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Old Jun 11, 2010, 11:37 AM
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Cralis,

Can you do that - connect it and measure it at the pin where it goes into the DOSD+, or at least on that side of the 100k resistor. Have the OSD powered up while measuring this.

Daniel
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Old Jun 11, 2010, 07:01 PM
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I'd love to, Daniel... But.. not sure where to touch the positive probe. Can you tell me, and I'll give it a bash.
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Old Jun 11, 2010, 08:40 PM
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Daniel... as an electronics novice... I am scared to put probs too close to things ont he board... scared of the 'magic smoke'. Is there anyway the diagnostics screen could show the voltage being read on the RSSI port?
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Old Jun 11, 2010, 09:54 PM
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Cralis,

As a matter of fact there is. Just set the OSD mode to 3 and see what "voltage3" says.

Daniel
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Old Jun 11, 2010, 09:55 PM
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OK, checking now...
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Old Jun 11, 2010, 10:43 PM
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30 minutes..

DragonOSD+ RSSI diagnostics (3 min 37 sec)
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Old Jun 11, 2010, 11:29 PM
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Cralis,

It looks like the RSSI voltage after the 100k is too low. You may need an RSSI buffer.

Daniel
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Old Jun 11, 2010, 11:30 PM
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Ah no! I thought the resistor I added (100K Ohm) WAS the buffer.
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Old Jun 11, 2010, 11:32 PM
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No - that's just a resistor. Thomas's early receivers did not include a buffer and did not do well on the RSSI output front as a result.

Daniel
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Old Jun 11, 2010, 11:40 PM
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Ok... are they easy to make, or would this be my only options? Not even sure it will work with the DOSD+ though...

Says:
Operating Voltage: 5VDC (powered by EagleTree eLogger).

So, I guess I need all pins off the DOSD+ to this device. Ahh.. this isn't good news.
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Old Jun 11, 2010, 11:46 PM
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Hi guys, looks like voltage 3 is for RSSI, is that right? It's going from 0.07v to 0.03v, I would ask on the tlrs thread what the RSSI voltage should be out of the reciever, even before you connected to the dosd+ it looked low to me.

Daniel, does the gain channel work with gps stabilization if I have auto-stabilization set to zero and gps-stabilization set at, say 4.00 if I launch with the gain switch "off" when I turn it on it should hold heading, is that right?

Thanks

Mark
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Old Jun 11, 2010, 11:52 PM
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Mark, this is the info I have:

http://www.rcgroups.com/forums/showp...&postcount=377

But it sounds like a strange dialect of Greek to me...

When I measure with my volt meter, I get 0.89 when the Tx is on, and 0.44 when it goes off - which matches another guy who runs the Ramzibi.. Razibi... Bizira... what ever... another OSD.

It also kinda matches what THomas says:

"it is normal the off voltage is about 0.5V
and the on voltage is about 1.0V"
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Old Jun 11, 2010, 11:57 PM
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Quote:
Originally Posted by Cralis View Post
Mark, this is the info I have:

http://www.rcgroups.com/forums/showp...&postcount=377

But it sounds like a strange dialect of Greek to me...

When I measure with my volt meter, I get 0.89 when the Tx is on, and 0.44 when it goes off - which matches another guy who runs the Ramzibi.. Razibi... Bizira... what ever... another OSD.

It also kinda matches what THomas says:

"it is normal the off voltage is about 0.5V
and the on voltage is about 1.0V"
I think yours is right then, looks like you will have to buy the one, or your could make your own for a dollar. Do a search for rssi buffer, very simple to make.
Mark
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Old Jun 12, 2010, 12:18 AM
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mark,

The gain channel works on both the IMU and GPS stabilizations. Where they are independent are the individual gain controls in the menu. So you can still use the gain control channel to test it.

Cralis,

"voltage3" is what you need to be looking at - this was mentioned in post #1654 above as well - you might have missed that.

Why don't you try a different resistor value - say 47k or something.

Daniel
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Old Jun 12, 2010, 12:29 AM
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Thanks Daniel. I will try a 47K one. Will take a drive and find a shop that sells them. Do you think that would work, or should I just cut my losses and get that ET buffer? It;s both a space and a cost issue though, My wife is gonna kill me if I have to pay more for this damn plane! ehhe.. And space is an issue too..

If you think there's an average chance of a 47K working, I'll go get one now.
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