Page
11
Alpha
87A
User
Manual
Rev
2.0
Section
3
ALPHA 87A Specifications
NOTE:
FCC rules do not permit new amateur amplifiers to be operable on 24-30 MHz as delivered
within the US and possessions. Owners who send Alpha Technical Support a photocopy of
their authorizing amateur license will promptly be provided information on “unlocking” 12 and
10 meter coverage..
Band Change & Tuning:
Automatic under
microprocessor control; average time required for
complete band change and tune-up, <1 second.
No special cables or connections required.
Frequency Coverage:
All amateur bands 1.8-29.7
MHz* plus most non-amateur frequencies 6.0-19.0
MHz and 20-30 MHz.
Power Output:
1500 watts PEP, keyed CW, or
continuous carrier, no time limit. Auxiliary cooling
fan (optional) recommended for very high duty
cycle continuous operation i.e. contesting & RTTY.
Drive Power:
Typically 50 to 55 watts for full rated
output.
Input VSWR:
< 1.5:1 within amateur bands; < 2:1
elsewhere.
Tube Complement:
Two Eimac 3CX800A7
triodes in grounded grid.
T/R System:
Heavy-duty PIN diode switch capable
of feed through and hot switching of 150W exciter
power. Switching time approximately 1ms.
Enclosed mechanical bypass relay.
ALC:
Grid-current-derived, -10V maximum,
adjustable gain.
Harmonic Output:
Better than 50 dB below rated
output.
Intermodualtion:
Better than 35 dB below rated
output.
Fault Protection:
Plate current, grid current, load
VSWR, T/R sequencing, gain (i.e., severe mistune
or RF arc), overdrive, open heater, over
temperature, others.
Displays:
LED bar graphs for peak P
out
, P
refl
& I
g
,
and switched bar graph for I
p
, HV, and Tune
indicator.
Cooling:
Full cabinet ducted air, rear intake/top
exhaust. Floating blower mount for quietest
operation.
Primary Power:
190-250V (200, 220, 240V
nominal taps), 50-60 Hz, single phase; fused 20A.
Size & Weight:
17.3” W x 7”H x 16.5” D (439 x
178 x 419 mm) excluding controls, feet, and
connectors. 75 lb. (34kg) net.
Note: Alpha Radio Products reserves the right to
change design and/or specifications without prior
notice or obligation.
Summary of Contents for 87A
Page 12: ...Page 12 Figures 1 3 Transformer Installation Alpha 87A User Manual Rev 2 0 ...
Page 15: ...Page 15 Figure 4 Inside Top View Alpha 87A User Manual Rev 2 0 ...
Page 16: ...Page 16 Figure 5 Front Panel Lowered Alpha 87A User Manual Rev 2 0 ...
Page 17: ...Page 17 Figure 6 Inside Front Panel Alpha 87A User Manual Rev 2 0 ...
Page 18: ...Page 18 Figure 7 Rear Panel Alpha 87A User Manual Rev 2 0 ...
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