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AR5000 Bulletin Page

AR5000 brief production history

The AR5000 first appeared in 1996, the serial numbers were 5xxxx (six digit numbers starting

with the number five). In the first few months of production, some beefing up of the internal

power PCB took place, a trimmer was added to the SSB insertion oscillator (PCB) and some

noise reducing changes added (DDS decoupling, change of RS232 device).

A revision to operation (firmware) appeared after about one year, the serial numbers changed

to 07xxxx (six digit numbers starting zero seven with four digits following).

A board change occurred around serial number 070661 when the AR5000+3 additions

appeared (Synchronous AM, noise blanker, AFC). If the serial number is lower than 070661

we cannot retrospectively add the +3 options

Around 070661 the EEPROM switching

was revised so that an alternate bank of memories

and search banks could be switched (doubling the memory capability).

Minor firmware revisions have taken place since, mainly to boost the durability of EEPROM

when under computer control (commercial operators).

The AR5000C is a frequency coherent version of the AR5000, designed for commercial

operators.

Current serial numbers (February 2003) are around 077xxx.

Retrospective and free updates are NOT available. The AR5000 has been designed &

manufactured by AOR Japan who are officially responsible for international distribution and

support... comment presented here may not reflect their official status or views, AOR UK

LTD.

AR5000 1kHz filter modification

We have had several enquiries regarding the fitting of a 1kHz data filter to the AR5000; in

particular the CFJ455K8 which we originally sourced for our AR7030 HF receiver. The main

problem in fitting this filter to the AR5000 is the physical incompatibility; we have found

however that by turning the filter upside down you can attach short leads to it and connect it

in the MF1 Collins 500Hz filter position on the AR5000 IF board without any great difficulty.

The diagram below shows the CFJ455K8 filter connection details. All three earth connections

should be connected together using tinned copper wire and then soldered to the original

Collins earth connection using thick tinned copper wire to achieve a good physical stability on

the board. Short lengths of wire can now be used to make the in/out connections between the

filter and PCB. If you require a more permanent fixing of the filter to the board we suggest

Summary of content (24 pages)

PAGE 1
AR5000 Bulletin Page AR5000 brief production history The AR5000 first appeared in 1996, the serial numbers were 5xxxx (six digit numbers starting with the number five). In the first few months of production, some beefing up of the internal power PCB took place, a trimmer was added to the SSB insertion oscillator (PCB) and some noise reducing changes added (DDS decoupling, change of RS232 device).
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double sided tape to hold the filter in an upside down position before making the soldered connections. Careful examination of the PCB around the filter connections will show that there are two 33pF SMD capacitors connected between the filter in/out and earth. Ideally these could be removed to give a flatter frequency response along with changing R173 to 1k8. In practice however you will probably not notice any change and we recommend that they are left as standard.
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The detector output can be taken from pin 9, IC8. This is a surface mount IC located on the underside of the board (roughly under the 10.245Mhz crystal). IC8 is labelled as MC3372M. The output can be taken by directly soldering a wire to the output pin or from the capacitor it feeds (C88 - located directly next to pin 9). Care must obviously be taken when carrying out any work of this type.
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Overall noise figure: AM S/N is as follows at 60% and 70% modulation with 3 kHz and 6 kHz filters Freq Filter 60% 70% 129.8 MHz 3kHz 48dB 49dB 129.8 MHz 6kHz 49dB 50dB 880.8 MHz 3kHz 33dB 33.5dB 880.8 MHz 6kHz 46dB 47dB Also refer to attached local oscillator noise measurement. IF / image rejection, Image rejection (1st image): 250 kHz 81dB 700 kHz 81dB 1.450 MHz 85dB 3.000 MHz 85dB 7.000 MHz 87dB 15.80 MHz 88dB 30.80 MHz 89dB 52.80 MHz 107dB 120.8 MHz 119dB 199.8 MHz 95dB 320.
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Test frequency (wanted) Unwanted frequencies Product 25.800 MHz 25.925 & 26.050 MHz -8dBm 129.800 MHz 129.925 & 130.050 MHz -14dBm 320.800 MHz 320.925 & 321.050 MHz -12dBm 470.800 MHz 470.925 & 471.050 -10dBm 850.800 MHz 850.925 & 851.050 -10dBm Cross modulation: Wanted frequency 129.800 MHz, 60% AM with 15 kHz bandwidth -93dBm S/N 21.5dB Interfering signal 129.900 MHz, 30% mod -23dBm S/N 18dB 60dB -27dBm S/N 20dB 56dB Wanted frequency 129.
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ii. Press and hold the "CLR" key while switching on the receiver once again, keep hold of the "CLR" key. iii. The clock will be displayed, wait for the default frequency/text display to appear then release the "CLR" key. The defaults are: Frequency 128.900MHz Receiver Mode AM Tuning Step 25kHz IFBW 6.0kHz Attenuator 00dB AR5000 'S'Meter Response (HEX) The following table is compiled using a standard AR5000 in NFM mode with the 15KHz filter fitted at 171.1MHz.
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AR5000 Frequency stability Measured for a ‘typical’ stock set. Measured at 20 MHz from cold. Room temperature approx. 25 degree Celsius. Time Elapsed Frequency change from start 0 0 Hz 1 minute 3 Hz 2 minutes 4 Hz 3 minutes 6 Hz 4 minutes 8 Hz 5 minutes 9 Hz 10 minutes 16 Hz 20 minutes 25 Hz 30 minutes 30 Hz 40 minute 33 Hz 50 minutes 35 Hz 1 hour 36 Hz 2 hours 37 Hz i.e. Under 2ppm from cold in 1st hour. 0.05ppm in subsequent hour.
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339MHz 891.4MHz 102 107 975Mz 1597.4MHz 95 101 1180MHz 1802.4MHz 98 105 1384MHz 2006.4MHz 101 107 VCO4 340MHz 962.4MHz 100 107 420MHz 1042.4MHz 101 108 499MHz 1121.4MHz 101 108 1385MHz 2007.4MHz 99 106 1399MHz 2021.4MHz 99 106 VC05 500MHz 1122.4MHz 101 108 588MHz 1210.4MHz 100 106 674MHz 1296.4MHz 100 106 129MHz 611.7MHz 107 112 'Close in' phase noise 'typical' measurements are as follows (information provided by AOR Japan): Receiving frequency: Spectrum analyser RBW: 1500.
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IF bandwidth: 15kHz Tuning step size: 5kHz (fine tuned to centre frequency in 100Hz Antenna: Terminated into 50 OHMS SSpur RX Meter ii Frequen Readi No. cy ng SSpur RX Meter ii Frequen Readi No. cy ng 1 0.1600 0 39 681.784 0 2 77 1015.72 47 7 115 2085.35 02 0 2 12.8000 0 40 681.884 0 2 78 1019.16 61 0 116 2093.40 00 0 3 25.6000 3 41 683.112 0 0 79 1023.41 11 0 117 2093.68 32 0 4 38.4000 0 42 687.866 0 3 80 1040.18 83 0 118 2093.96 65 0 5 109.
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3 0 56 20 554.400 0 0 58 785.529 8 4 96 1809.05 02 1 134 21 587.203 0 0 59 799.303 5 0 97 1809.75 02 0 135 22 596.203 0 0 60 799.403 5 0 98 1815.00 02 0 136 23 597.316 0 0 61 805.306 8 0 99 1815.24 02 0 137 24 597.416 8 0 62 808.314 1 6 100 1815.48 02 0 138 25 603.980 0 0 63 815.992 1 0 101 1815.72 02 0 139 26 615.820 0 0 64 816.092 1 0 102 1815.96 02 0 140 27 620.755 0 0 65 822.084 2 0 103 1840.38 25 0 141 28 531.
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Test signals have been generated at 184 MHz FM and the results are presented here while monitoring voltage on the rear AUX connector and using the LM command via the built-in RS232 port and have concentrated on levels between -120 and -100dBm:- Signal level Dev/Filter Dev/Filter Dev/Filter 5/15kHz 24/30kHz 24/110kHz AGC RS232 AGC RS232 AGC RS232 -117dBm 0.32 uV 4.58 V 03 4.58 V 03 4.58 V 03 -116 0.35 4.57 03 4.58 03 4.58 03 -114 0.45 4.56 03 4.58 03 4.58 03 -113 0.50 4.52 03 4.
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It is assumed in this addendum that you understand how to program basic functions. 1. Program three program search banks with the limits 132.000 - 134.500 MHz in AUTO mode (AM 25kHz steps). Link all three search banks to form a single group... so all three are searched together. The operating manual does not specifically deal with step-adjust during program search, so ignore it at this time. Let’s assume you have used banks 1, 2 & 3. 2. Bank 1 is left ‘as is’. 3. Start searching bank 2.
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2. Press [UP] to display the current step-adjust value, such as 5kHz. Select the required stepadjust value by rotating the SUB DIAL or via the keypad (if using the keypad finish the entry with a quick press of [ENT]). 3. To complete the data entry press [ENT] for more than one second. The data will be accepted and display will revert to search with the "STEP-ADJ" legend displayed.
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-90 -72 -72 -80 -64 -69 -70 -57 -66 -60 -49 -61 -50 -41 -56 -40 -33 -51 -30 -25 -46 -20 -16 -39 -10 -11 -35 0 -9 -33 +10 -9 -32 AR5000 IF output relative to input frequency. Checked with set at 145MHz, NFM, AGC off.
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1 spur is present 4.802MHz above carrier frequency at a level of signals present) 67dBm (NFM, no other EARLY AR5000 - SSB frequency display accuracy The very first batch of AR5000 had no specific adjustment for SSB frequency accuracy but relied on the 10.245 MHz crystal feeding the MC3357D. If a frequency error is detected, it is fairly easy to REPLACE the 56pF capacitor to ground using a 39pF capacitor and 20pF trimmer to ground...
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A low level oscillation may be present between 400MHz and 1GHz which may cause a long squelch tail or simply be heard imposed on top of the wanted receive signal. S meter readings may alter in sympathy with the oscillation. This problem has been reported as possible on an early AR5000 but it has only been observed on one set (A version V3.0 set). This can be improved by the addition of a small grounded shield fitted to screen Q10 (FSX52WF) on the RF board.
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AR5000 455kHz I.F. output modification The AR5000 can be easily modified to give a 455KHz I.F. output. This can be done by removing the top cover only. Various points are provided on the IF board which are intended as test points but can easily be soldered to in order to obtain an I.F. output. The I.F. board is the rearmost board once the top cover is removed. Various levels can be obtained depending at which point the signal is taken from.
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However, only FOUR sub carrier (inversion points) are supported, then they are repeated over-and-over... these frequencies are: 3.7kHz 3.5kHz 3.3kHz 3.1kHz These tones are primarily intended for the decoding of Japanese cordless phones but may be used for simple PMR systems such as PMR446 etc.
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3 s 81 steps 2 s 76 steps 1 s 40 steps 0.5 s 20 steps In practice, this produces a noticeable increase in tuning speed with increase in rotation speed up to about 1 rev / second. After that the tuning speed remains the same regardless of how much faster the encoder is rotated. The overall result is a very smooth tuning action while retaining reliable slow speed tuning. There is very little circuit involved between the encoder and the microprocessor, just a couple of resistors and some decoupling.
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PURPLE wire type COLOUR PIN NUMBER 1 RED 2 BROWN 3 GREEN 4 YELLOW 5 ORANGE 6 BLACK 7 PURPLE 8 BLUE SCREEN / GROUND The functions of each pin can be found on page 10 of the AR5000 operating manual. Since writing the above (October 2001), a third type of cable has been supplied. This is almost indistinguishable from the above cable but is more logically wired (nearly like the resistor colour code).
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35k -116 dBm (0.35uV) 30k -112 dBm (0.55uV) 25k -108 dBm (0.9uV) 20k -104 dBm (1.4uV) 15k -101 dBm (2.0uV) 10k -97 dBm (3.2uV) 6k -76 dBm (35uV) Receiver serial No: 070020 AS5000 switch - circuit diagram An optional switch is available for the AR5000, the part number is AS5000. The switch plugs into the rear panel ANT1 N-connector providing three N-sockets and leaves the rear chassis ANT-2 SO239 socket still available.
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converter project by Jason Reilly of Australia (posted to the AR5000 re-mailer in April 1999) - PLUS modifications for the AR5000 receiver It is not possible to PLUS upgrade AR5000 receivers outside of the AOR factory in Japan apart for one or two workshops around the world such as that of AOR UK LTD. If the AR5000 is a late serial number (at least above 70661, preferably 71xxx) it should be possible to add the PLUS features.
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If the tuning is slightly stiff, chances are that it is the bearing mounted slightly off centre. To rectify this, remove the main encoder tuning knob by first sliding off the outer rubber sleeve and then loosen the small hex grub screw (only one is fitted even though there may be holes for two). Loosen the two bearing screws now revealed. Re-tighten these with the bearing re-positioned centrally. If you decide to lubricate the bearing, use a light oil that will not stiffen with time.
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MSComm1.Output = Chr(&H1F) and so on. To send more than one, MSComm1.