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Division Of Milestone Technologies, Inc.
Keyers
for OHR Transceivers

The OHR Basic Iambic
Keyer Kit
shown installed in the
OHR100A, with connecting
plugs removed for clarity
The
Oak Hills Research Memory
Keyer
is based on the standard-setting
PK-4 keyer chip from Jackson Harbor Press. It is designed for easy
installation
inside, and integration with, the OHR 500 and OHR 100A
transceivers.
It uses the board shown above, and adds only one connector and a
pushbutton
switch, along with the enhanced keyer IC.
The kit contains all necessary parts for
assembly and
installation in the OHR 100A or OHR 500, including schematic diagram,
large
parts overlay diagram, and complete parts list.
Key features of the PK4:
2,
3 or 4
memories, non-volatile (contents retained when power off)
memory
embedded pause, callsign memory insertion
weight
adjustable via menu item
tone
frequency adjustable via menu item
beacon
mode including timed beacon delay
separate
command sidetone frequency (lower - non adjustable)
bug
mode
(dit paddle normal, dah paddle functions as straight key)
straight
key input via bug mode or via paddle simulpress with diodes
tune
function via menu (or 5 didahs or 10 dits or dahs)
Ultimatic
keying mode (switch from dot to dash, no alternation.
selectable
Iambic keying modes A
or B
two
selectable varieties of mode b: Accu Keyer / CMOS Super keyer
dit
/ dah
memories can be turned off
selectable
live "on the air" recording of memories
paddles
can be reversed via menu item
autospace
on/off selectable
stuck
paddle protection (puts keyer to sleep after 128 consecutive
dits/dahs)
tune
mode
timeout after 14 seconds
low
power, about 7 ua w/regulator while keyer is asleep, 3 ma or less
active
@ 5V
Single
lever paddle compatible, "both" paddle features are accessable
with
an in-turn press of dit then dah or dah then dit
power
up
bypass straight key mode
selectable
two or one second press and hold delay time
embedded
"pause and go", keyer will pause for operator sent code, then
automatically resume playing the message after a word space
"backspace"
while recording, if a mistake is sent, the operator can
back
up one character in memory with a mem+dit PAR (press and release)
In fact, this little keyer has so many
features we won't
even try to list them here, but feel free to review the manual for the
PK4 keyer
(PDF format)-- just
click here. As the best single-chip keyer on the
market, the
PK3 has been a best-seller in its own right, and is the
basis of the MX
Sprint keyer paddle and Palm
Radio's Code Cube.
Construction is simple, and the
operating guide portion
of the manual has clear and concise instructions for programming and
operating
the keyer. One hole must be drilled in the rear of the radio,
for
the single pushbutton switch.
To order the OHR Memory Keyer
for your radio, click on
the the relevant "add to cart" link below:
Electronic
Memory Keyer kit for OHR 100A, $49.95 |
|
Electronic
Memory Keyer kit for OHR 500, $59.95 |
|
 |
This kit
includes one or more devices which
are extremely sensitive to electrostatic discharge. We
recommend
the use of an antistatic
wrist strap |
The
Oak Hills Research Basic
Iambic Keyer
is based on a custom-programmed
keyer chip from Jackson Harbor Press. It is designed for easy
installation
inside, and integration with, the OHR 500 and OHR 100A transceivers.
The kit contains all necessary parts for
assembly and
installation in the OHR 100A or OHR 500, including schematic diagram,
large
parts overlay diagram, and complete parts list.
Features
- Iambic A and B Modes
selected by
jumper.
- 8 to 40WPM Speed Range,
continuously
adjustable and pot controlled.
- Automatic
Spacing between
characters.
- Selectable Bug, Ultimatic,
and Tune
modes.
- Can be Upgraded to memory
and
keyboard functionality.
If you are unfamiliar with the
difference between Iambic
A and Iambic B modes, just select B. A and B are
timing standards
adopted by different keyer manufacturers over the years. They
relate
to what happens when you release a
“squeeze.” Most electronic keyers
use B mode, including AccuKeyer, AEA, Heath, Nye, MFJ, Jackson Harbor,
and TenTec. Ultimatic is a pre-iambic keying mode in which
the result
of a squeeze is that the keyer will switch to the last lever pressed
rather
than alternating dits and dahs.
To order the OHR Basic Keyer
for your radio, click on
the the relevant "add to cart" link below:
Electronic
Keyer kit (basic) for OHR 100A, $39.95 |
|
Electronic
Keyer kit (basic) for OHR 500, $49.95 |
|
 |
This kit
includes one or more devices which
are extremely sensitive to electrostatic discharge. We
recommend
the use of an antistatic
wrist strap |
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Oak Hills Research
Division of Milestone Technologies, Inc.
2460 South Moline Way, Aurora CO 80014
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