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| Electronics Discuss radios, chargers, etc... |
Topic Review (Newest First)
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| 04-28-2016 06:46 AM | ||
| RAMJET |
Re: Which Radio not to buy Quote:
Like my good buddy Dale once told me, if you really want to know how to do something right ask someone doing it right . so true . The real question should be what radio should I buy and how do I use it to be successful . |
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| 04-27-2016 03:33 PM | ||
| fsone |
Re: Which Radio not to buy Quote:
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| 04-26-2016 11:37 AM | ||
| tporter416 |
Re: Which Radio not to buy It is hard to compare Spektrum and Futaba, but lets throw in some info... 1) Futaba uses a Micro Linear ML2724 transceiver for communication for the FASST protocol. This transciever requires a baseband IC for the actual communications protocol, which allows Futaba more control over the communications. This chip according to the press release was launched in Oct 2003. Sensitivity of this chip according to them is 90dBm with 3dBm differential output power max. 2) Spektrum uses an SPI to 2.4GHz converter chip from Cypress, the CYRF6936 chip, which does a lot of the communications overhead for you, basically offloading Spektrum from doing a bunch of the design work. Which means the DSM protocol is mainly done by Cypress. The chip does include CRC checking for packets, and is fully bidirectional data. This chip was launched in, best I can find, Dec 2004. According to the data sheet it has a transmit power up to +4 dBm and a sensitivity of 97 dBm. The numbers for power and sensitivity can be misleading as a lot of that comes down to circuit design and antenna design, so even though the chips can achieve these numbers, it doesn't mean our transmitters can. One interesting note, both chips suggest the applications are wireless mouses, keyboards, gaming controllers, home automation, toys, etc... This doesn't mean that both Futaba and Spektrum have not done a huge amount of R&D to ensure that these systems are safe for use, they know the implications and I am comfortable using either. At my field we have had a lot of experience with Orange receivers cutting out if you get to close to the hydro lines, never seen anyone have issues with Spektrum, Jeti, Futaba or JR at our field... Tom |
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| 04-26-2016 08:40 AM | ||
| adaptabl |
Re: Which Radio not to buy Quote:
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| 04-25-2016 04:23 PM | ||
| stegl |
Re: Which Radio not to buy Quote:
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| 04-25-2016 04:16 PM | ||
| RAMJET |
Re: Which Radio not to buy I had the first Gen spektrum system and I never had brown out problems but I was also one of the first to use a-123 batteries, quite by chance but that proved to be what was needed (a-123/ lipo / liFe) ,My system has since been upgraded by horizon hobby to dsmx, they replaced all my receivers (12 x 9100 power safe ) no charge.cant beat that for service and upgraded my JR 12x to boot . |
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| 04-25-2016 03:51 PM | ||
| Cougar429 |
Re: Which Radio not to buy Not that important, but I thought the Futaba FASST system came out ahead of Spektrum. |
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| 04-25-2016 02:27 PM | ||
| adaptabl |
Re: Which Radio not to buy Quote:
The one other problem is that in having a older 2.4 chipset the sensitivity is much lower than the competition that came to market later. That is the reason Spektrum needs the extra sat receivers. Although they have seemed to resolve the voltage issues and reboot times. They are stuck with a low sensitivity chipset. Unfortunately since the major manufacturers use off the shelf 2.4 G chipsets from cordless phones they have no input on design features for these chipsets and have to live with what is there. |
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| 04-25-2016 10:56 AM | ||
| Cougar429 |
Re: Which Radio not to buy I too run Castle gear and some of their early stuff had problems. They had the guts to admit it and fix them for free. I neglected to mention some other factors that can come into play. Discounting digitals, as the number of servos increases the current demands can increase to where other components in the supply chain will fall short. Most of the stock switches supplied for flight gear are only rated for a max of 4A with the servo/BEC plugs in that range, as well. Add in long servo extensions of thin gauge wire, (24 being common) with multiple plugs and you can exacerbate the problems. One of the biggest current hogs I found were servoless retracts. Good units can have current shutoffs if binding occurs, but almost all have significant draw at the start of the cycle. I often found servo extensions not only the wrong length for my apps, but also using that thing gauge conductor. I stock up on the 22 ga every year in Toledo, along with refilling my plug and pin assortments and fab my own. ps. Although still 72MHz, I opted long ago to go with Castle Berg receivers. In most cases they were lighter, smaller, less expensive and had programmable outputs and failsafe features, the original thinking in using PCM gear. Except for some issues with plug wear for the crystals, prevented by the simple use of tape to keep them rigid, they have proven rock solid. That and their auto-shift capability meant they were compatible with just about every system out there. I've retrofitted only a few craft to 2.4, mostly keeping that to new builds. If their 7P had enough channels the originals remain Berg. In fact, the 7 channel limit was my only complaint. |
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| 04-25-2016 10:19 AM | ||
| stegl |
Re: Which Radio not to buy Nother Spek hit the dust , this last weekend but should be repairable. Not sure if it was brownout or what. Again when on the bench all seemed to work. I figure when no load on the servos the voltage is up there high enough to keep working. As Gary says it , if BEC's get overloaded and that brand doesn't like that. Part of the issue with cheap ESC/BEC's . I run up to 7 digital ( not all together) in several of my larger airplanes on 5 amp Castle ESC's and have never had an issue. But then then that radio system I am using has had the receiver tested down to 2 volts ( by the importer) and the receiver still keeps on chugging , thats less than half power voltage. Then there are ESC/bec manufacturers that make power claims and there are those that produce power claims. Quality stuff always come out on top. |
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