This week, four communications equipment stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This week, MRV Communications, Inc. (MRVC) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). For more information, get Portfolio Grader’s complete analysis of MRVC stock.

Plantronics, Inc. (PLT) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. Plantronics designs, manufactures, and markets lightweight communications headsets and headset accessories and services. For more information, get Portfolio Grader’s complete analysis of PLT stock.

The rating of Novatel Wireless, Inc. (NVTL) moves up this week, rising from a C to a B. Novatel Wireless provides wireless data modems and software for use with handheld computing devices and portable personal electronics. For more information, get Portfolio Grader’s complete analysis of NVTL stock.

EchoStar Corporation Class A (SATS) boosts its rating from a C to a B this week. EchoStar engages in the design, development, and distribution of digital set-top boxes and related products. For more information, get Portfolio Grader’s complete analysis of SATS stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.