[Yaesu] FT-1KD ATU problem

[John Nelson]

>If the match the transmitter is look at is not 1 to 1, and it probably
isn't, the increase in power from the 1000 would also see an increase in the
reflected current.<

Indeed. As I believe I mentioned, however, the phenomenon manifests itself
when operating into a dummy load as well as into the antenna.

>Very common when using some sort of linear amp. If you set-up the tuner
using just the drive from the rig and then switch in the linear invariably
you will see an increase in the SWR and therefore need to retune.<

Not the case with my Alpha 87A, which looks more or less like 50ohms
resistive on all bands except 28MHz where there is a small amount of Xc.
Both the '990 and the 1KD transmit perfectly happily into this amplifier
with or without the auto ATU in circuit. However, the 1KD does not deliver
the set power with the ATU in circuit unless it is re-tuned.

Thank you for your reply, but I believe there is a little more to this
problem than mere mismatching.

73 John
GW4FRX