Alpha 9500 User Manual download pdf (Page 42)

Alpha 9500 Linear Amplifier User Manual RF Concepts, LLC

Operating the Amplifier Product Release 1

DOCNUMBER 9500

Document Issue 1.1

Page 5–4 February 2010

Tuning modes You can tune the amplifier in one of three tuning modes—Default, User

1, or User 2—and from any of these proceed to autotune mode.

Table 5-2 Tuning modes

Mode Description

Default

By default, when the amplifier is first powered on or QSYed, it retunes using factory-

supplied tuning values. These values are derived for a load with voltage standing-

wave ratio SWR = 1.0:1, so the amplifier will be tuned with a different tuning value

from default memory for each segment of each band. For SWR ≤ 1.5:1, the default

tuning values are usually appropriate. For SWR > 1.5:1, some manual tuning may be

required using the tune and load controls. The antenna port last used in Default mode

for a particular band and band segment is used.

User 1/User 2

In User 1 or User 2 mode, the amplifier tunes (autoselects) from values stored in User

1 or User 2 memory. As in Default mode, the amplifier retunes at powerup or when

it is QSYed to a different band segment. Initially (from factory), the user memories

are programmed with factory-default values, which are retained until they are

overwritten by new tuning values saved to a band segment. The antenna port is the

last one used for that user memory on that band and segment. If for some reason the

amplifier is not correctly tuned, you can tune it manually using tune and load

controls, and the new value is then stored in user memory.

When you switch among Default and User 1/User 2 modes, the amplifier tunes to the

values stored in the newly selected memory. Programming a user memory overwrites

any previous values, and default values are lost from user memory for a specific band

segment. You can view the default values through the computer connection to the

amplifier.

If you have two antennas that operate on the same band, store separate values in User

1 and User 2 memories. The antenna port selection is determined by the last used

antenna on that band segment.

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Alpha 9500 User Manual Page 42