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What is dual VFO?
Radios that actually have two VFOs are capable of operating on two frequencies simultaneously. Some can operate as a cross-band repeater. This may allow the operator to have a mobile station on a higher frequency which can remotely access the greater HF capabilities of the base station.
What is a VFO used for?
A variable frequency oscillator (VFO) in electronics is an oscillator whose frequency can be tuned (i.e., varied) over some range. It is a necessary component in any tunable radio transmitter or receiver that works by the superheterodyne principle, and controls the frequency to which the apparatus is tuned.
What is a duplex repeater?
Repeaters operate in full duplex mode, because they receive and transmit at the same time. The repeater user is usually operating in half duplex, using two frequencies but switching between transmit and receive.
What is a VFO mode?
In VFO mode, a radio can be tuned to any frequency; this is usually how you select a frequency to be stored in a memory channel. In Memory mode, tuning the radio changes from channel to channel. Turn subaudible tones on or off and change the tone.
What are the 2.4 Ghz channels?
The recommended channels to use on 2.4 Ghz are Channel 1, 6 & 11. As can be seen in the above diagram, these channels do not overlap into each other. In general 2.4 Ghz should be considered a legacy band for older devices that do not support 5 Ghz. It is often more crowded and less performant than 5 Ghz.
What is reverse frequency function?
Many hand-held radios (HTs) and mobile VHF/UHF transceivers support this with a repeater reverse function, typically by pushing a button on the radio. Recall that a repeater re-transmits what it hears on a different frequency. Useful when you want to see if a weak signal is attempting to get into a repeater.
Can a dual VFO be tuned to the same band?
Dual VFO (variable frequency oscillator) radios allow tuning two different frequencies at the same time, typically, one on the left and one on the right. Both VFOs should be able to be tuned to the same band (i.e. both left and right VFOs tuned to 2m band, or both left and right VFOs tuned to the 70cm band).
How is a DX transceiver set to listen on both VFOs?
Most modern transceivers have this capability. The calling stations set one VFO to the DX station’s transmit frequency and adjust the other VFO to be on the receive frequency specified by the DX station (“up 10”). The transceiver is set to listen on the first VFO and transmit on the second VFO.
How many VFOs can I listen to at once in SDR?
Over on the rtl-sdr.ru blog the programmer of many well used SDR# plugins has released a new one which allows you to have up to two extra VFO’s in SDR# (note in Russian, use Google Translate). In order words this means that you can now listen to up to three signals simultaneously if they are in the same swath of live bandwidth.
Is it possible to listen to multiple VFO’s at the same time?
Previously on Windows only the SDR-Radio V2 software was capable of doing multiple VFO’s. Listening to multiple frequencies simultaneously has many uses including the ability to now monitor multiple ACARS, AIS, pager and other data frequencies at the same time.