comtech module i²c protocol

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on4bhm
Posts: 79
Joined: Mon Oct 24, 2011 5:52 pm

comtech module i²c protocol

Post by on4bhm » Fri Feb 07, 2014 3:36 pm

Hi,

Does someone have the description of the i²c protocol for the comtech modules?
I need to write some code to set the frequency...

Any help?
thanks

M0DTS
Posts: 443
Joined: Sun Feb 24, 2008 9:03 pm

Re: comtech module i²c protocol

Post by M0DTS » Fri Feb 07, 2014 4:52 pm

http://f6csx.free.fr/ATV/comtech/PILOTAGE_COMTECH.htm

It's picbasic but should help a bit.

73
Rob

on4bhm
Posts: 79
Joined: Mon Oct 24, 2011 5:52 pm

Re: comtech module i²c protocol

Post by on4bhm » Fri Feb 07, 2014 6:26 pm

My idea is to make a atv scanner with comtech rx module.
Our atv relay has 3 inputs on 13cm: 2330,2360 and 2390 Mhz
(-900 for downconverter: that makes 1430,1460,1490 Mhz L-band down)
Now there are 3 analogue sat receivers 24/7 qrv.
This takes away a lot of power (24/7 365d)

What i want to do is scan the 3 freq's. if there is signal on one of them. switch on the correct receiver... for a certain time
I detect signal with the s-meter output of the comtech module.

So the comtech module will not be used for its video output... but rather just for the signal detect...

I hope this will save me on power usage...

73's
on4bhm
sysop on0snw

on4bhm
Posts: 79
Joined: Mon Oct 24, 2011 5:52 pm

Re: comtech module i²c protocol

Post by on4bhm » Fri Feb 07, 2014 6:26 pm

My idea is to make a atv scanner with comtech rx module.
Our atv relay has 3 inputs on 13cm: 2330,2360 and 2390 Mhz
(-900 for downconverter: that makes 1430,1460,1490 Mhz L-band down)
Now there are 3 analogue sat receivers 24/7 qrv.
This takes away a lot of power (24/7 365d)

What i want to do is scan the 3 freq's. if there is signal on one of them. switch on the correct receiver... for a certain time
I detect signal with the s-meter output of the comtech module.

So the comtech module will not be used for its video output... but rather just for the signal detect...

I hope this will save me on power usage...

73's
on4bhm
sysop on0snw

OA5ATV
Posts: 14
Joined: Mon Apr 09, 2012 12:03 am

Re: comtech module i²c protocol

Post by OA5ATV » Sun Feb 09, 2014 11:31 pm

I think it's easy to do, you just need a uC pic like 16f628, which sends the command to comtech i2c module, which receives a certain time (eg 10 seconds) one of the three channels, and takes 10 seconds, routine checks the level of a digital input, if it is high, then a digital logic one to the corresponding receiver for a period of time, the output s-meter module should be connected previus to a comparator opamp output is activated, to discriminate the noise.
Josue

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