VCC is 3.3V. Make sure your external module is OK with that supply voltage. Some modules are 3.3V only, some are 5V only and some are OK with either. Check your specs.
IMO it's a bad idea though. The internal mod works just fine, even in vehicles. Getting better reception isn't a very compelling reason to move the antenna outside the scanner. Even the Ladybird (the worst-performing module I've tested) has no trouble keeping satellite lock under the seat in a SUV parked in my carport, with the antenna sandwiched between the scanner and the floor. Given that Location Control only needs a location update every few miles or so, there isn't much justification to go external antenna for performance reasons.
As to the testing issue, I've done dozens of hours of testing. Every scanner I mod gets a minimum of 12 hours of test run with the GPS on to make sure that the GPS module and MAX3232 chip do not fail prematurely, and that sensitivity is not compromised by RFI when the GPS is running.
If you have questions about doing an internal mod, answering them is one of the stated purposes of this thread.
IMO it's a bad idea though. The internal mod works just fine, even in vehicles. Getting better reception isn't a very compelling reason to move the antenna outside the scanner. Even the Ladybird (the worst-performing module I've tested) has no trouble keeping satellite lock under the seat in a SUV parked in my carport, with the antenna sandwiched between the scanner and the floor. Given that Location Control only needs a location update every few miles or so, there isn't much justification to go external antenna for performance reasons.
As to the testing issue, I've done dozens of hours of testing. Every scanner I mod gets a minimum of 12 hours of test run with the GPS on to make sure that the GPS module and MAX3232 chip do not fail prematurely, and that sensitivity is not compromised by RFI when the GPS is running.
If you have questions about doing an internal mod, answering them is one of the stated purposes of this thread.