This week, the ratings of three communications equipment stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Radware (RDWR) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). Radware develops, manufactures and markets application delivery and network security solutions that provide end-to-end availability, performance and security of mission critical networked applications. For Portfolio Grader’s specific subcategory of Earnings Growth, RDWR also gets an F. The stock has a trailing PE Ratio of 46.50. To get an in-depth look at RDWR, get Portfolio Grader’s complete analysis of RDWR stock.

This week, EchoStar Corporation Class A (SATS) falls to a D (“sell”), worse than last week’s grade of C (“hold”). EchoStar engages in the design, development, and distribution of digital set-top boxes and related products. The stock gets F’s in Earnings Growth, Earnings Momentum and Margin Growth. The stock’s trailing PE Ratio is 42.40. For more information, get Portfolio Grader’s complete analysis of SATS stock.

This week, Dragonwave Inc.’s (DRWI) rating worsens to a D from the company’s C rating a week ago. DragonWave is a producer of high-capacity packet microwave solutions which support networking and other data transmission needs. The stock gets F’s in Equity and Cash Flow. Shares of the stock have been changing hands at an unusually rapid pace, up 442.3% from the week prior. To get an in-depth look at DRWI, get Portfolio Grader’s complete analysis of DRWI 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.