KD1JV Designs AT Sprint 3B Bedienungsanleitung

The AT Sprint 3B

A very small, very effective, 6 band HF CW rig

“DIGITAL READY”

Operation and Assembly Manual for version 3B 1

By KD1JV Designs

Steven Weber

633 Champlain St

Berlin, NH 03570

kd1jv@moose ncia net

http://kd1jv qrpradio com

Table of Contents

Basic operation:...................................................................................................................................................................5

Turning the rig on and off:..................................................................................................................................................5

Band selection and power up:.............................................................................................................................................5

Control switches:................................................................................................................................................................5

Frequency tuning: .........................................................................................................................................................5

SPL T MODES:.............................................................................................................................................................6

Frequency annunciation while in Split modes:........................................................................................................6

MENU:...........................................................................................................................................................................6

Quick selections: .....................................................................................................................................................6

DFE Mode: ..............................................................................................................................................................6

Tune Mode: ..............................................................................................................................................................7

Battery Voltage:........................................................................................................................................................7

MENU switch only selected functions:.........................................................................................................................7

Frequency readout: ..................................................................................................................................................7

S: Selecting Keyer code speed; ...............................................................................................................................7

M: Keyer Memory entry: .......................................................................................................................................8

Sending messages: ...................................................................................................................................................8

D: Digital modes: ....................................................................................................................................................9

P: Program user preferences.....................................................................................................................................9

A: Alternative paddle ............................................................................................................................................10

Assembly:..........................................................................................................................................................................12

Reference pictures of the front and back sides of completed board:..........................................................................14

Overall placement diagrams. ......................................................................................................................................15

Parts check list: ...........................................................................................................................................................16

Resistors:......................................................................................................................................................................17

Capacitors:...................................................................................................................................................................19

Semiconductors:...........................................................................................................................................................20

Through hole parts.......................................................................................................................................................22

The SMT LED display should be soldered down first. ..............................................................................................22

Filter boards:................................................................................................................................................................23

Check out and Calibration:................................................................................................................................................24

Reference Oscillator Frequency Calibration:.........................................................................................................24

Local Oscillator frequency trim:............................................................................................................................25

Band filter test and adjustment:..............................................................................................................................25

Troubleshooting:................................................................................................................................................................27

Specific problems:.......................................................................................................................................................27

C Voltage tables: Receive mode.................................................................................................................................28

Schematics.........................................................................................................................................................................29

Theory of Operation:.........................................................................................................................................................35

Controller:....................................................................................................................................................................35

DDS .............................................................................................................................................................................35

Receiver:......................................................................................................................................................................35

Transmitter:..................................................................................................................................................................36

Digital mode operation:.....................................................................................................................................................37

Entering ATS3-B into digital mode operation:............................................................................................................37

Running Pocketdigi:....................................................................................................................................................37

Calibration:...................................................................................................................................................................38

Specifications:

Frequency coverage: 80/40/30/20/1 /15 meter bands

Receiver MDS, 0.2 uV

Small signal bandwidth 500 Hz

Receive current, no signal 35 ma.

Transmit power output: 2.5 watts at 9V, 4.5 watts at 12 V

Transmit current: 460 ma at 9 V, 610 ma at 12 V

Supply voltage: 5.5 volts minimum, 12 volts maximum

Operation:

Basic operation:

Turning the rig on and off:

As there is no power switch, the rig is turned on and off by inserting or removing the power plug from the jack.

Make sure the plug is firmly and fully inserted into the jack. Try not to put any sideways pressure on the plug, it

the jack may become intermittent.

Band selection and power up:

The desired band of operation is selected by inserting the appropriate band module into the SIP header socket

on the main board and then powering up the rig. On power up, a voltage determined by a voltage divider is read

so the processor knows which band module is in use. A one digit number relating to the band module installed

will be shown on the LED display and annunciated in Morse by the side tone. The standard QRP calling

frequency for that band (if any) will be loaded into the DDS as the initial operating frequency. You can then tune

from there or use the Direct Frequency Entry function to move directly to another frequency.

Band Display/Morse Initial frequency

________________________________

80 M 8 3.560 MHz

40 M 4 .030 MHz

30 M 3 10.110 MHz

20 M 2 14.060 MHz

1 M 18.0 0 MHz

15 M 5 21.060 MHz

Control switches:

Four push button switches control the

operation of the ATS-3B. All switches have

multiple functions. The primary function of

each switch is labeled in red in the switch

function flow diagram shown to the right.

Secondary functions are enabled by a

short click of either the MENU switch or the

SPLIT switch, followed by clicking the

switch for the desired function. This allows

often used secondary functions to be

quickly accessed. Print out this page and

cut out the diagram to paste in the lid of

your tin as a reminder of switch functions.

Frequency tuning:

The operating frequency of the rig is controlled by the TUNE UP and TUNE DOWN buttons. These are labeled

on the front panel with an up arrow and down arrow, respectively. “Clicking” the appropriate switch will increment

or decrement the current frequency by 50 Hz. Holding one of the tune switches closed for longer than one (1)

second will start an auto-tune mode. The frequency will now change in 100 Hz steps at a rate of about 10 steps

a second as long as the switch is held closed. Tuning will revert back to normal one step, 50 Hz tuning when the

switch is released. The 100 Hz / 10 steps a second tuning rate is a compromise between being able to scan the

band at a reasonable rate, while not being so fast its easy to miss weak signals.

Tuning limits:

The tuning range includes the entire band, though SSB reception is not possible since it will be received on the

wrong sideband. A double beep will sound when the band edges are reached and tuning will stop there,

preventing out of band transmission. A single beep will sound when you reach the edge of the USA CW band

segment.

SPLIT MODES:

The ATS-3B has both RIT (Receive Incremental Tuning) and XIT (Transmit Incremental Tuning). Both modes are

enabled by using the PLIT switch and which mode is selected is determined by how long the switch is held

closed. Once either RIT or XIT mode is enabled, the decimal point of the LED display will light to indicate split

modes are active. There is no limit the the tuning range of RIT or XIT, other then the normal band limits.

RIT is enabled by clicking and holding closed the PLIT switch closed until the letter “R” is annunciated in Morse

by the side tone. There is a slight delay after closing the switch and the sending of the “R”, as the split switch is

also used to activate the transmission of keyer messages.

XIT is enabled by clicking and holding closed the PLIT switch for one second after the “R” sounds and the letter

“X” is annunciated. NOTE: If RIT is active, XIT can only be enabled by first exiting RIT mode.

Split modes are exited by clicking and holding closed the PLIT switch until a “dot” is sounded by the side tone.

The decimal point on the LED display will go out and the original (Rx =Tx) operating frequency which was in use

when the split mode was activated will be restored.

Frequency annunciation while in plit modes:

Using the frequency annunciation while in split mode will indicate the delta (difference) between the receive and

transmit frequencies. For example, if you have tuned above the initial frequency by 1 kHz, the frequency will

display [01-0]. If you have tuned below the original frequency by 1 kHz, the frequency will display [99-0]. In

addition, a “dot” (beep) will sound at each 1 kHz mark. If you tune back to the initial frequency, where receive

and transmit frequencies are equal, a [ 0 ] will flash on the display.

MENU:

The Menu switch is used to access, activate or escape from, the various functions and options available in the

rig. The Menu switch is sometimes used alone and sometimes in conjunction with the other switches to activate

a function. In all cases, how long the menu switch is held closed will determine what function is to be activated.

Quick selections:

The DFE, Tune mode and battery voltage functions can be quickly accessed by using the Menu switch in

conjunction with one of the three other switches. The MENU switch has to be clicked closed first, then one of

the other three switches clicked within 1/2 second to activate the desired function.

DFE (direct frequency entry) = Menu, then PLIT

Tune Mode = Menu, then Tune Down

Battery Voltage = Menu, then Tune Up

DFE Mode:

(“D” is annunciated when mode is activated)

This mode allows you to enter a desired operating frequency using the paddle. This can be any frequency within

the upper and lower band edges currently in use. Simply use the paddle to enter the frequency numbers in

Morse, starting with the 100 kHz digit and ending with the 100 Hz digit (four numbers total). Zero's can be sent

as a cut number “T” or full length. The LED display will flash the number which has been entered and the side

tone will sound a beep. If a number is miss sent, a “?” will be annunciated and that digit must be re-entered.

When four digits have been entered, the rig will re-tune to that frequency. If the frequency entered is beyond the

tuning limits, DFE mode will simply terminate and the frequency will remain where it was.

NOTE:

●DFE mode is not available if the rig is in Straight key mode.

●DFE mode is not available when split operation is active.

●DFE mode can be escaped by clicking the Menu switch at anytime before 4 digits have been entered.

Tune Mode:

(“T” is annunciated when mode is activated, “t” shown on display)

This mode allows you to toggle the transmitter on and off using the paddle. This makes it easier to adjust a

small antenna tuner if two hands are required to operate it (One to hold it in place and one to turn knobs). This

mode also allows you to make power output measurements, which require a steady carrier for a few seconds in

order to make an accurate reading.

Toggle transmitter on: Tap the LEFT paddle.

Toggle transmitter off: Tap RIGHT paddle.

Exit Tune mode: Click Menu switch, “E” annunciated.

NOTE: Tune mode is not available if the rig is in Straight key mode.

Battery Voltage:

This mode reads the input voltage to the board and then displays it on the LED display and annunciated in

Morse. The letter “B” is sent before the digits during Morse annunciate. The voltage is measured after the

reverse polarity protection diode and has a 5% accuracy.

MENU switch only selected functions:

Frequency, Keyer code speed (S), keyer memory entry (M), Digital modes (D), user settable options (P) and

Alternative paddle (A) functions are selected using only the Menu switch. With the exception of Frequency, click

and hold closed the Menu switch until the letter on the segment display appears and the Morse letter

identifying the desired function has been annunciated by the side tone, then release the switch. The switch must

be released before the next letter in the menu sequence is annunciated to select the desired function.

Frequency readout:

A quick click and release of the MENU switch will activate the frequency readout. The default mode of readout is

both a numerical readout, sequenced one digit at a time on the LED display, and annunciated in Morse by the

side tone. The 100 kHz, 10 kHz, 1 kHz and 100 Hz digits are indicated, in that order. MHz digits are implied by

the band in which the rig is currently operating on. A dash [ - ] on the display and an “R” in Morse indicates the

decimal point separating the 1 kHz digit from the 100 Hz digit. Zero's are sent as the cut number “T” in Morse.

Therefore, a frequency such as .0400 will be sent as T4TRT in Morse and seen as 040-0 on the display. It is

possible to set the rig to indicate the frequency only with the LED display or send it only in Morse.

: electing Keyer code speed;

(“S” on the display)

Click and hold closed the MENU switch until the letter “S” is annunciated and appears on the segment display,

then release the switch. This mode will automatically exit after 1 second if no action has taken place in that time,

or you may click the MENU switch to exit right away. The selected code speed will be retained in memory and is

restored as the default code speed when the rig is powered up. Code speed can be changed by using either the

paddle or tune up and tune down switches. Code speeds are selected in approximatively 1 wpm increment using

the paddle and 5 wpm increments by using the tune up and tune down switches . A beep will sound at each new

code speed increment. The 5 wpm code speed increments provided by the tune up and tune down switches

gives a quick means of changing the code speed to more or less match another stations code speed during

contests.

Increase speed: Close RIGHT paddle or Tune Up switch.

Decrease speed: Close the LEFT paddle or the Tune Down switch.

NOTE: If the rig is in Straight key mode, the Tune up and Tune down switches are used to change code speed.

While in Straight key mode, code speed increments in 1 wpm steps. This allows changing the code speed used

to send previously stored messages.

M: Keyer Memory entry:

(“n” on the display – the closest we can get to “m” with segments)

There are three keyer memories available, with a combined total of 124 character storage. Word spaces count

as characters, as they take up one memory location. If more one than one message is desired, they must be

entered in sequence, all in one session. Once a message is started to be entered, all previously stored

messages are deleted.

Upon releasing the Menu switch after the letter “M” has been annunciated, the receiver will mute and entry of the

message via the paddle may begin. If keyer memory entry has been selected by mistake, clicking the Menu

switch will exit this mode without disturbing the contents of the memory, provided the paddle has not yet been

used.

Timing for determining letter and word spaces is automatic and is based on “ideal” timing. Since many of us

have a hard time sending with ideal letter and word space timing, generally running letter groups and words

together, segments on the LED will flash to let you know when a letter time out or word space time out has

occurred. The upper left LED segment (f) will flash at the letter space interval and the upper right segment (b)

will flash at the word space time out. Paying attention to the flashing lights will allow you to enter a message

without timing mistakes.

Entering more than one message.

At the end of the first message, sending seven ( ) (or more) dashes will signify the end of that message and the

beginning of the next. If a third message is desired, again send seven dashes at the end of the second message.

If the available memory space for messages is exceeded before you can complete an entry, the memory entry

mode will be terminated and the check message playback mode will start.

Checking and storing the message:

When you have finished keying in the messages, click the Menu switch. The message(s) will then play back so

you can check that they were entered correctly. If more than one message has been entered, you will hear the

seven dashes indicating the break between them. If the playback is good and there are no mistakes, click the

Menu button again to store the messages into Flash memory. If you need to redo the messages, click the Split

switch and “EM” (Enter Message) will be sent by the side tone. Then re-enter in the messages.

ending messages:

The PLIT switch is clicked first, then within 1/2 second, click either the Tune Down, Tune Up or Menu switch

to transmit the desired message. This new method eliminates the problem of accidentally sending message 1

when using the split switch for it's primary function, turning on or off split modes.

Message 1 is sent by clicking the Tune Down switch within 1/2 of a second after releasing the Split switch.

Message 2 is sent by clicking the Tune Up switch within 1/2 of a second after releasing the Split switch.

Message 3 is sent by clicking the MENU switch within 1/2 of a second after releasing the Split switch.

Message Pause, top and Beacon mode:

After a message has started being transmitted, it maybe paused or stopped using the paddle.

Pause: Closing the RIGHT paddle or Tune Up switch will pause the message for as long as the paddle is held

closed. Pause will start when a character being sent has finished sending.

top: Closing the LEFT paddle or Tune down switch will terminate the transmission of the message when a

character currently being sent has been completed.

Beacon mode:

Only message 1 can be used as a beacon. After message 1 has started transmitting, pause the message by

closing the RIGHT paddle (pause), then tap the LEFT paddle. Tune up and Tune down switches can also be

used. The letter “B” will be annunciated and a lower case “b” will be displayed on the LED to remind you your in

beacon mode. There is a fixed length pause of a couple of seconds at the end of the message before it starts

sending again. The message maybe paused or stopped as described above. In addition, tapping either dot or

dash paddle during the pause will terminate beacon mode.

D: Digital modes:

(“d” on the display)

Thanks to the efforts of Vojteck Bubnic, OK1IAK, the ATS-3B can transmit a number of different types of digital

modulation. However, since the rig was designed for CW use and hence uses a Class C PA and square wave

drive, some of the digital modes are more effective than others. Digital modes can only be used in conjunction

with the Pocketdigi program. No other digital mode program will work, as they do not have the required special

communications protocols needed to tell the ATS3B what to do. Detailed operating instructions start on page 32

of the manual.

P: Program user preferences

(“P” on the display)

The following user preferences can be selected and stored in memory and are non-volatile. Only the functions

you wish to change need to be selected.

○Iambic A or B mode, A mode initial default

○Reverse Paddle dot and dash sense. Default is right, dot / left, dash. This applies only to the sending of

code.

○frequency annunciation code speed, 20 wpm initial default

○frequency readout -- Morse + Display (default), Morse only or Display only.

Iambic mode select: Click TUNE UP switch. Clicking the tune up switch will toggle between the A and B modes.

The letter “A” or the letter “B” will be annunciated by side tone, indicating the selected mode.

Reverse paddle sense: click the PLIT switch. This will toggle between normal (Morse N) and reverse (Morse

R) modes

Annunciation code speed: Click TUNE DOWN switch. This will set the code speed at which the non-

transmitted Morse annunciated characters are sent at to the code speed the rig is currently set to. The letter “S”

is annunciated to let you know something happened when you clicked the switch.

Once the above selections have been made, click the MENU switch again to advance to the next

selections: (F will appear on the display)

Frequency readout method: The method used for frequency readout maybe selected using these switches:

PLIT switch: Both Morse and display readout.

Tune Up switch: Morse only readout. “MO” annunciated.

Tune Down switch: LED Display only readout. “DO” annunciated.

To store the preferences you have selected, click the MENU switch.

A: Alternative paddle

(“A” on display and side tone)

This option allows using the Tune up and Tune down switches as a paddle. This option is a little clunky and

difficult to use, but it is useful if you want to save weight or have a problem develop with your external paddle in

the field. It will take some practice to get the hang of. The best method is to hold the tin with both hands and

send with your thumbs.

When the alternative paddle mode is active, the keyer code speed is selected using the frequency tune up and

tune down switches, as it would be in straight key mode. Code speed increments are at normal 1 wpm steps.

DFE mode can be used as can entering in keyer memories. Reverse paddle option does not affect the dot and

dash sense of these switches.

electing alternative or normal paddle modes:

Clicking the SPLIT switch toggles between these two modes. An “A” (alternative) or “N” (normal) is annunciated

indicating the mode selected. Escape and store by clicking MENU.

Toggling between receive and transmit modes:

There has to be a method of toggling the function of the tune up and down switches between normal frequency

tuning and transmitting. This is done by a short click of the SPLIT switch. A 't” will appear on the display when the

switches are in transmit mode. There is a ½ second delay after clicking the split switch before the mode toggles

between transmit or receive. This allows using the split switch to activate one of the keyer memories as would

normally be followed by a short click of the split switch.

traight key mode:

Straight key mode is automatically detected and enabled when the rig is powered up when a monaural plug is in

the paddle jack. The sleeve of the mono plug grounds the dash input, which enables straight key mode. Straight

key mode also allows use of an external keyer if one so desires.

Operating voltages:

The ATS-3B has been optimized for operation at 9 volts, with a minimum operating voltage of 6 volts and a

maximum of 12.0 volts. Since power output is dependent on supply voltage, power output will vary from a low of

about 900 mw at 6 V and up to about 5 watts at 12 volts.

NOTE: Since there is no fuse or current limiting in the rig, it is a good idea to use an in-line fuse in the power

supply cord. A 1 amp fuse for supplies of 9 volts or less and 2 amp fuse for supplies above 9 volts.

HIGH SWR CAUTION: If operating the ATS-3B with supply voltages greater than 9 volts, please ensure there is

a low SWR load connected to the rig. High SWR conditions (especially those which are reactive) when operating

above 3 watts output may cause the PA stage to become unstable or cause the PA FETS to be damaged. Be

very careful when using a fully charged gell cell to power the rig!

Spare DC power plug:

Mouser part number 1 1-3218-EX $1.22

Reprogramming the MPU.

There is a row of pads above the MPU labeled “programmer”. These bring out the programming pins for the

MPU, so that the firmware can be upgraded or changed. Several people have modified the firmware to provide

additional or different features to the rig. To reprogram the MPU, a simple level shifting interface must be

constructed to go between a PC with a parallel port and the programming pads on the main board. As shown

below:

In addition to the interface, you will need to install the MPS430 IAR development program to your PC. This

program can be found in the MPS file folder with the name “FET_R451.exe” Double clicking on this will start the

installation program.

The file folder labeled “MSP” on the CD should be copied to your hard drive, either in the C root directory or “My

Documents” folder. Open the IAR program and select “open existing project” from the dialog box and direct it to

look in the MPS folder. The project “ATS3B_digi should show up and select that and click OK.

The source code file will now be displayed and can now be worked on if so desired. To reprogram the MPU with

this file, connect the programming cable to the LPT1 parallel port of your PC, apply power to the ATS3B board

and then plug the header pins from the interface cable into the board. The ground pin end goes into the pad hole

to the left of the MPU, as seen with the MPU below the programming port pins. A SIP socket is not needed for

the pins, the fit into the board is tight enough to the pins in the SIP plug to make reliable contact.

Now click on the C-Sky icon in the tool bar (looks like a magnifying glass) and the programming should start.

If you wish to program a different file into the MPU, add that file to the MPS folder and then add it to the list of

files. Click on that file name to make it active and proceed as above.

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