Microlab T9753UHF Manual

ALIGNMENT PROCEDURE
T9753UHF
Doc No.:ALG-T9753-01
Rev : 01
Date : 20060307
Total Pages : 4
Prepared by : ____________________
Approved by : ____________________

Microlab Electronics Ltd. ALG-T9753UHF Rev:01
Page 2 of 3
1. TRANSIMITTER ALIGNMENT (TEST CONDITION: USE 7.4VDC 1.2A SUPPLY)
NO. ITEM ALIGNMENT METHOD (WITH PRODUCTION SPEC.) REMARKS
1.1 Check LCD
1. Switch on the power ( SW451), check all segments should display clearly
& correctly.
2. Check the current should be <40mA.
1.2 Rx / Tx VCO 1. Connect a voltmeter between CV test point and ground
2. Check Rx VCO should be 1.2+/- 0.3V on Frequency 435MHz.
3. Connect PTT button to ground.
4. Check Tx VCO should be 1.5+/- 0.5V on Frequency 435MHz.
5. Release PTT button. Press and hold the MON button monitor green light
will be on.
1.3 Tx Frequency 1. Connect PPT button to ground and select frequency 435MHz
2. Adjust VC2 until Tx frequency should be435MHz+/- 0.30kHz.
1.4 Tx Power 1. Connect PPT button to ground and select frequency 400MHz and
frequency 470MHz
2. Check Tx power should be ≥36dBm at Ant point
1.5 Tx Modulation
Check CTCSS
Tone Dev.
Check CTCSS
Freq. Error
Check Max.
Deviation
1. Connect PTT button to ground and Select frequency 435MHz
2. Apply 6mVrms (-44dBV) with 1kHz at mic input.
3. Adjust VR552 until the frequency deviation1.5k +/- 0.1 kHz and check
distortion should less than 3%.
4. And also check if Tx frequency response as below:
300Hz = 1+/- 0.2kHz. and 1.5kHz = 3.0kHz +/- 0.2kHz.
5. Select frequency 400MHz with Code 1, 12, 38 , the CTCSS Dev = 0.6
+0/-0.15 kHz
6. Select frequency 470MHz with code 1, 12,38, the CTCSS Dev = 0.6 +0/-
0.15kHz
7. Check CTCSS Code 12 should be 100Hz+/-0.2%.
8. Increased mic input signal to +40dB, check max deviation should less than
2kHz and less than 2.5k with CTCSS.
1.6 Tx FM Noise 1. Connect PPT button to ground.
2. Connect 220uF E.Cap to mic input and ground.
3. Check FM noise should less than 300Hz at frequency 400MHz and
frequency 470MHz.
1.7 Current Drain
at max. Dev
1. Connect PTT button to ground and selected frequency 435MHz.
2. Check Tx current should less than 1600 mA with max deviation.
2. RECIEVER ALIGNMENT (TEST CONDITION: USE 7.4VDC3A SUPPLY)
NO. ITEM ALIGNMENT METHOD (WITH PRODUCTION SPEC.) REMARKS
2.1 Check Rx
Audio Level
Rated Audio
Output Power
1. Set RF generator to435MHz and set RF output to –47dBm with 1.5kHz
deviation/1kHz.
2. Terminated speaker point with 4 ohm load.
3. Set speaker output level to 1.0V of unit. Check distortion should be less
then 3%.
4. Set speaker output level to 1.5Vrms. Check distortion should be less then
4.5%.
5. Set speaker output level to max. Check distortion should <10%.

Microlab Electronics Ltd. ALG-T9753UHF Rev:01
Page 3 of 3
2.2 Check Rx
Audio
Response
1. Set RF generator to 435MHz and set RF output to –47dBm with 1.5kHz
deviation/1kHz.
2. Set speaker output to 1.0Vof unit with input signal is 1kHz as reference
point (0dB).
3. Check Freq. Response : 300Hz =-2 +/-3dB and 2.5kHz = -6 +/-3dB
2.3 Rx Sensitivity 1. Set RF generator to 435MHz and set RF output to –47dBm with 1.5kHz
deviation/1kHz.
2. Set speaker output to1.0V of unit and decrease RF output level to 12 dB
sinad.
3. Check RF output level of RF generator should less than -123dBm .
4. Set RF generator to CH15 with 2.5kHz dev/1kHz.and decrease RF output
level to 12 dB sinad.
5. The RF output level should less than –123dBm.
2.4 S/N ratio 1. Set RF generator to435MHz and set RF output to –47dBm without
modulation.
2. Set speaker output to max of unit.
3. Check (speaker output) S/N ratio should be >40dB.
2.5 Rx Audio with
CTCSS
Check RX
Sens. with
CTCSS
Check CTCSS
Tone Decoder
1. Select 435MHz with CTCSS Code 12.
2. Apply –47dBm RF signal with 1.5kHz deviation/1kHz and external input
of RF Gen with 0.6kHz deviation/100Hz as CTCSS code.
3. A 1kHz signal will be heard from speaker.
4. Set speaker output to1.0V and decrease RF level to 8dB sinad.
5. The speaker should be on.
6. Increase RF output level to –47dBm and change the external input Freq. of
RF Gen. to 200Hz.
7. The speaker should be off.
3. DC CURRENT DRAIN
(TEST CONDITION: USE 7.4VDC 3A SUPPLY ONLY)
NO. ITEM ALIGNMENT METHOD (WITH PRODUCTION SPEC.) REMARKS
3.1 Check Battery Low
1. Set the power supply to 5.1V+/-0.15V. Battery low icon should
be flashing.
3.2 Check Standby Current
(squelched)
1. Check the standby current should less than 40mA(squelched).
3.3 Max . Audio Output 1. Adjust speaker volume to set speaker output level >1.0Vand
distortion 5%.
2. Check current should less than 200mA.
3.4 Check charging current 1. Switch off the unit. Check charging current should less than
300+/-30mA with 9Vdc/800mA DC adaptor.
Notice: The other functional tests, please referred to T9753 Operation Specification.
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