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Posts posted by mklarich

  1. My story I repeat everytime someone thinks they need more and more power is that using a 15dB Omni I received video over 15 miles away from a full-scale airplane. The full scale had a 1 watt transmitter with a standard 2dB rubber duck antenna on it.

    The more power you put out, the more you multi-path, the more you interfere with yourself, the more you need my diversity receiver!


  2. Terry, I developed and marketed the first hobby diversity receiver over 2 years ago. I've been wanted to improve upon its design ever since, unfortunately personal issues kept me from being able to do that.

    About a year ago I came around and I was asking people what they wanted to see in a new design. Those ideas and a few more are what have been floating around and are now once again being compilied. These ideas are nothing new to me and I'm just trying to make sure I give the people what they want at a price that the average hobbyist can afford. If I want to make big money I'll beef the unit up, add more bling to it then you'll ever need and sell it to the government.

    My electronics business is a "Hobby" business for me, I work as an electrical engineer/circuit board designer all day at a scoreboard company so this isn't my primary income. I love AP and want to do my part to get other people interested, I know, sounds corny but it is true.


  3. I'd like to make it so it can run anywhere from 6v to 12-15V so that covers the 3S lipo setup. If I use a cheap linear regulator it just means I'll need a lot of heatsink for the regulator.

    The super duper cheap units receive sensitivity will be the same as the high end units, mostly the cost will go to features and expandibility. Would love to make it so you can have a main box that manages a couple 2.4ghz receivers as well as some 900 or 1.2ghz units.


  4. Hey boys and girls, I just got my butt back in gear on my new diversity receiver design this evening. I haven't touched diversity since I made my first design 3 years ago that I sold through BWAV. I'm back at it though. I've been itching to make a couple different designs with different features.

    Design 1: Super duper cheap

    -I want to make a unit that I can sell for $149-$179. I know, sounds a little low but it is do-able. Especially with the new airwave modules I am playing with. So many people start messing with aerial video and shy away because of interference problems. I want this to be like the cheap 4-channel FM transmitter you get with the screw together ARF from Towerhobbies. Its not good for anything but a trainer but if it gets you hooked and you come back and buy a 9 channel PCM radio a year down the road, it did its job.

    You buy it, use it and get hooked then advance from there.

    Design 2: Modular

    I thought about the universal, expandable, modular, stupendous diversity receiver last year. Its actually not to bad at all once you approach it from the right angle. I would love to make a unit that can take up to 4 units and another that could even take 8!! Impossible? Nah.

    Design 3: OSD

    -What all could we show on our video display with a quick, off the shelf OSD module? Shoot some GPS telemetry back down, always good. Which receiver is active and signal strengths of each receiver? Heck, there is all kinds of stuff there.

    Design 4: Any channel, anytime.

    -Found a 2.4ghz module that I can change the channel on anywhere between 2400 and 2480 mhz in 1 mhz steps. Therefore it would be a universal 2.4 video module, forget frequency set 1 & 2 & 20. It would do them all!


    I'll start with the super duper cheap model. My original design had a ton of hand building in it and after I sold it to Bill at BWAV and he took his cut the unit ended up costing a lot more then I wished it had. These new units should be super fast to build by hand especially with someone to CNC the cases for me. Next will be the modular.

    My big question is what frills and thrills do we really need?

    -Signal strength meter? (Overkill in my book, no plans for one on cheapy)

    -Active receiver LED (absolutely)

    -Channel indicator LEDs (maybe, maybe not. Depends on what switch I use for LEDs)

    -Speaker that chirps on receiver switch (maybe, it doesn't cost much)

    -Voltage range (theoretically the unit could run on 6 volts since everything inside is 5V. Definitly needs reverse polarity protection)

    -Screw mount (I had a tripod mounting screw in bottom of my first units, think it would be handy? Or are most people putting these things on the ground)

    We'll go from there, a production ready unit won't take long. The cases will be hand drilled for the first couple weeks until my CNC guy gets his stuff setup.

    Matt Klarich

    Klarich Electronics

  5. Boris, Matt Klarich of Klarich Electronics.

    This post is actually pretty old. The backstory is this. I starting selling the diversity receivers almost 2 years ago. I designed and hand-built the units, I then sold them to Bill Strong of BlackWidow A/V out in Colorado. He then resold the units.

    I ran into a issue which required my attention elsewhere so I couldn't fill the orders. Bill had a friend of his out in Colorado copy my design with a few modications. They made it so that it was mass-producable using contract manufacturers and began selling their unit a little less then a year ago.

    Now Bill has run into an issue at home that requires his attention. I don't know the status other then that. I have been working on a new design that is amazingly flexible and should have it to market in a couple months. It depends on the demand for the unit, I have a lot of projects and I have to decide where to concentrate my efforts.

    I'll try to keep people a little more up to date. Have a good one and happy flying!!

    Matthew Klarich


    Klarich Electronics

    m1klarich at klarichelectronics.com

  6. Just with a quick thought on it, if u don't want to get too fancy code wise and use PicBasic pro without INTs, you can just use a if.then loop with a set pause in it.

    ADC timing is set in Picbasic at the beginning of the program, I usually use 30-50uSec, more then enough. Get into a loop, check the a/d line, when the a/d gets over a certain value, pause, then check it again. When it changes back over, look back at your counter you have been incrementing every pause and you know your pulsewidth.

    I'm not an expert programmer and some would call that dirty programming but hey, it works :D


  7. What frequency spectrum are you thinking of doing this on?

    Also realize that diversity receivers aren't any more sensitive then regular video receivers for receiving the signal. Inside the magic diversity box is just a couple regular video receivers, the exact same receiver that most of you are using now. Trust me, I designed and hand built the first generation of Diversity Receivers that Blackwidow sold.

    Since 2.4ghz (the frequency of most video transmitters) is such a small wavelength, especaially compared to 72mhz (frequency of r/c controllers) that it is quite tempermental about being aligned correctly. 72Mhz is much more forgiving about being aligned correctly.

    End statement is this, you will NOT get any more range out of three 72MHz receivers, or even TEN 72Mhz receivers. You will just reduct the chance of interference due to multi-path interference.

    Matt Klarich

    Klarich Electronics


  8. Nice Video!!! I love seeing someone actually do aerobatics with camera on-board. Most people are still just happy to have the video working. Its getting time to do some real aerobatics while flying from onboard. Throw that in there with a video switch and you got my vote!! I don't what vote that is, but great video !!

    Matt Klarich

  9. I remember trying to do ATV on 440mhz and it knocked out my 72 mhz RC receiver. I had to make a bandpass filter for my RC receiver to eliminate RFI problems.

    How far are you trying to send telemetry? I have some good and very small 2.4ghz modems that are good for at least a mile and with a bigger antenna 2-3 miles.

    Matt Klarich

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