External and Internal Power
As I mentioned elsewhere, my Yaesu FT-897D is equipped with the optional internal battery packs.
When operating on the internal batteries, the 897 is capable of driving 20 watts out.
If the 897 is connected to an external battery pack as it is in this photo, that being my 30 caliber power-can located just to the left of the transceiver, then the radio is capable of driving the connected antenna with 100 watts out.
Although the 897 when operated with one of the internal battery packs is only capable of driving the antenna with 20 watts, the plus is the fact that the radio draws less current at idle while running on the internal batteries, allowing a longer operating period before the batteries require recharging.
With the radio is connected to the 30 caliber power-can, and even though the radio is dialed back to 20 watts out, the radio still draws more current at idle than when being run on the internal batteries.
Yaesu designed the FT-897D circuitry in this way to make the 897 a milliamp sipping transceiver when operating on the internal batteries.
The FT-897D is proving to be a terrific choice for operating portable on any given day, especially when your off the grid, and battery charging is being done through the use of a solar panel.
Click on the photo for a closer look.....