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<div class="moz-cite-prefix">Just in case one (anyone) would like to
experiment with satellite ODU, there are a variety of flavors:
C-band (much desired), Ku-band, and Ka-band (desired). All of the
upconversion takes place at the ODU. However, commercially, I have
owned and operated large fleet of VSAT (Very Small Aperture
Terminals) which typicaly use a modem (either 70 MHz, 140 MHz or
L-band as intermediate frequency), and the TX upconversion and RX
conversion (both!) take place in a single housing, that is the ODU
in common parlance. Ex: Anacom transceivers
(<a class="moz-txt-link-freetext" href="https://www.anacominc.com/prod_anasat.html">https://www.anacominc.com/prod_anasat.html</a>). So if you see a
large box, that includes: up/down converters, psu, HPA, dual
synthesizers etc. good for lots of microwave parts and waveguides.
<br>
<br>
On the other hand, most fixed satellite service TWO-WAY terminals
have a polarizer (either linear or circular) which has taps, and
transducers with different feeds- so that they TX signals are
attenuated from the RX signals. There you would use either a
waveguide/coax to the "ODU" as described above, for the RX path,
and a higher power waveguide/coax for the TX path. Or, if you had
a simple block up converter (L-band to Ku-, Ka-, C-band) only,
then a separate block down-converter (e.g., Ku-, Ka-, C-, band to
L-band) would be required.<br>
<br>
Note: old "L-band" 950-1450 MHz, new "L-band" upto around 2000
MHz. Not specific, look at the specs.<br>
Also, there are often test bands on the GEO satellite transceivers
for carrier/tx/rx/loop back tests ... <br>
<br>
/samudra<br>
<br>
<br>
On 5/2/2017 4:12 PM, Tad wrote:<br>
</div>
<blockquote
cite="mid:CAFh3cp6QM-ebK2RkVvCxwG=5d-587GGmNh5-dwqLV=X8cHvo0g@mail.gmail.com"
type="cite">
<div dir="auto">That is what is typically called an "ODU" or out
door unit. It is often coupled to the IDU over coax and runs an
IF (intermediate frequency) and dc over that coax. The odu
upconverts to the over the air frequency and amplifies the
signal.
<div dir="auto"><br>
</div>
<div dir="auto">Some manufacturers just have a form of Ethernet
and power to the ODU instead and have the radio not just an
amount and frequency converter outside.
<div dir="auto"><br>
</div>
<div dir="auto">Tad</div>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On May 2, 2017 11:15 AM, "Alex Fraser"
<<a moz-do-not-send="true"
href="mailto:beatnic@comcast.net">beatnic@comcast.net</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> <font size="+1"><font
face="Comic Sans MS">Saw these on a gov auction. They
are in Loudoun county VA.<br>
2 of the antennas are on 10 GHZ and 4 are on 17GHz.
The pictures show a heat sink on the smaller
antennas. Perhaps there is a transceiver built in?<br>
<br>
<a moz-do-not-send="true"
class="m_2504503522127539573moz-txt-link-freetext"
href="https://www.publicsurplus.com/sms/auction/view?auc=1844379&trackId=50"
target="_blank">https://www.publicsurplus.com/<wbr>sms/auction/view?auc=1844379&<wbr>trackId=50</a><br>
</font></font>
<pre class="m_2504503522127539573moz-signature" cols="72">--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<wbr>~~~~~~~~~~~~~~~~~~
No electrons were harmed in the creation of this message
------------------------------<wbr>--------------------------
~~~******************* Alex Fraser *******************~~~
------------------------------<wbr>--------------------------
[[[[[[~~^^^#___=>>>```/\/\**O*<wbr>*/\/\```<<<=___#^^^~~]]]]]]
</pre>
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