Texas Star Variable CW Transmitter - Mod V
• 1-2SC2290
• 100w+ output
• 14A fuse
• Variable Power                                                                                                                                                            
• Receive Pre Amp
• Automatic SSB• A crystal must be installed to determine the frequency of operation
• v+, mod v+, amp, amps, amplifier

 Texas Star DX250HDV CW Transmitter
• 2-2SC2290
• 250w+ output
• 26A fuse
• Variable Power
• RF power meter                                                                                                      
• Receive Pre Amp
• SSB switch
• A crystal must be installed to determine the frequency of operation
• dx250, dx 250, dx250v, amp, amps, amplifier

 Texas Star DX350HDV CW Transmitter
• 2-2SC2879
• 350w+ output
• 30A fuse
• Variable power                                                                         
• RF power meter
• Receive Pre Amp
• SSB switch
• A crystal must be installed to determine the frequency of operation
• dx250,dx 250, dx250v, amp, amps, amplifier, 250

 The famous Texas Star DX1600 otherwise known as the Sweet 16. (8) 2SC2879s can be driven with a superwackpacked 95T2, or 48T. You can use just a dual final radio to drive it as well to keep it cooler. Add a dual final radio, and a modulator and get a big sound! This is one versatile amp. While its not cheap, its built to last. Optional items include fan kit, and remote.
Texas Star DX1600V NEW 10 pill Amplifier!!
2 amps under one cover! What you get is a Texas Star DX350, and a Texas Star DX1600. Get everything under one cover, including a fan kit. You can run just the driver, you can run just the 8 pill, or you can run both! Texas Star doesn't get better.
WE ARE A AUTHORIZED TEXAS STAR DEALER...don't be fooled by low prices. If your amp needs factory service, we've got you covered! IF your amp needs out of warranty service..WE DO THAT TOO! Call for details!

 Texas Star DX400V CW Transmitter
• 4-2SC2290
• 400w+ output
• 40A fuse
• Variable power                                                                            
• RF power meter
• Receive pre amp
• SSB switch
• A crystal must be installed to determine the frequency of operation
• dx400, dx400v, dx 400, amp, amps, amplifier

 Texas Star DX500HDV CW Transmitter
• 4x2SC2879
• 500w+ output
• 45A fuse
• Variable power

• RF power meter
• Receive pre amp
• SSB switch
• Can be used with Texas Star 100w modulator
• A crystal must be installed to determine the frequency of operation
• dx 500, dx500, amp, amps, amplifier

 Texas Star DX667V CW Transmitter
• 1-2SC2290 x 4-2SC2879
• 650w+ output
• 60A fuse
• Variable power
• RF power meter
• Receive pre amp                                                                                      
• SSB switch
• A crystal must be installed to determine the frequency of operation
• dx 667, dx667, dx667v, amp, amps, amplifier

Step 1. Melt the wax or epoxy seal with soldering iron. Also make sure your alignment tool fits well in the slot.
Step 2. Cut D11 AM Limiter.
Step 3. Tune for max L14, L13, and L12 for max swing on channel 20, AM
Step 4. If possible inject 600 hz tone into mic, or say auuuudio, while tuning for max.
Step 5. Gently spread apart L12 coil while monitoring on meter for max swing.

• 1- 220uf electrolytic capacitor 10-16 v
• 1- 100 to 200 ohm resistor 1/4 or 1/2 watt

Step 1. Unsolder jp6 near the final. Step 2. Solder a 220uf capacitor with the negative facing the final where jp6 was removed Step 3. Solder a 100 ohm resistor across the capacitor leads on the solder side of the board.

Step 1. Note the 2 wires connected to the RF GAIN. Trace them to the pc board and unsolder. Step 2. Solder a jumper at this point. Step 3. Solder the 2 wires to the capacitor you installed earlier under MODULATION.

L38
TR24 = AMC
VR11 = ALC
VR10 = AM PWR
Note: If the ALC has been clipped, its best to restore it.
TR24 is a 2SC945AO

1. Remove D52.
2. Lift the hot (orange) Clarifier wire from the board, and connect to pin 3 of IC4 (MB3756).
3. Slide range can be increased by jumpering or lowering the value of R174 or R175, or both.
4. Varctor is D35. Adding a 5.6uh coil to the anode will also increase slide range further.

(Increases tuning range to approximately 14khz) 1. Remove D52.
2. Lift the hot (orange) Clarifier wire from the board, and connect to pin 1 of IC4 (MB3756).
3. Clip or remove R44.
4. Center Clarifer control and realign the radio

TR17 is a 2SC1674. Its a high noise package.
Changing TR17 to a 2SC2999 offers higher amplification of weak signals, and low noise.
Re-Adjust L4 and L5. The gain will improve more than 6db with the same signal to noise ratio.

L9
L16
RV14 AMC
RV13 SSB Mic Gain
RV5 ALC
RV15 AM PWR

1. Remove D7.
2. Remove the hot wire (+8VDC RX-Only) from the board and connect instead to the emitter of Q28 main voltage regulator.
3. Slide range increased by adding 5.6uh inductor in series with +end of varactor D5

Remove JP54. Solder a 4.7K resistor in its place. Locate a +8 volt source. You can find one along the PC board near the front of the radio. Or from the band switch. conect the 8 volts to pin 9 of IC6. (If you install the resistor standing up, with the body nearest the center of the radio, you can connect the connect the 8volts to the leg of the resistor closest to pin 9) I used the CH9 for this. Remove the existing wires from the CH9 switch , and solder the white and pink wires together. Connect the 8 volt to the center pole of the switch and the top terminal of the switch to pin 9 of IC6. When its in the CH9 position, you have a 10KC shift. Giving you the "RC" channels, as well as channel 41 in the high band

Cobra 19 LTD

Modualtion and Power:

1. Remove battery.
2. Remove channel and volume knobs.
3. Remove retaining rings at antenna and volume controls.
4. Move SP/MIC cover out of the way.
5. Remove 2 screws from rear of radio.
6. Carefully remove radio from plastic case.
7. Locate 3 SMT diodes near power button, remove the TOP DIODE ONLY.
8. Remove the SMT resister under the bottom diode.
9. Reassemble the radio, being careful to not pinch any wires.
10. Power up the radio, it may need to be reset.

The new TX range is now 137-172, 216-235, and 416-469

EMPEROR TS-5010

• 1)Remove bottom cover.
• 2)Locate the PLL/CPU board at the front of radio.
• 3)With the front of the radio facing you, locate R539 and R540 at the lower right corner of the large chip(HD614081).
• 4)Remove these two resistors.(or use a set of diagonal cutters and just cut the leads)
• 5)You will now have 26.500 to 30.200 coverage in 9 bands.

Channel Expansion
COMING SOON

VR 1..............AM S-Meter 
VR 2.............SSB S-Meter 
VR 3.......SSB Squelch Range 
VR 4........AM Squelch Range 
VR 6.....SSB Carrier Balance 
VR 7...............TX Offset 
VR 9................RF Meter 
VR10..............Final Bias 
VR12.............Driver Bias 
VR13.................SSB ALC 
VR14...........AM High Power 
VR15.....AM Modulation Meter 
VR16...........AM Modulation 
VR17...............SSB Power 
VR18............AM Low Power 
VC1..................10.240 

Galaxy Melaka

Channel Expansion

1) Remove top and bottom covers and open the radio.
2) Find a small jumper wire on the bottom side of the main board towards the front.
3) This wire is soldered to ground as well as 2 pins.
4) Unsolder both ends of the wire.
5) Make sure the 2 pins are no longer shorted together.

Tweak & Peak

Audio Limiter - VR-14
AM Power - VR-13
SSB Power - VR-12

Galaxy 44V

Channel Expansion

1) Open the radio.No Really?!?
2) Find the small circuit board on the left of the radio.
3) Cut the green wire and tape it off.
4) There is an unplugged connector by this board..plug it in.
5) Near the front of the radio there is a connector marked +10K. Reconnect the plug to the board.
6)That's it. You now have 8 bands of 40 channels.25.165-28.755.

Tweak & Peak

Audio Limiter - R249
AM Power - VR13

Galaxy 55V

Tweak & Peak

Audio Limiter - TR53
AM Power - VR13

Galaxy 66V

Channel Expansion

1) Open the radio.No Really?!?
2) Find the small circuit board on the left of the radio.
3) Cut the green wire and tape it off.
4) There is an unplugged connector by this board..plug it in.
5) Reconnect the plug to the board.
6)That's it. You now have 8 bands of 40 channels.25.165-28.755.

Tweak & Peak

Audio Limiter - TR53
AM Power - VR13

Galaxy 73V

Channel Expansion

1) Remove the bottom speaker cover.
2) Remove the screw holding the small silver freq. counter module.
3) Locate the loose 8 pin connector and plug it in to J1.
4) Clip the short jumper wire on the rear corner of the microprocessor board.
5) That's it. You now have 8 bands of 40 channels.25.165-28.755.

Dual Watch

1. Locate the cut yellow and gray wires on J2
2. Locate the cut yellow and gray wires in the wiring harness
3. Solder the two yellow wires together and the two gray wires together
4. Tape up the solder splices and replace the speaker cover

Galaxy 88 HL

Channel Expansion

1) Remove the covers on the radio.
2) Find the small long boardon the keft side with the radio upside down.
3) Remove the RED jumper wire on top of that board.
4) Close the radio, plug in the power cord , and turn it on.
5) That's it. You now have 8 bands of 40 channels.25.165-28.755.

Tweak & Peak

Audio Limiter - TR53
AM Power - VR13

Galaxy 99V

Tweak & Peak

Audio Limiter - TR53
AM Power - VR13

COBRA 138 139 XLR (OLD) PRESIDENT GRANT, WASINGTON,MADISON , ROYBN 510 , 520D ,TRC-449 457 AND 458

1)FIND PIN #19 OF THE 858 CHIP.THIS PIN WILL BE CONNECTED TO GROUND WITH A SMALL TRACE. CUT THE TRACE AND SOLDER A 4.7K OHM RESISTOR ACROSS THE CUT .

2)FIND PIN#21 AND DO THE SAME AS YOU DID TO PIN #19.

3)INSTALL A SPDT/CENTER OFF TYPE AND ALSO A SPST SWITCH IN THE CHASSIS OF THE RADIO.SOLDER THE WIRE FROM THE CHIP TO THE 2 SWITCHES AS IN THE PIC ABOVE.

4) TURN THE RADIO ON AND SEE IF ALL THE CHANNELS WORK.IF NOT THE YOU WILL NEED TO "BRAOD BAND" THE RADIO.CUT THE 2 TRACES AND INSTALL THE 2 JUMPERS AS IN THE PIC BELOW.

1)Cut R-117
2)Cut D-30
3)Find the backside of the clarifier knob.Follow the PURPLE and BROWN wires and cut them just before they connect to the PCB.
4)Solder the PURPLE wire to an 8 VDC source.
5)Solder the BROWN wire to GROUND.