The typical concerted activities are........
repeated adi and obv conflicts/divergence along with one marketmaker trade executions being in-between the bid/ask.
Often this one marketmaker will post a bid opportunity but often retracts them and will keep his ask in-between the uppermost ranges of bid/ask. This will appear somewhat normal until you find he seldom, if ever, executes a bid execution. His executions are almost always between the bid/ask over and over. He is selling a very large position at a discount relative to the other marketmakers.
You cannot tell if these executions are buys or sells so this repeated difference generates the conflict/divergence in the chart. The math in the chart notes a falling price from an increased ask or vice versa, thus resulting in printed conflict.
You will also see a noticeable escalation in volume when convertibles and pipes become part of the daily volume activity. Volume will have a flat line, then spike and remain elevated until their deeds are complete...... often lasting several months and years...... commonly sending the stock in a downward spiral.
The appealing thing about these kinds of stock..... they will usually offer a campaign of sorts to pump the share price and reload the former process. Being able to recognize these pump episodes can produce some attractive gains, but don't be a pig after getting involved.
Good luck
e