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发信人: ham (U2), 信区: Areospace
标 题: 业余卫星通信Amateur Satellite FAQ -- Part V
发信站: 紫 丁 香 (Thu Nov 27 16:39:04 1997), 转信
**** From AMSAT (国际业余卫星组织)
Post by 哈工大业余无线电俱乐部(HIT Amateur Radio Club)
******************************************************
Part V -- Rigs设备
RIGS:
Three radios were mentioned by name - Yaesu FT736 (and it's predecessor,
the 726 with satellite module), Kenwood TR751 (a mobile-capable 2 meter
multimode), and Ten-Tec's 2510. The Ten-Tec unit is out of production.
The few units left are selling for about $300-350. I'm sure other multi-
mode radios, and setups with converters and transverters work well, too -
it's just that no one mentioned any by name.
Power output required is a function of the satellite, your antennas, and
how badly you want to communicate. [QRP on the satellites is just like
QRP on HF - you need good antennas and feedline, you have to pick optimal
passes, and skilled operators at both ends are needed. Given the apparent
"calmer" operating style on AO-13, QRP is probably easier there than on
20 meters!]
Anyway -about power for AO-13. 3-30 watts will work if you have top-notch
antennas (KE4ZV). KC7IT uses 50-100 watts (Ten Tec 2510, Mirage D1010
amplifier, KLM 14C/18C fed with 50 feet of 9913). Both KE4ZV and KC7IT
use Mirage D1010 amplifiers on 70 cm when they need a little extra power.
For an "optimum station", WA5ZIB recommends 60 watts on 70 cm and 80 watts
on 2 meters for AO-13, assuming good antennas (Telex/Hy-Gain or better) and
feedlines, and 20 watts to a 5' dish for Mode L. Andy emphasized that you
can get by and have lots of fun with much less!
For Mode A, WA5ZIB said 6 watts to the AO-13 2 meter antenna will work well.
People using omnis report success with the Pacsats running 50-70 watts to a
J-Pole (N5VGC). Several people said they (or someone they know) have no
trouble using RS-10 at lower power (10-25 watts) with simple, omnidirectional
antennas. Again, it's a case of "try it and see if it works."
There was unanimous consensus that the receiving quipment (antenna, preamp,
feedline, and receiver) is more important than the transmit equipment.
Running more power "to hear yourself" is frowned upon, to say the least!
It's also important to be able to vary uplink power to adjust to specific
conditions. Both the Ten Tec 2510 and the Yaesu 736 have continuously
variable power output (I guess the rest of us just have to fiddle with the
drive controls on our rigs!).
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