谁能看懂这些？请说说大概意思
the miracle it's in the gp300.mdf file.
the diffrence between 5t radio and normal radio is in the way wich software interprets the files on hard disk.
attention !!!
the gp300.mdf file has a checksum of 16 bit wich depends of version of gp300.exe software. for software between 1.00.00 and 6.00.00, the checksum of the gp300.mdf file must be 6528. for software 7.00.00 and 8.00.00, these checksum is 3cb1.anyway, use your checksum!
load your mdf file in hexworkshop and compute your checksum first and writ-it down on a paper. unlike 5t version, where in hexa speaking, we found i.e. 438000000 for 438 mhz, the gp300 normal radio has these informations in mdf file for all supported models.
start with adress 458h and finish wih 4eah we'll find the lower and higher stopbands, in reverse hexa notation, consecutivly low and high stoppers, three times.
458h - model uhf 450 - 470 mhz
466h - model vhf 136 - 162 mhz ( direct usable, suitable for our ham band, synthesis loop within look faster )
474h - model vhf 146 - 174 mhz ( very popular, easy to find second hand on public services)
482h - model uhf 403 - 433 mhz ( direct usable, suitable for our ham band, synthesis loop within look faster )
490h - model uhf 438 - 470 mhz ( most popular and suitable for our ham band, synthesis loop within look faster )
49eh - model uhf 465 - 495 mhz
4ach - model uhf 490 - 520 mhz ( rare )
for example, at adress 474h will find 6 interesting bytes:
b405 cc06 b405 cc06 b405 cc06
like i said, three times of two bytes consecutivly.reversing the hexa notation we'll obtain 05b4 06cc 05b4 06cc 05b4 06cc, and with a little transforming ( hexa to decimal ) we could say 1460 1740 1460 1740 1460 1740.
there are three of them because one it appears on description with f2 menu, other it's for message "the range is 136 - 174 mhz bla bla " and one for transmission to radio / rss i think. who cares ...?!
these are the stoppers for some models. try your imagination and compute your values for example between 100 mhz and 200 mhz radio !!!
of course, the synthesis within the radio wouldn't let you to do this hardware ( pll loop will crash or time to pll look will increase ) but don't worry, anything it's possible, but a little bit later !
so, just recompute your needs using the windows calculator in scientific mode, and write them with hexworkshop at proper adress discussed above. don't forget to reverse the hexa values when write !
before saving, go to the top of the file and write some aleator hexa values, overwriting the descriptions of the radios models in that way the hole checksum of the gp300.mdf file remains at initial value ( very important ! ).
at this time you should have a ( very ) large band radio model.
