Lawmate receiver 1280 on channel A? B does not work - RC Groups
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Mar 01, 2012, 10:52 AM
RC FPVer
Discussion

Lawmate receiver 1280 on channel A? B does not work


I have been testing my video setup getting ready for my FPV build, and everything I've read so far seems to be different than my results for the switches on the lawmate.

I have a lawmate 1000mW 1.2 transmitter and the 1.2 8 channel lawmate receiver.

The Tx is set to channel 8 (1280) and the instructions show that channel 8 (1280) on the receiver is 1-7 dip switch up and 8 in the down position with the slide on channel B.

I tried this and got only fuzz. Eventually after trying many combinations I found it all works fine if I'm on channel A on the slider instead of B. But the instructions specifically say I need to be on B for 1280? How is this possible? is the switch backwards in the receiver?

I get perfect clear video on A with channel 8 switch down. But switch to B and nothing... just doesn't make sense to me. Am I misunderstanding something?
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Mar 02, 2012, 12:09 AM
RC FPVer
Update: The issue was fixed and due to incorrect positions of the 3 switches on the transmitter. I misread the graphic and thought that they needed to all be up, but was the opposite for 1280. Works as instructed now!
Last edited by surf1punk; Mar 04, 2012 at 03:26 PM.
Mar 02, 2012, 12:16 AM
Registered User
ashdec87's Avatar
I get confused by the dip switch settings. But if you found a combo that works, stick with it. You might actually be on channel 1
Mar 02, 2012, 01:17 AM
Beyond the BlackStump
Macattaka's Avatar
I have the LM 500mW 1.2 and had a similar issue, the channels don't appear to align. It's not near me to check at the moment but from memory the Tx is on Ch4 and the Rx is on Ch5. Ch4 on the Tx says 1100 but it actually tested as 1140'ish. I had to do the same as you and try random combo's until I got a clear picture.

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Last edited by Macattaka; Mar 02, 2012 at 01:24 AM.
Mar 02, 2012, 08:21 AM
RC FPVer
I just want to be sure I'm broadcasting at 1280mhz and not something lower since those other channels are illegal here in the US, and I don't have the tools to test it.
Mar 02, 2012, 09:17 AM
Registered User
If you get a hand in a scanner or contact any local ham, you'll have the confirmation you need
Mar 02, 2012, 10:55 AM
Registered User
Roel-CP's Avatar
i get worried now
Mar 02, 2012, 11:19 AM
NDw
NDw
Registered User
Is it the standard or portable reciever?
Mar 02, 2012, 11:59 AM
RC FPVer
Quote:
Originally Posted by NDw
Is it the standard or portable reciever?
It's this one from dronesvision

LawMate 1.2GHz Wireless AV Receiver VRx For FPV

http://www.dronesvision.com/lawmate-...-cctv-cameras/
Mar 02, 2012, 12:14 PM
NDw
NDw
Registered User
I have what looks to be the same one from rmrc and channel 8 is as described in the instuctions.

How do you know the tx is on 1280?
Mar 02, 2012, 01:11 PM
RC FPVer
Quote:
Originally Posted by NDw
I have what looks to be the same one from rmrc and channel 8 is as described in the instuctions.

How do you know the tx is on 1280?
Based off this image.



Mine is the same as what it says channel 8 is.
Mar 02, 2012, 01:29 PM
NDw
NDw
Registered User
I don't suppose you have any other 1.2 vrx?

You could buy one of these if you want to be sure.
Mar 02, 2012, 01:33 PM
RC FPVer
Quote:
Originally Posted by NDw
I don't suppose you have any other 1.2 vrx?

You could buy one of these if you want to be sure.
No, I don't, this is my first FPV build.

I found that same one earlier, just not sure I wanted to spend the $ on something I'll use once. I was just hoping someone else had the same thing happen etc. The feed works great, just not sure it is at 1280 on channel B like it is.

http://www.bestofferbuy.com/Handheld...aign=gbase_usa
Mar 02, 2012, 03:23 PM
Registered User
Mr.RC-CAM's Avatar
You didn't say which Lawmate Rx you have, which will affect the A/B switch usage. For 1280MHz, set the Rx's DIP SW-8 down (all others up), and then select the A/B switch position depending on the Lawmate Rx model, as follows:
RX-1260 (12V model): A/B Sw = B
RX-1280 (5V Portable model): A/B Sw = A

Regarding the Tx DIP switches, the dpcav.com drawing is correct. But maybe you are interpreting the positions in reverse? For example, on the drawing the *raised* tit portion of the DIP switch is shown as the black area of the switch figure. Please see below for a photo of that shows the TM121800's CH-8 settings.

BTW, if you reverse all the switches on the Tx, and are using a RX-1260 Rx, then your reported A/B switch issue will occur exactly as you have observed. If this is the case then you are on CH-1 (1080MHz).

- Thomas
Mar 02, 2012, 03:51 PM
RC FPVer
Quote:
Originally Posted by Mr.RC-CAM
You didn't say which Lawmate Rx you have, which will affect the A/B switch usage. For 1280MHz, set the Rx's DIP SW-8 down (all others up), and then select the A/B switch position depending on the Lawmate Rx model, as follows:
RX-1260 (12V model): A/B Sw = B
RX-1280 (5V Portable model): A/B Sw = A

Regarding the Tx DIP switches, the dpcav.com drawing is correct. But maybe you are interpreting the positions in reverse? For example, on the drawing the *raised* tit portion of the DIP switch is shown as the black area of the switch figure. Please see below for a photo of that shows the TM121800's CH-8 settings.

BTW, if you reverse all the switches on the Tx, and are using a RX-1260 Rx, then your reported A/B switch issue will occur exactly as you have observed. If this is the case then you are on CH-1 (1080MHz).

- Thomas
You know Thomas you may be correct about your last point. As I read the diagram that I linked for the Tx I thought the "white" was the switch, so all the switches are up instead of down. I will double check this when I get home.


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