Acom 1000 User Manual

User's Manual | ACOM 1500 | HF + 6 m Linear Amplifier
August 2021
S e c t i o n OPERATION | Page
27
of
52
NOTICE
Do not switch the ANTENNA or BAND switch knob while tuning or transmitting with the
amplifier! Hot switching will eventually destroy the BAND switch, not covered by the
warranty!
NOTICE
When tuning, never apply continuous drive longer than 3 (three) minutes without
pausing at least 1-2 minutes to allow the tube to cool.
It is recommended that for initial tuning a free frequency in the middle of the band be selected (make sure
the frequency is not being used by others so that you do not make QRM).
First, with no drive power applied, select the band and correct antenna number. Then, use Table 4-1
Approximate tuning presets in order to achieve an approximate preset for both TUNE capacitor and LOAD
capacitor knobs settings:
Table 4-1 Approximate tuning presets
Band, MHz
Tune Knob Dial
Load Knob Dial
1.800 - 2.000
55 - 42
75 - 60
3.500 - 4.000
59 - 45
73 - 60
7.000 - 7.300
56 - 50
65 - 57
10.100 - 10.150
15 - 14
25 - 24
14.000 - 14.350
64 - 52
30 - 29
18.068 - 18.168
74 - 68
70 - 68
21.000 - 21.450
26 - 20
47 - 45
24.890 - 24.990
72 - 70
60 - 59
28.000 - 29.700
35 - 21
45 - 39
50.000 - 54.000
32 - 16
20 - 15
Table 4-1 Approximate tuning presets
b) Selecting the plate-load True Resistance Indicator (TRI) tuning aid
You may select the TRI scale in three different ways:
• By pressing the PREV+NEXT buttons simultaneously for a moment.
This will insert a 6 dB attenuator between the driver and the amplifier's input (the ATT LED
will light), so you will not need to reduce the drive power during tuning. Press PREV+NEXT
buttons momentarily again to switch the attenuator off the input and to return to the old
screen. If you use any of PREV or NEXT buttons only, the attenuator would be switched off
too, but the information screen would change to respectively previous or next;

Acom 1000 Specifications

General

Brand	Acom
Model	1000
Category	Amplifier
Language	English