Tag Archives: XV9AA

Viêt HAM (VTÐND)

First high altitude balloon flight in Viet-Nam

1 Comment

The FSpace team (leaded by XV9AA), having already achieved the successful launch of the F-1 cubesat, has now reached a new milestone. They have entirely succeeded in building, launching, tracking and recovering an high-altitude balloon using several Amateur Radio technologies like APRS.

FSpace balloon payloadThis is a rare event in Vietnam for several reasons, including the fact that civilian aviation regulations are not as developed as in western countries. This open the way for more experiments and will help the country to gain skills and experiences in aircraft and space technologies.

As facts, the balloon reached an altitude of about 70.000ft (more than 21 km), flew for more than 2 hours over 200 km. The two way trips to recover it by motorbike took longer…

Viêt HAM (VTÐND)

JAXA confirmed F-1 cubesat deployment for September 27th

F-1 cubesat assembly in F-Space labsThe japanese space agencies have confirmed the vietnamese cubesat F-1 and its companions will be deployed on September 27th 2012. This will be the first deployment of 5 cubesats from Kibo module and it will serve as a test to further simple and inexpensive launches from the ISS via the japanese HTV cargo. F-1 lifetime in space before re-entry is forecasted to be 250 days. Good luck!

Viêt HAM (VTÐND)

EME QSO from Viêt-Nam

XV9AA told us a little bit more about his activities with Earth-Moon-Earth transmissions. Vu Trong Thu :

“EME communication had always been in my dreams since I learned about it and after our unsuccessful attempts last year.

It is difficult, but there are things that you can do to improve your chance of success and especially thanks to a new software called WSJT developed by Joe Taylor K1JT which
allows the computer to decode very faint signal down to -28 and even -30dB! These together with the fact that I arranged a sked (schedule) with “big gun” stations resulted in successful EME QSOs.

Here’s my conditions: Home station (XV9AA): Moon near perigee (closest to the Earth), about 10 degree above horizon (to maximize ground gain), digital mode JT65B/WSJT, USB mode, 100W output, 144Mhz band, mast-mounted preamp, antenna is 2MCP22 circularized polarization (used for satellite communication) but I disconnected the vertical part and only use the horizontal one (11 elements) for EME.
DX station (KB8RQ): array of 8×4=24 long Yagi antennas, 1.5kW output.

For your information, last week I had another successful EME QSO with RA6AX who probably has the largest VHF amateur radio antenna array of 64 Yagis and 1.5kW output.
His signal peaked at -16dB while mine peaked at -26dB which is well within the capability of WSJT to decode. So I think I can do EME with 50W or even less :)”