Page 1 JUMA TRX2 Operation Manual (Firmware Version 5.00a - 28 November 2018) Adrian Ryan - 5B4AIY...
Page 3: Table Of Contents
Table Of Contents Control Description............1 PWR..
Page 4 JUMA TRX2........
Page 5 JUMA Frequency Step Accuracy........
Page 6 Equalising the TRX-2 Output Power........
Page 7 Annex I..............77 Juma TRX-2 TRX-Manager Command Protocol........77 QUERY COMMANDS.
Page 8 Juma Voice Memory Option........
Page 9 VFO Operating Modes & Memory Lock......... 97 A/B–Split Mode.
Page 11: Control Description
JUMA TRX-2 Operating Manual 5B4AIY Firmware Version 5.00a The TRX-2 is an all-band QRP transceiver utilising a direct digital synthesiser and employing quadrature phase-shift detection in a direct-conversion arrangement for both transmission and reception, and capable of USB/LSB and CW modes of operation.
Page 12: Cw Speed
During normal operation, a brief press of the power button will toggle locking the active VFO frequency. When the active VFO frequency is locked, a symbol will be displayed between the VFO and the tuning rate designators. This lock is selective, and can be applied to any VFO or VFO memory.
Page 13: Display/Config
: Microphone/Line input Ring : PTT switch Screen : Ground/Shield The PTT switch requires a dry contact closure to ground, or an open-collector connection capable of sinking 0.5mA from +5V. The microphone is normally expected to be an electret, and there is a bias voltage of +5V via a source resistance of 5.7K.
Page 14: Mode Selection
Mode Selection The primary function is that of selecting the operating mode. A brief push will select in turn or the function. If the button is pressed when displaying LSB, USB, CW, CWR, Tune power, SWR, voltage or current, then the display will blink twice to display the mode change, then return to the previous display page.
Page 15: Rit
A brief push of this button will toggle the Receiver Incremental Tune On/Off. When on, the lower right-hand portion of the screen will display the current offset frequency up to a maximum of ±1kHz, controlled by the RIT knob. Note: The offset frequency is displayed to 2 decimal places, prefixed with either a sign (+/ ) or a space.
Page 16: Fast/Vfast
Note: In this version of the firmware, if the current mode is: and split mode is A/B-Split active, then VFO-A will be used as the active VFO, and the frequency of VFO-B will be checked. If the inactive VFO is tuned to a frequency that is not in the same amateur band as the active VFO, and VFO Equalisation is enabled, then the frequency and mode of the active VFO will be copied to the inactive VFO.
Page 17: Vfo/A=B
At this point the transceiver will cycle through the amateur bands from 10m down to 160m, making power measurements, and at the conclusion will calculate the relative powers obtained and the optimum fixed attenuation required to ensure an equalised power output. During the measurement, the actual output power and the frequency used will be displayed.
Page 18: Filter
If the Long Push Button mode has been set to the Press & Hold mode, then continue to hold the button and rotate the VFO knob to select the desired VFO. Toggle the VFO lock with the PWR button. Release the VFO button to complete the action. FILTER This button is primarily used to select the receiver bandwidths, but also has a secondary function of storing user frequencies and returning to the CW mode from CWR, as well as...
Page 19: System Calibration & Setup
System Calibration & Setup It is assumed that the initial adjustments and settings have been made. Note that when selecting the Calibration & Setup menu, VFO-A will be selected, the frequency will be set to 14.019300MHz. This frequency was chosen so that the default 20m frequency of the Elecraft XG3 signal generator can be used for the S-Meter calibration.
Page 20: Supply Voltage Calibration Factor
±0.1ppm, then measure the output frequency of the oscillator using the 10 second timebase, making at least 10 measurements. Average the results to 2 decimal places and multiply by 6. Round this figure to 1Hz, and this is the frequency to which the reference oscillator should be adjusted.
Page 21: Forward Power Calibration Factor
With this version of the firmware, when displaying the ammeter calibration page, the mode is set to USB, and the microphone audio input is set to LINE thus ensuring essentially no drive. As a final point, rotate the SSB modulation level potentiometer fully anti-clockwise (10-turn potentiometer.) Connect a suitable accurate external ammeter in series with the transceiver, and ensure that the power supply is set to 13.8V.
Page 22: S-Meter Calibration Factor
whilst making this adjustment. When using the CW mode the full 10W will be available. Note: The sense of the CARR potentiometer is reversed! A clockwise rotation of the adjustment screw reduces the carrier level, an anti-clockwise rotation increases it. Try to make this adjustment as quickly as possible to avoid excessive heat dissipation of the power amplifier transistors.
Page 23: High Swr Trip Limit
High SWR Trip Limit Default: 3.00 If the SWR exceeds the trip limit, an alarm will be generated and displayed on the main screen. The limit can be set from 1.00 – 10.00. Although a setting of 1.00 may seem odd, it allows you to check that the alarm is working.
Page 24: Overvoltage Trip
cancel the alarm. Switch off and reselect the System Calibration menu and reset the trip to a suitable value. Note: The current measured is that of the final amplifier. The internal fuse is rated at 3.5A, and since the transceiver’s logic and display sections can consume up to 450mA, the normal trip limit of 2.5A represents a conservative safety margin.
Page 25: Long Push Button Mode (Second Function)
Long Push Button Mode (Second Function) Default: Push & Hold There are three buttons that can have their second function (long push operation) configured. The buttons are: RIT – Rapid Band Switch; VFO – VFO Select/Lock in the VFO Multi-Memory mode, Toggle VFO Lock in Split mode; MODE –...
Page 26: Individual Amateur Band Attenuation Adjustment
If the Splash Screen is enabled, there will be a brief message displaying the current setting when powering up. Splash Screen Default: Juma The splash screen is the screen displayed whilst the transceiver is initialising. The default value –...
Page 27: Agc Speed
is displayed. Release the button, and the last selected user configuration page will be displayed. To exit from the User Configuration menu, press and hold the DISPLAY/CONFIG button until you hear a long beep. You will be prompted. Briefly press either the PWR button to exit without making any changes, or the MODE button to exit and save the new settings.
Page 28: Speech Processor
Speech Processor Default: OFF The transceiver is equipped with a simple speech processor which uses a soft-clipping method to achieve a higher peak to average ratio for speech to increase the average talk- power. However, this also leads to a certain amount of distortion, and thus this setting has to be carefully related to the transmit SSB gain setting, R26.
Page 29: Cw Keyer Speed Adjust
There are two squelch modes. Mode A operates as before, if the backlighting timer feature is used, and it has timed-out, then a signal above the squelch threshold will not turn the backlighting on. Mode B however will turn the backlighting on if a signal is above the threshold, and the backlighting will remain on until the signal level has once again fallen below the threshold, re-enabling the backlighting timer function.
Page 30: Lcd Contrast
For a list of commands that are emulated, please see Annex D. JUMA TRX2 This mode is used to enable serial communication with the companion JUMA PA100D 100W linear amplifier. It can also be used with the TRX-Manager CAT software produced by Laurent Labourie, F6DEX.
Page 31: Vfo Memory Operation
VFO Memory Operation Default: A/B + Split This setting governs how the various VFOs and memories are used and organised. The settings range from A/B–Split mode, giving 2 active VFOs, VFO-A and VFO-B, and 24 memories, MemC through MemZ, to a minimum of 3 active VFOs, VFO-A through VFO-C and 23 memories, MemD through MemZ, or a maximum of 26 active VFOs, VFO-A through VFO-Z, and zero memories.
Page 32: S-Meter
Note: This configuration page is only displayed if the mode is selected. It is A/B-Split skipped if the multi-memory mode is selected. S-Meter Default: Graphic This feature allows you to select either a graphical S-Meter (Original) or a numeric S-Meter. The gain characteristics of a correctly adjusted and calibrated receiver are almost exactly logarithmic over the dynamic range of the receiver, which lends itself to an easy implementation of either display with reasonable accuracy.
Page 33: Frequency Display Selection
Band-Switch Feature. It does not affect tuning when using the tuning knob. Even with auto sideband selected, you may still choose any operating mode on any band. Frequency Display Selection Default: Fixed B The original frequency display was limited to 10Hz resolution, and used two decimal points, between the MHz and 100kHz digits and between the kHz and 100Hz digits.
Page 34: Rapid Band-Switch
Rapid Band-Switch Default: Default This setting governs how the Rapid Band-Switch feature operates. Default In this mode, the frequency used will be fixed at approximately the band’s centre, and the mode will be LSB below 10MHz, and USB above. BAND FREQUENCY MHz 160 metres 1.900...
Page 35: Mode-B
Mode-B In this mode, normally the current frequency and mode is automatically saved when changing bands. See however the temporary Mode-C. Note: In this mode, the changes are not automatically saved to the EEPROM. If the power down mode is set to , then these changes will be lost, if the mode is set to Immediate , then you will be prompted to save the state when you power down.
Page 36: Vfo Adjust
Using the VFO tuning knob, adjust the attenuation to the desired value, 3dB is recommended. VFO Adjust Default: Off With the ability to adjust the VFO frequency in several steps, from increments of 1Hz to 1kHz, the need arose to be able to round the frequency to the nearest decade increment. This is particularly important if you use either the default frequency display or frequency Display B, as these only show to 10Hz.
Page 37: Power Meter Display
If you choose the setting, then the transceiver will simply immediately power Immediate down without saving anything. Since both the Setup and User Configuration menus now have a prompted exit, there is little need for an automatic save to be made. Note: If the mode is selected, the current VFO, frequency, mode, RIT On/Off Immediate...
Page 38: Start-Up Page
Be aware that the maximum rated output of this transceiver is 10W/+40.0dBm – do not exceed this otherwise you risk blowing fuses and/or damaging the output transistors. The graphic power meter is fixed scaled at 10W full-scale, thus allowing you to easily determine the current output power in relation to the maximum setting.
Page 39: Graphic Limits Display
The MODE, FILTER and VFO buttons will cause their respective status to be sent. Note that The status will be described in CW in the format: Mode Filter VFO Frequency A typical message might be: U N VA F14234 The Mode word will be: L, U, CN, CR, or TN The Filter word will be: N, W The VFO word will be: VA, VB, SA (Split Mode), or VA through VZ for the multi-memory mode.
Page 40: Swr
The bar-graph displays the instantaneous SWR as a proportion of the current trip. For example, if the current trip is 3:1, and the measured value is 2:1, then the bar-graph indicates half full-scale, the zero setting being a SWR of 1:1. In addition, the alarm system has been slightly modified.
Page 41 Version 1.07h and later slightly modified the way that the New display operates. After careful consideration, I decided that displaying frequencies below 1MHz with leading zeros was simply ugly. The display now shows a decimal point at the MHz position for frequencies above 999.999kHz, and simply moves the decimal point to the kHz position and fills the leading spaces with blanks for frequencies from 1kHz to 999.999kHz.
Page 42 Pressing the PTT switch or keying the transmitter forces the transceiver to send the current band data to the PA-100D when using the TRX-2 protocol. A new CW mode, CWR has been implemented, and the existing CW mode greatly modified.
Page 43 The Yaesu and Kenwood CAT command sets have been extended with a custom Extended Display feature. The Juma TRX-2 mode has also been extended with this. Most CAT program allow the user to define a custom command sequence, and this can be used to invoke this additional feature.
Page 44 Added Fast Menu Page Select feature to System Calibration Menu. Modified the Rapid Band-Switch feature to display the current mode setting. Saved current display page whenever the User Configurations are saved. Added choice to start-up display page. Moved the Power-Off Mode to be next to the Display Page option in the Configuration Memory as they are now logically connected, and modified the operation of both options.
Page 45 Improved the prompt for the User Configuration menu. Complete re-design and simplification of the frequency display logic. Added dBm output power display option. Enabled Auto-Equalise from the front panel as well as remotely via a terminal. Revised the ‘sense’ of the CW/CWR tuning. In this version, on all bands, with the CW (normal) mode selected a clockwise rotation of the VFO knob increases the received pitch.
Page 46 Revised Rapid Band-Switch operation. User selectable VFO frequency/mode equalisation in the A/B+Split VFO mode. Added contact bounce suppression to CW Straight mode to deal with a genuine Vibroplex™ key. Altered the filter selection and changed the adjustment settings to optimise the performance with the new FL-2 roofing filter.
Page 47: Annex A
Annex A JUMA Frequency Step Accuracy The original Juma TRX2 firmware revision 1.06 had an inherent frequency resolution of 10Hz. Meaning that the actual frequency to which the transceiver is tuned is within ±5Hz of the displayed frequency, if we neglect the reference oscillator errors. Or is it? If we carefully examine the frequency display, we can observe some interesting quirks.
Page 48 within ±5Hz of the displayed frequency, which is more than adequate – even on the lowest amateur band this represents a tuning accuracy of ±2.5ppm, and even better at the higher frequencies. But, I’m a perfectionist, you might even say obsessive, and it occurred to me that the synthesiser could do better.
Page 49: Annex B
Annex B Reference Oscillator Calibration The accuracy of the reference oscillator determines the overall frequency accuracy of the transceiver. The master oscillator is the 30MHz package oscillator on the DDS board, and its output is used both to clock the microprocessor, as well as provide the reference for the DDS synthesiser chip.
Page 50: Method 2 - Indirect Calibration
This is a fairly stringent specification to meet, and the average frequency counter from, for example, eBay is unlikely to meet this. It really requires access to a laboratory grade counter whose calibration is current. If you have access to such a counter, then carefully measure the output frequency to an accuracy of 1Hz using the 10 second time-base setting and collect at least 10 measurements.
Page 51 Averaging these results gives a beat frequency of: 949.40Hz Error: 949.40 1000 = 50.60Hz Crystal Oscillator Frequency = 30,000,000 + ((30,000,000 / 5,000,000) * 50.60) = 30,000,000 303.60 Hz = 29,999,696.40Hz Reference Oscillator Frequency = 29,999,696.40 * 6 = 179,998,178Hz In this case, the crystal oscillator was low by about 10ppm.
Page 52: Method 3 - Direct Carrier Calibration
Error: 1250.00 1000 = +250.00Hz Crystal Oscillator Frequency = 30,000,000 + ((30,000,000 / 10,000,000) * +250.00) = 30,000,000 + 750.00 Hz = 30,000,750.00Hz Reference Oscillator Frequency = 30,000,750.00 * 6 = 180,004,500Hz In this case, the crystal oscillator was high by about 25ppm. Method 3 –...
Page 53 In all probability the displayed frequency is somewhat offset from the precise carrier frequency, and by using the following calculation it is possible to correct this offset. Let the standard frequency be Let the displayed frequency be disp Let the oscillator frequency be Let the reference frequency be Then: = 30,000,000 + ( ( F...
Page 55: Annex C
: 00 00 00 00 03 Response : 14 54 32 10 xx Where xx is the mode byte, with the following meanings: TUNE (PKT mode for FT-857) There are a number of other values, but they are not applicable to the Juma TRX-2...
Page 56: Read Rx Status
Where xx is the data byte, and the bits have the following meanings: Squelch Status 0 = OFF, Signal present, 1 = ON, Receiver squelched CTCSS/DCS code. For Juma = 0 Discriminator Centering, for SSB/CW = 0 Dummy Data 0...
Page 57: Set Operating Frequency
TUNE (PKT mode in FT-857) Set Operating Frequency Command : aa bb cc dd 01 Assume the frequency is: 14.23456MHz, aa = 01, bb = 42, cc = 34, dd = 56 PTT ON (Transmit) Command : 00 00 00 00 08 PTT OFF (Receive) Command : 00 00 00 00 88...
Page 59: Annex D
Annex D Kenwood TS-480/590 CAT Command Emulation If the RS-232 serial port mode is set to Kenwood CAT, then the transceiver will respond to the following command sequences: Read/Set VFO-A Frequency : FA Read/Set VFO-B Frequency : FB Select/Read Receiver VFO : FR Select/Read Fine Tune : FS...
Page 60: Set Vfo-B Frequency
Set VFO-B Frequency Transmitted From PC (Assume the frequency is: 14.195MHz) FB00014195000; Read VFO-B Frequency Transmitted from PC Response from TS-480 (Assume the frequency is: 14.195MHz) FB00014195000; Select Receiver VFO Transmitted from PC FR0; Select VFO-A FR1; Select VFO-B Read Receiver VFO Transmitted from PC Response from TS-480 FR0;...
Page 61: Read Transceiver Id Number
Read Transceiver ID number Transmitted from PC Response from TS-480 ID020; Read Transceiver Status Transmitted from PC Response from TS-480 IFp1p1p1p1p1p1p1p1p1p1p1-p2p2p2p2p2-p3p3p3p3p3-p4-p5-p6-p7p7-p8-p9-p10-p11-p12-p13-p14p14-p15; Note: For clarity a dash symbol - has been inserted between the parameter blocks, this is not present in the return string. : 11 digits of receiver frequency to 1Hz, example: 14.234567MHz = 00014234567 : 5 spaces : RIT frequency ±nnnn Hz...
Page 62: Set Mode
MD2; USB MD3; CW MD7; CWR MD8; TUNE Read Current Mode Transmitted from PC Response from TS-480 (Other modes are possible, but not applicable to a TRX-2) MD1; LSB MD2; USB MD3; CW MD7; CWR MD8; TUNE Set Noise Blanker Transmitted from PC NB0;...
Page 63: Read Rit Status
00: 10, 01: 50, 02: 100, 03: 200, 04: 300, 05: 400, 06: 500, 07: 600, 08: 700, 09: 800, 10: 900, 11: 1000, all frequencies in Hz. The Juma emulation ignores this command. Read Low Frequency DSP Settings...
Page 64: Read S-Meter Status
where nn has the following meanings: 00: 500, 01: 700, 02: 900, 03: 1100, 04: 1300, 05: 1500, 06: 1700, 07: 1900, 08: 2100, 09: 2300, 10: 2500, 11: 2700, all frequencies in Hz. Read S-Meter Status Transmitted from PC SM0;...
Page 65: Read Extended Display Status
Read Extended Display Status Transmitted from PC Response from Juma TRX-2 XDn; Where n has the following meanings: Normal Display RF O/P Power Display SWR Display Supply Voltage Amplifier Drain Current Set Extended Display Transmitted from PC XDn; Where n has the following meanings:...
Page 67: Annex E
When the serial port mode is set to the Test Mode, the user can investigate the current settings of the transceiver via a terminal program. Set the terminal program to the same settings as the TRX-2, typically, 9600 Baud, 8 data bits, 1 stop bit, no parity.
Page 68 : 2756 = 14.80V Under-Voltage Trip : 2049 = 11.00V Long Button Mode : Press&Hold Band Limits : IARU Region 1 Splash Screen : Juma TRX2 User Settings ----------------------------------- AGC Speed : Slow Filter BW Narrow : 1000 Hz Filter BW Wide...
Page 69 : 2756 = 14.80V Under-Voltage Trip : 2049 = 11.00V Long Button Mode : Latched Band Limits : IARU Region 1 Splash Screen : Juma+Region User Settings ----------------------------------- AGC Speed : Fast Filter BW Narrow : 1000 Hz Filter BW Wide...
Page 70 Voice Memory : Installed ----------------------------------- Enter the letter ‘B’, and you can exercise the alarm sub-system thus: Set Alarm Flag Enter 0, 1, 2, 3, 4, 5, or 6 ... 1 - Over-Current Alarm Set Alarm Flag Enter 0, 1, 2, 3, 4, 5, or 6 ... 2 - High SWR Alarm Set Alarm Flag Enter 0, 1, 2, 3, 4, 5, or 6 ...
Page 71 Entering the letter ‘R’ will dump the contents of the User Frequency Memory thus: VFO Memory Settings --------------------------- VFO-A: 14.200000 MHz VFO-B: 14.200000 MHz Mem-C: 6.607017 MHz Mem-D: 3.600000 MHz Mem-E: 7.100000 MHz Mem-F: 10.125000 MHz Mem-G: 14.100000 MHz Mem-H: 18.118000 MHz Mem-I: 21.300000 MHz Mem-J: 24.940000 MHz Mem-K: 28.850000 MHz...
Page 72: Auto-Equalise
These attenuator settings are the factory defaults; to equalise the RF output power across the amateur bands, the attenuation factors can be changed. Please refer to Annex H for further details of the manual method, or use the Auto-Equalise command. Entering the letter ‘G’...
Page 73 Equalising... Band: 10m Average Power: 3.3W : +35.2dBm Band: 12m Average Power: 3.9W : +35.9dBm Band: 15m Average Power: 3.7W : +35.7dBm Band: 17m Average Power: 3.4W : +35.3dBm Band: 20m Average Power: 4.4W : +36.5dBm Band: 30m Average Power: 3.6W : +35.5dBm Band: 40m Average Power:...
Page 74: Spi Data Bus Display
SPI Data Bus Display The ‘J’ command can be used to display the current data being sent via the SPI data bus to configure the transceiver. The bit meanings are: Attenuation D13, D12, D11 Spare Bits (Always zero) D10, D9, D8 RF Filter Select Dual-Band O/P Filter Select (3.5MHz/7MHz) –...
Page 75: (Increment) (Decrement) Attenuator Settings
+(Increment) (Decrement) Attenuator Settings These keys allow you to adjust the preset attenuator settings for the currently selected band. Note: These changes are not automatically saved. If you wish to preserve the changes, then ensure that you save the transceiver’s settings when you power down. RS-232 Echo Test Although not part of the serial test suite commands, there is a low-level RS-232 echo test available that can help identify serial port problems.
Page 77: Annex F
Annex F Improved Accuracy Measurement Sub-System The original measurement sub-system, whilst sufficient for general purpose indications of the voltage, current and power output of the transceiver, did not completely capitalise on the inherent accuracy available from a 12-bit A-D convertor. The designers chose to optimise the speed of the main processing loop in the software, and used calibration constants and factors that lent themselves to easy integer manipulation, avoiding the use of floating point mathematics.
Page 78 Thus, in principle, it should be possible to adjust the calibration of the voltage measurement system to have an overall accuracy of about ±5.25mV In the original firmware the actual calculation was: = ( ADC * Calibration Factor ) / 256 display If we insert some typical values, then the ADC value for 13.8V will be around 2629, and the default calibration value is 135, and thus:...
Page 79 Equally, the highest output voltage will occur when R28 is at its highest tolerance limit and R27 at its lowest. In this case, the nominal 13.8V input voltage will be scaled down to: 13.8 * 10100 / ( 10100 + 32670 ) = 13.8 * 10100 / 42770 = 3.25883V The tolerance of the voltage regulator’s output is ±0.25V, and thus the lowest count from the...
Page 80: Current Measurement
Current Measurement The ammeter in the TRX2 only measures the drain current of the output amplifier, not the total current consumed by the transceiver. Nevertheless, in order to accurately set the bias currents for both the driver and power amplifier stages, it is essential that the current measurements are performed to as high an accuracy as possible.
Page 81 The forward power scaling factor is approximately 2.05V/10W, which results in a convertor output of: 2.05 / 5 * 4,096 = 1,679 This has to be squared: 2,819,041 and multiplied by the calibration factor to read 10W, and the factor required is therefore: 3,547 Thus, the actual value of the output is: = 1,679 * 1,679 * 3,547...
Page 83: Annex G
Annex G The TRX2 Alarm System Version 1.07k of the firmware introduced an additional feature to the transceiver, an alarm system to provide the user with a critical warning of potentially damaging factors. The system can provide a warning for high SWR, power amplifier over-current, and high and low input voltages.
Page 84: Over-Voltage
achieve a match when the high SWR might only persist for a short time. It is left to your judgement as to what level to set the alarm, but 2.5A is suggested. The current is averaged over 64 samples, representing a sampling interval of about 300mSec. This will ensure that transient peaks are ignored, but a steady-state over-current will be registered and will trip the alarm.
Page 85: Annex H
Annex H Equalising the TRX-2 Output Power The Juma TRX-2 has a somewhat ‘hidden’ feature whereby you can set the output power of the transmitter on all bands to be essentially the same despite minor variations in insertion loss of filters, and the varying gain of the output amplifier with frequency.
Page 86 Note that the second row shows an alternative setting using slightly lower overall gain, but achieving the same result. As you select the various bands, the attenuator setting will be preserved and saved to the EEPROM when the transceiver is powered down, thus you only really need to “calibrate”...
Page 87: Query Commands
Annex I Juma TRX-2 TRX-Manager Command Protocol This document describes the command formats and responses to be used when using a personal computer to remotely control the transceiver’s operation using the TRX-Manager application written by Laurent, F6DEX. The commands take one of two forms, the first is a query, whereby the transceiver will send a formatted response indicating the particular state of the transceiver.
Page 88: Lsb
Band Query n = 0 – 9 0 = Out Of Band (Frequency < 1MHz) 1 = 160m 2 = 80m 3 = 40m 4 = 30m 5 = 20m 6 = 17m 7 = 15m 8 = 12m 9 = 10m Speech n = 0 –...
Page 89 =Rn:+/-nnnn n = 0 – 1 0 = Off 1 = On :+/-nnnn – RIT offset frequency Meter =Snn n = 0 – 9 00 – 48 Scaled power in transmit, S-meter in receive. TX/RX n = 0 – 1 0 = Receive 1 = Transmit VFO In Use...
Page 90 Select Amateur n = 1 – 9 Band 1 = 160m 2 = 80m 3 = 40m 4 = 30m 5 = 20m 6 = 17m 7 = 15m 8 = 12m 9 = 10m See Note-2 Set Speech n = 0 – 1 Processor 0 = Off 1 = On...
Page 91: Set Current Filter Bandwidth
Set Mode Of =MAn MA – VFO-A Specified VFO =MBn MB – VFO-B Power OFF n = 0 – 1 See Note-5 Set Tuning Rate n = 0 – 2 0 = 1Hz 1 = 10Hz (Default) 2 = 100Hz Set RIT On/Off n = 0 –...
Page 92: Auto-Update
This function can only be enabled remotely, it is normally disabled, and there are no user settings that can enable it locally. In this way, if the TRX-2 is connected directly to its companion linear amplifier, the PA-100D, there is no adverse effect upon the normal operation.
Page 93: Vfo
Sending the command: =I1, =I2, or =I3 will always return the current complete status of the transceiver. Subsequent loops will cause the function to examine each parameter, and if a change is detected an appropriate status message will be sent to the terminal program. These status messages are the same as the responses to specific polled query commands.
Page 94: Selected Vfo
Selected VFO n = 0 – 2 0 = VFO-A (Simplex) 1 = VFO-B (Simplex) 2 = Split, A = Rx, B = Tx Tuning Rate n = 0 – 2 & 4 0 = 1Hz 1 = 10Hz 2 = 100Hz 4 = 10kHz RIT On/Off =Rn:+/-nnnn...
Page 95: Sample Auto-Update Initialisation
Simply connect the TRX-2 transmit data to the receive data line of both the PC and the PA-100D. Connect the TRX-2 receive data line to the transmit data line of the PC. Leave the PA-100D transmit data line unconnected, and set its Polling Time to zero (Off).
Page 97: Annex J
9,600 baud. This port can only be used as the control port if both a Voice Memory module is present, and UART1 is not configured as the control port. You can use a terminal program, or the Windows Voice Memory control program available from the Juma website which essentially replicates the external keyboard’s functionality.
Page 98: P Playback
Note-6: The Erase command is only available from a serial terminal program, neither the Juma Windows voice memory control program nor the external keyboard are configured to send this command. This does not affect recordings, since a new recording will over-write an existing one, it is not necessary to erase first.
Page 99 During recording operations, the time will be displayed, decrementing from the designated memory’s assigned time. During replay operations, the time will be displayed, incrementing until either the end-of-message is reached or the end of memory, whichever occurs first. As the clock for the ISD-17240 voice memory chip is derived from a resistor, it is not synchronised in any way with the main microprocessor clock.
Page 101: Annex K
Annex K CW Mode Interrupted Continuous Wave telegraphy, ICW, or simply CW, was the earliest form of radio communications. It merely required the operator to interrupt or key the radio frequency output of the transmitter, and used Morse as the means of encoding the signal. Even today, despite most licensing authorities having dropped the requirement for the applicant to be able to send and receive Morse code, the simplicity and popularity of this mode of communication remains.
Page 102 CW the local oscillator is detuned by 1kHz, then again both station’s transmitted carriers are at the same frequency. The original Juma firmware utilised the first method, and the transmit carrier was always lower in frequency than the receive carrier by the amount of the CW offset as set in the User Configuration menu.
Page 103 Note: When calibrating the transceiver’s master oscillator it is vital that you use either USB or LSB as the receiver mode to avoid this internal offset, unless using the CW/CWR method. In this latter case, the offset is taken into account when switching between CW and CWR, and the actual value of the offset is unimportant.
Page 105: Annex L
Annex L CW Keyer Operating Modes Dot Priority With this mode selected, pressing the dash paddle sends continuous dashes, releasing the dash paddle and pressing the dot paddle sends continuous dots. If both paddles are squeezed, then continuous dots are sent. Note that if you hold the dash paddle, and then squeeze the dot paddle you can inject dots, and dashes will resume when you release the dot paddle.
Page 106: Straight
Straight With this mode selected, the keyer simply follows the dot paddle input. The dash paddle contact is ignored. Release Delay Time This is the time taken for the transceiver to switch back to the receive state. When using an Iambic or the Vibroplex mode, the time is fixed at 7 x Dot Time which equates to a word space time.
Page 107: Annex M
Annex M VFO Operating Modes & Memory Lock The transceiver’s VFOs can operate in either the A/B+Split or Multi-VFO modes. The mode is selected via configuration page 16 in the User Configuration menu. A/B–Split Mode When in this mode, there are two active VFOs, VFO-A and VFO-B, and 24 memories. If the VFO/A=B button is momentarily pressed, it will cycle through the VFO-A, VFO-B, Split, and back to VFO-A selections.
Page 108: Vfo Multi-Memory Mode
It was envisioned that some users might wish to save favourite frequencies, for example, those of short-wave broadcast stations, and to lock the memory to ensure that the frequency was not changed. The VFO Memory Copy function would then be used to retrieve these favourite frequencies.
Page 109 changes are saved. Otherwise, if the power-down mode is set to the PROMPTED mode, the user will be prompted to save any changes. If an exit is made without saving the changes they will be lost, and at the next power on cycle the last configuration will be restored.
Page 111: Annex N
Annex N CW Practice Mode The CW Practice feature allows the transceiver to be used for practising Morse code reception. To use this mode, from the power-off state, press and hold the FILTER button, and briefly press and release the PWR button to turn the transceiver on. Continue holding the FILTER button whilst the transceiver boots, until the message: CW Practice Mode is displayed.
Page 112 The standard spacing is 3 dot-intervals. Use the VFO knob to alter the setting. If you are just starting, then set this interval to something longer, for example, 5 dot-intervals to give yourself additional time to recognise the character. The maximum setting is 15 dot-intervals. Briefly press the FILTER button to start the exercise.
Page 113: Quick Reference Guide
QUICK REFERENCE GUIDE BUTTON SHORT PUSH LONG PUSH LONG PUSH (Latched/Press & Hold) Power ON Power OFF (Normal) Select band attenuator setting with VFO knob. (Requires Tune mode to be Cancel RS-232 Test (With DISP) Emergency Power OFF (From alarm selected, PTT switch closed, and PWR mode) button to be briefly pressed to latch...
Page 114: Usa Extra & General Class Frequency Allocations
USA Extra & General Class Frequency Allocations US Extra Class Frequency Privileges 1.800 – 2.000 3.500 – 4.000 7.000 – 7.300 10.100 – 10.150 14.000 – 14.350 18.068 – 18.168 21.000 – 21.450 24.890 – 24.990 28.000 – 29.700 US General Class Frequency Privileges 1.800 –...
Page 115: System Calibration Settings
Over Voltage Trip (Adjust) 14.50 V Over Current Trip Over Current Trip (Adjust) 2.50 A Under Voltage Trip Under Voltage Trip (Adjust) 11.00 V Long Push Button Mode Push & Hold Band Limits IARU Region 1 Splash Screen Display JUMA TRX2...
Page 116: User Configuration Settings
USER CONFIGURATION SETTINGS DATA VALUE DEFAULT AGC Speed Slow Filter Bandwidth – Narrow 1,000 Hz Filter Bandwidth – Wide 2,550 Hz Filter Bandwidth – Transmit 2,678 Hz Audio I/P Speech Processor Keyer Mode Iambic B CW Release Delay 500 mS CW Pitch 700 Hz CW Pot Mode...
Page 117: User Mode Rapid Band Select Frequencies
USER MODE RAPID BAND SELECT FREQUENCIES BAND USER FREQUENCY DEFAULT 160 m 1,900 kHz 80 m 3,600 kHz 40 m 7,100 kHz 30 m 10,125 kHz 20 m 14,100 kHz 17 m 18,118 kHz 15 m 21,300 kHz 12 m 24,940 kHz 10 m 28,850 kHz...
Page 118: Auto Equalise Attenuator Settings
AUTO EQUALISE ATTENUATOR SETTINGS BAND DEFAULT USER 160 m 1 dB 80 m 1 dB 40 m 1 dB 30 m 1 dB 20 m 1 dB 17 m 1 dB 15 m 1 dB 12 m 1 dB 10 m 1 dB...

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