[evlatests] Fwd: Orbital LNB RF emissions test report

[Keith Morris]

Here is the report from Dan Mertely's shielded chamber testing of the 
new API front end Low Noise Block Downcoverters (LNBs), where the 
10750MHz LO originates.  The recommended shielding gaskets have been 
installed, and these were shown to suppress the and 2687.5MHz and 
5375MHz LO subharmonics to within acceptable levels.  The 10750MHz LO 
was not found to radiate, with or without the shielding gaskets.

The "old" API system uses the same 1st LO frequency, 10750MHz, but it is 
synthesized by a different mechanism, and housed in a different kind of 
enclosure.  This is what is believed to be the source of the interferor 
that Rick has reported.  When the old API system is decommissioned, this 
interfering signal will go away.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: modified-OS-LNB1075S-500X-WN60-emissions-test-report.pdf
Type: application/pdf
Size: 490020 bytes
Desc: not available
URL: <http://listmgr.nrao.edu/pipermail/evlatests/attachments/20130723/8ec667ee/attachment.pdf>