1. Introduction
Extremely small size and extremely low power cons mption electronic keyer, Pocket Keyer, offers
an Iambic keying with 4 message memories. The c rrent drain is approximately 160 µA at 3 V, and
can be contin o sly powered by a pair of UM4 batteries for a co ple of months. Fo r message b t-
tons are mo nted on the panel, and yo can recall memorized messages q ickly. Simply press one
of the fo r b ttons to recall the message.
Fo r messages (1 – 4) are stored into non-volatile EEPROM that keeps the contents witho t power.
Message No. 4 has A to Repeat Message f nction with programmable pa se time.
electable keying weight
Keying weight (ratio of dot and dash) can be set to 3, 3.5, 4 or 4.5 by simple operation of Memory
b ttons.
Low noise generation
Micro Control Unit (PIC16F62SA) of PK-4 r ns at a very low clock freq ency – aro nd 160 kHz. It
generates m ch less noise than a high freq ency clocked processor.
2. pecifications
Keying Type Iambic B mode, Straight key mode
Keying speed Approx. 8 to 50 WPM
Weight 4 selectable weight levels; 3 3.5 4 4.5
CW messages Message 1: 40 characters,
(nonvolatile) Message 2: 20 characters,
Message 3: 20 characters,
Message 4: 40 characters, A to Repeat f nction,
(Note: Above character n mbers incl de space.)
Side tone B ilt in piezo-electric Speaker
Power req irement 2.5 – 6 V DC, typical 2 × AAA batteries
3. Turn on the Pocket Keyer
When yo first t rn on the Pocket Keyer, the weight is set to 3.5, side tone is enable and the keyer
is ready for Iambic keying. Adj st the SPEED knob for desired keying speed.
4. Record Messages
Keep pressing the MEMORY b tton for abo t 1 second. REC LED will brighten contin o sly. Then
release the REC b tton.
Short press one of the fo r message b ttons 1, 2, 3 or 4. REC LED will be t rned off.
Then enter a message with yo r paddle. Yo have to inp t CW code correctly. Otherwise PK-4 will
stop recording; e.g. Yo want to inp t CQ. So yo paddle '-·-· --·-', b t accidentally yo paddle
'---- ––·-'. Beca se '----' isn't a correct Morse code, PK-4 cannot recognize it. Therefore it will
stop recording. So '--.-' Q and follow letters will be not recorded.
