For example, 6v versus 8.4v. More range or stronger signal with 8.4v?

Been curious for a while.

Thanks in advance guys.

No range advantage with higher voltage, the receiver circuitry gets regulated down to about 3.3v from the BEC input. Its pretty much only the BEC rail that uses the higher voltages to power servos and other devices connected to the receiver.

With some brands of radios (particularly those using direct sequencing), I have experienced glitching (range issues) when the Tx voltage dropped when using 6S NiMh cells. After switching over to 2S LiPo, this boosted my voltage from 6V to 8.4V and this eliminated my range issues on large 1/8 tracks. I wouldn't doubt there is a point of diminishing return where increasing voltage can only help so much, but it would be impossible to say for sure without testing. I don't see any reason why it wouldn't be worth trying to boost the voltage on the Rx provided it is rated to handle the power.

Good Luck!

read the spec's for receiver.. it will state the input voltage...
remember most circuits have internal voltage regulators.. NO ADDED return.

if the internal regulator is say 6 volts . putting 10 volts in.. only overheat the regulator.

just and FYI.

and remember.. its a 2 way street...

transmitter output... and type of antenna
receiver receiving over radio noise.. and antenna..

Thanks for the replies guys. It seems some testing should be done to know for sure.

.
I have been playing with and repairing 2 way radios.. since 1970....
1 watt to 2,000 watts... 160 meters to 2 meters.
N8BSJ....

yes, in the old days I used a RC 50mhz "Ham" rc radio...
I had my own channels... to share with NO ONE....

If it isn't transmitting telemetry and is only receiving I would think any potential extra voltage wouldn't make receiver more sensitive.

If the voltage wasn't regulated down the only real advantage I think would be when transmitting. (If that particular receiver also was a transmitter)

all that could be wrong though, my receiver school was over a decade ago.

Higher input voltage will not increase the RX sensitivity. It will provide additional head room to reduce the chance of brownouts. Headroom is the difference between the input voltage and the minimum voltage the RX requires to stay working.