What about Softrock Tx? That would generate the RF.
Chris
G4NUX
On 12 Oct 2009, at 22:28, Leif Asbrink wrote:
Hello Jose,
> I have seen no software capable of generating it so far. Actually,
it
> would require two sideband generators. I am not sure if a single
sound
> card could actuallydo it.
It is a trivial thing to generate ISB in the PC and send it to the
soundcard. Nobody is interested because there is not any hardware
available to frequency shift it to RF and to amplify to a suitable
power level.
One could make a signal with about 5 kHz bandwidth available on a
single
audio channel. It would match an SSB transmitter with a passband from
e.g. 300 to 5300 Hz. One could also make it available as an I/Q pair
with
i.e. 300 to 2500 Hz passband (stereo). That would fit a simple
quadrature
modulator.
> ISB has not been usual among hams, but could be interesting. Once
I read
> a proposal for using SSTV on one sideband and audio on the other,
> but have heard noone doing that.
The problem is the amplifier chain. Conventional equipment does not
have the bandwidth in SSB mode.
I think we will see experimenting with ISB and other new modulation
schemes
when we have more digital equipment around. The HPSDR, Mercury
+Penelope
would allow voice+SSTV as ISB or in some suitable digital format
and everything would be in software.
I could easily transmit ISB with my Linrad transmitter, but I do not
have any second signal besides the microphone (No SSTV.) It will not
be interesting until there is a reasonable chance of meeting someone
on the bands who is capable of receiving both sidebands. I am sure
we will
see it some day because it is an obvious thing to implement in a SDR
transceiver:-)
73
Leif / SM5BSZ
