Alpha 9500 HF Linear Amplifier Operating Manual Alpha Radio Products
Setting Up the Amplifier Product Release 1
DOCNUMBER 9500
Document Issue 1, Revision 7
Page 5–10 June 2009
55
5.5 Set the Input Drive
You must set the transceiver output power properly. Virtually all damage
to date has resulted directly from severe overdrive. The amplifier requires
50-W drive for full rated output.
Damage caused by applying several-times-rated drive power to the
amplifier is not covered under warranty. Fortunately, most modern
transceivers maintain quite consistent output from band-to-band and
mode-to-mode when set up properly.
Procedure 5-5 Set the input drive
Step 1 Place the amplifier in standby mode on the desired band.
Step 2 Start with the minimum power and then adjust the transceiver output to
around 20 W. You can read the power on the 7-segment display.
CAUTION! It is not sufficient to set only the transceiver POWER or
RF PWR control. Several popular transceivers can generate RF
spikes of 200–300 W. Control of these spikes typically is done with a
knob labeled DRIVE (IC-781, FT-1000) or PROCESSOR OUT (TS-
940, TS-950). On SSB, when speech processing is not used, adjust
the MIC or MIKE controls. See the user manual for your particular
transceiver.
5.6 Connect the Transceiver
Procedure 5-6 Connect the transceiver
Step 1 Connect the transceiver.
The following is a list of popular transceivers and considerations for their
connection to the amplifier. For advice on other transceivers, contact
Alpha Radio Products as described in
Chapter 1, “Introduction.”
Table 5-1 Popular transceivers
Transceiver Connection and keying information
Icom RF —
T/R — Connection with the “Send” jack. For
information, see the transceiver user manual.
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