Re: [softrock40] Push to talk or key input in a simple SDR transceiver
- The Delta 44 running your WDM-KS or ASIO interface is 4 gazinta and 4
Alex, VE3NEA wrote:
> Hi Tony,--
> It is not clear from your posting what the purpose of telling the
> software about the RX/TX state is. Generation of the I/Q TX signal is
> not a CPU-intensive task, and the program can do it continuously. The
> hardware switch will just enable or disable the TX mixer when the PTT
> button is pressed/released. I agree with Guido that two sound cards
> are required in the transmit mode - we need two lines for the I/Q
> output, and at least one other line for the sidetone signal. One
> cannot use the software keyer if he cannot hear what he sends!
> The answer to your question about the speed of your solution is no,
> this is not going to be fast enough for QSK. I expect the roundtrip
> time to be on the order of 100 ms, counting the delay introduced by
> the filter that will extract the tone from the I/Q signal.
> 73 Alex VE3NEA
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity. Guilty as charged!