This week, the overall grades of three communications equipment stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Radware (RDWR) earns an F (“strong sell”) this week, moving down from last week’s grade of 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 trailing PE Ratio for the stock is 46.40. To get an in-depth look at RDWR, get Portfolio Grader’s complete analysis of RDWR stock.

EchoStar Corporation Class A (SATS) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. 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 has a trailing PE Ratio of 399.50. For more information, get Portfolio Grader’s complete analysis of SATS stock.

Dragonwave Inc. (DRWI) gets weaker ratings this week as last week’s C drops 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. 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.