Kristam Targett, 25, pleaded guilty in the Launceston Supreme Court on Friday to offences including aggravated burglary and aggravated assault.

Yesterday, Justice Robert Pearce convicted and jailed Targett for 15 months, backdated from May 19, and suspended the last six months for two years.

"Because I have suspended part of the sentence and because of the seriousness of the crime of aggravated assault, I order that you are not eligible for parole," Justice Pearce told Targett.

"I consider that, subject to remissions, nine months is the minimum term of imprisonment that you should serve, taking into account all of the circumstances of the offence and the goals of condemnation, prevention, punishment and deterrence."

Targett had also pleaded guilty to having recklessly discharged a firearm, having possessed a firearm while unlicensed, having possessed ammunition while unlicensed, and having breached a police family violence order.

The offences occurred at Ravenswood at 4.20am on May 14, when Targett donned a mask, armed himself with a loaded .22 sawn-off rifle and broke into the woman's house.

He accused the complainant of cheating on him, physically assaulted her, waved his firearm around her, shot at various objects inside the house and called the woman obscene names.

Targett then followed the complainant into the street and discharged his firearm again.

Justice Pearce noted that Targett's judgment was affected by methamphetamine at the time, but that was no excuse or mitigation.

He noted that Targett had previously been fined for an assault against the same complainant, which happened about three weeks before his new crimes.

"Conduct of this nature is to be abhorred and must be condemned by the court," Justice Pearce said.