Way out of my depth on this topic - I know nothing about radio tech and circuit boards.
Here's my scenario;
On motorcycle trips, a mate and I use helmet mounted bike-to-bike communications.
The current product uses a freq range from 462.550 MHz to 467.7125 MHz. What I'd like to be able to do it alter the frequency range to 476.425 - 477.4125 MHz (a more commonly used range).
Im hoping someone can shed some light on the topic.
The units we use certainly aren't sold as an 'adjustable frequency' unit, so it's definitely a custom job.
Can you provide a bit more detailed info on the radios..such as the make/model and a schematic?
The radios "may" be able to work the channels your wanting, but the new channels are about 14Mhz higher from the current frequencies. The front ends may go that high but problem is without having the schematic to see the other stages, those other stages..ie drivers and final, may not go that high without some very serious changes in components in and around those areas. UHF stuff isn't that easy to swap frequencies around especially by as much as 14Mhz. There also may be foil pattern inductors and coupling which of course, are cut for the specific band of intended operation and may be the biggest road block to modifying them.
Peace!
K-ROCKS RadioOne
ZeroPointRadio
AM Stereo 1670
FM Stereo 92.1
So it sounds like your two way radio uses FRS channels 1 through 14 (462.5625 - 467.7125) on the US band and you want to switch to the Australia band.
The only thing I can imagine would work would be to look up the model number of your radios and see if there is some simple soldering pad/jumper in them to allow you to use them on the Australian FRS frequencies. Sadly most FRS radios are next to impossible to modify so easily. Those tiny SMD parts inside on double sided circuit boards make for a real mess when modding them in my experience.