESC.

Always a technological leader, Novak has upgraded the GTB ESC to work with spread spectrum systems from manufacturers such as Spektrum™, Nomadio™, and Futaba™. Since DSM uses a much higher frequency, 2.4Ghz to be precise, this has allowed Novak to finally unleash the full potential of the GTB speed control. Both new GTB models now have significantly faster MOSFET switching speeds, which provide improved performance and cooler operating temperatures. In short, the ESC gets power and increased operational efficiency at the same time!

MOSFET switching speed is a key feature for the spread spectrum specific GTBs. The MOSFET switching speed is not just the frequency of the ESC, it’s actually how fast the ESC’s MOSFETs turn on and off. With regular radios, ESCs are limited by how fast they switch on and off. If it switches too fast, the radio system will experience interference. With DSM this is not an issue. Novak Engineers have been able to take full advantage of this great new technology and now offer a high-speed switching GTB for all the spread spectrum/DSM users. While users should not expect a huge difference in feel or driving style, they will notice improved motor operation and lower ESC operating temperatures.

While Novak’s two new GTB models have been equipped to work with spread spectrum technology, all of the same great Novak features have been left intact, including six throttle profiles (5 brushless, 1 brushed). These versatile ESCs are compatible with all Novak 540-size sensored brushless motors, and have no brushed motor limit. A user-friendly interface along with 4 different color status LEDs make programming the GTB extremely easy. The brushless mode has 4 adjustable parameters, including Minimum Brake, Drag Brake, Deadband, and Minimum Drive. The brushed mode is fully programmable with all of the adjustments of the brushless mode, plus adjustable Drive Frequency. The GTB also uses exclusive lightweight MOSFET technology, which have the lowest ‘RDS On’ value, and which allows the speed control to have the highest power density.

Both the #1711 GTB Spread Spectrum Brushless/Brush ESC and the #1715 GTB 4-Cell Spread Spectrum Brushless/Brush ESC are scheduled to ship March 2007. The list price is $325.
GTB SPREAD SPECTRUM BRUSHLESS ESC FEATURES:
Ř Optimized for use with Spread Spectrum Transmitters for improved performance and cooler operating temperatures
Ř Compatible with brushless and brushed motors
Ř Includes five brushless throttle profiles (#1711 has 3 forward/brake and 2 w/reverse; #1715 has 4 forward/brake specific for 4-cell racing and 1 w/reverse)
Ř Includes one fully-adjustable brushed throttle profile (forward/brake)
Ř 4 Adjustable Parameters: Minimum Brake, Drag Brake, Dead Band, and Minimum Drive, as well as Drive Frequency (In Brushed Mode Only)
Ř User-friendly programming interface with 4 status LEDs
Ř Novak’s One-Touch Set-Up (still the easiest)
Ř Gold-Plated PCB Direct-Solder Wiring Tabs
Ř User-replaceable input and switch harness (#1711 is plug-in style; #1715 is re-solderable)
Ř Thermal Overload Protection
Ř Water-resistant case
Ř Factory-installed power capacitor module
Ř #1711 includes clear cooling fan (30x30x8mm) mounted on factory-installed heat sink
Ř Radio Priority Circuitry
Ř Polar Drive Circuitry
Ř Designed, manufactured, and tested in the USA
GTB SPREAD SPECTRUM BRUSHLESS ESC SPECS:
Forward/Reverse....................... Forward/Brake/Reverse (Brushed mode is Forward/Reverse)
Input Voltage............................ 4-6 cells (#1711); 4 cells (#1715) Ni-Cd/Ni-MH cells (1.2V/cell or
4.8-72. total volts)
On-Resistance.......................... 0.00040 ohms (brushless)*, 0.00013 ohms (brushed)*
Footprint.................................. 1.16” x 1.49” (29.5 x 37.8 mm)
Weight..................................... 1.36 oz / 38.6 g (#1711); 1.01 oz. / 28.5 g (#1715)
Rated Current........................... 540 amps per phase (brushless)*, 1620 amps (brushed)*
Braking Current........................ 540 amps per phase (brushless)*, 1620 amps (brushed)*
Power Wires............................. 16-GA (#1711); 14-GA (#1715)
BEC........................................ 6.0 volt/3.0 amp
Motor Limit............................... Any Novak 540-size brushless motor; No brushed motor limit
Discrete Steps.......................... 1024 Forward; 1024 Reverse
Battery Plug............................. None
Motor Plug................................ None
Drive Profiles............................ 6 (5 brushless, 1 brushed)
Status LEDs............................. 4
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Old 02-08-2007, 11:48 AM   #499
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I'm on my second GTB/13.5 combo... one on an MRE and I just installed one on my Evo V. So I am going through the setup and I come across Step 4F under Transmitted Adjustments:

Set Electronic Trigger Throw Adjustment to 70% throttle and 30% brake throw (or 7:3)

I use an Airtronics M11 radio... Can anyone tell me where and what adjustment this is???
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Old 02-08-2007, 12:20 PM   #500
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Throttle EPA
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Old 02-08-2007, 12:23 PM   #501
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Quote:
Originally Posted by Tony Vega
Throttle EPA
I don't think it's Throttle EPA. Step 4A and 4B addresses Throttle EPA and I have that set correctly.
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Old 02-08-2007, 04:16 PM   #502
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This adjustment basically sets where the neutral point is on the trigger throw. With the mechanical equivalent you will see the trigger neutral spot actually move. At 50:50 the neutral will be at the 50% position of the full back and forth throw. At 70:30 the trigger will 70% of the total throw when pulling back/throttle and 30% when pushing forward/brake.

The electronic adjustment does the same thing except its done electronically and you don't actually see the trigger move positions on your radio.

With a 70:30 setup you get finer control on the throttle side compared to a 50:50 setup.
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Old 02-08-2007, 04:28 PM   #503
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Thank you for the reply. I started a new thread and got my answers there. Apparently the M11's trigger throw is factory set at 70:30 and it cannot be changed electronically nor mechanically.
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Old 02-12-2007, 03:12 AM   #504
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I've seen the announcement that in April, you will be able to buy a "Pro" version of the 13.5 / GTB combo which means that the sintered rotor is already present.

I saw a post on another forum (but then lost track of where I found it) that someone has already been able to purchase the 13.5 Pro motor (not the system with the ESC, just the motor). But a search online did not turn this up and any online vendors. Is the 13.5 Pro motor available for purchase or must one buy the sintered upgrade separate? Thanks!

PS - Any tips on pinion for an MF2 with a 13.5 / Orion 4800 combo?
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Old 02-12-2007, 07:58 AM   #505
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Default 13.5 w/ sintered

There were some motors with the upgrade sintered rotors available at the Novak Race at Trackside.
Maybe that was the post you saw somewhere.
I got one there. Now just need to get the spur changed and try it out.





thx,
Darrald
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Old 02-12-2007, 08:14 AM   #506
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OK, has anyone seen them online?
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Old 02-14-2007, 02:40 PM   #507
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I cant read the whole post so sorry if this was posted but what is the correct part number for the 13.5 sintered rotor? TIA
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Old 02-14-2007, 03:29 PM   #508
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Quote:
Originally Posted by The8BitHero
I cant read the whole post so sorry if this was posted but what is the correct part number for the 13.5 sintered rotor? TIA
NOV5908 for the Sintered Arm
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Old 02-14-2007, 03:38 PM   #509
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TYVM, and thats a direct fit for a 13.5 direct from the factory? I was skimming the thread and saw some stuff about the endbell.
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Old 02-14-2007, 03:54 PM   #510
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I see that some of you are running profile 2 on your GTB's with the 13.5. I tried to follow the directions that came with the GTB to get it into the programming mode to change profiles but never got all 4 lights to come on. Am I miss reading the instructions or am I doing something wrong?
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