KD1JV Designs AT Sprint 3B Operation And Assembly Manual Download Page 1

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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

[email protected]

http://kd1jv.qrpradio.com

Summary of Contents for AT Sprint 3B

Page 1: ...B 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 1 ...

Page 2: ...2 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 ...

Page 3: ...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 3 ...

Page 4: ...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...

Page 5: ...ation 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 receiv...

Page 6: ...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 numer...

Page 7: ...red 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 7 or more dashes will signify the end of that message and the beginning of the next ...

Page 8: ... 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 Prog...

Page 9: ...oggling 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 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 memor...

Page 10: ... 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 LPT...

Page 11: ... a tooth pick or chop stick with the end rubbed into a little bees wax The bees wax makes the end sticky so the part will stick to it For the smaller IC s I grab them length wise with the tweezers Tack the end of a part in its place by applying heat to the end of the part over the tined circuit board pad while applying a little pressure to make sure it lays flat to the board Be sure to heat both t...

Page 12: ... a bunch of your ink jet ink Some parts do not have values marked on them or are very hard to read Capacitors are not marked so these have been color coded with a marker on the part carrier This color matches the color shown on the location guides SOT 23 parts have numbers printed on them but are very hard to read Therefore these parts are also color coded but with a color sticker as they come in ...

Page 13: ...Reference pictures of the front and back sides of completed board 13 ...

Page 14: ...inted out for convenient reference while building Color coded locations match the colors of the corresponding part carrier Part outlines with numbers inside indicate resistors and the resistor value to be placed there Also refer to the photos of the completed board Back side Front side 14 ...

Page 15: ... 1 0805 1133 1 100 u 10V ALUM 1 267 K 1 0805 2673 1 30p GREEN TRIMMER 2 SA612A SO 8 1 LM4808 SO 8 1 0 15 uH YELLOW 1 MPS430F1231 SO 28L 2 3 9 uH PINK 1 AD9834 TSSOP 28 3 10 uH ORANGE 1 74AC02 SO 14 1 60 000 MHz OSC SILVER RECTANGLE 1 74LVC1G3157 CC5R SOT 6 5 4 9152 MHz HC 49US 1 AN6123MS AC SOT 5 1 32 572 kHz SMALL CYLINDER 1 MCP120T 3151 Green SLFJ SOT 3 1 0 2 LED SMT 7 SEG DISPLAY 1 NDT2955 SOT ...

Page 16: ... or black plastic part carrier BACK SIDE Inductors L1 L2 Pink sticker L5 L6 Orange sticker LOC VALUE label SIZE LOC value label size R16 270 271 0805 R27 47 K 473 0603 R17 270 271 0805 R28 47K 473 0603 R18 270 271 0805 R29 47K 473 0603 R1 470 471 0805 R30 47 K 473 0603 R22 2 2 K 222 0805 R31 47K 473 0603 R9 2 74K 1 2741 0805 R32 47K 473 0603 R15 3 6 K 362 0805 R11 100 K 104 0805 R2 10 K 103 0805 R...

Page 17: ...3 7K 1 1372 0805 R35 470 471 0805 R24 22K 223 R36 470 471 0805 R42 22K 223 0805 R37 470 471 0805 R33 47 K 473 0805 R38 470 471 0805 R25 100 K 104 0805 R39 470 471 0805 L7 Orange 10 uH 1206 R40 470 471 0805 L4 Yellow 0 15uH 1206 R41 470 471 0805 L7 Orange sticker L4 Yellow sticker 17 ...

Page 18: ...ttle busy so pay attention to where each value goes Putting a cap is a wrong location can cause some parts of the circuits not to work properly and finding a miss placed cap can be difficult 18 Color Value QTY location Green 0 0 pfd 2 C30 C32 Not Used Orange 22 pfd 4 C1 C28 C29 C33 Brown 47 pfd 1 C31 Purple Black stripe 100 pfd 8 C4 C5 C6 C7 C8 C11 C12 C34 Light Blue Red stripe 470 pfd 1 Not label...

Page 19: ...e U shaped cups near each corner of the part A number of builders have had trouble with this and not made solder connection to the pads under the part A fine tipped iron is required here Also be careful of using too much solder and making a short to the metal top of the package D1 and D4 have very faint lines printed on them to indicate the cathode end Look carefully for these line and face them t...

Page 20: ... SIDE U11 Green sticker SLFJ last two characters maybe different on actual part D1 S2 larger black rectangle Note polarity Faint line on one end of part faces line on board D3 not installed at this time 20 ...

Page 21: ...ou solder them in as their sharp pointy and stick out from the board a bit CT1 Green trimmer The flat side of the trimmer goes towards the line in the outline C59 0 1 ufd mono cap 104 C58 100 ufd aluminum electrolytic Mount the cap on it s side angeling the leads slightly so the body of the cap is above the row of chip parts below it Long lead is Q7 9 BS170 These are mounted with the flat side of ...

Page 22: ...to do this is to make a small loop at the end of the primary turns then continue to wind the required number of link turns Snip the loop to separate the primary winding from the link and twist the link wires together so they don t get mixed up with the primary The link wires go into the two middle holes and the primary the two outer holes as shown to the left If these are mixed up the trimmer won ...

Page 23: ...on The ideal reference frequency of 60 000000 MHz is initially assumed to calculate the DDS VFO frequency In practice the reference oscillator has a 100 ppm tolerance This tolerance can cause a fairly significant error between what the processor thinks the operating frequency is and what it really is The error would be most noticeable on the higher bands where the reference clock is less divided T...

Page 24: ...the main board using short wires or coax If possible use regulated 9 0 volt supply or AA battery pack with new batteries 1 Connect an antenna or signal generator to the antenna input 2 Power up the rig Peak the Rx input trimmer caps for best signal or peak band noise 3 Turn rig off 4 Disconnect the antenna and connect a power meter and dummy load 5 Insert a straight key or paddle into the paddle j...

Page 25: ...ll walk when you drill and the holes will not be centered properly Drilling a clean hole in the tin isn t easy It helps to use a reasonably new and sharp bit Clean up the edges with a small round file and square up the display window with a small flat file The tin will likely deform some around the holes I use the end of my Xacto knife to flatten it back out The bmp drill template can also be used...

Page 26: ... a signal generator available for more intensive troubleshooting If you don t own a Scope maybe you can find someone local with one who would be willing to help you out When using a voltmeter or other probes on the 3 5 and 5 V regulator pins be very careful The input and output pins are adjacent so there is a real possibility of shorting these together If this happens and the raw DC is put on the ...

Page 27: ...E P2 3 5V V P27 3 5V DDS P3 0V ST out P26 3 5V DDS P4 0V GND P25 0V DDS P5 2 7V osc P24 0V Tx key P6 1 7V osc P23 3 5V SPLIT P7 3 5V reset P22 3 5V TUNE DN P8 3 5V Dash in P21 3 5V MENU P9 3 5V Dot in P20 0 3 5V Band volt P10 3 5V Tune up P19 5 to 1 2 Batt V P11 3 5V 7seg P18 3 5V 7seg P12 3 5V 7seg P17 3 5V 7seg P13 3 5V 7seg P16 3 5V 7seg P14 3 5V 7seg P15 3 5V 7seg U6 MPS430 MPU P1 1 13V FS ADJ...

Page 28: ...Schematics Receiver section schematic 28 ...

Page 29: ...29 ...

Page 30: ... and read by any word processing program The software source code is included for those who might be interested in seeing what it takes to run this rig Those who are into assembly language programming may want to get the IAR development package for the TI MPS430 processor so that they can modify and compile the program The development program can be down loaded from the TI web site for free but it...

Page 31: ...we have no room for The output of the AGC chip then goes into a SPDT analog switch This switch is used to mute the receiver by disconnecting the preceding audio stages and connecting the side tone to the audio output stage Finally the audio goes into the head phone driver stage with up to 105 mw of output drive which is also configured as audio band pass filter with a gain of 1 and 600 Hz center f...

Page 32: ...switching occurs at or near the zero crossings so that a 50 duty cycle square wave output is obtained Entering ATS3 B into digital mode operation Click and hold the MENU switch until the letter D is sounded by the side tone and appears on the 7 segment display as a lower case d Once in digital mode only the quick Menu functions of frequency and battery voltage are available The Frequency tune swit...

Page 33: ...adjusted to exactly match the offset in the ATS 3B rig There is likely to be some difference between the exact transmit and receive frequencies fall due to the setting of the BFO trimmer and tolerances in the capacitor values used in the audio filter In order to set the offset correctly you need to set up a separate PSK31 station so that you can talk to yourself Using dummy loads instead of antenn...

Page 34: ... autocq xx Start tx After rx macro go to RX mode for xx seconds and then restart this macro again tx Push the TX button rx Switch to receive mycall Call sign as defined in preferences myname Name as defined in preferences myqth QTH as defined in preferences myloc Locater as defined in preferences myemail Email address as defined in preferences time Local time utctime Universal Coordinated Time dat...

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