Hi David
If the simulations say 13dB.. then that is what you really have,
anything else is measurement error.
In your simulations, can you produce some stats on the period /bandwidth
of these PAPR events ?
The radios have no problems with 100% duty.
I would not worry 1 little bit about silicon puddles, that is not where
the dissipation problems are -they're generally operating at good
saturated efficiency.
Generally antenna tuning parts can get hot , low pass filters, antenna
tuners, baluns etc.
yeah, I agree, try to get the SIMULATED PAPR down below 7dB. I think
you'll find there are some low hanging fruit to get the PAPR to 7dB.
This of course will need some horsepower in the encoder to deal with. In
thee SM1000, how much is available on TRANSMIT , I guess mostly it is
CODEC encode plus forward FFT, and some LDPC LUT stuff.
g
On 19/06/2020 06:36, David Rowe wrote:
Hello Glen,
Consider though, that if you are at 10dB peak to average , that is 10W
RMS for a 100W amplifier. Utilization of the 100W PA is not good !
Yes, and I would like to see if we can reduce PAPR (say by 3dB as a
firsts step) using some of the tricks you mentioned.
However I am concerned that many of the SSB PAs in Ham radios aren't
rated for high RMS powers. They are probably biassed differently for CW
of FM operation. Bit worried about generating puddles of silicon, which
I understand happened in the early days of HF DV.
_______________________________________________
Freetel-codec2 mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
