Response

Re: Any Advice On 40MHZ!

Hi Pete, "I am using 40MHz for my submarine. It is very good for sending a signal under water. 2.4GHz is not. This would suggest a fairly strong signal." The water penetration has very little to do with power. The main factor is the wavelength of the signal. Low frequencies, = longer wavelength, travel well through water, that's how whales can 'chat' over hundreds of miles 😉 Higher frequencies, = shorter wavelength, are mostly reflected from the surface back into the sky. What little penetrates the surface quickly dissipates it's energy by warming the water. Just like your which also works in the 2.4GHz frequency band. Ed; if you have a half decent 40Meg set the range will exceed how far we can properly see and control the model! My 40Meg set reaches the other side of the Ostpark Lake here in Munich, a good 200 meters, no problem at all. At that range I can just about see which way I'm steering😉 You do have to pull the telescopic antenna fully out though due to the longer wavelength of the signal. Also; DO NOT POINT THE ANTENNA AT THE MODEL!! The least part of the signal comes out of the end of the antenna. The strongest signal is radiated sideways (at a right angle) from the antenna. So hold the TX so that the antenna is vertical for the best range. Also fit the RX antenna in the boat so that as much as possible is vertical. I usually use the mast. Any antenna wire left over below deck can be coiled around a wooden dowel. This maintains the effective length to match the signal wavelength. DO NOT CUT THE ANTENNA WIRE!! If you can only fit the the RX antenna horizontally then hold the TX so that it's antenna is also horizontal. It's known as matching the Polarisation of the signal for the best received signal strength. Happy building😊 Cheers, Doug 😎

4 years ago by RNinMunich

Response

Re: Steampunk Pike.

Hi Martin, if they were food containers I very much doubt that they were ABS! Cos the three constituents are; Acrylonitrile (possibly carcinogenic to humans), Butadiene (carcinogenic to humans), and Styrene (suspected of being carcinogenic to humans.😮 Most food containers appear to be made of one of these- high / low density polyethylene (HDPE/LDPE), polyethylene terephthalate (PET/PETE), polypropylene (PP). PET/PETE you may also recognise from 3D printing. Depends a lot on which food is going into them. Main thing is that they won't react with the food and/or leach their binders etc into the food 😝 Especially if they get hot; e.g. in the ! Bon appétit Gents 😉

5 years ago by RNinMunich