Re: 6cm rf?
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Mark GM4ISM
Ben Both seem to use the same output device The device is designed for wideband data modes at 400mW. This
requires high linearity, hence the typical single tone P1db of
34dBm (min is +30) Efficiency at 26dBm is not great, probably better in CW mode but you've got to get quite a lot of heat out of a small area. The data sheet from Skyworks does not give any thermal info and it may be that key down CW at 2W will overheat the junction. In amateur use the TX duty cycle helps us and it may be able to
run at 2W out for typical QSOs, if on a good heat sink. The
40dB gain module will need to be bolted to one. We also don't
often have high ambient temperature that may push the limits So, with the usual caveats, if the devices are genuine and full spec and the board has been properly designed (thermally) 2W PEP is not impossible without damage. It is interesting that the second one states 1W for the same device, perhaps being a little more conservative. None of the vendors are saying how long the device will last at
the P1dB level key down... Even at 1W these represent reasonable value for money... if they
work as advertised. If they dont, send em back! Mark GM4ISM
On 20/05/2021 11:44, militaryoperator
via groups.io wrote:
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