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MFJ MFJ-784B Instruction Manual Download Page 6

Summary of Contents for MFJ-784B

Page 1: ...pter 2 Installation 2 1 Back Panel Connections 2 2 Basic Connections 2 3 Setting Receive Audio Level Input Level 2 4 Increasing Headphone Audio Level 2 4 Passing Sidetone 2 5 T R Connection 2 5 CW Sidetone Filter 2 6 DSP to TNC Connections 2 6 Chapter 3 Operation 3 1 Initial Operation 3 2 CW Operation 3 3 SSB and other voice modes Operation 3 4 Front Panel Description 3 6 PWR LED 3 6 Input Level L...

Page 2: ...to Notch Aggressiveness 4 8 Normal Jumper Settings 4 8 Normal Jumper Settings Chart 4 9 Setting the CW Sidetone Filter 4 10 Pre Set Filters 4 11 Data Mode Jumper Settings Chart 4 12 Chapter 5 Filter Description 5 1 LR HR Filter 1 5 2 Band stop Filter 5 3 BP Filter 2 5 4 2BP Filter 3 5 5 CW Filter 4 5 6 CW Sidetone Filter 5 6 SSB Filter 5 5 7 RTTY Filter 6 5 7 HF PACKET Filter 7 5 7 AMTOR Filter 8 ...

Page 3: ...MFJ 784B Instruction Manual iii Appendix A A 1 Self Test A 2 In Case of Difficulty A 4 Technical Assistance A 4 MFJ Pre wired Cables and Open End Cables A 5 Pre Set and Memory Filters Settings Chart A 6 ...

Page 4: ...ption of the digital filters used in this unit The appendix has two important sections troubleshooting and technical assistance There is also a self test for the unit s digital circuitry and controls Refer to these sections if you should have any problem with your new MFJ 784B Important Please read this section to become familiar with the terms and mechanics used in this manual Whenever the manual...

Page 5: ...MFJ 784B Instruction Manual v ...

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Page 7: ...otch off Tunable Filters right knob full counter clockwise widest bandwidth Auto Notch button out auto notch off Noise Reduction control full counter clockwise minimum reduction Noise Reduction button out noise reduction off Volume control full counter clockwise minimum volume Speaker button in speaker on DSP button out DSP bypassed Power button out MFJ 784B off 3 Apply external power and press an...

Page 8: ...to step 7 a Your radio should still be tuned to a SSB station and setup as in step 2 except Power Press and lock the DSP button Adjust the DSP s volume control b Adjust the right Tunable Filters control bandwidth or BW clockwise to make the SSB signal clearer less noise and QRM while not making the signal less intelligible c Adjust the left Tunable Filters control center frequency or fc to peak th...

Page 9: ...ntents of This Chapter Introduction to DSP Page 1 2 Product Overview Page 1 3 Block Diagram Page 1 4 Front Panel Layout Page 1 5 Back Panel Layout Page 1 6 Filter Specifications Page 1 7 Unit Specifications Page 1 8 General Specifications Page 1 8 Input Output Specifications Page 1 8 ...

Page 10: ...used in signal processing The use of special DSP commands allows a DSP filter function to be completed in very few clock cycles usually one The CPU in a typical personal computer would require a long set of instructions and therefore many clock cycles to perform the same function Analog Device s 16 bit 12 MHz processor the ADSP 2105 is used in the MFJ 784B The MFJ 784B DSP Filter converts the anal...

Page 11: ... mode band pass SSB SSB mode band pass The 5 pre set data filters are band pass filters programmed with jumpers for the different data modes mark space frequencies and baud rates RTTY HF PACKET AMTOR PACTOR SSTV FAX WeFAX The tunable manual notch filter attenuates 2 tones manually with the front panel controls The auto notch filter attenuates up to 4 tones automatically The automatic notch will at...

Page 12: ...MFJ 784B Instruction Manual Introduction Error Main Document Only 4 Block Diagram ...

Page 13: ...een is OK Tunable Filters left knob Adjusts tunable filters and manual notch Manual Notch button Enables the manual notch Tunable Filters right knob Adjusts tunable filters and manual notch Auto Notch button Enables the automatic notch Noise Reduction knob Controls the level of noise attenuation Noise Reduction button Enables the noise reduction Volume control Controls the output volume level to s...

Page 14: ...ered Audio Adjust screwdriver adjustable potentiometer Filtered Audio Out RCA phono jack 1 5 V P P 600 ohms Receive Audio Adjust screwdriver adjustable potentiometer Receive Audio In RCA phono jack To Radio 5 pin DIN jack TNC xmit audio ground PTT receive audio in T R To TNC 5 pin DIN jack TNC xmit audio ground PTT filtered audio out For an in depth description of the back panel connections refer ...

Page 15: ...MS Random Noise Reduction6 Entire freq range of selected band pass filter Up to 20 dB LMS Note 1 The LR HR filter becomes a band stop filter when LR is adjusted higher than HR or becomes an all pass filter when LR is adjusted equal to HR Note 2 The 2BP filter uses the bandwidth setting last used in BP filter but allows independent variation of the two center frequencies Note 3 The CW filter has an...

Page 16: ...MFJ 784B Instruction Manual Introduction Error Main Document Only 8 FIR Finite Impulse Response IIR Infinite Impulse Response LMS Least Mean Square ...

Page 17: ...than 175 mA Filtered Audio Out This jack provides approximately 1 5 volts P P into 600 ohm or higher impedance loads The output voltage of this jack is dependent on Filtered Audio Adjust Receive Audio In This jack should be driven in a range of 1 to 2 8 volts P P when Receive Audio Adjust is set to maximum sensitivity When Receive Audio Adjust is set to minimum sensitivity the DSP requires a very ...

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Page 19: ...Contents of This Chapter Back Panel Connections Page 2 2 Basic Connections Page 2 3 Setting Receive Audio Level Input Level Page 2 4 Increasing Headphone Audio Level Page 2 4 Passing Sidetone Page 2 5 T R Connection Page 2 5 CW Sidetone Filter Page 2 6 DSP to TNC Connections Page 2 6 ...

Page 20: ...in 4 of the To TNC port Filtered Audio Out This jack supplies line level audio for tape recorders or audio amps It is a standard RCA phono jack A quality shielded cable should be used for connections to this jack The output is dependent on the Filtered Audio Adjust and independent of the DSP s volume control Receive Audio Adjust This adjustment controls the sensitivity of the Receive Audio In jack...

Page 21: ...84B Instruction Manual Installation Error Main Document Only 3 Basic Connections In the most simple case the MFJ 784B will be installed in the audio path between your receiver and your headphones or speaker ...

Page 22: ...Adjust on the back panel of the DSP until the Input Level LED on the front panel flashes mostly green and never red Note Some compromise may be required if the receiver does not maintain the same audio level on different modes Set the Receive Audio Adjust on the DSP for the most common mode and use the receiver s volume knob to properly adjust the level when switching modes Increasing Headphone Au...

Page 23: ...ut from your radio that is pulled low when the radio goes into the transmit mode such as an output for an external RF amplifier Radio manufacturers call such a line many different names Relay or RLY NO or normally open xmit transmit or send or maybe even PTT If a linear amplifier is connected to the T R line a diode 1N4001 or equivalent should be connected from the linear amplifier s control relay...

Page 24: ...ncy of your radio Refer to page 4 10 for a description of setting the sidetone filter The center frequency of the sidetone filter ranges from 300 Hz to 1000 Hz in 50 Hz increments The bandwidth of the sidetone filter is fixed at 50 Hz DSP to TNC Connections When connecting to a TNC MFJ suggests the use of the 5 pin ports TNCs need a PTT connection that is only available on these ports The MFJ 784B...

Page 25: ...MFJ 784B Instruction Manual Installation Error Main Document Only 7 ...

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Page 27: ...l Description Page 3 6 PWR LED Page 3 6 Input Level LED Page 3 6 AGC Button Page 3 7 Program Button Page 3 7 Memory Button Page 3 8 Filters Switch Page 3 8 Tunable Filters Controls Page 3 9 Manual Notch Button Page 3 10 Auto Notch Button Page 3 11 Noise Reduction Control Page 3 12 Noise Reduction Button Page 3 12 Volume Control Page 3 12 Speaker Button Page 3 12 DSP Button Page 3 13 Power Button P...

Page 28: ...ction button out noise reduction off Volume control full counter clockwise minimum volume Speaker button in speaker on DSP button out DSP bypassed Power button out MFJ 784B off Warning Damage or improper operation may occur if the polarity current or voltage of the supply is incorrect See the installation section on page 2 2 Please don t assume your power supply wiring is correct The external powe...

Page 29: ...f 1 Look at the Input Level LED If it flashes or lights red you will have to decrease the receiver s volume control or adjust the Receive Audio Adjust control on the DSP s back panel towards MIN If the Input Level LED is flashing or steadily green the audio level is acceptable The ideal setting is where the LED is as green as possible without ever turning red Refer to page 2 4 for a longer explana...

Page 30: ... details on this requirement SSB and other voice modes Operation The example in this section demonstrates the basic SSB filter functions and allows for further confirmation of the station receiver audio level adjustments Turn the DSP s Filters switch to SSB mode and place the AGC and NOISE REDUCTION buttons out off Place the DSP button in the out position Tune in a SSB AM or FM station and adjust ...

Page 31: ...you find a frequency that has CW or any other tone interference audible with a SSB or voice signal 5 Place the DSP button in the in position Lock the Auto Notch button in The interference should disappear or be greatly reduced Note The automatic notch will not recognize interfering tones that vary rapidly in frequency or amplitude The filter must ignore rapid amplitude and frequency changes to avo...

Page 32: ...this LED lights red the Tunable Pre Set filters are being used If this LED is green the memory filters called Memory that you can store or program are being used We explain this in detail as we talk about operating the DSP If this LED does not light or does not change color when the Memory button is changed the DSP is not operating correctly Input Level LED This LED lights two different colors red...

Page 33: ... AGC is activated by pushing and locking this button in If the DSP is on and operating pushing the AGC button in will make every signal have nearly the same volume level if the input signal level changes less than 18 dB If there is a lot of noise on the signal you may not want to use the AGC function It will increase the volume of the noise during long pauses in the signal you are listening to Tha...

Page 34: ... is on and the DSP button is in Note Please remember that when we say Tunable the main filter s bandwidth and frequencies can be adjusted by the two front panel Tunable Filters controls Pre Set means the front panel Tunable Filters controls cannot be used to adjust the filter A Pre Set filter s mark space frequencies and bandwidth can only be changed by removing the cover and re programming intern...

Page 35: ...anual notch function uses the same controls as the main filter That means any time the manual notch is being used the adjustable filter cannot be changed The following chart tells you what type of adjustment is made by the left and right Tunable Filters controls in every front panel adjustable filter position Mode Tunable Filters Left Tunable Filters Right LR HR lowest freq you will hear highest f...

Page 36: ... manual notch bandwidth is very narrow Tones within 100 Hz of each notch frequency will be reduced over ten thousand times in volume If you only need to notch one tone set the other Tunable Filters control to any end of its range Doing so will prevent the unused notch from hurting the quality of the signal you want to hear One thing is a little tricky when using the manual notch Since the manual n...

Page 37: ... the auto notch would remove every signal not just the bad ones Second the automatic notch cannot tell the difference between a voice and a tone that varies rapidly in volume and pitch If we made the automatic notch remove all the very fast changing tones it would also remove tones from voices If we made the automatic notch work only on the slowest changing tones it would not follow the drifting o...

Page 38: ...from time delays in the filter and the noise reduction program s effect on random peaks in voices Turning off the AGC on the DSP may also reduce how much unwanted noise bothers you Noise Reduction Button This button turns the noise reduction filter on or off The Noise Reduction button operates in every filter mode including the memory positions Volume Control The Volume control adjusts the audio l...

Page 39: ...s including the Filtered Audio Out jack is no longer held constant The Volume control still functions with the headphones and speaker while the DSP button is out Power Button This button controls the power to the DSP It operates in any position of the Memory button When the Power button is off out this switch connects all the input ports to the speaker and headphones outputs The Filtered Audio Out...

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Page 41: ... Page 4 2 CW Spotting Tone Page 4 4 Measuring Frequency Page 4 4 Talk Page 4 5 Talk Operation Page 4 5 Jumper Settings Page 4 8 Talk Settings Page 4 8 Auto Notch Aggressiveness Page 4 8 Normal Jumper Settings Page 4 8 Normal Jumper Settings Chart Page 4 9 Setting the CW Sidetone Filter Page 4 10 Pre Set Filters Page 4 11 Data Mode Jumper Settings Chart Page 4 12 ...

Page 42: ...ncluding the CW sidetone filter if set and enabled The center frequency and bandwidth or low high reject frequencies of the filters stored in memory cannot be adjusted Only the noise reduction and notch filters can be adjusted while using a memory filter Memory button in If you use several different mark space frequencies program and save several filters while the cover is off Otherwise you will h...

Page 43: ... memory position 1 10 Note From steps 2 4 your filter may not appear to work because the filter position 1 10 is still set to the old memory filter 3 Turn the Filters switch to the position where the new filter is to be saved 4 Press and hold the Program button The LEDs will light red and the DSP will beep in one second Release the Program button This memory position will now operate with these se...

Page 44: ...d the Memory button must be out 2 Engage the filter by pressing and locking the DSP button in 3 Press and hold the Program button to activate the spotting tone 4 Use the Tunable Filters left knob to zero beat match the spotting tone and the CW signal 5 Release the Program button 6 Decrease the bandwidth with the Tunable Filters right knob to eliminate all other signals Measuring Frequency By using...

Page 45: ...otch AN Automatic Notch NR Noise Reduction Talk will send the following settings for a selected Normal or Memory filter filter mode LR HR BP 2BP CW SSB RTTY etc lower and upper cutoff frequencies or center frequency and bandwidth state of the manual notch and its two notch frequencies state of the auto notch and its aggressiveness level setting 1 4 and state of the noise reduction filter and its f...

Page 46: ...e Code message BP CF 1025 BW 350 AN 3 NR 5 This means in memory position 3 you saved a band pass filter with a bandwidth of 350 Hz and center frequency of 1025 Hz The unit also sent the current settings for notch and noise reduction Now suppose you try memory filter 6 Turn the Filters switch to 6 RTTY Press the Program button and the MFJ 784B sends RTTY CF 1360 BW 279 NR 5 In this position you hav...

Page 47: ...BW 404 SSTV FAX WeFAX Non adjustable SSTV 1050 1350 1450 2350 Manual Notch Manual Notch On MN L 150 R 3400 when off MN is not sent Automatic Notch On with aggressive level 3 AN 3 when off AN is not sent Noise Reduction On with control midrange NR 5 when off NR is not sent The digital filter cannot exceed the MFJ 784B design frequency range of 0 3900 Hz or 175 Hz minimum bandwidth in SSB See the Li...

Page 48: ...ld like to step it up a little bit you can reset the jumpers Remember that the automatic notch s distortion of voices will get worse if you choose a more aggressive setting Normal Jumper Settings Except when programming CW sidetone and data filters the jumpers are set for the Talk routine and the auto notch aggressiveness settings After programming a Pre Set data filter or the CW sidetone filter t...

Page 49: ... H H H 1000 Hz JMP JMP Code 4 5 Speed L L 5 wpm L H 10 wpm H L 20 wpm H H 30 wpm JMP 6 JMP 7 Auto Notch Level L L 1 L H 2 H L 3 H H 4 Factory defaults This is what the jumpers should look like for the following settings 1000 Hz Talk pitch 10 WPM Talk Morse code speed and Auto Notch level 1 This is what the jumpers should look like for the default settings 700 Hz Talk pitch 5 WPM Talk Morse code sp...

Page 50: ...e filter set to off If you wish to disable the filter program it with all four jumpers in the H position To set the CW sidetone filter 1 Disengage the Power button and remove the power plug 2 Remove the unit s cover 3 Set the jumpers for the selected sidetone filter 4 Turn the Filters switch to CW 5 Reconnect the power cable 6 Press and hold the Program button 7 Press and lock the Power button to ...

Page 51: ...and remove the power plug 2 Remove the unit s cover 6 screws 3 Set the jumpers for the selected data filter see jumper table on next page Record the Pre Set filter settings with the chart on page A Error Bookmark not defined 4 Turn the Filters switch to RTTY HF PACKET AMTOR PACTOR or SSTV FAX WeFAX 5 Reconnect the power cable 6 Press and hold the Program button 7 Press and lock the Power button to...

Page 52: ...1400 Hz 200 L H H L 1260 1460 Hz 200 L H H H 1430 1630 Hz 200 H L L L 1600 1800 Hz 200 H L L H 2025 2225 Hz 200 H L H L 2110 2310 Hz 200 H L H H 2125 2325 Hz 200 H H L L 1275 1700 Hz 425 H H L H 2125 2550 Hz 425 H H H L 1275 2125 Hz 850 H H H H 2125 2975 Hz 850 JMP 5 JMP 6 JMP 7 Baud Rate L L L 45 L L H 57 L H L 75 L H H 100 H L L 110 H L H 150 H H L 200 H H H 300 Factory defaults Data filter cent...

Page 53: ... Filter 3 Page 5 5 CW Filter 4 Page 5 6 CW Sidetone Filter Page 5 6 SSB Filter 5 Page 5 7 RTTY Filter 6 Page 5 7 HF PACKET Filter 7 Page 5 7 AMTOR Filter 8 Page 5 8 PACTOR Filter 9 Page 5 8 SSTV FAX WeFAX Filter 10 Page 5 8 Manual Notch Filter Page 5 9 Automatic Notch Filter Page 5 10 Noise Reduction Filter Page 5 10 Limited Filters Page 5 11 Overlapped Filters Page 5 12 ...

Page 54: ...ject filter Low removes all signals below a user selected frequency The low reject filter cutoff frequency can be varied between 200 Hz and 2200 Hz with the Tunable Filters left knob The high reject filter High removes all signals above the selected frequency The high reject limit is adjustable between 1400 Hz and 3400 Hz with the Tunable Filters right knob For example If the low reject filter is ...

Page 55: ... settings and passes all frequencies outside the settings of the two filters This special filter is called a band stop or band reject filter A band stop filter makes a hole in the middle of the frequency range and passes everything on either side of the hole For example If the low reject filter is adjusted to 2200 Hz and the high reject filter is adjusted to 1600 Hz all frequencies between 1600 Hz...

Page 56: ...30 Hz to 2100 Hz The Tunable Filters left knob varies the center frequency fc between 300 Hz and 3400 Hz This adjustment is very much like the pass band tuning or IF shift control on high quality receivers For example If the center frequency fc is adjusted to 2200 Hz and the bandwidth BW is adjusted to 600 Hz all frequencies between 1900 Hz and 2500 Hz will pass All frequencies not in the 600 Hz b...

Page 57: ...ilter The bandwidth can be adjusted by switching to the BP position and adjusting the Tunable Filters right knob For Example To adjust the bandwidth of the 2BP filter the Tunable Filters right knob is adjusted to 200 Hz bandwidth while Filters switch is in the BP position The Filters switch is then turned to 2BP Now two filters are available with the Tunable Filters left knob controlling the cente...

Page 58: ...dashes some ringing may appear This is an inherent characteristic of any filter when the bandwidth approaches the on off rate When this filter is operated using a very narrow bandwidth some ringing or softening is inevitable To minimize ringing use the maximum bandwidth possible CW Sidetone Filter Use To pass CW sidetone Passes any signal very near programmed center frequency Note This is not the ...

Page 59: ...fer to monitor himself herself in the transmit mode Refer to the section called Passing Sidetone on page 2 5 RTTY Filter 6 Use RTTY FSK Passes high frequency tones with narrow frequency width The RTTY filter is factory pre set for best performance with standard 2125 2295 Hz mark space frequencies 170 Hz shift 45 baud RTTY signals This filter can also be programmed to one of several different mark ...

Page 60: ... pre set for best performance with standard 2125 2295 Hz mark space frequencies 170 Hz shift 200 baud PACTOR signals This filter can also be programmed to one of several different mark space frequencies and or baud rates This procedure is detailed on page 4 11 Under special conditions the operator may wish to use one of the adjustable band pass filters in place of the PACTOR filter SSTV FAX WeFAX ...

Page 61: ...ent frequency ranges and widths one for the CW filter and one for the other filters When using the CW filter the notch is narrower 45 Hz 40 dB and has a frequency range of 300 Hz to 1000 Hz same as the CW filter In all other modes the notch is wider 85 Hz 40 dB and has a frequency range of 150 Hz to 3400 Hz For Example There is RTTY in your SSB audio After engaging the Manual Notch button use the ...

Page 62: ...e the jumper setting section on page 4 8 Noise Reduction Filter Use Removes random noises such as white noise background hiss etc Removes random noises and passes coherent signals like voices The random noise reduction filter effectively removes noises in the presence of voice with minimal degradation of the voice itself The noise reduction filter works by automatically forming constantly varying ...

Page 63: ...may notice a difference in the front panel controls and the Tunable Filters left and right knob settings Limited filters can only occur in the following filter modes LR HR BP 2BP CW and SSB For example The Filters switch is set to BP The Tunable Filters left knob is set at a 300 Hz center frequency and the Tunable Filters right knob is set to a bandwidth of 2000 Hz Obviously the lower cutoff frequ...

Page 64: ...minus the overlapped region BW BW1 BW2 overlapped region Overlapped filters are not noticeable by the operator However when using the Talk feature an operator may notice a difference in the front panel controls and the Tunable Filters left and right knob settings Overlapped filters can only occur in the following filter modes 2BP and CW with sidetone filter enabled For example The Filters switch i...

Page 65: ...Appendix A 1 A Appendix Contents of This Appendix Self Test Page A 2 In Case of Difficulty Page A 4 Technical Assistance Page A 4 MFJ Pre wired Cables and Open End Cables Page A 5 Pre Set and Memory Filters Settings Chart Page A 6 ...

Page 66: ...ate the nature of the failure 11 Test each button except the Speaker and Power buttons by pressing AGC Program Memory Manual Notch Auto Notch Noise Reduction and DSP buttons Skip the Speaker and Power buttons The LEDs should blink green once after each button push 12 Test the Filters switch by turning it to each position LR HR BP 2BP CW SSB RTTY HF PACKET AMTOR PACTOR and SSTV FAX WeFAX The LEDs s...

Page 67: ...ailure see table below 19 Disengage the Power button and remove the power plug 20 Replace all jumpers from JMP1 to JMP7 to their original positions 21 Replace the DSP s cover 6 screws 22 Reconnect power and resume with normal operation Prefix Number and Its Designation B1 AGC button S1 LR HR switch position B2 PROGRAM button S2 BP switch position B3 MEMORY button S3 2BP switch position B4 MANUAL N...

Page 68: ...power supply you are using may not be filtered properly If the DSP won t start or shuts off intermittently The power supply may not be within the required 10 16 volt range If the power supply drops below 10 volts from poor regulation or a bad connection the DSP may operate erratically An indication of poor power is the power LED flashing from red and green Technical Assistance If you have any prob...

Page 69: ...25A 255A Note 2 Does not include 2500 Note 4 Does not include IC 100H IC 2700H Pre wired DSP to TNC Cables TNC MFJ Part Price All MFJ TNCs PK 900 PK 96 PK 12 PacCom other TNC 2 compatibles MFJ 5100 14 95 PK 232 MFJ 5100X 14 95 KAM HF5 KAM VHF5 KPC35 KPC96125 MFJ 5100YH6 14 95 MFJ 5100YV7 14 95 PK 88 MFJ 5100Z 14 95 Note 5 YH for KAM HF port YV for KAM VHF port Other Kantronics use YV models Note 6...

Page 70: ..._____ Memory 4 Mode ___________ Operation Conditions Radio Frequency ________________________________ ________________________________ CF BW ________________________ LR HR ________________________ Memory 5 Mode ___________ Operation Conditions Radio Frequency ________________________________ ________________________________ CF BW ________________________ LR HR ________________________ Memory 6 Mod...

Page 71: ..._____ Memory 4 Mode ___________ Operation Conditions Radio Frequency ________________________________ ________________________________ CF BW ________________________ LR HR ________________________ Memory 5 Mode ___________ Operation Conditions Radio Frequency ________________________________ ________________________________ CF BW ________________________ LR HR ________________________ Memory 6 Mod...

Page 72: ..._____ Memory 4 Mode ___________ Operation Conditions Radio Frequency ________________________________ ________________________________ CF BW ________________________ LR HR ________________________ Memory 5 Mode ___________ Operation Conditions Radio Frequency ________________________________ ________________________________ CF BW ________________________ LR HR ________________________ Memory 6 Mod...

Page 73: ...MFJ 784B Instruction Manual Appendix A 9 NOTES ...

Page 74: ...MFJ 784B Instruction Manual Appendix A 10 NOTES ...

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