K9EQ AH-4 Universal Interface
Rev. 5
Page 1
www.hamoperator.com
User’s Manual
Страница 1: ...K9EQ AH 4 Universal Interface Rev 5 Page 1 www hamoperator com K9EQ AH 4 Universal Interface User s Manual ...
Страница 2: ...face 5 Construction 5 Basic Version 6 Optional components 7 Construction Notes 8 Component Identification 9 Verification 9 Initial Basic Version Checkout 9 Initial Full Version Checkout 10 Final Basic Version Checkout 10 Final Full Version Checkout 11 Circuit Description 11 Installation 12 Operation 14 Basic Interface 14 Tuning 14 Setup 15 Power output control using AM mode 15 Full Interface 15 ...
Страница 3: ...loop I built in the garage was with Belgium I looked at other antenna tuners on the market and concluded that the AH 4 was the one I wanted to use It is well designed rugged and priced very competitively From my point of view it had only a few disadvantages The documentation that comes with the tuner is not very good and I couldn t use it with my other radios While I really like the 706 I d like t...
Страница 4: ...following advantages over conventional wide range automatic antenna tuners o Tuning is accomplished using about 10 watts of power from the radio o The power from the radio is split between a dummy load and the antenna thus the radio sees a maximum SWR of 1 1 1 while tuning this prevents damage to the rig s finals o A maximum of 350 mW is radiated during tuning minimizing QRM Other hams will apprec...
Страница 5: ...e rig s output is for a given audio level Full Interface The full interface adds the following features to the basic interface o The interface generates an adjustable negative ALC voltage This reduces the transmitter s output when tuning Note that this feature could require frequent adjustment since the radio s characteristics may change with temperature and voltage o An RS 232 interface that allo...
Страница 6: ... following options are also available o LEDs on PCB o LEDs mounted remotely External buttons and LEDs allows more flexibility in mounting while onboard components make it simpler to build and get working Basic Version The basic version requires the following parts C1 C2 C3 C4 C5 C6 C7 C8 C17 C18 D1 D2 D3 D4 D5 D6 J1 J2 J3 L1 L2 L3 Q1 Q2 Q3 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R13 R14 R15 U1 U1S U2 X1 PB...
Страница 7: ...ts are not required and may be substituted as follows with the corresponding change in protection RF immunity or feature Required substitute action and change is indicated F1 short provides short circuit protection D6 short provides reverse voltage protection L1 L3 short provides RFI protection D4 R6 open provides power on indication ...
Страница 8: ...ith lettering upright Refer to Figure 2 for parts placement Use the photograph on the cover of this manual for additional parts placement assistance It is recommended that you use a DVM to verify the component values of the resistors A magnifying glass may be useful for reading other component part numbers and values When looking at the front flat side of the 78L05 with the pins down the pins from...
Страница 9: ...ats Component Identification Component Identification or Marking 100 ohm resistor brown black brown 220 ohm resistor red red brown 1 k resistor brown black red 4 7 k resistor yellow violet red 100 k resistor brown black yellow 22 pf capacitor 22 001 uF capacitor 102 1 uF capacitor 104 10 uH inductor Green body brown black black Verification In the following steps a 9 volt battery may be used as a ...
Страница 10: ...erify the voltage at U3 6 is approximately 8 5 volts 4 Turn the power off While pressing the TUNE button apply power Measure the voltage J2 2 While pressing TUNE adjust R12 The voltage should be adjustable over the approximate range of 0 75 to 0 5 volts The voltage should go to zero when TUNE is released Press TUNE and adjust R12 for minimum output full counter clockwise Final Basic Version Checko...
Страница 11: ...Similarly when the microprocessor U1 asserts Tx Q2 and associated components cause the HF rig connected to L2 to key This design assumes that the HF rig is solid state and uses an approximately 13 8 V control line shorted to ground to key the transmitter If this is not the case for your radio additional interface circuitry may be required When the KEY IN signal from the AH 4 is asserted brought to...
Страница 12: ...ide a voltage divider to interface the high level output of the rig to a microphone input on the computer sound card C19 provides DC isolation R16 and R17 provide a voltage divider to interface the line output of a computer sound card to the auto patch input of the rig R16 allows adjustment of the output level C8 provides DC isolation R23 limits ground loop currents to reduce hum The microprocesso...
Страница 13: ... 3 Audio input mic level Audio output to rig Connect only if using audio tone to generate RF output for tuning J2 4 GND Connect to rig for main ground J2 5 13 8 Power in For PSK31 operation with a computer add the following connections Interface Rig Computer Comment J4 1 GND Audio GND to computer w series resistor to minimize ground loop currents J4 2 Line in Audio out to computer J4 3 Line out Au...
Страница 14: ...The status LED will begin to flash and the rig will key on the air Within a few seconds the rig should unkey and the status light should remain on This indicates that the AH 4 is in line and tuned to the rig s frequency 6 Readjust the rig s mode and power and being operation Note that if the AH 4 does not tune because you are running SSB and are using the audio interface you can adjust the mic gai...
Страница 15: ... to change the power output during tuning Power output control using AM mode Many radios on the market allow you to adjust the AM carrier output level This can be used as a convenient way to adjust the power output during tuning Simply set the carrier output to about 10 watts Set the rig s mode to AM prior to tuning and hit the TUNE button Return the rig to your desired mode when tuning is complet...
Страница 16: ...ard interface turn speech processing off With the mic gain set to a normal position adjust R16 for the correct RF output level for the mode you are using Visit www hamoperator comfor links to software that can be used to test the interface Troubleshooting Visit www hamoperator comfor late breaking news and to post comments and questions regarding the interface Symptom Funny things happen when tran...
Страница 17: ...6 of U3 Sympton My PSK31 program will not key the rig Solution Power the board off and on again see above for DTR disable Configure the software to assert DTR to key the transmitter Symptom When I key the radio the RF output shoots up even when I m not tuning This is particularly bad when I turn up the mic gain Solution Audio may be getting into the radio via a ground loop between the interface po...
Страница 18: ...T J 2 1 C 2 001uF D 2 Q 2 2 N 3 9 0 4 R 2 4 7 k K E Y I N J 1 1 L 3 1 0 u H C 3 001 uF R 3 4 7 k D 3 Q 3 2 N 3 9 0 6 R 5 1 0 0 k R 4 4 7 k 1 3 8 V I N J 2 5 J 1 4 J 4 1 1 3 8 O U T J 1 3 C 5 10uF C 4 10 uF 5 3 2 1 7 8 L 0 5 U 2 D 6 R 1 0 1 0 0 R 6 2 2 0 D 4 G r e e n S T A R T TX K E Y J 4 4 R I G A U D I N J 4 3 C O M P A U D I N C O M P A U D O U T J 4 2 1 K R 1 6 0 1uF C 1 9 4 7 K R 1 7 T X A U...
Страница 19: ...1 22pF C 7 2 4 5 7 6 M H z X1 22pF C 6 4 7 k R 7 4 7 k R 8 2 2 0 R 9 D 5 5 C 8 0 0 1 S T A R T K E Y TX 5 1uF C 1 1 1 u F C 1 2 1uF C 9 1uF C 1 0 5 1 2 3 4 5 6 7 8 9 J 5 R S 2 3 2 R 1 3 4 7 K C 1 7 1uF R 1 4 1 K R 1 2 5 K R 1 1 0 K J 2 2 TX ALC J P 1 2 J P 1 1 J 4 6 D a t a f r o m r i g J 4 7 Data to rig T X A U D J 3 3 U N T U N E J 3 4 T U N E C 1 5 001uF D 7 C 1 C 1 C 2 C 2 V V V c c G N D T1o...
Страница 20: ...U N E U N T U N E K 9 E Q A H 4 U n i v e r s a l I n t e r f a c e R e v 2 b I n t e r f a c e C o n t r o l s C o n n e c t i o n C o p y r i g h t 2 0 0 1 2 0 0 2 K 9 E Q a n d H a m O p e r a t o r c o m J 3 3 J 3 4 J 3 5 J 3 8 G r e e n D 1 R e d D 2 J 3 1 J 3 2 ...
Страница 21: ...sub D female PC mount Digikey A2100 ND L1 L2 L3 3 3 Inductor 10 µH Digikey M7825 ND PB1 PB2 2 2 Push Button Momentary Jameco 162886 Digikey P8006S User supplied external PCB 1 1 Printed Circuit Board K9EQ PCB01 001 Q1 Q2 2 2 Transistor NPN 2N3904 General purpose Jameco 178597 Digikey 2N3904 ND Q3 1 1 Transistor PNP 2N3906 General purpose Jameco 178618 Digikey 2N3906 ND R1 R4 R7 R8 R13 R15 R17 R18 ...
Страница 22: ...8 ND Pins for above 4 4 Pins for above Molex 02 09 1104 Digikey WM1101 ND J1 1 1 Connector 4 pin Molex KK optional Digikey WM4202 ND st or Digikey WM4302 ND rt ang P1 Mating connector to J1 1 1 Connector 4 pin Digikey WM2002 ND J2 1 1 Connector 5 pin Molex KK optional Digikey WM4203 ND st or Digikey WM4303 ND rt ang P2 Mating connector to J2 1 1 Connector 5 pin Digikey WM2003 ND J3 J4 1 2 Connecto...
Страница 23: ...ximately 250 ms after the AH 4 starts tuning the radio removes the START signal 7 When tuning has been achieved the AH 4 removes the KEY signal and switches the RF to pass only through the tuning network The microprocessor is then halted The radio stops transmitting when the KEY signal is removed 8 If the AH 4 was unable to achieve tuning it removes the KEY signal for 20 ms asserts it again waits ...
