Regional Jet 900 (CRJ900)
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Distraction; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Human Factors
We were turning on final for a Runway 23.  I called for gear down and flaps 30.  The PM (Pilot Monitoring) read back the instructions; pressed the chimes button; but was interrupted by a call from Tower; which he answered.  Flaps 30 was set; but the gear was not selected down.  I then called for check flight spoilers; flaps 45; which was selected; and the before landing checklist was completed.  At approximately; 1;100 ft. AGL; we received the gear horn; at which point I asked the [Pilot Monitoring] to select gear down; which he did; and to re-read the checklist; and this task was completed (for the second time).  A normal landing was made.Saturation of tasks; short turn to final due to low volume of traffic; high work load; distraction from radio calls from Tower.Both pilots are relatively new to their respective positions.  Neither confirmed that the gear was down upon the first reading of the checklist; and it was imperative that both pilots confirmed the proper gear position at that time.  The primary focus should always be Aviate; Navigate; Communicate in that order.  Communication with Tower could and should have been delayed until the more important flying tasks were completed.  A higher level of diligence should have been engaged with the reading and completion of the before landing checklist.
CRJ- 900 reported a distraction which resulted in First Officer not putting gear down until a gear warning alarm went off.