Police allege one-time Nomads chapter president Mohammed Nchouki knew they were listening in on his phone calls when he unleashed what a prosecutor has called "an obsessive, uncontrolled, vindictive rant".

But the builder's barrister has suggested the 40-year-old may just have been "blowing off steam", with no evidence to show he knew for sure his phone was tapped.

Mr Nchouki is making a fresh bid for bail in the ACT Magistrates Court, having failed in his first attempt following his June 1 arrest.

He was out on bail accused of serious offences, including conspiracy to pervert the course of justice, when one of his phone calls was lawfully recorded on May 23.

"Brother, you got to understand that f---en dog who is listening to us right now, that [officer's name], that c---sucker, I'm going to find his wife and I am gonna f--- her, you understand?" Mr Nchouki told his brother, Jomal Nchouki.

Jomal, who is accused of drug trafficking, had earlier complained about an officer involved in arresting Mohammed on the initial charges last year, believing the officer was trying to make him look like "a snitch".

In the five-minute phone call, Mohammed Nchouki swore dozens of times, repeatedly told his brother not to worry about rumours, spoke of "crushing skulls" and made homophobic comments, among other things.

At one point, while talking about the police officer in question, he remarked: "You know I'm talking to you, you f---ing gay c---, while you are listening to this."

"I'll cave his f---en head in when I see him, you know what I mean?" he also told his brother in the recording.

Mr Nchouki has been charged over the call with threatening or intimidating a witness in judicial proceedings, threatening to inflict grievous bodily harm, using a carriage service to threaten serious harm, and using a carriage service to menace, harass or cause offence.

The 40-year-old has pleaded not guilty.

In court on Friday, prosecutor Patrick Dixon said Mr Nchouki had been aware police were monitoring his calls because a brief of evidence served on him in relation to the earlier charges made that apparent.

Mr Dixon, opposing bail, said the police officer discussed in the call had not listened to it "in real time", but had heard it after being alerted to its contents by a colleague.

Defence barrister Steven Whybrow described the matter as "unusual" and argued the prosecution had "an inherently weak case".

He wondered aloud whether the call contained evidence of serious threats, or just a man "blowing off steam".

Mr Whybrow put it to an investigating officer, Senior Constable Aaron Bugno, that police phone taps might have been revealed to Mr Nchouki in a brief of evidence in February, but the builder did not know the bugging was still happening in May.

Senior Constable Bugno said while he did not personally know of any officer telling Mr Nchouki his calls were still being recorded, the contents of the May 23 conversation and another intercepted exchange involving Mr Nchouki's wife appeared to show the builder was aware at the time.

The senior constable said it was he who had listened to the recorded call a day after it was captured and informed the officer named by Mr Nchouki.

He told the court he had immediately alerted his supervisor and steps had been taken to ensure the officer's safety.

Magistrate Louise Taylor is expected to make a decision on the bail application when the case returns to court this Wednesday.

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