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<DIV>If you look at the pictures, these appear to be part of terrestrial
microwave systems, NOT satellite. They appear to operate on various
terrestrial microwave bands, according to the labels on the equipment.
11/10gHz, 23gHz, 18gHz. Probably from an old government point-to-point
microwave system.</DIV>
<DIV> </DIV>
<DIV>ODU is a generic term for OutDoor Unit, not always associated with
satellite equipment. This stuff could be of interest to hams. A dish
is a dish, and a different feed could be installed at the focal point, for
example. To a point...</DIV>
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<DIV><FONT face=Arial>Looks like fun to play with, but don’t expect to hit any
satellites with this stuff.....</FONT></DIV>
<DIV><FONT face=Arial>73, Terry, N4TLF</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A
title=samudra.haque@gmail.com>Samudra Haque</A> </DIV>
<DIV><B>Sent:</B> Wednesday, May 03, 2017 10:20 AM</DIV>
<DIV><B>To:</B> <A title=tacos@amrad.org>tacos@amrad.org</A> </DIV>
<DIV><B>Subject:</B> Re: mw dish surplus</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<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>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> </DIV>
<DIV>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> </DIV>
<DIV>Tad</DIV></DIV></DIV>
<DIV class=gmail_extra>
<DIV> </DIV>
<DIV class=gmail_quote>On May 2, 2017 11:15 AM, "Alex Fraser" <<A
moz-do-not-send="true">beatnic@comcast.net</A>> wrote:<BR
type="attribution">
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex">
<DIV bgcolor="#FFFFFF" text="#000000"><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
class=m_2504503522127539573moz-txt-link-freetext
href="https://www.publicsurplus.com/sms/auction/view?auc=1844379&trackId=50"
target=_blank
moz-do-not-send="true">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></DIV>______________________________<WBR>_________________ Tacos
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