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Carrier deviation and limiter distortion measurements (low gain)

Prerequisite(s) Unit in set-up mode

Note

Entering Set-up mode is not necessary if the Alternate Method is exercised.

DUT in "Passthru"

Frequency set to middle frequency

LF filter set to "LF 35"
Using the test panel key pad navigate to the "Gain" screen
Press UP button to change audio level to "Gain 22 "

level=22 (changes audio level to 22)

(22)

Apply +3.0VDC, 500mA current limit in at battery contact J8 (J9 is circuit common)

-20 dBu, 250 Hz, low distortion, sinusoidal signal in at audio input rig

Verify at least one audio LED red (both red is OK) (limiter activated)

Measure peak carrier deviation at RF J3

+73 to 77 kHz

(+75)

Measure audio signal distortion at demodulated carrier at RF J3 output

1% THD+N max.

(+0.4)

Power down and Carrier deviation measurement (with pilot and compressor on)

Prerequisite(s) Compressor enabled (power cycle enables compressor and pilot signal)

Pilot enabled (power cycle enables compressor and pilot signal)

Frequency set to middle frequency

Audio Gain set to "AUD 22"

LF filter set to "LF 35"

Adjust audio input at input Rig so -20 LED D5 just switches from GREEN to RED, -10 LED D6 is GREEN (-25
dBu in typically)

Measure peak carrier deviation at RF J3

37 to 41 kHz

(39)

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Содержание HH

Страница 1: ...e to set device programmer GUI to preserve all settings block limiter settings etc In Microchip MPLAB this is done by selecting Programmer Settings Program Preserve EEPROM on program Apply OK Failure to do so will result in loss of all assigned variable values such as frequency block limiter setting indicator settings etc Note This need only be performed at the factory the first time the DUT is po...

Страница 2: ...easurements where noise is a significant factor All audio stimulus signals applied to audio input rig defined at foot of this document All audio stimulus signals are single ended Carrier power for various part numbers are as follows HH 100mW HHAU HH E01 50mW and HH E02 All audio measurements taken with a 10 Hz HPF and 80KHz LPF use filter on audio signal analyzer no modulation analyzer unless othe...

Страница 3: ...udio Board for the Block Momentarily connect audio board TP5 to TP22 enter Set up mode Note Entering Set up mode is not necessary if the Alternate Method is exercised Using the test key pad navigate to the Block screen Press UP or DWN button on the test panel key pad to change unit to desired Block block set freq block 470 19 33 944 standard 400 999 extended Turn DUT Off then back On and check to ...

Страница 4: ...aneously to change frequency to lowest frequency pressing MUNU SEL and UP simultaneously will step the frequency up in increments of 16 only pressing the UP or DOWN buttons will only increment by 1 channel XX set channel 0 00 to 1020 ff in normal tuning mode 80 is 512 Measure DC voltage at radio board TP1 VCO_CONT 0 6 to 1 2 VDC No DC power in at battery contacts Wait until transmitter completely ...

Страница 5: ... 100mW Measure current draw Repeat this process until all 6 carrier signal power points have been adjusted and double checked after the last adjustment has been made Current draw tolerances for test procedure segment 20 50mW 100mW 160 to 196 mA 178 191 to 233 mA 212 Carrier signal power tolerances for test procedure segment 20 50mW 100mW HH 15 to 19dBm 18 to 22dBm HHAU 16 to 17 5dBm HH E01 14 8 to...

Страница 6: ...ents Measure spurs 5 to 1495MHz RBW 30kHz VBW 10kHz 65 dBc Note Neither the 2nd nor the 3rd harmonic should be considered as a spur Measure spurs carrier freq 20MHz RBW 30kHz VBW 10kHz 65 dBc Using the test key pad navigate to the Standby menu and press the MENU SEL to activate RF Mute Measure RF carrier output at radio board J3 60 dBc Press MENU SEL button again to get to the Xmit menu Pressing M...

Страница 7: ...radio board R26 if required 1 2 THD N 0 7 Press UP or DWN button on the test panel key pad for 100 kHz peak carrier deviation at radio board J3 99 to 101 kHz 100 devoff 0 Get deviation offset setting for the Low channel 10 to 10 devoff 0 x set deviation offset for 100KHz 1KHz steps 99 to 101 kHz 100 Press MENU SEL button on the test panel key pad Highest carrier freq is highlighted channel XX set ...

Страница 8: ...tage measurements referenced to circuit common All demodulated carrier and carrier deviation measurements taken with a Hewlett Packard 8901B modulation analyzer with no 8901B filters selected Use of other instruments may yield different results particularly measurements pertaining to noise and phase and measurements where noise is a significant factor All audio stimulus signals applied to audio in...

Страница 9: ...rve behavior of test key pad LCD 000000 HH Vx xx Hybrid frequency Main screen a flashing antenna icon inside a indicates the PLL is not locked Measure current draw 50 to 500 mA 170 Note The goal here is only to ensure the audio board powers up and is not burning up with fever 20 20 Control Panel switch test Prerequisite s FPGA IC programmed Apply 3 0VDC 500mA current limit in at battery contact J8...

Страница 10: ...128 back 64 up 1 down 2 4 4 3 8 2 16 1 32 no button 0 ok 1 no tolerance 1 Release Menu Sel button Press and hold control board Down button Observe change in highlighted menu on LCD buttons realtime button status bitmap menu sel 128 back 64 up 1 down 2 4 4 3 8 2 16 1 32 no button 0 ok 16 no tolerance 16 Release Down button Press and hold control board Up button Observe change in highlighted menu on...

Страница 11: ...on Press and hold control board Mute button Observe change in Menu on LCD the Mute Icon appears buttons realtime button status bitmap menu 1 back 2 mode 4 power 8 down 16 up 32 mute 64 ok 4 no tolerance 4 Release Mute button Press and release Mute until any icons are gone Press and hold Audio board Mute button Observe change in Menu on LCD the Mute Icon appears and flashes buttons realtime button ...

Страница 12: ... 9VDC 1 8 TP9 3 1 to 3 5VDC 3 3 D3 C37 junction 3 to 3 6VDC 3 3 U16 pin5 4 9 to 5 1VDC 5 0 C40 D4 junction 6 9 to 7 1VDC 7 0 TP 3 4 1 to 4 9VDC 4 0 TP1 backlight 2 5 to 2 7VDC 2 6 TP6 1 39 to 1 59VDC 1 49 TP15 TP6 value 50mVDC 10mVDC Phantom power voltage measurements Note Current measurements are made with audio input rig described at the foot of this document attached to the audio input of the a...

Страница 13: ...ents of 16 only pressing the UP or DOWN buttons will only increment by 1 channel XX set channel 0 00 to 1020 ff in normal tuning mode 80 is 512 Adjust radio board C1 for 2 5 VDC at radio board TP1 2 0 to 2 6 VDC 2 5 No DC power in at battery contacts Wait until transmitter completely powers down approx 4 sec Apply 3 0VDC 500mA current limit in at battery contact J8 J9 is circuit common Hold Power ...

Страница 14: ...e as possible measurement Using the test key pad navigate to the PwrCal screen Note This sets the DUT to 50mW carrier power at the Mid carrier frequency from here pressing the UP or DWN buttons adjusts carrier power Pressing MENU SEL button once will move to the lowest carrier freq UP and DWN buttons adjusts carrier power Press MENU SEL again moves to the highest frequency UP and DWN buttons adjus...

Страница 15: ...nput and the ModAn Step thru all 6 PwrCal measurement while checking for spurs using both prescribed setting in the next steps This will result in 12 different spur measurements Measure spurs 5 to 1495MHz RBW 30kHz VBW 10kHz 65 dBc Note Neither the 2nd nor the 3rd harmonic should be considered as a spur Measure spurs carrier freq 20MHz RBW 30kHz VBW 10kHz 65 dBc Using the test key pad navigate to ...

Страница 16: ... on the test panel key pad lowest carrier frequency is highlighted channel XX set channel 0 00 to 1020 ff in normal tuning mode 80 is 512 Measure distortion at demodulated carrier at RF Board J3 1 2 THD N 0 7 Press Up or Down button on test key pad for 100KHz peak deviation at RF Board J3 99 to 101KHz 100 devoff 0 Get deviation offset setting for the Low channel 10 to 10 devoff 0 x set deviation o...

Страница 17: ...ne screen menu function that allows offset of carrier frequency Press UP or DWN button on the test panel key pad to fine adjust middle carrier frequency 2kHz finetune gets setting finetune xx set fine frequency correction 16 to 15 3 125 kHz steps Pilot signal deviation frequency measurements Prerequisite s no audio in at audio input rig Gain set to 0 level 0 changes audio level to 0 Using the test...

Страница 18: ...ltaneously to change frequency to highest frequency pressing MUNU SEL and UP simultaneously will step the frequency up in increments of 16 only pressing the UP or DOWN buttons will only increment by 1 channel XX set channel 0 00 to 1020 ff in normal tuning mode 80 is 512 Using the test panel key pad navigate to the Gainsw screen select low gain gainsw 2 Measure Noise noise signal amplitude at radi...

Страница 19: ... if the Alternate Method is exercised DUT in Passthru FREQ set to highest frequency Audio Gain set to Gain 45 Gainsw set to auto 55 dBu 250Hz low distortion sinusoidal signal in at audio input rig Note Neither audio board LED D5 nor D6 are red limiter not activated Note It is vital that the demodulation device typically an FM modulation meter analyzer not be permitted to auto range while performin...

Страница 20: ...t to highest frequency Audio Gain set to Gain 0 Gainsw set to auto Note Entering Set up mode is not necessary if the Alternate Method is exercised 10 dBu 250Hz low distortion sinusoidal signal in at audio input rig Verify neither audio board LED D5 nor D6 are red limiter not activated Measure audio signal distortion of the demodulated carrier radio board RF J3 at carrier frequency Highest freq 0 5...

Страница 21: ...calibration mode 0 Measure and record audio signal amplitude at demodulated carrier RF J3 Reference for remainder of step Press MENU SEL button on the test panel key pad until 5 XX is highlighted limitcal 2 sets limiter calibration mode to calibrated drop 2 Press UP or DWN button for 5 dB below reference amplitude in step 40 130 60 Reference value 3 5 to 6 5 dB 5 Adjust lscale for 5 dB below refer...

Страница 22: ...peat this step maximum or three times before succumbing to despair If neither sub step 40 130 130 10 or 40 130 130 20are true repeat this step maximum or three times before succumbing to despair Using the test panel key pad navigate to the frequency Main screen Frequency response measurement low gain branch LF rolloff pot taper Phase mesurement Prerequisite s Unit in set up mode Note Entering Set ...

Страница 23: ...measurement high gain branch Prerequisite s Unit in set up mode Note Entering Set up mode is not necessary if the Alternate Method is exercised DUT in Passthru FREQ set to middle frequency LF filter set to LF 35 Using the test panel key pad navigate to the Gain screen Press DWN button to change audio level to Gain 15 level 15 changes audio level to 15 15 Gainsw set to Low gain gainsw 2 sets codec ...

Страница 24: ... demodulated carrier 250Hz ref at RF J3 20 kHz 2 to 3 dB r 0 5 10 kHz 1 to 1 dB r 0 1 1 kHz 1 to 1 dB r 0 1 50 Hz 1 5 to 1 5 dB r 0 8 31 5 Hz 5 to 1 db r 3 1 35 dBu 250 Hz low distortion sinusoidal signal in at audio input rig Measure Phase response of demodulated carrier at RF board J3 20 kHz 53 10 kHz 153 400 Hz 160 50 Hz 170 Using the test panel key pad navigate to the Gainsw select auto gainsw...

Страница 25: ...atcal 3 Forces battery telemetry high check for frequency shift of 3 5KHZ Press UP or DWN button on the test panel key pad to adjust for 3 5 KHz freq shift 3 5 KHz 0 1 3 5 bscale xx set battery telemetry scale setting 26 to 80 to adjust for 3 5KHz frequency shift 3 5 KHz 0 1 3 5 Repeat steps 40 180 40 to step 40 180 50 until no further adjustment is necessary to achieve 3 5 KHz freq shift Using th...

Страница 26: ...al signal in at audio input rig Verify at least one audio LED red both red is OK limiter activated Measure peak carrier deviation at RF J3 73 to 77 kHz 75 Measure audio signal distortion at demodulated carrier at RF J3 output 1 THD N max 0 4 Power down and Carrier deviation measurement with pilot and compressor on Prerequisite s Compressor enabled power cycle enables compressor and pilot signal Pi...

Страница 27: ...re current draw 170 to 190mA 180 Press the power button for 4 second while DUT powers down Measure current draw 0 to 5mA 0 Audio input rig single ended audio signal source Lectrosonics Inc The linked image cannot be displayed The file may have been moved renamed or deleted Verify that the link points to the correct file and location ...

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