Od: email@example.com za uživatele M.
Odesláno: 18. února 2007
Komu: firstname.lastname@example.org; K1rqg@aol.com
[Moon] 8N1EME Project BIG-DISH
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
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
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
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