[Moon] 8N1EME Project BIG-DISH

[M. Watanabe]

Hi all;

8N1EME began test transmission on 18 Feb., first 144 and 432 MHz, 500 watts
output each.
1296 HPA installation to the dish pedestal is delayed, but the antenna feed
was already put on
to the main reflector.   SWR analysis showed very good on each band.
Antenna is still fixed
upward, so no moon echo was detected.
KDDI technicians request us to reduce (or totally erase) the harmonics; for
example, 9th
harmonics from Henry 2006A (3CX800A7) which falls into the C-band, 3888 MHz
(wow!).
Their C-band receiver with the same antenna in the same shack, detected this
harmonics, naturally.

1296 may be a problem; only the 3rd harmonics comes into the C-band.  We
install a quater-wl
BPF with variable link-coupling (resembles that of N6CA) with -44 dB at 2nd
harmonics,
and -34 dB at 3rd.  But still they might detect our harmonics with certain
high level.
The harmonics supression of less than - 60 dBc suppression seems to be
tolally insufficientl!

Is there anyone who tried notch or filter with some 90 dB or more
suppression for 500 watts?

We will have the station investigation by the telecom officials on 23 Feb.
afternoon, and if passed,
we can contact you off the moon, from (perhaps) 07 or 08Z to the moon-set of
25 Feb.

For the up-dated details, see our web.
http://8n1eme.jp/


Mike JH1KRC



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