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Old Nov 13, 2002, 04:41 AM
Takao Shimizu is offline
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Dual conversion PPM receiver schematic


This is my Rx for my plane.
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Old Nov 13, 2002, 06:03 AM
jandirks is offline
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Hi,

Interesting, any info on weight and building costs? Do you have a PCB for it?

Regards,

Jan-Dirk
Old Nov 13, 2002, 07:03 AM
Takao Shimizu is offline
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Jan-Dirk;

>Interesting, any info on weight and building costs?

Left one is dual conversion, Right one is direct(NOT Single) conversion Rx.

>Do you have a PCB for it?
Top Secrect as you see!?
Last edited by Takao Shimizu; Nov 13, 2002 at 08:07 PM.
Old Nov 14, 2002, 06:07 PM
Mr.RC-CAM is offline
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I like your use of the RSSI output to set the detect threshold of the decoded data. Is this something that you thought up on your own? This looks {to me} like a better way than the RC integrator method.

And speaking of the RSSI output, here is an idea for you. Extend the buffered output to a 2-pin connector. Now, when you are range testing at the field, just plug in your DVM or a custom LED bargraph display to accurately see the RF strength. Sure beats waiting for servos to glitch.

Regards,
Mr. RC-CAM
Old Nov 15, 2002, 02:44 AM
Takao Shimizu is offline
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Mr.RC-CAM,
>you thought up on your own?

Not my idea.
The slicer digital output has a lot of FM noise while no RF signal coming at this Rx. But, the shift register carry out all FM pulsed noise.
That is why I used 74164+pulse omittion circuit.
Last edited by Takao Shimizu; Nov 17, 2002 at 10:36 PM.
Old Nov 17, 2002, 12:13 AM
Mr.RC-CAM is offline
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Thanks for the additional info. Please keep us informed on your progress.

By the way, point "B" on the schematic is actually VCC. It belongs on the signal line going to U3 pin 1-2 (or so I believe).

Regards,
Mr. RC-CAM
Old Nov 17, 2002, 10:39 PM
Takao Shimizu is offline
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I edit it.


Thanks Mr.RC-CAM,
I edit the schematic.

Have you think about R17 delay circuit on my schematic, anyway?

Takao
Old Nov 17, 2002, 11:32 PM
Mr.RC-CAM is offline
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Quote:
Have you think about R17 delay circuit on my schematic, anyway?
I have seen that RC circuitry trickery on other R/C designs and it works well. Here is another home brew Rx that uses a variation of it:
http://home.nordnet.fr/~fthobois/anglais/rx17-b.htm

I was most interested in your use of the RSSI output to manage the signal offset voltage level. I think that is a wonderful idea.

Regards,
Mr. RC-CAM
Last edited by Mr.RC-CAM; Nov 17, 2002 at 11:35 PM.
Old Jan 07, 2012, 10:38 AM
mikeclair is offline
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Does anyone have a Schematic of a 3 or 4 channel receiver?


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