Icom is 100% duty cycle for RTTY
Yaesu 450D Manual says 1/2 to 1/3 full output for RTTY
Looks like an obvious choice to me. I have run several Icoms on RTTY at 100
watts full output with no problem - 751A, Pro2 and Pro3 - no problem but I did
blow air across the top of the radio to move some of the heat from around the
rig - but not right into the radio - just across the top so as not to interfere
with the designed airflow inside the case.
Consider saving a bit longer and get a little better Icom - 7200 or better - I
haven't been impressed with the 718 - It's a beginners rig but still better in
many ways than the 450D. My buddy has a 450D and it seems very sensitive to RF
kicking it off line - just locks up (not the power supply - the rig). de W4PJW
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