Aside from the obvious (and legit) response of...."why would you want to do that?", could it be possible to wire a 900Mhz and a 2.4Ghz receiver to the same f/c at the same time? The thought popped into my head head today as I was working. My thinking is that you could just swap out the radio module depending on what would be best for your flying environment and not have to futz around with the quad. Just plug and play, as it were.

     I'm guessing it would come down to whether or not the f/c software can recognize inputs from 2 different UARTS and automatically accept the active one. That brings up the question of binding 2 receivers on the same rig. I assume this shouldn't be too big of an issue as each receiver will bind to its respective module and is not really a function of the f/c, assuming the proper protocol is selected for each UART.

     Again, this just popped into my head and is purely an academic question and don't see any real world application for it. If I was going to use 1 quad for long range and close in flying I would certainly choose the option with the longer range. It should be more than enough for everything else I will ever do...and save the extra weight and cash.


     ...but can it be done?

Betaflight wil not support 2 serial_rx connections.

You can still wire 2 RX’s but then rely on the Betaflight or Speedybee app on your phone to switch between either RX by making changes to the Betaflight ports in the field activating serial_rx on the port for the receiver you plan to use during that flight.

Dual-band ELRS is being worked on. It would involve both 900MHz and 2.4GHz on the same receiver.

It's an interesting idea, and would allow for higher packet rates, longer range, less jitter, etc. Hopefully it pans out!

diversity frequency for for a receiver :-) that sounds very nice

For funsies…. I don’t see why you couldn’t wire both to the same pads with a single pole double throw switch in line on the positive wire so that you could just flip the switch to whichever rx you wanted prior to powering up?

I mean yeah, the switch would add extra weight, but so would 2 rx, and you said this was an academic question.

(20-Jan-2022, 06:58 PM)Lemonyleprosy Wrote: For funsies…. I don’t see why you couldn’t wire both to the same pads with a single pole double throw switch in line on the positive wire so that you could just flip the switch to whichever rx you wanted prior to powering up?

I mean yeah, the switch would add extra weight, but so would 2 rx, and you said this was an academic question.

Great suggestion. A simple switch should do the magic of powering one RX at a time.

(20-Jan-2022, 02:52 AM)kafie1980 Wrote: Betaflight wil not support 2 serial_rx connections.

You can still wire 2 RX’s but then rely on the Betaflight or Speedybee app on your phone to switch between either RX by making changes to the Betaflight ports in the field activating serial_rx on the port for the receiver you plan to use during that flight.

So you can wire up multiple receivers but would have to switch it to the active one in software. Gotcha. That's what I was wondering.

Thanks for all the replies. I like the idea of the SPDT switch in the power line.

Can you use the Tinysleds VTX switch. It just switches power

https://www.racedayquads.com/products/re...-tinysleds

Scott

(21-Jan-2022, 12:56 PM)Scott_M Wrote: Can you use the Tinysleds VTX switch. It just switches power

https://www.racedayquads.com/products/re...-tinysleds

Scott

I think it would require two of those? Being able to map it to a toggle switch on the tx would be nice, but I’m not sure how that would work if hitting the toggle switch turned off one rx and turned on the other, or how it would work if he had to put in a 900mhz module into the tx, hit the toggle switch to change to the 2.4 rx, and then swap out modules on the tx and vice versa.

That tiny led switch looks like it good be really useful for other things though. I see ideas forming in my head.

(21-Jan-2022, 06:56 PM)Lemonyleprosy Wrote: That tiny led switch looks like it good be really useful for other things though. I see ideas forming in my head.

I bought 2 when I saw them I was going to make a "landing" camera set up.

Scott

With the Realpit If you accidentally flick the switch then you will need to use the other TX module to switch back. Unless you have 2 radios with individual modules this will be a pain.