Alpha Radio Products 9500 User manual

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ALPHA 9500 Interim OPERATING MANUAL
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ALPHA 9500
HF LINEAR AMPLIFIER
Interim
OPERATING MANUAL
© 2007 Alpha Radio Products, Inc
All rights reserved
Specifications subject to change without notice

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ALPHA 9500 Interim OPERATING MANUAL
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Table of Contents

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1 Introduction
1.1 General Description
Congratulations on your purchase of a professional quality Alpha 9500 amplifier! With proper
installation and care, you can expect to enjoy your Amateur Radio hobby with this amplifier
improving your signal for many years to come. Please study this manual carefully before
operating your amplifier for the first time.
The Alpha 9500 is a self-contained manual tune HF linear power amplifier capable of continuous
operation at 1500 W peak power output on SSB, keyed CW, SSTV, RTTY, digital modes or FM, with
no time limit.
Other Alpha products available to enhance your use and enjoyment of the 9500 amplifier include:
• Alpha 2100 full 1500-watt rated 50-ohm dummy loads and
• Alpha 4500 series SWR meters / Wattmeters
See our web site at www.alpharadioproducts.com or call 303-473-9232 for further information.

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1.2 Amplifier Capabilities
CAUTION:
It is extremely important to thoroughly review the Installation and Operation
sections of this manual before attempting to use the Alpha 9500. Failure to do so
could result in serious damage not covered under warranty.
• Continuous RF Output. The 9500 is capable of 1.5 kW continuous RF output on all commonly
used modes and on any authorized amateur frequency from 1.8 to 29.7 MHz.
• Compatibility with popular amateur transceivers and exciters. The 9500 requires approximately
50-65 W peak RF drive for 1.5 kW output.
• Capable of full CW break-in, QSK and all digital modes when used with any appropriate
transceiver.
• Protective functions are built in. The control system incorporates protective functions that
minimize the probability of accidental damage to the amplifier or its power tubes. In most cases,
when one of the protective functions is“tripped,”the amplifier will go to Standby.
• USB and Serial interface allow for remote operations,diagnostic and firmware upgrades.
1.3 Shipping Information
The Alpha 9500 amplifier ships in two heavy-duty cardboard cartons. One carton holds the power
transformer and weighs 43 lb (20 kg) and the second carton contains the amplifier and weighs 39 lb.(18
kg). Both of these cartons are mounted on a wooden pallet and strapped down for secure shipping.
Alpha recommends that you retain the pallet and the cartons after installation in the unlikely
event that you need to ship the unit later. Contact Alpha at 303.473.9232 for shipping advice and
assistance.
1.4 Safety Information – Installation and Operation
• Make sure the Alpha 9500 is located where there is good air circulation all around and on
top of the cabinet. The unit may become hot during operation.
• The Alpha 9500 weighs approximately 69 pounds when the transformer is installed. Use

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proper lifting techniques and two people when moving the amplifier.
• The Alpha 9500 is designed to meet international safety standards and FCC regulations.
However, one should always remember that the equipment works with high voltages that
can be LETHAL!
This operating manual holds information, cautions and warnings that must be followed to ensure
safe installation and operation. Read Chapter 1 before attempting to unpack or operate the
Alpha 9500 amplifier.
Warnings: What Not to Do
• Never open the amplifier case without unplugging the unit from the wall outlet.
• Never stick objects into holes in the case.
• Never touch an antenna during transmission.
• Never attempt to turn on the amplifier without the cover securely in place (all
attachment screws reinserted).
• Never turn the amplifier back on after a hard fault without waiting at least 20
seconds.
• Always resist the temptation to immediately hit the ON button after the
amplifier faults to power off.
• Never allow liquids to enter the amplifier through the cover holes.
• Never cover or obscure the exhaust holes in the cover of the amp.
Warnings posted in this manual should be read and thoroughly understood
by users. Failure to perform procedures properly may result in amplifier
damage, fire hazard, or electric shock.
1.5 Owner Assistance
Technical Assistance from Alpha Radio Products is available from several sources.
• The Alpha Radio Products web site is www.alpharadioproducts.com. Click on Support and
follow the instructions. Many typical problems and their solutions are listed on this site. On
this site you can get the following assistance:
• Technical Support
• Repair Information
• Software Downloads
• Manuals

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• Tech Tips
• Legacy Equipment Information
• FAQs
• You can e-mail us for customer support at [e-mail] or you can send
your request by fax to 303.473.9660.
• Our phone number is 303.473.9232

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2 Quick Start Information
2.1 Overview
This section explains in brief the items you need to consider when setting up your Alpha 9500
amplifier.
If you already have a well-designed shack and have used an amplifier before, please review the
items below to make sure you have considered all the critical items for proper installation and
operation.
If you are using an amplifier for the first time, please skip this section and go to sections 3, 4, and
5 for a more detailed explanation of how to set up your shack for maximum safety and operating
enjoyment.
If you have installation questions, do not hesitate to contact Customer Support.We much prefer
to address questions prior to power up.
2.2 Station Engineering Considerations - Checklist
Make sure you have properly addressed the following concerns (Section 2.3 below) before
installation of your Alpha 9500 amplifier. If you are unsure of any of these items, please read the
noted sections carefully.
2.3 Preparation
__ 220V AC Power in shack? (Section 3.2)
__ Amplifier placed with proper airflow? (Section 3.3)
__ Antenna ready for 1,500W? (Section 3.4)
__ Adequate RF cabling? (Section 3.5)

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2.4 Unpacking
__ Unit Checked for Damage?
__ Blower screw removed?
__ Transformer Installed? (Section 4.2.1, 4.2.2)
__ Power Cord Connector Attached? (Section 4.2.3)
__ Amplifier Grounded Properly? (Section 4.4.1)
__ Amplifier Cover Replaced and Secured? (Section 4.4.2)
2.5 Operation
__ All Exciter Interconnections Set? (Section 6.2)
__ Exciter Drive Correctly Set? (Section 6.1.1)
__ Amplifier Tuned to Antenna System? (Section 6.3.6)

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3 Station Engineering Considerations
3.1 Overview
The Alpha 9500 is capable of dramatically improving the performance of your amateur station.
It is important that you observe good engineering practices to achieve all the benefits of such a
station in a safe and reliable manner.This section provides a few hints for important operational
considerations, but it is recommended that the user also consult a good source of general
information such as“The Radio Amateur’s Handbook”by the ARRL, especially if this is the first
high-power amplifier you have used.
3.2 AC Power Source
This amplifier runs best when powered by a 200V - 240V AC circuit. If you do not have a 220V
AC outlet in your shack, you will need to get a licensed electrical contractor to install one. A
minimum of a 20 amp capacity is required. A 20 amp breaker on your 220V circuit is sufficient.
There are many styles of plugs, some of which are country-specific. For this reason, the amplifier
is not shipped with a power plug. Select a location for the outlet as close as possible to where
you expect to operate the 9500. If you are not sure, or contemplate moving the amplifier, you
may choose to get a second outlet installed at the same time. Ask your contractor for two or
three matching plugs during installation as there are several styles of connector available. Ask
the contractor to measure the voltage and record it for reference. The Alpha 9500 can run when
connected to a 110V AC outlet. However, you WILL NOT achieve full legal limit output in this case.
If the amplifier is connected to a 110V AC outlet, you should not expect more than 1000 W output.
Please note that when the amplifier is plugged in and turned on, you will hear the capacitors and
band-switch zero themselves and you may also hear a load“clunk” as the transformer comes up to
full load - this is normal!
3.3 Air Flow
It is critical that airflow around the Alpha 9500 remain unimpeded at all times. Keep the top of
the amplifier clear of any restrictions. If you are mounting the amplifier in a console, make sure
that the exhaust air is properly and fully removed from the console. Poorly designed consoles can

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result in outlet air being drawn back into the amplifier air intake and recirculated, thus getting
hotter and hotter and resulting in degraded amplifier performance or even failure. If you are
designing your own console, consider putting in additional fans and/or ducting to deal with
waste heat. Try to minimize the possibility of dust or other contamination getting drawn into or
falling on the amplifier. It is also advisable to periodically (at least annually) clean the dust out
of your amplifier, paying particular attention to the tube fins, for continued flawless operation.
Alpha Radio Products recommends the use of compressed air for dust removal.
3.4 Antennas
Many antennas that are suitable for general use are unsuited for operation with a full 1500 W
of power. At this power level in a 50-ohm circuit, the RMS current is 5.5 amps and the peak RF
voltage is 387 volts.With a 2:1 SWR, these values double to 11 amps and 775 volts. The actual
voltage and current at various points in or on your antenna may actually be many times these
values. On a simple dipole with sharp wire ends, corona (localized ionization) can easily occur.
Corona can (and has!) led to fire in nearby objects. Traps in beams and verticals can heat up
significantly during high power operation. Instances of melting or flashover of traps have
occurred in many installations where insufficient thought has been given to their ratings. If
an antenna has been deployed for a long period of time, it may be worth taking it down for
inspection prior to full power operation. If any insulators are cracked or show signs of“tracking”,
3”
3”
To ensure adequate cooling
make sure the top and rear
of your amplifier have at
least 3”of clearance to allow
unobstructed airflow.
Figure 3.3 - Minimum clear-
ance for proper airflow

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replace them. Doubling-up on insulators is also easy to do, and may prevent problems. If there
is any chance of people, animals or objects coming close to the antenna, take steps to move it
higher, or place barriers so that this cannot happen. Check the SWR of your antenna; if you have a
favorite part of any band you use most often, consider adjusting the antenna for minimum SWR
in this part of the band.
3.5 Coax and Connectors
The importance of a well-constructed feed-line system cannot be overstated. After all, the
purpose of the amplifier is to provide approximately 2 S units (12+ dB) of improvement in your
radiated signal. All too often, installation problems are encountered where cheap, poor or
under-rated coax and connectors are used. These often are responsible for at least one S unit
of degradation. (This means you could have bought a 375 W amplifier and achieved the same
radiated signal by buying good quality feed-line components!) Use the lowest loss 50-ohm
coaxial cable you can obtain. Use new, clean connectors installed according to the manufacturer’s
recommendation. Clean the connectors after soldering them, and before mating them with
the amplifier. Make sure any excess solder is removed from the connector; likewise remove
any fragments of braid, etc. Never use old coax, which may have had moisture penetrate under
the jacket. Run the coax in straight lines as much as possible. Support it frequently using non-
compressive clips so that it does not hang or stretch under its own weight. Avoid sharp bends
(most manufacturers will specify a minimum bend radius for their product). Make sure the
connection from feed-line to antenna is waterproof. Provide for disconnection of the feed-line
when it is not in use; this protects against damage caused by power surges and lightning strikes,
which are not covered under the amplifier warranty.
3.6 RF Safety
The FCC requires users to check their installations for compliance with published values for allowable
exposure to RF fields. This information is available in ARRL publications, FCC printed rules, and on the
web. Alpha Radio Products strongly recommends that this be done for any installation,both fixed and
at an expedition or contest site.
If you have any questions regarding engineering your 9500 into your amateur radio station,
please visit our online technical support website at: www.alpharadioproducts.com

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4 Unpacking & Preparation
4.1 Unpacking
Remove the strap securing the two boxes to the pallet. Inspect both boxes for physical damage.
Save all packing material and pallet for possible future use. Contact 303-473-9232 if shipping
damage is found. Carefully unpack the amplifier and transformer.
Carefully remove the amplifier and place it on a workbench or table where you can install the
power transformer.
4.2 Installing the Power Transformer
It is recommended that the power transformer be installed when the amp is at or near the place
it is to be used. The chassis of the 9500 is designed for the mechanical loads it experiences when
the amplifier is on a flat surface with the tilt-bail up or down. If the amplifier is tilted too far, such
that the transformer is cantilevered or“hanging out” to any degree, the chassis of the amplifier
can distort. This may affect a number of things, from the alignment of screw holes on the top
cover to the band-switch alignment and tension. If the amplifier is moved, even if only from one
site to another locally, remove the transformer to avoid the possibility of damage.
CAUTION:
Do not operate amplifier without the cover in place and all cover screws
installed. Do not operate the amplifier without a good RF ground connection
on the rear panel ground terminal.

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4.2.1 Remove the Blower Screw
Place the amplifier on the bench or
desk where it is to be used and remove
the cover screws and the cover. With
the cover removed, rotate the amplifier
on to its right hand side as shown in
figure 4.1. While looking at the bottom
you will see a screw labled“BLOWER
SCREW”, this screw holds the blower
securely in place during shipping.
Before operation remove this screw.
4.2.2 Install the Power Transformer
With the amplifier still on its side, follow the illustrations in Figure 4.2 to install the transformer.
The extra piece of wood shipped with your amplifier is the transformer shim, which was cut
to specific dimensions to aid in this installation. Do not over tighten the screws that hold the
transformer in place as doing so may cause excessive vibrations or noise from the transformer.
Once the transformer has been installed and all of the screws are in place holding it to the chassis,
you may proceed to attach the connectors as described in section 4.2.3.
WARNING!
The transformer is very heavy and must be moved with due caution using
only the lifting handle.
Before operation remove
this screw. Before ship-
ping insert this screw to
prevent damage to the
blower assembly.
Figure 4.1 blower screw

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CAUTION:
PROCEED SLOWLY to avoid bumping and damaging adjacent wires,
connectors or components.
While the top cover is removed, make sure the tube is firmly seated in its socket, rubber exhaust
chimney is fully and correctly installed, and anode connector is tightly clamped to the tube. The
silicone rubber chimney installed on the 8877 tube is a critical part of the cooling system. Make
sure the chimney is straight and fully installed so the bottom of the chimney is firmly against the
tube deck and completely covers the airflow opening in the deck. Tube cooling exhaust must
exit only through the tube anode fins; it must not be allowed to escape outside them. Failure to
ensure proper cooling airflow may result in tube damage or destruction, which is not covered
under warranty.

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Figure 4.2
Transformer Installation
1. On a flat surface, with plenty of room, carefully
rotate the amplifier on to its right side (power sup-
ply/transformer side). Rotate the transformer onto
its right side, placing the transformer squarely on the
transformer shim.
2. Slowly move the amplifier and transformer togeth-
er making sure to align the nuts on the transformer
with screw holes in the bottom of the amplifier.
3. Once the transformer is settled into position and
the screw holes are aligned, secure the tranformer
into place from the bottom of the amplifier. Insert
the supplied bolts (1/4 / 20, ½”hex bolts) with ¼”
washers through the four clearance holes in the chas-
sis and into the nuts in the transformer base. Once
the transformer is secure you may carefully rotate the
amplfier back to its standard orientation.
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