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The hex file does not incorporate fuse settings. You have to set fuses in your programmer software when you flash the chip.
As I said on the PTT mod article though... this is unlikely to ever be an issue. Changing the fuses makes the startup 65ms faster. I suppose if you:
1) Used IC3 pin 11 to key an external amplifier AND
2) Did NOT perform the pullup resistor mod detailed at http://www.qrp-labs.com/qcx/qcxmods/ptt.html AND
3) Have some power supply anomaly that initiates a spike on power-up in some circumstances
Then if ALL three of those match your situation, then there is a POSSIBILITY that changing this fuse to eliminate the 65ms delay at startup MIGHT reduce the probability that you don't blow a PA transistor with a self-destructive spurious spontaneous oscillation.
There's a lot of conditions and IFs and MAYBEs so really changing this fuse is not important at all. I am mostly just informing people that it is harmless to remove this 65ms delay by changing the fuse and that we will supply QRP Labs programmed chips like this from now on.
73 Hans G0UPL
On Wed, Dec 4, 2019 at 12:53 PM Andrea Massucco IZ1IVA <ml@...> wrote:
> Il giorno 03 dic 2019, alle ore 12:35, Hans Summers <hans.summers@...> ha scritto: