The FT-897D is a very efficient transceiver for portable use, perhaps because it is designed for use with battery power in mind. As I recently purchased an Icom IC-7200 to replace it for HF use whilst portable, I thought I would do some tests on the efficiency of them both, and also my FTDX1200 for comparison. The IC-7200 is comparable to most other HF desktop transceivers, using up to 20A with a 100W carrier. See the plotted chart below:
This table shows the test results. All tests into a 50Ω dummy load, at 13.8v on 7MHz:
|Transceiver||RX||TX 5w||TX 20w||TX 50w||TX 100w|
|FT-897D||0.6A||3.8A (9.5%)||6.3A (23%)||9.9A (36.6%)||13.4A (54%)|
|IC-7200||1.1A||7A (5.2%)||10.3A (14.1%)||14.7A (24.6%)||19.5A (37.1%)|
|FTDX1200||1.6A||8A (4.5%)||11.2A (12.9%)||15.1A (24%)||19.5A (37.1%)|
It can be seen that the IC-7200 is ever so slightly more efficient than the FTDX1200, but neither is anywhere near the efficiency of the FT-897D. It will be interesting to see how the new Yaesu FT-991 compares to the FT-897D! In all cases, the more RF power you use, the more efficiency you are getting 😉
I have a 100AH Leisure Battery which still provides enough power for an afternoons operating with the IC-7200 at full power, so that will do me, although a bit more efficiency is always nice!