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Vtx temperature


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From the manual concerning hot running

 

Installation / Mounting 
When installing the Unify Pro, please ensure adequate airflow and - most importantly - heat transfer. This 
means mounting the Unify Pro with a bit of pressure against a flat piece of carbon will give you the best 
results. Proper mounting will allow the video transmitter to run for extended periods of time while sitting 
on the ground, both with 25mW and 200mW power levels. On 500mW / 800mW power levels, we 
recommend to start flying after a maximum of 1 minute, so that the airflow can begin to provide adequate 
cooling. 
When video transmitters heat up they start transmitting with less output power. There is also chance of 
the power supply circuit overheating. Don't worry, the Unify Pro will detect excess heat and shut down 
until it recovers. But that will also mean the video transmitter will not transmit. If you are experiencing 
that the video transmitter shuts down, check your installation. Ensure that heat can be drained well and 
make sure that there is a bit of airflow access to your VTx.
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  • 1 month later...
On 08/12/2023 at 16:10, Edgeflyer said:

I am using a TBS unify pro 5g HV race and within a minute it gets too hot to hold. It is currently set to 200mw so I could set it at 25mw and have low range but how much difference does it make and is there any point? Do any vtxs run cooler?

- If the transmitter is designed to work at 200mW then it may simply need some airflow around it. I'm guessing it operates at 5.8GHz?
- As installed maybe the antenna isn't radiating well and a poor match to the transmitters output FET - try placing the antenna outside and away from metal objects, battery and receiver. Similar problems occur if the antenna connectors are dirty, worn, damaged or not tightened.
- Maybe locate the antenna to the underneath of the glider and orientated to ensure the radiation pattern is downwards to your receiver. You may then get away with a 25mW setting? A hemispherical pattern antenna radiating downwards is probably the best option for a glider.


Just be aware, transmitting at 200mW in the 5.8GHz band in UK would require a licence, the limit for unlicensed at 5.8GHz is 25mW:
https://www.ofcom.org.uk/spectrum/rules/licence-exempt-radio-use/licence-exempt-devices/Radio-controlled-models

and scroll to the table at the bottom.

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