KLM ELECTRONICS PA 10-160BL, PA 2-70BL, PA 10-80BL, PA 10-40BL, PA 10-70BL SPECIFICATIONS

KLM ELECTRONICS, INC.

LINEAR VHF AMPLIFIERS
CLASS "AB" FM/CW/SSB/AM

This series of amplifiers is designed for 143 to 149 Mhz 2 meter band operation. The designs use the latest in micro­stripline techniques and highest quality state of the art transistors. Relay switching is automatic RF sensing. These units
do not require any tuning. The boardband design offers the ultimate in flat input VSWR, 1.4:1 or less, and produces
rated power output or better across the entire two meter band. This amplifier can be used for AM or SSB operation as
well as FM and CW.

The front panel switch on all models switches the amplifier in or out. Withthe switch "in", the 13.5 VDC is supplied to
the RF sensing and relay circuit inside the amplifier, however, the unit will not draw any current until the transceiver or
transmitter is keyed and RF is applied to the amplifier. At this point an audible click of the relay can be heard and the
LED light on the front panel will light. The amplifier will now amplify the RF applied. In the "out" position, the
amplifier will bypass the RF through the amplifier.

Forced DC keying can be used by applying + 9 to +15 VDC through a 10k resistor to the base of the MPSA 13 relay
driver.

TYPICAL SPECIFICATIONS FOR ALL MODELS

IMPEDANCE: 50 ohms input and output

SUPPLY VOLTAGE: 13.5 VDC (usable from +11 to +14.5 VDC)

INPUT VSWR: 1.4:1 144-148 MHz

DUTY CYCLE: CAS (Intermittant Commerical Amateur Service)

RF CONNECTORS: SO239

MODEL
NUMBER

RF POWER
INPUT (watts)

USUABLE PWR.
INP. (watts)

NOM. PWR.
OUTPUT (watts)

NOM.
CUR.
(amps)

SIZE

FUSE 3AG
SIZE (amps)

PA 10-160BL 10 5-15 160 22 6.5x10x2 30
PA 2-70BL 2 1-4 70 10 6.5x7.5x2 15
PA 10-80BL 10 5-15 80 10 6.5x7.5x2 15
PA 10-40BL 10 5-15 40 5 6.5x5x2

7

1/2

PA 10-70BL 10 5-15 70 8 6.5x7.5x2 10
PA 10-140BL 10 5-15 140 18 6.5x10x2 25
PA 30-140BL 30 15-45 140 15 6.5x10x2 20

PA10-70BL/PA10-80BL

C2,3,4 68 pf Underwood
C5.6 200 pf Underwood
C8,9,16,17,22 .001 MFD disc
C7.14 1/35 VDC TANT
C10.11 100 pf Underwood
C2.12 47 pf Undeiwood
C1,13,20,21 750 pf DM15
C19 5pf disc
C23 25/15 VDC Eletrolytic
C18 47 MFD 63 VDC
C15 1000pf Feed Thru Allen Bradley
D3,4 1N914
R6 22k 1/4 Watt
R5 560 OHM 1/2 Watt
RFC1.3.5 .15uH
Q1 MRF245 Motorola
Q2 MPSA13 Motorola
R7 560 OHM 1/4 Watt
R2 100 OHM Pot
R3 3 OHM 1/4 Watt

R4 50 OHM 5 Watt
S1 Alco SPDT
LED MV5053
R1 15 OHM 1/2 Watt
RFC2 5T#16 1/4" Dla. x 1/2" Ig.
RY1 Relay 1355/1365
D2,1 1N4003 Diodes
F1 Fuse 15A
RFC4 4.7uH

PA30-140BL

C3,4,5,11,13 68 pf Underwood
C6,7,12,14,10,17 200 pf Underwood
C9,16,24,23,29 .001 MFD disc
C8,15,19 1/35 VDC TANT
C22 47 pf Underwood

C1,21,27,28 750 pf DM15
C26 5pf disc
C20 25 MFD 16 VDC
R7 22k 1/4 Watt
RFC2,3,1,5 .15uH
RFC6 4.7uH
Q1,2 MRF245 Motorola
Q3 MPSA13 Motorola
RY1 Relay #1355/1365 Guardian
D2,3 1N914
D1,4 1N4003
R8 560 OHM 1/4 Watt
R6 560 OHM 1/2 Watt
R3 100 OHM Pot
R4 3 OHM 1/4 Watt
R5 50 OHM 5 Watt
R1,2 15 OHM 1/2 Watt
S1 Alco SPDT
LED MV5053
C30 33 pf Underwood
RFC4 5T#16 1/4" Dia.
C25 47/63V Electrolytic
C18,2 Feed Thru Allen Bradley
F1 Fuse 15A

PA10-160BL

C36 47 MFD 63 VDC
C13,14,15,21,23 68 pf Underwood
C16,17,22,20, 24,27 200 pf Underwood
C18,25,34,35,40 .001 MFD disc
C19,26,30,10 1/35 VDC TANT
C2,6,28 47 pf Underwood
D1,7,32,38,39 750 pf DM15
D37 C31 5pf 25 MFD disc 25 VDC
D8,9,29,11,12 470 pf Allen Bradley
D5 100 pf Underwood
R12 560 OHM 1/4 Watt
R10 560 OHM 1/2 Watt
B1 15 OHM 1 Watt
D4,5 1N914
D1.2.3 1N4003"
02,3 MBF 245 Motorola
Q4 MPSA13 Motorola
Q1 2N6084 Motorola

BFC3,4,5 .15uH Choke
RFC8 4.7uH Choke
B11 22k 1/4 Watt
B3,6 100 OHM Pot
B2,5 3 OHM 1/4 Watt
B4,7 50 OHM 5 Watt
BFC1,2,6 5T#16 1/4" dia.
BY1 Belay 1355/1365
F1 Fuse 25A
LED LED and Mount MV5053
S1 Alco SPDT

PA10-40BL

C1,9,17,18 750 pf DM15
C2,8 68 pf Underwood J101
C3,4,7 200 pf Underwood J101
C5 .01 disc
C6.11 1 MFD 35 VDC TANT

C13,19,10 .001 MFD disc
RFC1,4,2 .15uH
RFC5 4.7 nH
C16 5pf disc
Q1 B40-12 CTC/2N6084
Q2 MPSA13 Motorola
B1 15 OHM 1/2 Watl
B6 22k OHM 1/4 Watt
R5 560 OHM 1/2 Watt
R7 1000 OHM 1/4 Watt
R2 100 OHM Pot
R3 3 OHM 1/4 Watt
R4 50 OHM 5 Watt
LED MV5053
S1 Alco SPDT
C15 47/63 Electrolytic
D3,4 1N914
RFC3 5T#16 1/4" Dia.
RY1 Relay 1355/1365
D4,5 1N4148 or 1N914
D1,2 1N4003 Diode
F1 Fuse

7

1/2

A

C12 Allen Bradley

PA 2-70BL

C2.14.17 100 pf Underwood
C6.15.29 47pf Underwood
C10.11 200 pf Underwood
C8.9 66 pf Underwood
C1,5,16 750 pf DM15
C3,12,21,22,27,28 .001 MFD disc
C13,4,18 1 MFD 35 VDC TANT
C24 5pf disc
C23 47/63V Electrolytic
R11 560 OHM 1/4 Watl
R10 22k OHM 1/4 Watt
R9 560 OHM 1/2 Watl
R8 15 OHM 1/2 Watt
RFC3,5,6 .15uH Choke
Q3 MPSA13 Darlington
RFC7 4.7uH Choke
C7 22 MFD 16 VDC
D4,5 1N914
Q1 B12-12
Q2 MRF245

R2,6 100 OHM Pot
R3,5 50 OHM 5 Watt
R4,7 3 OHM
LED MV5053
S1 Alco SPDT
RFC1,2 5T#16 1/4" Dia.
RY1 Relay 1355/1365
RFC4 7T#16 1/4" Dia.
D1,2,3 IN4003 Diodes
C19,20 Feed Thru Allen Bradley
F1 Fuse 15A
R1 15 OHM 1 Watt

INSTALLATION INSTRUCTIONS:

Connect the positive supply voltage to the red fused lead Connect the gnd lead to the negative or ground side of the
power source Number 12 AWG wire or larger is recommended if the supply leads need to be lengthened Connect the
amphfer between the transmitter or transceiver and the antenna RG-8A/U or equivalent coax is recommended for the
connection between the amplifier and the antenna The amplifier may be mounted in any position

INSTALLATION HINTS:

1 Check all coax cables for proper impedance (50 ohms) and freedom from shorts and/or opens

2 Although the maximum input SWR to the amplifier is 1 4 1, some transceivers may still be unable to produce power
into the amplifier If this occurs, try a different length of coax between the transceiver and the amplifier One half wave
multiples is probably the best choice (Belden foam 8214 31 5 inches RG-8LJ 26 75 inches )

3 If the amplifier switching is intermittent or if the relay buzzes when keyed, check the following a Inadequate drive
power from the transceiver

b High antenna SWR (Try adding another 1A wave to the feed line )

c RF getting back into the transceiver caused by close antenna proximity, poor mic shielding, etc

4 If the amphfer appears to produce low power out, check the following

a A watt meter between the amplifier and the transceiver will check the drive level

b Measure the voltage during amplifier operation as close to the amplifier as possible Voltage for spec output is 13 5
VDC c Even the best watt meters have an accuracy tolerance and they can be fooled if harmonic or parasitic energy is
present Check the power at least two positions in the input and output line of the> amplifier, there should be no
significant change in power

5 The amplifier when installed should draw no current (less than 10 MA)