There are several ways to change the frequency in CTR2. The most obvious one is to simply touch one of the digits in the frequency display. Touch above the center of the digit to increment it and below the center of the digit to decrement it. The digit will be red when incrementing it and green when decrementing it.
The highlighted digit becomes the frequency step for the rotary encoder. Turn the encoder clockwise to increment the step digit while counterclockwise will decrement it.
NOTE: When changing the step digit allow one or two seconds for the change to update the HMI board before turning the rotary encoder.
To directly enter a frequency touch the Keypad button in the center of the second line from the bottom. This will open the virtual keypad. Simply enter all the digits of the new frequency and press Ok. Use the MHz and kHz buttons if entering these values.
Touching a signal on the FFT graph will shift the radio’s frequency in an attempt to tune that signal to the decoder cursor. This is effective when doing ‘hunt and pounce’ during contests. When tuning this way the frequency step will be set to 10 Hz resolution to allow fine tuning the signal to the decoder.
NOTE: The direction of the frequency change is determined by the radio’s Mode setting.
The < and > buttons on each side of the FFT display decrement and increment the frequency from the Favorite Frequency list. This provides an easy way to scroll through a range of frequencies on your list.
The Scan button on the Home page will allow you to specify a frequency range, step, and speed, or a range of favorite frequencies to scan through. NOTE: The scan direction is determined by the color of the frequency step digit. It the digit is green the scan decrements. If it’s red the scan increments. To reverse the scan direction during scanning, touch the upper or lower portion of the step digit.
The >0 button in the lower right corner of the Home page sets all digits below the step digit to zero. For instance, if you were tuned to 7.234.595 with the kHz digit (4) selected as the step digit, touching >0 would change the frequency to 7.234.000.
The P>V button in the lower left corner of the Home page restores the previously tuned frequency to the radio. This is useful when switching radios and you want to return to the frequency and modes set on the first radio. The previous frequency buffer is 10 deep so you can scroll backwards through several previous frequencies. There is however, no scroll forward button (yet).
The last method to change frequencies is with the A/b VFO button. Touching this button allows you to switch to the alternate VFO maintained by CTR2.
Here you can select the other VFO using the select buttons, swap A and B VFOs using the Swap button, copy A to B or B to A using the arrow buttons, and enable Rx/Tx split operation where A VFO is used for the Rx frequency and B VFO is used to the Tx frequency.
NOTE: Because of the slow response of the HMI and display you may find that using your radio’s built-in split mode works better.
Finally, the Lock button in the middle far right side of the Home page locks the frequency and modes. This is handy if you’re using a rotary encoder without detents since they are susceptible to slight bumps.