Espritmodel.com Telemetry Radio
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Old May 04, 2011, 11:25 AM
Awsome 2.5D Pilot.
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Foxfire Village, NC
Joined Nov 2003
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Here's the answer to mounting the antenna.
http://www.xtremepowersystems.net/pr...S-24Ant&cat=12
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Old May 04, 2011, 11:09 PM
Space Cowboy
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United States, CA, Vandenberg Air Force Base
Joined Jan 2007
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Just got done with setting up my DM8.

I was able to get the entire thing setup without ever breaking open the A9 or the DM8.

Here are pictures and some instructions that helped me.

I purchased all my stuff at the local Radio Shack using parts listed here:
  • NPN Transistor, Part Num: MPSS222A
  • Resistor, 4.7k 1/4 watt 5%(in place of the of the schematic 6.2k)
  • Resistor, 22k 1/4 watt 5%(in place of the schematic 13k)
Total cost $3

Those were the parts I purchased, I used some old PC board to help build the parts, then soldered them all together and then put some heat shrink over the build.

I decided to use a standard receiver connector for the connection into the radio.



Read the other posts on the A9 pinouts, but if you want there are 5 pins, labeled from left to right:
1 2 3
PPM PWR GND

I then used an old computer connector male pins and pushed that into the module and that is labeled as such:

With the DM8 module connector side facing you, and the connector facing on the top, from left to right,
Far right = pin #5 = PPM
Pin #4 = Pwr
(skip pin #3)
Pin #2 = GND
Pin #1 (not used for this)

I then made a replica of the module with a epp type foam that is super strong (from a computer box) and then cut it to fit, and then double stick taped it to the back of the module.

It slides into the back of the radio without a problem to swap modules!


Once that is done, setup a new model on your A9 and make sure you pick modulation PPM/P and your good to go!

everything works like a charm! Time to sell the DX6i

Cost of the DM8 -- $45
Cost of Parts to make it work with the A9 - $3
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Old May 04, 2011, 11:10 PM
Space Cowboy
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United States, CA, Vandenberg Air Force Base
Joined Jan 2007
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Quote:
Originally Posted by bigbobed View Post
Here's the answer to mounting the antenna.
http://www.xtremepowersystems.net/pr...S-24Ant&cat=12
I need to get me one of those, to make this setup even sweeter!
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Old May 05, 2011, 02:55 AM
most exalted one
BC Canada
Joined Aug 2002
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Was using that on a DM8 Futaba 9C combo for about a year. The antenna was great. You can actually get one at some other sites for about $2.02 shipped. I believe 2db is OK.
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Last edited by 4*60; Sep 13, 2011 at 02:47 AM.
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Old May 05, 2011, 07:19 AM
Registered User
USA, NY, Jamestown
Joined Jun 2000
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ShoGinn- thanks for the additional information, instructions and pictures. Its very helpful.

4*60- if you remember where to get the antenna at that price please let us know. It does look better and should be easier to change out modules without the wire and remote antenna.
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Old May 05, 2011, 04:10 PM
"Simplify, then add lightness"
Raleigh,NC
Joined Nov 2000
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You can order them off ebay from Hong Kong for about $1.25 http://cgi.ebay.com/2dbi-Wireless-2-...item3f098600bf

If you search ebay you may find some shipped from the US for a little more.

Any 2.4 GHz antenna with a RP-SMA connector should work. The higher the gain(ie higher dB) the more directional the antenna will be. The radiation pattern of a rubber duckie is roughly a donut shape around the antenna with little signal coming off the end so don't point the antenna at the receiver. The higher gain versions basically squash the donut so it is more important to have the antenna perpendicular to the receiver.

PS Antenna I use came from an old dead WiFi router, many of which use RP-SMA antennas.
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Old May 05, 2011, 04:24 PM
Space Cowboy
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Great info Jeff!
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Old May 08, 2011, 03:33 AM
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Manila, Philippines
Joined Jul 2004
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Here is the Aurora Modules for JR.....its very clean, no more dangling Antenna wire.
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Old May 08, 2011, 03:58 AM
Registered User
USA, NY, Jamestown
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Quote:
Originally Posted by jeffs555 View Post
You can order them off ebay from Hong Kong for about $1.25 http://cgi.ebay.com/2dbi-Wireless-2-...item3f098600bf

If you search ebay you may find some shipped from the US for a little more.

Any 2.4 GHz antenna with a RP-SMA connector should work. The higher the gain(ie higher dB) the more directional the antenna will be. The radiation pattern of a rubber duckie is roughly a donut shape around the antenna with little signal coming off the end so don't point the antenna at the receiver. The higher gain versions basically squash the donut so it is more important to have the antenna perpendicular to the receiver.

PS Antenna I use came from an old dead WiFi router, many of which use RP-SMA antennas.
So Jeff, higher gain is a bad thing or a good thing? Is 2 dbi considered high gain? Sorry, I know nothing about this stuff.

PS-FWIW- I did look on XPS's web site and the replacement antenna they sell is 2.1dbi.
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Old May 08, 2011, 09:24 AM
Space Cowboy
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United States, CA, Vandenberg Air Force Base
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I got mine on Amazon, waiting on it to arrive so I can run range checks.

http://www.amazon.com/gp/product/B004BLRMP0
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Old May 08, 2011, 11:08 PM
"Simplify, then add lightness"
Raleigh,NC
Joined Nov 2000
2,701 Posts
Quote:
So Jeff, higher gain is a bad thing or a good thing? Is 2 dbi considered high gain? Sorry, I know nothing about this stuff.
I think the standard antenna on most 2.4GHz RC transmitters is around 2 or 3 dbi so no it wouldn't be considered high gain. Higher gain is not necessarily a bad thing, it just means you need to take more care in orienting the transmitter antenna in relation to the model. If you don't need the extra range, then better to stick with a 2-3 dbi antenna.

Gain is achieved in an antenna by taking the transmitter power and concentrating it in certain directions instead of spreading it all around equally. Here is a good explanation which also shows radiation patterns for some typical rubber ducky antennas. http://www.rcexplorer.se/page14/gain/gain.html
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Old May 09, 2011, 05:09 PM
Space Cowboy
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I just received that Antenna I mentioned in the post above, took about 3 days shipping not bad!

Screwed it in and did a range check with no problems! Sweet setup now.
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Old May 18, 2011, 02:39 AM
Welcome to the Wind
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United States, CA, San Jose
Joined Jan 2008
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i still need a little help the npn has 3 prongs on it ,,how are they connected i did a drawing is this correct ..i dont have the npn just a picture of one that im going off...
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Old May 18, 2011, 07:54 AM
Space Cowboy
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United States, CA, Vandenberg Air Force Base
Joined Jan 2007
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o2bergn, what you are describing is a typical transistor understanding error.

the 3 wires coming from the transistor each has a different name.


now if you look at your picture you did not draw it as a schematic just as a drawing.
look at the one drawn up earlier in the posts.



if you look at the transistor you see the flat line parallel to the A9 on the left hand side of the image? reference that along with the arrow on the bottom right of the transistor. it is exactly like the image i posted.

The B C E = base collector emitter.

now look at the actual transistor.



hope that makes more sense or confused you more
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Old May 18, 2011, 12:45 PM
Welcome to the Wind
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United States, CA, San Jose
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i think i got it ,,im very bad at electrical,,,,
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