The ratings of three communications equipment stocks are down this week, according to the Portfolio Grader database. 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. RDWR also rates an F in Portfolio Grader’s specific subcategory of Earnings Growth. The stock’s trailing PE Ratio is 45.10. For more information, get Portfolio Grader’s complete analysis of RDWR stock.

EchoStar Corporation Class A’s (SATS) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. 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 trailing PE Ratio for the stock is 73.80. To get an in-depth look at SATS, get Portfolio Grader’s complete analysis of SATS stock.

The rating of Dragonwave Inc. (DRWI) declines this week from a C to a D. 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. For more information, 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.