and portable use.
I use it also as an exciter (144 MHz) for
my 23cm transverter (DB6NT), which is
followed by MOSFET poweramplifiers.
These amps are very sensitive against
overloading in the frontend.
Knowing this, it's a good idea to check
the 897-power regulation in case of
reduced output.
Output power is assigned in menu 75 on
144 MHz from 50 to 5. This indication
can be aligned to 'Watt' by the 'extra menu'.
In my rig I aligned '50' to 50 Watt and
'5' to 2 Watt output.
I connected the rf-output of the 897 to a
Bird wattmeter model 43 with an attatched
dummyload which has a monitor output
equipped with a diode. This monitor voltage
was processed by a digital storage unit and
displayed by a Tektronix 2335 oscilloscope.
Then I keyed with dits.
See picture on the right for different
output power.
My rig is a 'FT897' without 'D' (but equipped
with a DSP plugin), bought in december 2005.
No garantee for other rigs!
For my transverter I decided to use 50 Watt
output through a 10 dB power attenuator.
This is 'brute force' but faile safe.
In the receiving path I need -10dB anyway
because the output from the transverter is to
high with G4DDK preamp.
See how to build a
10 dB power attenuator. Click here.
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