The transceiver can heat up, especially if the antenna is not well-matched. Such a high duty cycle can be an issue with digital modes because digital transmissions can last longer than typical FM voice contacts. When you are transmitting digital FM, voice FM, or digital single-sideband (but unlike single-sideband voice), your transmitter is delivering power all the time. Power: FM mode has a "100% duty cycle".But this course is explicitly targeted to FM-mode use in order to include the many hams whose equipment is not capable of single-sideband operation.) fldigi can also be used in "digital" or "USB" mode on the VHF/UHF bands. (Note: fldigi is widely used on the HF bands, and there the transceiver would be set to "digital" or "USB". Mode: Your transceiver must be set to "FM" mode, not to "WFM", "AM", "digital", "packet", "USB", or "LSB".This is intended for the sorts of digital modes you see on HF." This describes fldigi's modes perfectly.) (A NCPA band plan footnote for this frequency reads, "For digital modes other than AX.25 packet. A frequency within a NARCC digital sub-band that is designated "miscellaneous digital" by NCPA.Frequencies (channels) designated "simplex" by NARCC.In my group of fldigi experimenters, in late 2019, we have used the following kinds of frequencies: However, there is no reason why digital communications cannot be made on frequencies or "channels" designated "simplex" or even on repeaters (with the assent of the repeaters' trustees), as FM transmissions are expected there. Within the sub-bands marked "digital" or similar in the NARCC band plans, the Northern California Packet Association ("NCPA") provides band plans for digital use. NARCC sets all 2-meter frequencies at or below 144.300 aside for "weak-signal" transmissions, which excludes FM. In Northern California, band plans are provided by the Northern Amateur Relay Council of California ("NARCC"). Local band plans recommend specific usage patterns on the VHF and UHF bands, and they vary by locality.US Federal regulations prohibit anything except CW at or below 144.100 MHz on the 2-meter band and at or below 50.100 MHz on the US 6-meter band, but otherwise are OK with digital emissions of the sort fldigi produces anywhere on the VHF/UHF bands (50 MHz and up in frequency).Frequency: tune your transceiver to a VHF or UHF frequency on which FM digital signals will comply with Federal regulations and with local band plans.Technician or higher Amateur Radio license? Yes.Computer with installed fldigi software? Yes.These settings apply to the use of any interface method. In this brief exercise, you will configure your transceiver to work properly with fldigi in the context of this course, using FM mode on the VHF and UHF bands. If you have a Tigertronics™ SignaLink interface device, you will go on to the later exercises in this step, configuring that device (Exercise 1.4.4) and using it on the air (Exercises 1.4.5 and 1.4.6). Then you will operate fldigi on the air with yourself as the interface between your transceiver and your computer (Exercises 1.4.2 and 1.4.3). In this step in the course, Step 1.4, you will first configure your transceiver (Exercise 1.4.1). You may be happier, however, using an electronic interface, with which audio travels by cables and PTT (putting the rig into transmit) is automatic. Or, if you simply don't want to get into this issue right now, you can also continue with the next step this step is not a prerequisite for anything that follows.Īn "interface" can be as simple as your hand or a shelf or bracket holding an "HT" (handheld transceiver) in the correct position and your fingers pressing and releasing the PTT (push-to-talk) button at the correct times. If you don't meet those requirements, you can skip Step 1.4 and continue with the next step. This step of the course requires that you have an Amateur Radio license and an Amateur Radio transceiver. switching the transceiver between receive and transmit at the correct times.moving audio effectively between the transceiver and fldigi, and.The only absolutely necessary elements of that "interface" are: This step of this course, Step 1.4, deals with the "interface" between your radio transceiver and the device on which you are running fldigi. next page Step 1.4: Interfacing your transceiver and fldigi device Background.
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