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Old Mar 03, 2011, 08:42 AM
First to go over 106K feet
Crist Rigotti's Avatar
USA, IA, North Liberty
Joined Mar 2008
2,479 Posts
Quote:
Originally Posted by bah7566 View Post
I've had the same issue. No idea why. Mine is a home made V on 900MHz.


Bruce
Who makes your transmitter?
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Old Mar 03, 2011, 10:18 AM
Cape Cod
tom3holer's Avatar
Cape Cod
Joined Sep 2010
889 Posts
An antenna that is not matched well will cause the Tx to run warm/hot. You can get a SMA dummy load that will plug into the Tx antenna slot. If the TX then under the same voltage runs cooler then it is indeed the antenna. Measuring the current draw will also be a good test but a bit more difficult.

Antennas are fickle. Using my wattmeter I found that on my Alex design "V" for 900mhz that just moving the coax at the base of the V changes the efficiency very noticeably. I did not realize how critical this was. Just as a note for 900mhz users. I tested 3 TX's of the cheap Chinese types rated at 500mw and all exceeded that output.

Tom
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Old Mar 03, 2011, 10:20 AM
Fly FPV, sleep; repeat
twinturbostang's Avatar
Germantown, MD
Joined Mar 2006
3,376 Posts
Quote:
Originally Posted by bah7566 View Post
I've had the same issue. No idea why. Mine is a home made V on 900MHz.

http://www.youtube.com/watch?v=y_LUAXuPqZI

Bruce
Bad connection or solder joint?
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Old Mar 03, 2011, 10:55 AM
Cape Cod
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Cape Cod
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Old Mar 03, 2011, 12:44 PM
FPV maniac
bah7566's Avatar
Colorado
Joined Sep 2007
587 Posts
Quote:
Originally Posted by Crist Rigotti View Post
Who makes your transmitter?
It's a 200mW from Range Video.

http://www.rangevideo.com/index.php?...roducts_id=138

Bruce
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Old Mar 03, 2011, 12:45 PM
FPV maniac
bah7566's Avatar
Colorado
Joined Sep 2007
587 Posts
Quote:
Originally Posted by twinturbostang View Post
Bad connection or solder joint?
Good thought but I checked all the solder connections and they were all good.

Bruce
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Old Mar 03, 2011, 01:49 PM
First to go over 106K feet
Crist Rigotti's Avatar
USA, IA, North Liberty
Joined Mar 2008
2,479 Posts
Quote:
Originally Posted by bah7566 View Post
It's a 200mW from Range Video.

http://www.rangevideo.com/index.php?...roducts_id=138

Bruce
Is Rangevideo using Lawmate transmitters?
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Old Mar 03, 2011, 02:30 PM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
28,488 Posts
Quote:
Originally Posted by Crist Rigotti View Post
Is Rangevideo using Lawmate transmitters?
No.

ian
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Old Mar 04, 2011, 04:57 AM
Epic Huckin'
paintball_kidz's Avatar
Surrey, BC
Joined Jun 2007
2,388 Posts
does the sunsky receiver use a sma or rp-sma connector?
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Old Mar 04, 2011, 06:47 AM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,410 Posts
Sunsky uses a standard SMA connector on the TX and an F connector on the RX.

-Alex
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Old Mar 04, 2011, 06:27 PM
Registered User
Croatia
Joined Dec 2010
137 Posts
Hello everyone.
I got LM 1.2 1w Tx/Rx, so I try to find the optimal frequency for the video signal. For now, while testing, everything works perfectly (for testing on the bench I have a cooling fan dont worry) Now channels are configured as shown in these pictures:
I do not know what channel it is. According to the Tx it is 8th channel(all three dip switches are the right of the numbers 1 2 3) , but the RX can not be 8 channel because the AB switch in position for channels 1-4, or not?
I know this is already explained somewhere but no matter what I've read a lot of posts still do not understand in what position should be dip switches for certain channels. Can someone explain to me how to set dip switches for different channels.
Thanks
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Old Mar 04, 2011, 07:15 PM
Why is the Rum gone?
sim_io's Avatar
USA, GA, Savannah
Joined Mar 2008
1,668 Posts
Quote:
Originally Posted by bah7566 View Post
I've had the same issue. No idea why. Mine is a home made V on 900MHz.

http://www.youtube.com/watch?v=y_LUAXuPqZI

Bruce
That's crazy you too!

My friend made a home V.
I looked at it close and it has a lot of solder and one pole wire is longer than the other by a small difference.

Funny, he uses the rubber ducky and it goes straight to video but he has to touch the G spot on the V with his finger for things to happen
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Old Mar 06, 2011, 01:13 PM
Now which way was home.....
Joined Feb 2011
115 Posts
Sunsky 1.2ghz 800mw

ch1) 0.910
ch2) 0.980
ch3) 1.010
ch4) 1.040
ch5) 1.080
ch6) 1.120
ch7) 1.160
ch8) 1.200
ch9) 1.240
ch10) 1.280
ch11) 1.320
ch12) 1.360
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Last edited by FPVORDIE; Mar 06, 2011 at 02:22 PM.
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Old Mar 06, 2011, 03:04 PM
Why is the Rum gone?
sim_io's Avatar
USA, GA, Savannah
Joined Mar 2008
1,668 Posts
How much more sensitive is the black lawmate receiver compared to the sunsky (FOX?) is it like -95dbi?
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Old Mar 07, 2011, 06:53 AM
Registered User
Luxembourg
Joined May 2009
794 Posts
Difficult to say. It's more the assurance to have a good quality receiver with the saw filter mod already done.

Some Fox receivers are poorly made and give crappy results. But a good Fox Rx with saw filter mod will give the same results.

One drawback of the Lawmate Rx: not compatible with the latest IBcrazys antennas
One advantage of the lawmate: small and sma plug.
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