For bands A to D the DX-160 local oscillator frequency is
designed 455 kHz above the receiving frequency. (IF amplifier
frequency is designed 455 kHz.)
For example at 10.000 MHz signal, the local oscillator
frequency is 10.455 MHz.
This applies for bands A to D.
Band E uses 455 kHz on the lower side of the receiving
frequency. It also receives the signal when the local oscillator
frequency plus receiving frequency equals IF 455 kHz. This is image
reception.
For example image frequency on Band D at 10 MHz is 10 + 2 X
0.455 = 10.910 MHz.
But for band E at 28 MHz, IF is 28- 2 X 0.455 = 27.090 MHz
This 27.090 MHz is close to the 28.000 MHz that we want to
receive.