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Ghz radios? How do you get signal to a sub?! - RC Groups
multiple communications protocols, in the band of GHz and GHz, is presented in this paper. .. of penetration denoted by δ is inversely proportional to the square root of the frequency, so it reduces while frequencies of more than KHz, propagation of EM waves in Earth land and sea-water is lossy. Even for VLF. that a Zigbee transceiver, operating in the GHz band, can communicate with low error rates up to 40mm at low RF power. (dBm) and up to 70mm at higher power (-3 dBm) in seawater. Ranges are slightly higher in fresh However, there is no penetrating electrical connection between the two halves of the coupling. Low-frequency radio waves (AM/FM radio) travel easily through brick and stone and VLF (Very Low Frequency) even penetrates sea-water. As the frequency rises, absorption effects become more important. However this is significant in practical life only in 50 GHz and above. So AFAIK a Ghz would not.
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Navigate Blogs Classifieds Places Search. Remember Me Forgot Password? Boats Submarines Discussion 2. How do you get signal to a sub?! Jan 20, I'm one of those migrants from the heli forums. Please don't throw rocks! I have a sort of This is going to basically be a sort of underwater inspection unit, with remote video capabilities. What I'm wondering is what kind of radios you guys use and what the range is for them. I'd like to go wireless but I'm not sure if its going to be all that feasable.
Does the air to water transition kill the signal distance? Do a search around this forum as your question has been asked often. As you will soon find, lower frequency the better, so 2. Most of the normal boat radios dont have computerization and are overpriced. I have used them all for years now and fly helis 2.4ghz penetration of sea water but subs and ROVs are my pastion. Just 2.4ghz penetration of sea water one very important fact,the chemical make up of the water is critical for radio transmition,the more clorine,sulfur,iron ect the worse and especialy salt ,never run in the ocean or brackish water unless you dont intend on going below the length of an extendid reciever antena!
It will not recieve signal. PCM works very well with the abundant failsafe capabilities,my favorite and well tested format ,rock solid underwater reception. Dave, This is very useful information for me.
Generally, what kind of range do you get? Is a lot of the loss due to refraction from the water? Could I drop a radio lead into the water to increase reception? Thanks for all the help so far. This is greatly influencing my ideas about how to go about completing my task. Great, No an antena in the water makes no diference the salt in the ocean is just to abundant for these radios,you would need a 2.4ghz penetration of sea water control and vedeo system just like ROVs have they have spent millons trying to do the above wirrelesly and not even the military as far as I know have a reliable system Now in fresh water no problem water I get about 25 ft in the spring waters here in Florida the cleanest water in the world ,I can go all the way down in Gennie Springs and still have control about 25 ft.
I have not gone deeper except in Lake Tahuo about 65 ft! Needles to say the sub did not implode I still have her,my first. Refraction ,water quality and 2.4ghz penetration of sea water strenght and type all make a huge difference in RC Subs. Dave Amur Ship yard. Images View all Images in thread.
I can see the shortcomings of radio signals the depths. I am wondering if perhaps an infrared or ultrasonic 2.4ghz penetration of sea water might work. Clearly beyond my capabilities, but interesting to ponder.
The response time would probably be pretty bad. We'll have to
2.4ghz penetration of sea water with a teathered setup for sure. Sending wireless video would probably prove difficult as well. Jan 21, Correct the vedeo signal does not penetrate the water ,salt or fresh. The receiver has the aerial removed and a wire inside the umbilical cable attached that ends on the surface with a normal aerial soldered on the end.
This has been good to 60 meters in sea water for me. Basically you are extending the receiver aerial. I have no idea if your radio would work in this application.
it should work fine will try it! Thank you I forgot that cars use the 2.4ghz penetration of sea water. Jan 22, Hi Rhetor, I had to laugh when reading your thread, I am also a heli guy, I have been doing some aerial photography with my helis, and the next thing I'm looking at doing making up a rc sub with onboard camera.
I would propose the only way to do
2.4ghz penetration of sea water would be to have the receiver aerials both control and video downlink run from a buoy that the sub is tethered to. Could you share you design? I would be pretty interested to see how others have approached the problem. I have a local hobby shop selling the Thunder Tiger "yellow" subs, I was going to run one of those, minus the body, with thrusters retrofitted for maneuverability.
Hi Ben, I don't think I can post my design, but I may be able to post pictures when it is completed. The floating buoy was an idea we had, we are wondering whether or not to just switch to a full teathered system though. I think I would prefer the buoy. Hi Rhetor, With a static diving sub you can always do with an emergency flotation.
I was going to make the tether retractable because A less cable drifting around getting caught on things and B I may perhaps be feeling too lazy to pull the sub up in the event of a failure. I was thinking of using high capacity fishing line with the aerials bundled with it. Posting Quick Reply - Please Wait. Sign up now to remove ads between posts. Originally Posted by aquadeep Thats right 2. Show Attachments in this Thread. How do you get your money back from?
Sep 22, Airliner nose and cockpit profiles-how do you 2.4ghz penetration of sea water it perfect? Nov 30, How do you get the pins out of the Hornet? Sep 28, How do you get out of the seven cell trap? May 20,
Navigate Blogs Classifieds Places Search. Remember Me Forgot Password? Boats Submarines Discussion 2. How do you get signal to a sub?! Jan 20, , I'm one of those migrants from the heli forums. Please don't throw rocks! I have a sort of This is going to basically be a sort of underwater inspection unit, with remote video capabilities. What I'm wondering is what kind of radios you guys use and what the range is for them.
I'd like to go wireless but I'm not sure if its going to be all that feasable.
The intricacies presented by the underwater environment are a long way away more compared to the terrestrial environment. The set up reason for such intricacies are the physical characteristics of the underwater surrounding that have a effectively impact on electromagnetic EM signals. Acoustics signals are by far the highest preferred choice for flooded wireless communication.
Because exorbitant frequency signals have the luxury of large bandwidth BW at shorter distances, high frequency EM signals cannot penetrate and raise deep in underwater environments. The EM properties of water tend to deny their propagation and movement severe attenuation.
Accordingly, at hand are two questions with the purpose of need to be addressed for underwater environment, essential what happens when upraised frequency EM signals functional at 2. To statement these questions, we up real-time experiments conducted by the side of 2. The obtained results helped in studying the physical characteristics i. It is observed that intoxication frequency EM signals be able to propagate in fresh fizzy water be illogical at a shallow astuteness only and can be considered for a clear-cut class of applications such as water sports.
Besides, path loss, velocity of propagation, absorption loss afterwards the rate of signify loss in different flooded environments are also intended and presented in succession to understand why EM signals cannot propagate concerning sea water and pelagic water environments. An most select solk6ution for underwater letter in terms of reporting distance, bandwidth and spirit of communication is presented, along with possible flooded applications of UWSNs by 2. Underwater Wireless Antenna Networks UWSNs are comprised of a sensor or else a group of sensors that are deployed indoors water to sense along with explore the deep sub aqua environments [ 1 ].
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- 16 Jun Because high frequency signals have the luxury of large bandwidth (BW) at shorter distances, high frequency EM signals cannot penetrate and propagate deep in To answer these questions, we present real-time experiments conducted at GHz in terrestrial and underwater (fresh water) environments. 7 Jan This will depend on the properties of the water but I recall calculating for sea water that you'd lose it after a few inches. What you need is a measure of the in " water, fat and protein molecule " & near GHz, but the RF radiation does not stop at the surface & can penetrate from a few to several cm.
- How deep underwater can Bluetooth reliably transmit? - Electrical Engineering Stack Exchange
- that a Zigbee transceiver, operating in the GHz band, can communicate with low error rates up to 40mm at low RF power. (dBm) and up to 70mm at higher power (-3 dBm) in seawater. Ranges are slightly higher in fresh However, there is no penetrating electrical connection between the two halves of the coupling.
- Therefore the radio wave under sea water communication is restricted to very low frequency waves with very small band width and consequently very low data rates. Newly, short The penetration depth of radio waves through a conductor is determined by the skin depth. . Are you totally constrained to use a GHz link?.
Likes the company, not into relationship?18 Oct I know that Bluetooth operating at the standard GHz has a hard time penetrating water (I guess the water "absorbs" the signal). However, at what depth does this really start? In my case I am thinking about a device that operates within 1 meter of the surface and would transmit to someone nearby on land. Penetration at these frequencies is better in fresh water - a lake or swimming pool , and difficult to impossible in sea water. Modern radio control sets using the Ghz band penetrate water very badly, and are of no use to a model submariner who wishes to dive. For underwater radio to work, even at these frequencies, the ..
2.4ghz penetration of sea waterdifferent environments Terrestrial and Underwater. This shows that 2.4ghz penetration of sea water the signal propagates in an indoor environment, it degrades with the order of 1.
2.4ghz penetration of sea waterpost for details.
A Radio-controlled submarine is a scale model of a submarine that can be steered via radio control. The most common form are those operated by hobbyists. These can range from inexpensive toys to complex projects involving sophisticated electronics. Oceanographers and the Military also operate radio-controlled submarines. As the conductivity of a medium increases, the more a radio signal passing through it is attenuated.
As is well known communication with military submarines uses very low frequency electromagnetic radiation for this reason. Penetration at these frequencies is better in fresh water - a lake or swimming pool, and difficult to impossible in sea water. Modern radio control sets using the 2.
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2.4ghz penetration of sea watercharacterizes path loss in different environments is called Path Loss Exponent. Figure 5 is the bar graph of data illustrating the RSS measured at each distance. These systems are differentiated on the basis of the carrier frequency, bandwidth, transmission distance and nature of communication in underwater. That is why now doctors use pills with flash memory.
2.4ghz penetration of sea waterfor UW communication and have used the Very Low Frequency VLF band of the electromagnetic spectrum as it does not suffer more attenuation as compared to other higher frequencies. In addition, from the results of absorption losses for 2. Clearly beyond my capabilities, but interesting to ponder. Jan 22,
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