No, it's actually trivial:
1. The PMBO's tranceiver's audio output is currently connected to the
Pactor Modem's audio input; add a connection to the soundcard input
(this might require adding a soundcard if one isn't already present
in the PC that hosts the PMBO server software)
2. The SCAMP Busy Detector (SBD) is incorporated in the PMBO server
software (Server); this is entirely initialization and configuration
(e.g. soundcard selection, detection thresholds). Once configured and
initialized, the SBD is a black box with a single boolean output that
indicates whether or not the current transceiver frequency is busy.
3. The PMBO server software (Server) is in one of two states: Idle,
or Processing a User Request; we need only modify its Idle state
behavior. When the SCAMP Busy Detector (SBD) transitions from "not
busy" to "busy" while the Server is Idle, there are two possibilities:
a. the frequency is busy because a WinLink user is transmitting a
request to the PMBO
b. the frequency is busy because another QSO has begun or become
audible due to changing propagation
To distinguish between these two possibilities, the Server waits X
milliseconds after the SBD first reports "busy frequency", where X is
the worst-case time required by the Pactor Modem to decode and report
an incoming WinLink request. If such a request arrives from the
Pactor Modem within this interval, then the Server processes it as
usual, ignoring the SBD. If no such request arrives within the
interval, then the Server clamps the Pactor Modem into its reset
state, preventing transmission on the frequency; this clamped reset
is maintained until the SBD reports "frequency clear" for Y
consecutive seconds, after which the Server re-initializes the Pactor
Modem and returns to Idle. 60 < Y < 300.
73,
Dave, AA6YQ
--- In [email protected], "jgorman01" <[EMAIL PROTECTED]> wrote:
>
> I don't know how hard it would be to pull this part of the software
> out and run it on its own AND to control a transmitter with it.
> Remember, the pmbo is probably seeing a CTS indication from the
pactor
> modem. You would have to use another receiver and pc running scamp
> and somehow get the pmbo software to recognize the CTS from that
> route. Probably not easy. It might be easier to get SCS to include
> it in their firmware.
>
> Jim
> WA0LYK
>
> --- In [email protected], "Dave Bernstein" <aa6yq@>
wrote:
> >
> > I agree with your point, Jim. However, it doesn't explain the
failure
> > of the WinLink organization to incorporate the SCAMP busy
detector in
> > each of their PMBOs. This would have no impact on WinLink users,
and
> > minimal $ impact on PMBO operators.
> >
> > 73,
> >
> > Dave, AA6YQ
> >
>
