Differences

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--- 1296mhzfeed [2026/04/23 03:21] – olt
+++ 1296mhzfeed [2026/05/17 23:07] (current) – [1296 MHz Feed] dsheen
@@ Line 7: / Line 7: @@
 Note that reflection off the dish flips the polarization, so we have configured this feed with the receive path on the RHCP port of the feed (which produces LHCP after reflecting off the dish) and the transmit path on the LHCP port of the feed (which produces RHCP after reflecting off the dish). The ports are labeled with Sharpie in case of confusion.
-There is around 20 dB of RF isolation between the RHCP and LHCP ports.
+There is around 23 dB of RF isolation between the RHCP and LHCP ports. This isolation is not sufficient to protect the LNA from high power transmit, so an additional TR relay is used to disconnect the LNA from the feed during TX.
 ===== Control Interface =====