OHR KEYER KIT

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Division Of Milestone Technologies, Inc.

Keyers for OHR Transceivers

OHR 100A Photo
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
Note: We do not accept unsolicited advertisements by phone or facsimile.
Please address all inquiries to Milestonetechnologies2020@gmail.com

Oak Hills Research is a division of Milestone Technologies, Inc. All text and images in this web site are the intellectual property of Milestone Technologies. or are used with permission of the copyright holder. Please ask for permission before "borrowing" or otherwise using any images or contents from this web site.

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