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Old 14-Oct-2020, 1:11 AM   #8
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,747
Quote:
Originally Posted by eclipsme View Post
Tower Guy said, "If all of your TV channels are on UHF, (14-36); you may use a UVSJ to combine 137 MHz with the DB-8. " Googling for a 'UVSJ', this appears to be a VHF/UHF combiner, or am I wrong about that?

Perhaps I am not understanding what the USVJ is, though.
You can use a UVSJ to combine your UHF TV signals with your 137 MHz signals.



The UVSJ will pass 137 MHz signals on the VHF port while blocking any UHF signals picked up by the 137 MHz antenna. Also, it will pass UHF signals on the UHF port while blocking any 137 MHz signals picked up by the UHF antenna.

Quote:
I thought that a standard combiner might be able to combine high VHF with either the combined output of the UVSJ or perhaps with the 139mhz signal before the UVSJ.
If you mean a splitter in reverse as a "standard combiner," that will probably not work. The same signals from each antenna will interfere with each other when they reach the "combiner."
Quote:
The VHF channels I am interested in are 11 and 12.
You would need an expensive filter combiner to have VHF TV, UHF TV, and 137 MHz on one downlead. I suggest a separate coax downlead for the 137 MHz antenna.
Attached Images
File Type: png RS15-2586UVSJ FreqResp4.png (117.4 KB, 1202 views)
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Last edited by rabbit73; 14-Oct-2020 at 1:19 AM.
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