Allowable frequencies of the radio and RT Systems programmers
Radios are designed with information in their little brains that tell them where to operate. For example: your 220MHz radio may operate from 220MHz to 240MHz, well withing the US Ham band, or may be designed to operate from 240MHz to 260Mhz, still in the 220MHz band, just in a frequency range that is not in the American Amateur Ham band. You were not taken advantage of when you purchased this radio, you are just from the wrong part of the world for it. The seller did not know your plans for its use and sent you the radio you ordered.
The manufacturer designed the radio to operate in a certain frequency range. The electronics of the radio are sized and designed to handle frequency calculations within the given range. The radio is not designed to operate well outside that range. Other program may let you enter frequencies outside the operating range and design of the radio without regard to the radio's specs. Your results could be poor performance or even damage to radio. While most radios can handle slight changes... how far do you plan to go? In the example above, do you plan to put in and operate on a 440 MHz frequency just because you can get software to force it into the radio??? I can only guess at how poorly that will end up.
RT Systems programmers are designed to respect the frequency information as it comes from the radio. You will see this in the allowable frequencies of the programmer (ie., you won't be able to enter a frequency outside the radio's design limits). We do this to protect your equipment. So, since you want a $20 HT to work fairly well... respect it's design and work within its specifications.
Two things to know about the RT Systems programmers...