Portable MS utilizing FSK and HSCW communications modes on 28
through 222 Mcs. W7EME/P
through 222 Mcs. W7EME/P
As a private contractor in specialty remote and wilderness communications I
have gained a fair amount experience with MS or meteor burst communications.
In a typical commercial installation, a slave transceiver collects data from
instruments it is interfaced with and listens for the master station. When the
slave hears the master's pilot being reflected off of a meteor trail it immediately
bursts packets of the data it has accumulated since the last hand shake. The
master then sends a thank you tone and pilot looking for a fresher packet. This
is simply repeated continuously.
I enjoy playing with MS and have built a small piece of travel gear. I have found
the best overall antenna is simply a dipole. I build them with a gamma match for
simplicity as a smooth antenna pattern means little in this application. The
Master station is always the "other" station as it is their ERP that makes the
QSO complete. Here are some pictures of my 600 watt portable and matching
antenna for MS on 144 mcs. This box simply sits on the ground at the antenna.
It is portable to me, but a smaller could be put together by anyone to their
tastes. I also have a 26 VDC PSU that runs this and it is in a rubber tote. This
dipole approach is very effective and as I have said earlier, it is widely accepted
in the commercial realm.
have gained a fair amount experience with MS or meteor burst communications.
In a typical commercial installation, a slave transceiver collects data from
instruments it is interfaced with and listens for the master station. When the
slave hears the master's pilot being reflected off of a meteor trail it immediately
bursts packets of the data it has accumulated since the last hand shake. The
master then sends a thank you tone and pilot looking for a fresher packet. This
is simply repeated continuously.
I enjoy playing with MS and have built a small piece of travel gear. I have found
the best overall antenna is simply a dipole. I build them with a gamma match for
simplicity as a smooth antenna pattern means little in this application. The
Master station is always the "other" station as it is their ERP that makes the
QSO complete. Here are some pictures of my 600 watt portable and matching
antenna for MS on 144 mcs. This box simply sits on the ground at the antenna.
It is portable to me, but a smaller could be put together by anyone to their
tastes. I also have a 26 VDC PSU that runs this and it is in a rubber tote. This
dipole approach is very effective and as I have said earlier, it is widely accepted
in the commercial realm.
1/2 wave dipole with gamma
feed 50 Ohm for 144 Mcs.
Sites in and on holder
tripode at 1 wavelength high,
this is all that is needed for
MS.
feed 50 Ohm for 144 Mcs.
Sites in and on holder
tripode at 1 wavelength high,
this is all that is needed for
MS.
