以下是在网上找的有关资料：
yaesu ft-450扩频步骤
扩频行为有可能和某些国家法律相抵触，并且该行为未经验证，也可能造成永久性的机器损坏。转发本文只为技术参考。
yaesu ft-450扩频步骤
mars mod for ft-450
important notice
this information is solely for use by licensed members of mars (military affiliate radio system) or cap (civil air patrol), and release to any other party is not authorized. use of any amateur radio product outside of the amateur band is at the users own risk, and no guarantee of compliance with specifications outside the amateur bands is expressed or implied. the limited warranty does not cover damage caused by any attempt to modify an apparatus for out-of-amateur-band operation, nor does the limited warranty cover damage to components that may result from out-of-amateur-band use.
new tx freq range: 1.8-30 mhz.
modification procedure: units lot 07 and above the jumper jp4002 must be removed.
disconnect the power form the radio. remove the front panel & the large rf shield to access the control pcb. locate the solder jumper jp4002 as shown in the attached photos. use professional de-solder tools and technique to remove the solder and open the contacts. reassemble the radio and power cord.
press and hold [att/ipo], [nb], and [agc] keys, while turning the radio on. "smadjo" will be displayed on the lcd as the memory address at the lower right side of the display.
rotate the [dsp/sel] knob ccw to show "type" at the memory address on the display.
briefly, press the [f] key, and confirm the "f" icon lights. while the "f" icon is displayed, press the [nb] key. "t" will be displayed at the right end of the frequency display.
press and hold the [f] key for 3 seconds. a long beep will sound, the screen will clear and then the frequency will be displayed on the lcd. the procedure is complete.
to return the radio to normal ham band mode, do procedure (1) and (2) as above, and then follow steps (3) and (4) below.
briefly, press the [f] key, and confirm the "f" icon lights. while the "f" icon is displayed, turn the vfo knob to select "a" as displayed at the right end of the frequency display.
press and hold the [f] key for 3 seconds. a long beep will sound, the screen will clear and then the frequency will be displayed on the lcd. verify the radio will transmit in the amateur bands only. the procedure is complete.
扩好后的发射频率范围1.8~30m
扩频位置： 断开 jp4002 跳线端。
关闭电源，拆下前面板，拿掉屏蔽罩看到控制板，把 jp4002 跳线断开。
装复机器，按住[att/ipo], [nb], [agc] 键开机。 "smadjo" 会显示在屏幕上。
旋转[dsp/sel]钮到 显示"type"。
按一下[f] 键, 确认 "f"图标亮起。 当"f" 图标亮起,按下 [nb]键。 "t" 将会显示在频率显示最右边处。
按住[f] 键三秒钟，一声长声后, 屏幕会回复频率显示模式，操作结束。
yaesu ft-450的隐藏菜单
by pressing and holding the following keys while powering on the radio you will gain access to the hidden menu of the yaesu ft-450.
press and hold att/ipo, nb and agc buttons at the same time and press the power button and power on radio while still holding in these buttons, and to change the setting you simply use the dsp control (rotary) to select the item you want to change and use the main vfo knob to alter the independant settings of your choice.
(to change the color of your screen, change the settings of ledint1 ledint2 and ledint3, will do most colors. to exit the hidden menu simply press (f) function key. in some radios the radio might also do a full reset. so if you go in there and change anything in there and if you ruin a perfectly good radio no one is to blame but you按住几个键开机，即可进入隐藏菜单模式。按住att/ipo, nb ， agc 这三个键开机，然后就可以用dsp键控制隐藏菜单，用vfp钮调整你想要更改的选项。
比如说更改屏幕颜色，修改ledint1 ledint2 ledint3的参数。推出隐藏菜单模式，只需按一下f键。
