Moe AE4JY has released the source code to his PSKCORE engine under
LGPL; its available via http://www.qsl.net/ae4jy/pskcoredll.htm .
If you were to take this code as a starting point and produce an
interface-compatible version of the DLL that transmits via RMPSK,
then the many existing PSK applications that use PSKCORE would be
made RMPSK-capable by simply swapping DLLs.
73,
Dave, AA6YQ
--- In [email protected], "expeditionradio"
<[EMAIL PROTECTED]> wrote:
>
> Is there any software available that can transmit multiple
> carriers of simultaneous redundant PSK31 or PSK63?
>
> Some PSK31 software programs presently have the capability
> to simultaneously receive multiple PSK carriers. But I am
> looking for soundcard programs to transmit RMPSK.
>
> RMPSK (Redundant Multiple PSK)
> 2 (or more) carriers of PSK31 separated by 200Hz to 500Hz,
> all transmitting "separately" with the same text/information.
> The purpose of the "RMPSK" Redundant-Multiple-PSK signal is
> to communicate through frequency-selective noise and fading.
>
> Another big advantage of RMPSK is complete compatibility with
> existing amateur standard single carrier PSK31 reception and
> transmission.
>
> In other words, regular PSK31 can talk to RMPSK31,
> and RMPSK31 can talk to PSK31.
>
> Time Synchronisation
> The carriers transmit information synchronised with either:
> (A) Simultaneous, with "zero" no time delay between carriers.
> (B) Fixed synchronized time delay of 0.10sec to 2.50sec.
>
> It is especially useful for situations where the receiving
> station has interference from digital RFI noise sources
> (such as RFI, BPL, HomePlug, TVI, computer-I, etc).
>
> Many of the RFI noise sources we experience now on HF are from
> devices such as plasma TV sets, computers, microprocessors, and
> other digital semiconductor devices that put out multiple carriers
> and frequency-selective noise. Many amateur operators live in
> apartments, condos, and flats where noise levels are high and
> external antennas are limited. In most of these cases, the
> operator does not have control over these noise sources.
>
> With a frequency-redundant signal being transmitted, the
> receiving operator (or the receiving PSK software) can pick
> the best carrier signal(s).
>
> Alternatively, all of the carriers may be combined and/or
> voted upon by the software receiver as a type of FEC,
> multi-path fading reduction, or frequency-selective fading
> reduction.
>
> In better signal/noise conditions, all of the carriers of the
> system may be combined for faster throughput of digital files,
> or image information, as an MPSK signal.
>
> As another alternate example, the content of the carriers
> could be multi-media, with one carrier having keyboarding text
> and the other carriers having image or data.
>
> About 5 years ago, one of the commercial products I invented and
> developed used a similar technique (Redundant Multiple OFDM)
> although I did it with very large (and expensive) DSP engines on
> both ends of the comm link.
>
> In 2005, I proposed this type of RMPSK technique as a solution
> for ham operators to communicate signals through BPL - PLC
> (Broadband over PowerLine) HF interference. I have not found
> any soundcard software that is adaptable to transmitting it yet.
>
> Bonnie KQ6XA
>
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