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noall

Increasing 72MHZ range

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OK I have just found this forumn and am in some need for some help. I may be of help to others as well. I have a few rc tanks and I have some wireless cameras in them.... first thing. I need more range from my existing rc transmitter. does anyone know how to modify or and to it. to increase distance. schematics. different antenna. longer shorter. etc anything that will help increase distance.

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I have experimented with several cameras and found the spy version to be good but distance was sh*t. so i bought a 1 watt video amp nd it kicks ass. now i can see the picture at great distances but the tank stops working once i get so far away. anything out there that can increase the transmitter distance??? please help... this is a great forum by the way....

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For one thing, it's illegal to modify an RC Tx or add an amplifier. A directional antenna could be made for it but would be quite large, but I don't know whether even that would be legal.

You could get a Ham license & use the 6 meter band (50mhz) and experiment to your hearts content.

Not much help here. Maybe someone else will chime in.

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For USA use, since your app is ground based, I suppose you meant 75 MHz instead of 72 MHz. So, you're probably using the stock/short antenna on the 75 MHz R/C Rx. Try something much longer, perhaps 38 inches.

However, if your video Tx is the cause of the short R/C range then that is different ball of wax to deal with.

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I'm suprised to hear that your land based 2.4ghz video setup has better range than your 75mhz RC controller.

Maybe your receiver lacks sensativity. You might consider a better double conversion receiver and a longer antenna as Mr. RC-Cam suggested.

Perhaps your equipment was only intended for close range and an upgrade is needed. Unfortunately I'm only familiar with the RC plane stuff.

-Dave

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Ok guys . This is awesome I got so many responses on this already. But heres the deal. I had a rc plane. it crashed hard several times so . thats what I am using in a ground unit(aka the tank) it is 72 MHZ. its a decent unit...futaba....(also I am in england and i know its illagal but i dont care. anyway) I need more distance...theres 2 things I am talking about. 1 is the transmision of the stock 72 mhz rc transmitter - receiver.......

2 the old-new video system i have in it. (anyone c the pic i posted????? if so let me know if not let me know..???

1 the stock transmitter i know can be modified some how or an amplifier can be added to get more gain for distance....

2 the original wireless video cam was not even good enough to get the same range as the stock transmitter. c video on my .mac account..... noall666 (if you dont know how to gain access to a .mac account public folder. google that sh*t)

so I got a video amplifier from japan that is 1 watt and kicks ass. now the video can go farther than the transmitter.

the original was a 2.4 ghz generic video spy came( http://www.dynaspy.com/product_info.php?pr...FRsRagod1WzsLQ) But I upgraded to a 1 watt set up I found in japan. its using the same camera but a 1 watt amp to boost signal. . The original video camera set up was crud. see video....

so in final.

I need to know (someone must have some ideas or knowledge on this) How can I get more gain out of my transmitter.

side note. I work in the entertainment industry as an engineer for rock bands. I deal with rf for in ear monitors everyday. we deal with 500 to 700 MHZ range with real nice amplifiers . ( output amplifier combiners. check this out... http://www.directproaudio.com/product.cfm?directid=59898 )( I have even seen 1 watt amps made, which are illegal but when they are needed we use them, like when a video wall or too many lights give off to much interferance....) Also . If you look at the pic. I am also installing a second camera in the small hole next to the barrel. even more sweet.......

BUT I dont know any schematics or amplifier systems that can do 72 MHZ .

So I need your guys help!!! we can do this.... this will help all of us get more distance and better our devices for better fun....lets do this guys.....any help will be greatly apppreciated.... I will look into any ideas ....

Edited by noall

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OK.

Firstly, what are the distances you achieve with the R/C if the video TX is on, and when it is off? A 1W transmitter right next to the R/C receiver, which must be the case due to the size of the tank, will usually seriously reduce R/C range, and you can't do much about it if you can't physically separate.

I recall seeing someone on RCGroups who made a 72MHz amp for his R/C, but you usually won't find a commercial offer so it's DiY needed. But blasting more power won't even help much if there's not a minimum work done on the RX side.

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