# SUPER Tuna ][+ Builder s Guide

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1 SUPER Tuna ][+ Builder s Guide Ver2.3 Rex Harper W1REX 3/25/2015

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6 The first thing you should do is to familiarize yourself with what you are going to build. The previous 3 pages are schematics of the current version of the SUPER Tuna ][+ transmitter. Sheet one depicts the circuitry of the main oscillator/transmitter functions of the SUPER Tuna. Sheet two shows the various ancillary circuits such as keying, power measurement and muting while the third sheet documents the circuitry and construction of ALL the band module options currently supported. The SUPER Tuna ][+ is new but the band modules are from the original SUPER Tuna ][. The ][+ schematics show a slightly different nomenclature for the components on the band modules. Sheet 4 details the nomenclature differences between the ][+ schematics and the actual ][ band module. You don't have to memorize the circuitry but you should have a basic knowledge of what's what and who is where? (On first base!) The second thing that you need to do is break out all the parts, sort them and check that everything has been included in the can. I'm not a 100% perfect kitter! Every kit is kitted by hand and sometime VERY late at night (when everyone else is sleeping and aren't making demands for my time). So sometimes I forget a part or it bounces out of the cup right as I drop it in and I didn't see it bounce...what with only one eye open at that late hour. So check the parts and let me know if anything is missing. The third thing that you should do is read completely through the guide, maybe a couple of times, so that you are familiar with all the steps and how the construction goes. Knowing whats going to happen a little later on helps you make better decisions earlier in the build.

7 SPT][+ Bill of Materials Resistors R1 = 47k R2, R5, R10 = 470 R3 = 120 R4, R8 = 2.2K R6 = 39 R7 = 33 R9 = 10K R11, R12 = 1K R13,R14 = 100 2W Potentiometers P1 = 500 or 1K ohm linear P2 = 10K or 50K linear Capacitors C2, C4, C14 = 47 C3 = 100 C16 = 150pf C13, C17 = 330pf C15 = 680pf C7 =.01 C1, C5, C6, C8, C9, C11, C12 =.1uf C10 = 10uf VC1 = 60pf polyvaricon Diodes D1 = 1N5818 D2 = 1N5711 D3 = 1N4148 D4 = LED keying LED Pots Optional x2 ZD1 = 33V 1W Zener ZD2 = 5.1V Zener RF Chokes/Transformer L1, L2 = 10uh T1 = FT37-43 (25t P & 5t S) L3, L4 = T50-2 toroid Transistors Q1, Q2, Q5 = PN2222A Q3 = 2N3866 (TO-5 house branded CG9949 or similar) Q4 = 2N3906 Jacks/Connectors J1, J6, J7, J8, J11 = 2-pin st. male header J2, J3 = RCA J4, J5 = 10-pin header socket J9 = Stereo phone jack J10 = 14-pin header socket J12 = 3-pin st. male header optional 3-pin Swiss pin socket (Q3 socket) J7, J8 =.1 shorting plugs Other 28ga. Magnet wire for 50 turns PCB ST][+ PCB Polyvaricon Mounting PCB Band Module VC1 = Knob Q3 = Heat sink VC1 = 2.5 x 3mm screws x2 VC1 = ¼ x ¼ shaft ext. VC1 = 2.5 x 8mm ext. screw Sw = SPDT switch w/.1 spc Can 1/8 x1.5 x32 screw & nut Xtal

8 Install all the ¼ watt resistors flush to the surface of the board. Bend the leads with.4 spacing, insert them into the proper holes then spread the leads apart slightly where they exit the bottom of the board. The resistors should stay in place when you turn the board upside down. You can use the open can as a holder for the board while soldering. Place the board upside down on the top of the can and solder Install the resistors in small batches, bending, soldering and clipping off the excess leads in comfortable batches until all of them are installed. Batching will make the build quicker. Install: Lead Benders are handy! R1 = 47k ( yellow-violet-orange) R2 = 470 (yellow-violet-brown) R5 = 470 (yellow-violet-brown) R10 = 470 (yellow-violet-brown) R3 = 120 (black-red-brown) R4 = 2.2K (red-red-red) R8 = 2.2K (red-red-red) R6 = 39 (orange-white-black) Bend leads apart to hold.. R7 = 33 (orange-orange-black) R9 = 10K (brown-black-orange) R11 = 1K (brown-black-red) R12 = 1K (brown-black-red)

9 Install the small monolithic capacitors on the main board. Install them flush to the surface of the board. Again, bend the leads apart slightly where they exit the bottom of the board. Turn the board upside down on the top of the can and solder All the cap pads have.1 spacing but some of the caps might have leads pre-bent at.2. You might have to re-bend them to.1. Make sure that you don't stress the cap where the lead enters the body of the cap. Install the capacitors in small batches, bending, soldering and clipping off the excess leads in comfortable batches until all of them are installed. Install: Re-bend? C4 = 47pf (marked 470) C3 = 100pf (marked 101) C7 =.01uf (marked 103) C1 =.1uf (marked 104) C5 =.1uf (marked 104) C6 =.1uf (marked 104) C8 =.1uf (marked 104) C9 =.1uf (marked 104) C11 =.1uf (marked 104) C12 =.1uf (marked 104)

10 Now it is time to install the diodes. Diodes install the same way as resistors except for one thing: diodes have a POLARITY. The diode type is marked in teeny tiny lettering that I need to use either a magnifying glass or visor to read. There is also a solid stripe or band at one end of the body indicating the POLARITY. Orient the diodes with the band matching the band marker on the silk screen. Install: D1 = 1N5818 (.4 spacing ) D2 = 1N5711 (.3 spacing ) D3 = 1N4148 (.4 spacing ) ZD1 = 33V 1W zener diode ( BZX85C33 or equivalent ) (.4 spacing ) ZD2 = 5.1V zener diode ( 1N4733 or equivalent ) (.3 spacing )

11 The inductors (or chokes) are next. They look very similar to resistors and have the same colors for marking their values. The two small chokes used on the SUPER Tuna][+ circuit are both 10uh chokes and are a little tubbier than a resistor. Since you installed all the resistors already, the chokes should be pretty easy to find Install: L1 = 10uh choke (marked brown-black-black-gold) (.4 spacing ) L2 = 10uh choke (marked brown-black-black-gold) (.5 spacing )

12 There are 5 transistors in the SUPER Tuna][+ circuit. Four transistors are soldered directly into the board while the power transistor, Q3, is installed into a make-shift socket. Transistors have POLARITY and should be oriented such that the flat face of the transistor matches the flat face on the silk screen marking. The transistor type is printed on the face for easy identification in my case ONLY using a good light AND a magnifier! Install: Q1 = PN2222A Q2 = PN2222A Q3 = 2N3866 (marked DG0001 or CG9949 (or similar) is a house branded part) Q4 = 2N3906 Q5 = PN2222A Transistor Q3 is mounted in socket pins made from individual pins cut from a 3 or 8-pin SIP socket strip. Cut the 3 pins from the strip and carefully press them onto the leads of transistor Q3. Form the leads of the transistor and dry-fit them into the Q3 pads so that the socket pins are vertical to the board. Solder 1 pin when you are happy with the fit then the rest after a check. Remember that when you go to replace the transistor at a later date, it will be much easier to replace when the socket pins are oriented uniformly vertical for easy insertion of the new transistor.

13 Install some miscellaneous parts. 2x5x.1 header connectors at J4 & J5 power RCA connector or optional 1x2 screw terminal block at +12V 10uf at C10 polyvaricon cap mounted to small mounting pcb at VC1 You might have to cut some tiny plastic feet off the RCA connectors. When installing components that easily fall out when you turn the board over for soldering, a helpful hint is to set the iron in the empty tuna can with a weight on the cord to hold it in place. Now you can hold the part in place AND board with one hand while adding the solder with your second hand. A bench-top vice is also a handy device for holding your soldering iron for those situations where you can really use a third hand. Solder only ONE pin of the header connectors, then inspect the top side for nice vertical placement of the header before soldering the rest of the connections.

14 Install the polyvaricon mounting board at VC1. There are solder pads at the bottom of both sides. Take care to center the board left & right so that the potentiometers will fit later on. Of course, I use an SBSS tool to help solder the board square. The polyvaricon is mounted to the small printed circuit board using two small 2.5x3mm screws. The two front leads of the polyvaricon fit fine but the back lead needs to be thinner to fit the pad hole. Use some sharp side cutters to cut off the sides (a little only!) of the lead to thin it some. Dry fit the cap and trim the lead until it fits. Insert the leads into the pad holes and then mount the cap with the tiny screws. Solder the leads and trim the excess. Tuning cap knob Some polyvaricon caps have a shaft long enough to mount the supplied knob while others are VERY short. For those short shaft pots, you will have to mount a small extension shaft using the supplied 1/4 nylon spacer and 2.5mm x 8mm screw. Once installed on those short cap shafts, the knob can be mounted on the nylon spacer.

15 Now for some more miscellaneous parts: LED - keying indicator at D4 1x2x.1 male header at PWR 100ohm (brn-blk-brn) power resistors at R13 & R14 SPDT switch at Sw. The power resistors are mounted vertically. The holes on the SPDT switch might be tight but persistent pressure and wiggling will coax the switch into the holes. The silk screen POLARITY marking for the cathode (-) of an LED is a flat side of the LED circle. Orient the LED so that the flat (or shorter LED leg) side of the LED matches the the flat on the silk screen marking. If you don't have a flat side on the LED, the shorter of the 2 leads would be the lead to install in the hole associated with the flat end of the LED.

19 Transformer T1 soldered into position. The SUPER Tuna board can now be mounted on the tuna can using the 1.5+ x #6 bolt and nut. Screw the bolt in from the top of the board and then down into the can. The nut will thread onto the bolt where it comes out of the bottom of the can. Don't over tighten the nut. It is used only to pinch the board and can together. The one remaining thing to build is the band module board. The SUPER Tuna can be easily moved from band to band by simply swapping out the band module. The only components that need to change when moving the SUPER Tuna about the bands are the crystal and low pass filter. Hence, they a mounted on a small band module board for maximum flexibility.

20 I use the SBSS mounted in a Gorilla Pod camera tripod to hold the board for soldering AND taking pictures! Install the 5 caps for the low pass filter and the two 2x5x.1 right angle male header plugs. For the 40m band module board: C14 = 330pf marked 331 C15 = 47pf marked 470 C16 = 680pf marked 681 C17 = 150pf marked 151 C18 = 330pf marked 331 Swap the board around in the holder and.. Install the oscillator cap C13 C13 = 47pf marked 470 Install the 40m crystal and then use a piece of cut component lead to ground the case to the pad just below (above in the picture) the Q in FREQ. You could also install a 3 pin SIP socket (with center pin clipped off) in the crystal pads which would allow you to plug in various crystals in order to move about the band. This might be more desirable on 40m band modules where there are many available crystals for the 40m band. Of course, this mod would make the crystal a potential source of problems where the connection and mounting are both flimsy. LIGHTLY tinning the crystal leads would make them fit into the SIP sockets a little tighter. Don't tin them too much...

21 Now you get to have some more fun winding toroids. L2 and L3 on the band module are the same value. They are 2.2uH or 21 turns on T50-2 toroids or 23 turns on T37-2 toroids. Check the size of the supplied toroids: 3/8 diameter are T37s and 1/2 diameter toroids are T50s. Wind the toroids, 'dry fit' them and prepare the magnet wire for soldering same as with the previous transformer. Install the toroids flat against the band module board and secure them to the board using the nylon screws. Now solder the wires and clip off the excess. Use a clipped off component lead and solder in a jumper across either L4 or C19. This will bypass the 3 rd filter section which is not required. The layout of the band module board is quite generic and will allow you to install filters from other sources... Completed 40m band module Install the band module board into the header connectors on the main tuna board, You should now be ready to check out the operation of the transmitter. Switching the switch to Power will place a built in dummy load on the output of the transmitter. Applying power, you should be able to key the transmitter and follow the keying by watching the LED. You can verify the power output by measuring to output voltage at the 2 pin male header marked PWR using a digital multimeter. You should get about 2 watts out of the SUPER Tuna which is about 20 volts.

22 You can now mount the heat sink onto transistor Q3. It is much easier if you take the transistor out of the socket and push it into the heat sink rather than attempt to push the head sink onto the transistor... Reinstall the transistor/heat sink combo into socket Q3. Completed SUPER Tuna ][+ transmitter!

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