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By: montis

montis — Thu, 28 Jan 2021 16:02:32 +0000

All the tested VTX’s are supplied with +12V voltage (except the ones that require +5V voltage input). Voltage drop on the input is less than 0.5V on the maximum RF power output. So the VTX has enough voltage supplied. The TX805S VTX overheats very quickly and then shuts down.
The low power output can be due to the poor pigtail quality, defective item, but these test results are real. I always use the pigtail, supplied in the package, to get the real world data. I assume that you would use the same pigtail that comes in the package. If I got bad/defective item or poor quality pigtail, that means you could get the same problem.
Bottom-line: I don’t recommend this VTX based on my test results.

By: Russell N Mirov

Russell N Mirov — Wed, 27 Jan 2021 00:20:23 +0000

Do you remember what voltage you were supplying the VTX with? Some of this class of transmitters regulate the incoming wide range voltage down to 5V for the camera, and then run the transmitter module off that same voltage. To get the higher output power levels either the voltage has to go up or the current does – and perhaps at 5V it is just running out of supply current at the DC/DC converter output. Note that the spec says 12V, but if you ran the test with a 2S input (allowable given the 7-26v input range) the converter would have to work a lot harder to put out the extra wattage.

By: montis

montis — Sat, 09 Jan 2021 21:14:45 +0000

In reply to Bonzai. Thanks, I'm really happy you find them useful! You can look at the all VTX's I've tested here: http://www.dzskam.com/?s=Review+VTX. I've tested about 17 VTX's so far. And a dozen waiting to be tested :) .

By: Bonzai

Bonzai — Sat, 09 Jan 2021 17:44:25 +0000

Yeah seriously these VTX review tests are great. Keep up the wonderful work you do ?? are there other vtx tested in this way on here somewhere? and thank you!