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Block Diagram

VX-261 VHF FM Transceiver Service Manual

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Summary of Contents for VX-261

Page 1: ...complete alignment of this transceiver to be performed without opening the case of the radio all adjustments can be performed from the front panel using the Alignment Mode menu While we believe the information in this manual to be correct Vertex Standard assumes no li ability for damage that may occur as a result of typographical or other errors that may be present Your cooperation in pointing out...

Page 2: ...4 x 109 x 39 9 mm with FNB V134LI UNI Weight Approx 9 9 oz 281 g with FNB V133LI UNI Antenna Belt Clip 11 6 oz 330 g with FNB V134LI UNI Antenna Belt Clip Receiver Measured by TIA EIA 603 Circuit Type Double Conversion Super heterodyne Sensitivity 12 dB SINAD 0 25 µV Adjacent Channel Selectivity 65 60 dB W N Hum and Noise 40 dB Intermodulation 65 dB Spurious Image Rejection 70 dB Conducted Spuriou...

Page 3: ...PTION BIND HEAD TAPTITE B 2X10 PAN HEAD TAPTITE B M2X5 VXSTD P N U24110001 U44105001 QTY 2 13 REF FRONT CASE ASSY Component FRONT CASE NON KEY NAME PLATE MODEL LABEL VX 261 RUBBER PTT FLAME PTT RUBBER SIDE LATCH NAIL LATCH PLATE COIL SPRING 2 2x12x0 25 x2 pcs INDICATOR SPEAKER SP NET WIRE ASSY BLK WIRE ASSY YEL SHIELD SHEET SHEET MICROTEX 8x4 PAN HEAD SCREW M2x3BUS 2 MAIN UNIT Component Printed Ci...

Page 4: ...CX24 A H7901530A CF1001 CERAMIC FILTER LTM450GW A H3900573A CF1002 CERAMIC FILTER LTM450EW A H3900574A F 1001 CHIP FUSE 3 15A 36V FHC16 322ADTP Q0000118 MC1001 MIC ELEMENT PF0 1055P M3290045 Q 1012 FET RQA0011DNS G3070392 S 1001 TACT SWITCH EVQPUB02K N5090167 S 1002 TACT SWITCH EVQPUB02K N5090167 S 1003 TACT SWITCH EVQPUB02K N5090167 S 1004 ROTARY SWITCH TP7LBJT16 RY 10487 N0190199 TH1001 THERMIST...

Page 5: ...Block Diagram VX 261 VHF FM Transceiver Service Manual 5 ...

Page 6: ...ator CD1001 JT BM450CX24 1 4 Audio amplifier The detected signal from Q1040 AA32416 is supplied to the AF adder Q1045 1 NJM12902V through the TX RX switch Q1057 2 SN74LV4066A high pass filter Q1045 2 NJM12902V and mute switch Q1057 4 SN74LV4066A The audio signal from Q1045 1 NJM12902V is sup plied to the audio amplifier Q1008 TDA2822L through the AF volume potentiometer VR1001 As a result the audi...

Page 7: ...into two levels Transmit Power High and Low controlled by the Electric Vol ume IC Q1018 AK2330 3 PLL Frequency Synthesizer 3 1 VCO Voltage Controlled Oscillator While the radio is receiving the RX VCO Q1029 CPH3910 generates a programmed frequency between 186 85 and 224 85 MHz as 1st local signal While the radio is transmitting the TX VCO Q1037 2SC4227 generates a frequency between 136 and 174 MHz...

Page 8: ...est equipment is not covered under the warranty policy While most steps do not require all of the equipment listed the interactions of some adjustments may require that more complex adjust ments be performed afterwards Do not attempt to perform only a single step unless it is clearly isolated electrically from all other steps Have all test equipment ready before beginning and follow all of the ste...

Page 9: ...wn arrow key for channel up down direct number input and drag the mouse Note when all items are aligned it is strongly recom mended to align according to following order The detail information is written in the help document of CE150 PC Programming Software 1 PLL Reference Frequency Frequency 2 RX Sensitivity RX Tune 3 Squelch SQL RSSI 4 TX Power High Low 5 Maximum Deviation Wide Narrow Please adj...

Page 10: ...equency Frequency alignment must be done before this alignment is performed 1 Press the RX Tune button to open the RX Sensitivity Alignment window will appear 2 Click the slide bar of the desired channel The radio switches to the selected channel 3 Set the RF Signal Generator according to the indication at the top of the screen Setting Your SG as followings 4 Set the value to get the best RX sensi...

Page 11: ...Narrow 2 5k The procedure for all the alignments is as follows 1 Click the SQL button to open the SQL Alignment menu 2 Click the Start button on the desired alignment item to open other window 3 Set the RF Signal Generator according to the indication of the window then click the OK button 4 The automatic alignment will start to get the optimum level 5 The alignment result will appear in the New bo...

Page 12: ... only on the selected channel All Freq Alignment value changes on all channels Alignment ê 5 Maximum Deviation Wide Narrow This parameter align the Maximum Deviation Wide Narrow 1 Press the Max Dev W N button to open the Max Devia tion Alignment window 2 Set the Audio Signal Generator to 100 mV with a 1 kHz tone Sine Wave 3 Click the PTT button on the desired channel The radio starts to transmit o...

Page 13: ...select the channel for alignment Default Single Alignment value changes only on the selected channel All Freq Alignment value changes on all channels Alignment DCS Deviation Wide Narrow This parameter is to align the DCS Deviation of the selected channel 1 Press the DCS Dev W N button to open the DCS Devia tion Alignment window 2 Click the PTT button on the desired channel The radio starts to tran...

Page 14: ...utton to finish the DTMF Deviation align ment and save the data Alignment Sequential Tone Deviation This parameter align the Sequential Tone Deviation for the 2 Tone and 5 Tone Encoder 1 Press the Seq Tone button to open the Sequential Tone De viation Alignment window will appear 2 Click the PTT button to transmit the radio on the center fre quency channel 3 Set the value to get desired deviation ...

Page 15: ...on does not matter When Clone mode is successfully activated in this step 5 On the Destination transceiver press the SIDE 1 switch The LED indicator on the top of the transceiv er will glow Green 6 Press the PTT switch on the Source transceiver The LED indicator on the top of the transceiver will glow Red and the data will be transferred 7 If there is a problem during the cloning process the LED i...

Page 16: ...Main Unit Circuit Diagram VX 261 VHF FM Transceiver Service Manual 16 ...

Page 17: ... of this manual may be reproduced without the per mission of Vertex Standard LMR Inc Vertex Standard is a trademark of Vertex Standard LMR Inc All other trademarks are the property of their respective owners 2015 Vertex Standard LMR Inc All rights reserved ...

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