** Shares of technology firm Cambium Networks CMBM.O tank
28.3% to $5.68 premarket
** CMBM sees prelim Q3 rev between $40mln- $45mln vs.
analysts estimates of $51.79 mln - LSEG data
** Co says reduced Q3 revenue due to delay in government
defense orders
** Brokerage Oppenheimer downgrades CMBM to "perform" from
"outperform"
** "Company has fundamental issues and long-term growth
prospects have likely been overestimated," - Brokerage
** CMBM down 63% YTD as of last close
(Reporting by Siddarth S in Bengaluru)
((Siddarth.s@thomsonreuters.com;))