Predictably, more and more RC-manufacturers are introducing "crystal-less" 2.4 GHz remote control systems.
Spektrum has come out with a new 7-channel system called the DX7. It's not on their website yet, but Horizon hobby has it for sale. This one is supposed to be a radio for 'real' models, not only meant for park-flyers like the DX6. I wonder if there will be a problem with 'CE' approval with regards to the output power - A rumor I heard was that the 'CE' marked version of the DX6 has a reduced output power compared to the US model ??
There's also a new player on the market, Xtreme Power Systems, which will introduce their new xtremelink module+rx combo shortly. They too promise increased range and reliability. In contrast to Spektrum, who talk about either 40 or 80 simultaneous working modules, Xtremelink claims up to 390 000 simultaneous active modules ! Also, up to 1 mile ground based range. Pricing and deliverytime still open.
The Futaba modules I noticed back in January were on display at Model Expo in the spring but the local agent said it would take some time before they come to market. I've detected no activity in the Futaba camp so far...
For the new boat, I've bought myself a DX6. Naturally I'm going to mod it a bit before use ;). I've ordered a switched-mode regulator which supposedly will reduce the current drain of the Tx a lot. Also, I've gotten very used to the 'no antenna' look and feel of the Futaba 3VCS with a Spektrum module (especially usefull when it rains, the whole radio goes inside the Tx-cover, no leaking hole for antenna needed). But the stock DX6 has an antenna that sticks out :(. Cell-phones have had internal antennas for years and nobody buys phones with external antennas anymore - so the DX6 antenna needs to go inside the case too ! I'll report later how that goes...
By popular demand, here are the schematics and pcb layouts for the optoisolator cards I made for use with the Mesa Electronics 5i20 servocard.
Continue reading Optoisolator cards for Mesa 5i20 servocard
Curing epoxy mouldings typically requires elevated temperatures (+ 40Â to 70 C) for 4-12 h. Previously we have done this in a cardboard box with a car-heater continuously blowing hot air into the box. By adjusting the number and size of holes in the box the temperature can be crudely varied.
Here's an attempt to create a better heater with temperature control.
Temperature controller with display and input buttons on the left. White temperature sensor in the middle. 200 W heater-blower box on the right.
Continue reading Temp controller for curing box
One of the most exciting things for a while now in the R/C world has been the 'no crystall' radios operating on 2.4 GHz from both Nomadio and Spektrum
Now it appears that the big players are entering the game. These pics of an upcoming Futaba product were just posted to the IOMICA forum:
The Rx on theÂ right supposedly has two internal antennas (no wire antenna exiting the Rx) and weighs only 14g !
These images were found at
but otherwise there seems to be very little information available...
If anyone knows more about this system please post a comment below !
This is the modified Spektrum receiver I have been using with my Futaba 3VCS this season.
Continue reading Spektrum Receiver Antenna Modification
The DSM system by Spektrum RC (www.spektrumrc.com) is a new and exciting development.
I got my RF-module and receiver ahead of the radio that I have also ordered so I have time to inspect the DSM parts before trying them out...
Continue reading Inside the DSM system
The best thing since sliced bread ! A digital PVR really transforms the way in which you use your TV. If you have digital TV but don't own one of these yet then you are missing out big time !
Boxes with twin tuners for the terrestial network DVB-T were available for some time in Finland but it was only in the spring of 2005 when twin tuner DVB-C boxes became available. The Topfield 5100 was one of the first products on the market - and naturally I had to have it.
The functionality of the topfield can be extended with your own programs and there are large user communities at least in Australia, UK, and Germany.
Here I have taken a look inside the box and tried to describe the hardware. Some of the wilder hackers think it should be possible to run an entirely opensource software(VDR) on the box...