HAMTRONICS XV2 Assembly, Installation, Operation And Maintenance Instructions

HAMTRONICS® XV2 VHF TRANSMITTING CONVERTER: HAMTRONICS® XV2 VHF TRANSMITTING CONVERTER:
ASSEMBLY, INSTALLATION, OPERATION, AND MAINTENANCE ASSEMBLY, INSTALLATION, OPERATION, AND MAINTENANCE
à
Note: This manual only applies to
the new version of the XV2, revised Nov
1993. If you have an older version of
this unit, many of the components and
the crystal type will be different.
DESCRIPTION.
The XV2 is designed to convert
1mW of ten meter energy to provide
1.5-2 W p.e.p. ssb output on 2 meters.
Because the XV2 is a linear transla-
tor, it may be used on any mode: ssb,
cw, fm, am, etc.
Generally, a low power tap on the
exciter is used in conjunction with
an external attenuator circuit.
operation with higher power exciter
signals, a simple external attenuator
can be added to reduce the input
level to 1 mW. (Attenuators are
treated in detail later.)
Because of the simplicity and
economy of a transmit converter
separate from the receiver converter,
the XV2 is ideal for satellite commu-
nications or versatile terrestrial op-
eration.
SPECIFICATIONS.
Frequency Coverage:
XV2-4 28-30 = 144-146
XV2-5 28-30 = 145-147
XV2-6 28-30 = 146-148
RF Bandpass 2 MHz
RF Input 1 mW p.e.p. into
50Ω (0dBm)
RF Output 1.5-2 W p.e.p.
Duty Cycle 100% ssb or keyed
cw, 50% on fm
In/Out Impedance
50Ω
Power Required Regulated
+13.6Vdc at 400
mA
Spurious Less than -53dB
IM Distortion -30 dB at recom-
mended drive level
CIRCUIT DESCRIPTION.
Frequency conversion is accom-
plished by two n-channel j-fet's ope r-
©1994 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark.
INSTRUCTIONS INSTRUCTIONS
ating in a balanced mixer configura-
tion. Injection is generated by a 13
MHz crystal oscillator operated from
a voltage regulator.
frequency is tripled once at the col-
lector of the oscillator and again in
Q2 to give a 116 MHz injection fre-
quency for the mixer.
The vhf output of the mixer is am-
plified in two class A amplifiers and a
class AB output stage to provide 1.5 -
2W output. This output may be used
to drive a linear power amplifier to a
higher level or it may be used di-
rectly with an antenna. A low pass
filter in the output minimizes har-
For
monics so that direct operation may
be safely undertaken.
GENERAL CONSTRUCTION
NOTES.
Use a small, but hot, pencil type
soldering iron for this kit. Patience
is required in mounting some of the
components, and it helps to install a
few parts, or in some cases only one,
at a time and then soldering before
proceeding.
With few exceptions, components
must be mounted with the shortest
possible leads to the board.
espe cially true with bypass capaci-
tors. An extra 1/8-inch lead acts as
a large inductance; so a little extra
care in construction makes a big dif-
ference.
Most pertinent construction de-
tails are given on the component lo-
cation diagram. A complete parts list
is given, too; but be sure to read con-
struction notes in the text on these
first two pages to be sure you do eve-
rything required. Be sure to follow all
the step-by-step instructions, and
don't ad lib. It may take a little
longer to assemble the kit, but it will
work when done.
Note that this unit has been very
popular for OSCAR and terrestrial ac-
tivity for many years. It is one of our
oldest kits, yet still very popular b e-
cause it works so well. When it was
designed, all the slug tuned coils had
to be hand wound by the builder on
plastic coil forms supplied. In recent
years, we have been using molded
The oscillator plastic coils in our transmitter and
receiver
have asked if we could also use them
in the XV2. We have found a way to
do so without adding to the cost of
the kit. It requires forming the leads
for different spacing, but saves the
trouble of winding those coils.
hope you agree the little extra effort
in mounting these coils is worth the
advantages.
L WARNING! The metal shield may
have sharp edges. Use caution not to run
your fingers along the edges.
ASSEMBLY PROCEDURE.
a. Begin construction by install-
ing the "L" shaped metal shield as
follows.
wire should be cut to 3/8 inch long
and soldered to the board in the five
places shown to support the shield.
Insert each piece so that 1/16 inch
extends through the foil side of the
board, and solder in place.
proximately 1/4 inch should protrude
on the component side of the board.
After
straighten them.
This is
b.
place around the wire pins as shown.
The shield may be a little out of
square from shipping; so work it to
proper shape with all wire pins con-
tacting the shield.
c.
left) corner of the shield to the wire
pin with a little solder.
the shield is down against the board,
and then tack solder the rest of the
wire pins to the shield. Use a small
tool to hold shield in place while sol-
dering to avoid burning fingers.
d. Using a pair of wire cutters or
scissors, clip a small diagonal piece
off the corner of each shield end to
remove the sharp pointed corners.
e.
coils as follows. Refer to parts list to
determine values of coil for each p o-
sition.
coils requires that their leads be
Revised: 1/31/00
modules, and customers
Pieces of #22 tinned bus
soldering the five pieces,
Set the "L" shaped shield in
Tack solder the inside (upper
Make sure
Install the seven slug-tuned
Using these new pre-wound
- Page 1 -
We
Ap-