Communications with an emission of F1B/J2B...

Question 1 / 270701C1iwbwb01ctpZMZi2ao

Question 1 of 270701C1iwbwb01ctpZMZi2ao

Communications with an emission of F1B/J2B would typically have a channel spacing of:

Back

Question 1 of 27070

Q

Communications with an emission of F1B/J2B would typically have a channel spacing of:

🔍 Key Concepts

• Understand what the emission designator F1B/J2B means in ITU radio regulations (type of modulation and nature of signal) • Recall typical channel spacing used for narrow-band direct-printing (NBDP) and telex-over-radio services in the MF/HF maritime bands • Think about how much bandwidth these narrow-band data modes usually occupy compared with normal voice (F3E/J3E) channels

💭 Think About

• Is F1B/J2B generally a narrower or wider signal than voice emissions used on standard marine VHF channels? • What channel spacing is commonly associated with narrow-band telegraphy or data modes in HF maritime bands? • Which of these options looks more like a realistic spacing used in published MF/HF telex or NBDP channel plans?

✅ Before You Answer

• Verify the typical bandwidth of narrow-band direct-printing (NBDP) emissions in ITU/IMO documentation • Compare that bandwidth to the listed channel spacings in MF/HF maritime frequency tables • Eliminate options that are too small to be practical or too large for efficient spectrum use for a narrow-band data signal

Question 1 of 27070

Q

Communications with an emission of F1B/J2B would typically have a channel spacing of:

A

0.3 kHz

B

0. 5 kHz

C

2.8 kHz

D

3.0 kHz

Question 1 / 270701C1iwbwb01ctpZMZi2ao

Question 1 of 270701C1iwbwb01ctpZMZi2ao

Communications with an emission of F1B/J2B would typically have a channel spacing of:

Back

Question 1 of 27070

Q

Communications with an emission of F1B/J2B would typically have a channel spacing of:

🔍 Key Concepts

• Understand what the emission designator F1B/J2B means in ITU radio regulations (type of modulation and nature of signal) • Recall typical channel spacing used for narrow-band direct-printing (NBDP) and telex-over-radio services in the MF/HF maritime bands • Think about how much bandwidth these narrow-band data modes usually occupy compared with normal voice (F3E/J3E) channels

💭 Think About

• Is F1B/J2B generally a narrower or wider signal than voice emissions used on standard marine VHF channels? • What channel spacing is commonly associated with narrow-band telegraphy or data modes in HF maritime bands? • Which of these options looks more like a realistic spacing used in published MF/HF telex or NBDP channel plans?

✅ Before You Answer

• Verify the typical bandwidth of narrow-band direct-printing (NBDP) emissions in ITU/IMO documentation • Compare that bandwidth to the listed channel spacings in MF/HF maritime frequency tables • Eliminate options that are too small to be practical or too large for efficient spectrum use for a narrow-band data signal