SSB-Electronic SUPER AMP GaAsFET Series User manual

SP-6/ SP-2000/ SP-220/ SP-7000
SUPER AMP GaAsFET SERIES
50,144,220 &432/435 MHz.
Mast-Mounted Preamplifiers
Thank you for purchasing this preamplifier which is manufactured by SSB ELECTRONIC GmbH. 'Ve
believe that it is without a doubt the best available anywhere aDd would ask that you please spend afew
moments 10 read through these notes in order to ensure that you obtain the very best possible results
from tbis
product.
The full potential of this preamplifier can only be realized when a minimum of feed line exists between
the
preamplifier input and the antenna feed point. Maximum lengths are: 24 flo on SO/144MHz
and IS ft. on 432MHz assuming that a quality coax. such as AIRCOM PLUS is used. This length can
usually
be achieved by mounting the preamplifier on the support mast close to the antenna mounting
point.
The amplification factor of this preamplifier can be adjusted so that agood system gain distribution can
be
maintained. This is important in order to insure that the receiver front-end as well as tbe mixer are
not overloaded. The following table may be used as aguide for setting the preamplifier gain to overcome
the feedline losses encountered from your rig to the preamp.
'-
CABLE LOSSES
Under 2dB
2 - 3
dB
Over 3 dB
GAIN SETTING
M1N
MID
M~,\(
The following table may be used as aguide to the losses for various cable types:
Frequencv
144 MHz.
432
MHz
RG58V
0.2 dB/M
0.4 dB/M
RG213
0.08 dB/m
0.15 dB/m
AIRCOM PLUS
0.05 dB/M
0.08 dB/M
Agood
rule oftbumb is to aim for 12 -14 dB. of gain above feed line losses.
Access to
the gain adjusting potentiometer is obtained by removing the four self tapping screws from the
underside of the unit. This enables the plastic weather shield to be removed exposing the tin plated
shielded box in which asmall hole will be found.
Adjustment may now be made with asmall screw·
driver. CAUTION: Great care should be taken when making this adjustment noting:
a)
The potentiometer only rotates through 270 deg.
b)
Do not exert any pressure on the adjuster
c) Ensure the screwdriver goes to the pot, and does not slip sideways causing possible damage to
any surrounding components. An insulated trimming tool would be best suited for this job!
If the tin plate box lid is removed to make this adjustment then please DO NOT TOUCH ANY
OTHER CONTROLS as these have all been carefully set at the factory for the best noise figure.
124 Cherrywood Drive., Mountaintop, Pa. 18707 (570)-868-5643

The Super Amp. has abuilt in RF S\VITCHING (Vox) capability. This makes for an extremely
simple installation. However, it is
important that the following maximum power limits are not
exceeded
in order to prevent damage to the GaAsFET and possible burning oUhe relay contacts.
THE MAXIMUM RF VOX SWITCHED POWER IS:
SOMHz 144
MHz 220M Hz. 432 MHz
IS0Watts 200 Watts 100 Watts 100 Watts
Provided these levels
are not exceeded the preamp may be connected as shown in Fig. 1
FIGURE I
SP-SERIES
ANT. TRX.
II
50239 I
TOANTE NA 13.8VDC
TO TRA 'CEIVER
+13.8V should be connected to the S0239 connector tbat is located between the "N" female connectors.
The center pin of the 50239 is positive and the outer shell is negative. If you choose to utilize your
preamp in an RF Sensed environment as illustrated in figure t, voltage may be left on to the preamp at
all times.
Some of the newer radios can provide aswitched
preamp control voltage via the feedline.lfyour radio
provides this feature,you may hookup your preamp as illustrated in Figure t. It will not be necessary to
provide 13.8VDC via the 50239 connector, since your radio will provide this function.
Ifhigher power levels are to be used tben it is imperative to use the DC\V-15B sequenced controller.
Figure 2and Figure 3illustrates this
arrangement.
FIGURE 2
SP2000 /SP7000
ANT. (SP
SERIES)
TRX.
1 S0239 1
TO ANTENNA (Not uscd)
2
TO DCWlSB
SEQUENCED CONTROLLER

(Usually aGround on IrlInsmll. or + \ oils on Transmit).
///
/
/~
J/ /
SP2000 ISP7000 ISP-220
SUPER·AMP SEQUENCED GROUND ON TRANSMIT CONTROL LINE FROM DeW-IS FOR
LINEAR Ai\lPl..InER CONTROL.
Pr~Amp Pin 2TRX(PA)
RANSCEIVEI DCWI5-B
LINEAR AMP
Pin ,,' \
rnNTROI LINE fDn,'\, nUNc;::rqVJ'R
,
FIGURE 3
SP-2000, SP-7000, SP-6, SP-220 HIGH POWER HOOK-UP
CW/SSB
ATV
"-
By utilizing our DC\V-158 Sequenced Controller, the SP SERJI!:S of Pre-amplifiers can
be safely used in ahigh power
environment. The maximum sequenced power levels are:
50~'IHz. 144MHz 220M Hz. 432MHz
650Walls 750 Walls 650 Walls 500 Walls
150 Walls
The DeW-ISB SEQUENCER provides sequenced control afyaur Linear Power amplifier. It guarantees
tbat preamplifier switchover occurs prior to linear amplifier turn-on. The DC\VJS-B insures that hot-
switching
of the coaxial relays at elevated pO\\'er levels will not take place. The DC\V-lSB has abuilt in low
loss BIAS
"T" that provides the preamplifier control voltage via the feedline thus eliminating the addi-
tional expense of another cable. In addition, the DCW15-B allows front panel switch selection of Linear
amplifier In/Out and Preamplifier In/Out functions.
DCW-IS BD-Sub Connector Pin-outs
Pi" 1 Ground Ground
Pill 2PA Control Provides asequenced ground on transmit via arelay contact to control
Linear Amplifier turn on. This function is bypassed when Linear amplifier
OUT has been selected via the front panel.
Pi" 3 PIT Line I Grounding this line starts sequencer functions. If your rig provides a
ground on transmit via a PTT jack, connect your rig's PIT line to PIN 3.
3

Pi" 4 PIT Line 2Some rig's do not provide a ground on transmit to control other auxilliary
equipment. If your rig provides +Von transmit, connect the+V line to Pin 4.
+V on this pin starts the sequencer function. Do Dot exceed 13.8VDC
Pi" 5+13.8V
Pi" 6 Ground
Connect to +13.8V
Ground
c
"~
TRX(PA)
PreAmp
._5
0 0
••
••
-3
••
6-
••
-I
'-
DC\V 15 B Rear Panel
TRX (PA) N(F) - If a Linear Power Amplifier is being used -connect to the Power Amplifier RF
Output. If only a tranceiver or a transverter is being used, connect to the RF output of the trans
ceiver or transverter.
Pre Amp N(F) - The feedJine from the preamp should be connected here. +13.8VDC will be
pres~'ct during receive cycles 00 the centcr pin oft"'! ""N" connector. NOTE: 13.8VDC will not be
present
if Preamplifier OUT was selected.
Note:
This preamplifier has been designed with failsafe circutry. \Vhen power is not applied to
the
preamp or the DC\VlSB, the preamp is not in line.
Please
insure that the cables that you use arc assembled properly. Insure that the center pin of
your '"N" connectors are centered and do not protrude. Replacement of arelay can get expensive!
Should you
ever have any questions concerning the operation or the hook up of your SP SERIES
Preamplifier or your DC\V-ISB Sequencer, please do not hesitate to contact us.
73's
Gerry Rodski
K3MKZ
SSB ELECTRONIC USA
570-868-5643
45P2000

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