Operating tr(u)SDX at low efficiency
Posted: 28 Apr 2022, 08:12
Hi,
I have just finished building a *Rxxxx* batch B3 kit. As seen with other kits from *Rxxxx*, efficiency is extremely low, i.e. in my case I get 4 - 5 watts@12V, but efficiency varies between 45 and 65% depending on band. That values are far below the specs!
While I could live with the output power, what would actually happen if one would operate the transceiver at those low efficiency numbers, in particular in CW mode? Will it blow the PA transistors of the class E transmitter even if a resonant antenna is used having a SWR <1.5 - 1.0 ? Is it better not to use the transceiver at those efficiencies and wait until *Rxxxx* comes up with a solution?
I follow the other thread on this topic (which is now 6 pages long), but I am not sure what would be the actual consequences if one intends to operate the transceiver anyway.
Regards,
Chris
I have just finished building a *Rxxxx* batch B3 kit. As seen with other kits from *Rxxxx*, efficiency is extremely low, i.e. in my case I get 4 - 5 watts@12V, but efficiency varies between 45 and 65% depending on band. That values are far below the specs!
While I could live with the output power, what would actually happen if one would operate the transceiver at those low efficiency numbers, in particular in CW mode? Will it blow the PA transistors of the class E transmitter even if a resonant antenna is used having a SWR <1.5 - 1.0 ? Is it better not to use the transceiver at those efficiencies and wait until *Rxxxx* comes up with a solution?
I follow the other thread on this topic (which is now 6 pages long), but I am not sure what would be the actual consequences if one intends to operate the transceiver anyway.
Regards,
Chris