Collins has superseded the Proline I product line several times with the Proline II, Proline IV, and Proline 21 lines. Most of the Collins Proline I product lines incorporates 1960s and 70s analog technology. Collins has continued to produce some of the Proline I components by special order over the past 30 years however large scale production stopped many years ago. Most of the Collins Proline I components were originally manufactured in the early 1970s. If an operator were to use a 50khz version radio in the position of a 25khz, they would potentially have channel crossover and or an increase in background noise. With the recent mandates and technological advancements in Europe and South America, the requirements for the 50khz versions has diminished. If the ground transmitter or the air to air transmitter was not capable of tighter frequency tolerances, it was possible the 25khz RF selectivity would not allow the receive signal to pass and the aircraft crew could miss critical voice communications.ĭue to the presence of older, outdated equipment in some countries, some manufacturers (namely Bendix/King and Collins) produced VHF comm radios with the 50khz receiver selectivity. In doing so, another problem was introduced. To avoid interference between channels the bandwidth of the RF stages was decreased from 50khz to 25khz. With the evolution and growth of airborne travel and the necessity for more usable frequencies in the VHF communications spectrum, the "channel" spacing became smaller. This does not pertain to the comm selector channel spacing. If you have any questions or concerns regarding this policy, please contact a Southeast Aerospace representative.ĭO-138, Env Category AD/A/JNG/AAAEXXXXX TSO C37b and C38b, class 1, FCC rules and regulations, parts 15 and 87Ĭarbon mic input 0.125 V adjustable, 150 ohmsġ00 milliwatts into 600 ohms with 90% modulationĦ dB (signal + noise)/noise for 3-uV signal 30 dB (signal + noise)/noise for 100-uV signalĦ db= +-8 kHz min, 60 db= +-17 kHz max (for -001 unit) 6db= +-15 Khz min, 60 dB= +-35 Khz min (for -002 unit)Ħ-dB variation from 300 to 2500 Hz, 1000-Hz reference Core acceptance for parts not repaired in-house by Southeast Aerospace is subject to outside repair evaluation turn-times.Īny exceptions to the Billing, Core Conditions, and Core Return policy are subject to written approval by Southeast Aerospace. difference between Outright & Exchange prices) will be billed to the customer.Ĭores will be evaluated for acceptance within 2-4 weeks of receipt for parts repaired in-house by Southeast Aerospace. If no core is returned after 30 days, the core charge (i.e. Any additionalįees incurred by Southeast Aerospace in relation to the transportation of the core return by the customer will be assessed and collected from the customer.Ĭustomer exchange cores must be returned to Southeast Aerospace within 30 days. All transportation costs for the return of the core are the responsibility of the customer. All cores must be returned to Southeast Aerospace at 1399 General Aviation Drive, Melbourne, FL 32935 USA.