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These parts often fail due to exceeding the duty cycle of the high power input. The main RF I/O N connector on these units should be very close to 50 Ohms and if more than 5% out should be replaced.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.