Dave . . .
On Mon, 25 Mar 2024 11:06:14 -0700, "David" <ns8s@...> wrote:
I have acquired a pristine, working TS-570S from Japan and see it has the power limit set to 50W. Does the service menu item 18 allow this to be set at the standard, 100W limit for USA?
Hopefully someone here has a way to get that radio to put out 100 watts.
However, based on recent Icom radios purchased from the Japanese market at a
lower price, then brought to the USA for use, those radios are hardwired so the
frequencies and power limit for Japan can't be changed in firmware or hardware
(by cutting diodes in a matrix).
I hope that is not the case with the 590 you have, and your radio is older than
the ones I've seen being discussed recently in Icom forums, so maybe it can be
changed.
The other thing I'll mention is that your final transistors may be only able to
handle 50 watts. You might check the transistors called out in schematics for
both the Japanese and the USA models to see if they use the same transistors. If
all you want to do is to change the output power, and if the output transistors
are the same in radios for both markets, you might be able to rework the driver
and/or output stage to put out more power. It might be something as simple as
changing some resistors.
Donald KX8K
----------------------------------------------------
Some ham radio groups you may be interested in:
/g/ICOM /g/Ham-Antennas/g/HamRadioHelp /g/Baofeng/g/CHIRP
David