http://elecraft.85.s1.nabble.com/K3-Panadapter-SoftRock-tp447539p447542.html
Keep in mind that the spurs generated will probably [produce a signal that
that technically inclined. To digitize the signal really won't gain you a
>
> On May 16, 2007, at 11:53 AM, Edward Dickinson, III wrote:
>
>> I'm not exactly sure we are talking about the same thing.
>>
>>
http://www.aorusa.com/ard9800.html>
> Yes, we are talking about the same thing. They take the voice and
> digitize it and then put the data stream into multiple PSK carriers that
> fill up the entire voice bandwidth (2.7KHz).
>
> I would take their claim of, "The digital signals may require LESS SIGNAL
> than analog throughput making operations possible under adverse band
> conditions," with a grain of salt as not too long thereafter they say:
>
> "Your duty cycle will be more intense. This is important to users of
> amplifiers. Because the digital signal makes full use of the SSB audio
> bandwidth, you should consider that you will be transmitting at the
> maximum power output you have selected. At maximum power settings, this
> will likely result in your transmitter consuming more power and
> generating more heat. If you transmit images or large data files, your
> "key down" time could be three minutes or more."
>
> This tells me that they are transmitting with higher average power so of
> course more power reaches the destination. I think they are counting on a
> much smaller peak-to-average ratio than SSB so S:N is more consistent.
>
> Time to become familiar with the term Eb/No.
>
> But this is not really SSB, at least, not as we think of it. They are
> generating the digital signal at what would be a very low IF (300Hz -
> 3000Hz). We think of that as being audio but it is really just a very,
> very low IF. They modulate a number of carriers in that spectrum and then
> use the SSB transceiver to translate that up to the final RF frequency.
> The SSB transceiver is being used as a linear translator. PSK31 and AFSK
> (RTTY) work exactly the same way.
>
> 73 de Brian, WB6RQN
> Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com
>
>
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