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Old Jul 29, 2012, 05:22 AM
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Australia, NT, Lyons
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Originally Posted by voyager4 View Post
Have tried the easy diversity with two bevrc RC302 2.4ghz but that didn't work. Bevrc let me know that the RC302 have no pin with rssi
Search around. I'm pretty sure I have seen a hack to get RSSI of the board.
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Old Jul 29, 2012, 05:24 AM
voyager4
The Netherlands, NH, Den Helder
Joined Sep 2005
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Quote:
Originally Posted by joel0407 View Post
Search around. I'm pretty sure I have seen a hack to get RSSI of the board.
Ok thanks mate, if you know where to look please give me a hint
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Old Aug 03, 2012, 04:48 AM
voyager4
The Netherlands, NH, Den Helder
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I have search and search but I can't find the hack for the RC302
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Old Aug 07, 2012, 06:28 AM
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Hi Guys

I have finally received in the mail today my LM358N IC's. I have attached a diagram of how I 'think' it should be connected. Can someone confirm?

Cheers

Jason
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Old Aug 07, 2012, 06:47 AM
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the two top left pins should be bridged.
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Old Aug 07, 2012, 08:54 AM
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Hi dichter04

Thanks for the quick reply. Pin 2 is 1IN-. Are you saying that I should bridge this with Pin 1OUT (RSSI Out)? Also, after adding the IC do I still need swap RSSI leads (see below)?

Video RX 1 RSSI Out => Diversity 2 RSSI In
Video RX 2 RSSI Out => Diversity 1 RSSI In

Cheers

Jason
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Old Aug 07, 2012, 02:25 PM
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No, you should bridge the two top left pins of the IC.

Switching RSSI signals.
For the 305: yes. For other recievers: I don't know.

You can try this out. BevRC Easy Diversity has two LEDs showing which signal it choses.
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Old Aug 07, 2012, 03:13 PM
voyager4
The Netherlands, NH, Den Helder
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as Bevrc say there is no rssi on the RC302, but inside it looks the same as the RC305. So I measured the pin (same as RC305) and this gives 1.40volt with tx off, turn on the tx then the voltage is 1.21v , so is this Rssi or not? I realy don't know so maybe someone has a good tip?
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Old Aug 07, 2012, 04:50 PM
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Hi dichter04

Much appreciated.

Cheers

Jason
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Old Aug 07, 2012, 05:30 PM
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Austria / Vienna
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Quote:
Originally Posted by WhiteNite1971 View Post
Hi dichter04

Thanks for the quick reply. Pin 2 is 1IN-. Are you saying that I should bridge this with Pin 1OUT (RSSI Out)? Also, after adding the IC do I still need swap RSSI leads (see below)?

Video RX 1 RSSI Out => Diversity 2 RSSI In
Video RX 2 RSSI Out => Diversity 1 RSSI In

Cheers

Jason
Yes, that is ok for rc305
for the wiring ... see the picture taken from a modded rc305
Thomas
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Old Aug 15, 2012, 09:25 PM
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Carmichael, CA
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Alternative opamps?

I have a few UA741C general purpose opamps in my spare parts box (datasheet here). Will those work as well as the LM358N? I'm not an expert in electronics, so I'm not sure if the 741 would create more noise or something.

I was thinking there's enough room for 2 resistors in there, so why not invert the output of the opamp so the cables going to the diversity control don't have to be reversed? I attached a sketch of my idea below.

Also in the wonderful tutorial linked above, he's powering the opamp from the rx module (pin 5, the green wire next to rssi). Does that go directly to the lipo, regulated 5V, 3.3V, ...? Just curious, because 741's require 5-40V.

You may have noted I drew my power supply to those 2 empty pads on the rx... the pad with the red line is connected to pin5 on the module, and the pad with the blue line is connected to ground. Just keeps things cleaner IMHO, but no different that other pics you've seen with 305's modded for rssi.

Kev

[edit: I did some testing onthe 741 with 1k resistors... inverting won't work!

The output was inverted, but with a smaller range that I'm not sure will work with the Micro Diversity. With an input of 0V, the output was half the lipo voltage, or 3.6V (as expected). With 5V input I got 1.4V output, not zero... not sure why? I suppose with a 10V supply an output of 1.4-5V is possible, but still not 0-5V and certainly not worth the hassle versus swapping the rssi plugs.

Anyhow, I shall try powering a 741 with the 2s lipo and wiring it as a unity buffer like the original 358 circuit. Pin 5 is in fact 4.9V, which isn't enough for the 741. Note that lipo voltage can be tapped on the left hand side pin of the big 5V regulator shown in the attached photo (the regulator is the square chip that is soldered to the big shiny ground area on the right of the PCB).]
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Old Aug 16, 2012, 02:24 AM
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OK, I tested this and it works great. This method takes the extra load off off the 5V line (perhaps less noisy than the other method?). Since the 741 is perhaps the most popular opamp ever, most stores like Radio Shack, Frys, or similar will have them in stock. If you have a friend who's a circuit geek, ask him/her if they have a couple spare 741's you can have.

Cheers,
Kev

[edit: Please note that using 741 opamps may create more noise inside your Rx, since it uses more current and voltage than the 358 opamp. Basically, only use 741's if you're desparate, but the right way is with 358's. ]
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Old Aug 16, 2012, 05:00 AM
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Austria / Vienna
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Quote:
Originally Posted by Truglodite View Post
OK, I tested this and it works great. This method takes the extra load off off the 5V line (perhaps less noisy than the other method?). Since the 741 is perhaps the most popular opamp ever, most stores like Radio Shack, Frys, or similar will have them in stock. If you have a friend who's a circuit geek, ask him/her if they have a couple spare 741's you can have.

Cheers,
Kev
Hi Kev,

great, that you brought Michael´s idea to perfection !
i´m using the mod with the LM358N, because this opamp is easily available in europe (always on stock at "conrad electronic"). therefore i never thought about the use of a "more common" part

cheers Thomas
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Old Aug 28, 2012, 08:17 PM
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Norway, Nordland, Leknes
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Originally Posted by Thint1 View Post
hi,

if you plan to use the diversity on a "MyFlyDream"-tracker you have to mod the diversity to switch the audio (embedded gps for the tracker) too.
this mod is very easy. you need a 5V-relais with one toggle switch. connect both audio signals to the toggle and the base to the trackerá audio in.
the relais is driven from the plus "before" one of the status-led´s of the diversity. for example if you take the led for rx1 you have to connect audio rx1 to "NO" and audio rx2 to "NC" on the relais.

cheers Thomas
Hey. Can you give me an example of such relay?

Bjoern
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Old Aug 29, 2012, 05:49 AM
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Austria / Vienna
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Originally Posted by Thidsa View Post
Hey. Can you give me an example of such relay?

Bjoern
hi Bjoern,
i use this relais, but any other relais for 5V will do the job.
http://www.conrad.at/ce/de/product/5...archDetail=005

cheers Thomas
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