Specifications

Alpha 9500 HF Linear Amplifier Operating Manual Alpha Radio Products
Preparing Your Station Product Release 1
DOCNUMBER 9500
Document Issue 1, Revision 7
Page 4–2 June 2009
44
4
Although the amplifier can run when connected to a 110 VAC outlet, you
WILL NOT achieve full-legal-limit output in this case. Rather, you
should not expect more than 1000 W output. For more information on the
limitations of operation when connected to a 110 VAC outlet, see
4.2,
“Limitations of Operation at 90–130 VAC,” page 4–4.
Note that, when the amplifier is plugged in and turned on, it is normal to
hear
the capacitors and band-switch zero themselves and a slight “clunk”
as the transformer comes up to full load.
Step 2 Provide proper airflow.
It is critical that airflow around the amplifier remain unimpeded at all
ti
mes and that the top of the amplifier remain clear of any restrictions.
Maintain at least 3 inches of clearanc
e around the amplifier to allow for
unobstructed airflow (see Figure 4-1).
Figure 4-1
Minimum clearance for proper airflow
If you are mounting the amplifier in a console, ensure that the exhaust air
is properly and fully removed from the console. If outlet air is drawn back
into the amplifier air intake and recirculated, the amplifier gets hotter and
hotter, resulting in degraded performance or even failure. If you are
designing your own console, consider putting in additional fans and/or
ducting to deal with waste heat.
Minimize the possibility of dust or other contamination getting drawn into
o
r falling on the amplifier. Periodically (at least annually) clean the dust
out of the amplifier, paying particular attention to the tube fins. We
recommend the use of compressed air for dust removal.
Step 3 Ready your antenna for 1500 W.