Specifications

FMN MODE
What is FMN?
FMN is the narrow FM mode having a maximum deviation of +/-2.5 kHz. This mode is
activated by turning NAR ON (Operating Function Row 7, Key C) when in the FM mode.
The display will show FMN. In the US, there is no specific FCC Rule that limits the
bandwidth used for phone modes; however, Rule 97.101(a) does require that the amateur
follow good engineering and operating practices. It is common practice to use the narrow
mode on 10-m FM for example. (Tnx to G0EHX for noting the FMN.)
15/04/01
FUSE
What is a "pico fuse" and what size is appropriate to use with the battery pack?
A pico fuse is a small fuse that can be used in the battery leads to protect the battery and
the radio from damage should a short circuit occur. A 3 A fuse is suggested. The FT-817
draws 2 A during high-power transmissions. A 3 A pico fuse is rated to blow at 3 A in 4
hours and at 6 A in 5 seconds. In a recent test by W4WB and N4BK, a sample 3 A pico
fuse blew at 5.1 A in just about a second or so. Pico fuses may be found in many
electronic supply stores. One source is All Electronics Corp. (www.allelectronics.com). See
also TOPIC - BATTERIES.
08/04/01
GREEN WIRE
What is the purpose of the green wire modification?
See also TOPIC - BATTERIES. The cable from the FT-817 to the FBA-28 battery holder
contains five wires, one of which is green, two that are black, and two that are red. The
green wire needs to be connected to the FBA-28 when alkaline batteries are being used.
Should you desire to put NiCd or NiMH cells in the FBA-28 battery holder, then disconnect
the green wire. When the FT-817 is powered from a 13.8V power supply, the FT-817 will
charge the batteries for the time set in the BATT-CHG menu option and then drop to trickle
charge. (NOTE: The red wires (positive leads) are connected together in parallel and in a
like manner, the black wires (negative leads) are connected in parallel. This is required
because the Molex connector used is rated at 1 A per pin and the FT-817 is specified at a
maximum current draw of 2 A.)
16/06/01-R
IF CONTROL
Is there a variable IF width control?
NO. However, you can see some adjacent-frequency interference reduction by using the
IF shift control with the frequency control. This creates a makeshift narrow filter that can
help some when working CW and you don't have the optional CW filter.
IF CONTROL
Can the IF be shifted?
YES. Use it to move an interfering signal out of the passband. See the manual for
instructions to operate the IF shift control.