Kenwood TS-820 Скачать руководство пользователя страница 8 | Manualshive

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Kenwood TS-820 Скачать руководство пользователя страница 8

8

1.

Remove resistor R27 (1Kohm) on AF-AVR unit (X49-1080-00).

2.

Install a 10Kohm resistor on foil side of AF-AVR unit. See figure 1.

3.

Install a 1 Kohm resistor on RIT control. See figure 2.

4.

Install a capacitor (3.3uF - 10uF) between RIT control and ground. See figure 2.

5.

Adjust VR-2 on AF-AVR unit (X49-1080-00) for the same frequency as the
center position of the RIT control.

Microphone input attenuator for TS-820

Author:

Trio-Kenwood Communication, inc.

Service bulletin no. 14 (16-2-1977)

When using a high output microphone (i.e. Shure 444), it is very likely that there will be
distortion of the transmitted audio if the processor is used. The reason the distortion
occurs is because the processor is between the first microphone amplifier and the
microphone gain control. The installation of one of the attenuators shown below will
reduce the microphone input to a level that will not cause RF speech processor
distortion. The attenuator figures are approximate.

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Содержание TS-820

Страница 1: ...part number of the new display unit is X54 1310 00 Please use this part number when ordering a replacement display unit The new display unit is being installed in the current production of the TS 820S and DG 1 The new display unit X54 1310 00 is a little more involved to install than the old one The installation is as follows 1 Remove the top cover of the TS 820 or TS 820S and set the unit on the ...

Страница 2: ...the FIX CH switch to 4 will operate the SSB filter 6 in CW mode TS 820S Series Transceivers 1 Similar to the TS 520 series a miniature SPDT toggle switch may be installed at the operators preference a the rear or on the obttom cover 2 The FIX CH switch or Digital Hold switch may be rewired to control the CW wide narrow function On the MODE switch S6 1 the SSB filter control is GREEN and the CW fil...

Страница 3: ...eeded for the band desired Install T11 last 17 Replace the VCO unit in the PLL assembly 18 Install the connectors on the PLL assembly ALIGNMENT 1 Turn on the TS 820 2 Tune VFO to 250 3 Set band switch to AUX 4 Set the TUN NOR switch on the VCO unit to TUN 5 Connect a frequency counter to terminals TP5 and TP6 on the VCO unit TP6 is ground 6 Adjust T11 for a frequency of 9 08 MHz plus the lower lim...

Страница 4: ... excess solder and while the screws are still hot turn the board upside down to allow the screws to fall onto the working surface Figure 3 10 Secure the new mounting screws with the two nuts that were removed in step 8 Figure 3 11 Install the heat sink and secure it with the two hexagon bosses from the kit Figure 3 12 Insert the wires from the new audio amplifier circuit board as shown in the diag...

Страница 5: ... 2 is not changed when changing audio gen from 400 Hz to 2000Hz 4 Turn compression level to max CW Set audio gen to 1500Hz at 0 3 mv Adjust TC 3 and VR 6 carrier bal for speech proc for maximum level at TP 2 5 Set audio gen to 10 mv at 1500Hz Send Rec switch to send Adjust VR 7 comp level for speech processor so that the level at TP 2 is not changed when turning the processor on and off VR 7 shoul...

Страница 6: ...s bad Q13 on FIX VOX unit 2 25 kHz calibrator will not zero Add 3 pf in parallel with TC 1 on the marker unit 3 Receiver sensitivity down Q2 on RF unit 9v on PD unit is shorted L 6 shorted to ground 4 Intermittant receive when moving set Check for touching terminals at final relay socket 5 No receiver or digital 14v wire pinched between DG 1 chassis and ground 6 Receiver sensitivity 40 db down Che...

Страница 7: ... and LSB realign carrier unit per TKC specifications 18 No loading on 40 meters Foil path is open on RF coil pack 19 No tX when using send switch Bad R28 1K and Q9 on FIX VOX unit 20 Blows fuse Check for shorted C21 C22 100uf 500v 21 No drive no TX or bias Open screen resistor R6 470 ohm at rectfier unit 22 VFO intermittant Check for cold solder at VFO power plug 23 Audio distortion on TX with pro...

Страница 8: ...hone input attenuator for TS 820 Author Trio Kenwood Communication inc Service bulletin no 14 16 2 1977 When using a high output microphone i e Shure 444 it is very likely that there will be distortion of the transmitted audio if the processor is used The reason the distortion occurs is because the processor is between the first microphone amplifier and the microphone gain control The installation...

Страница 9: ...ay be done quicker This may be used in lieu of the alignment procedure in the Service Manual 1 Adjustment A V R unit X49 1080 00 a Adjust VR1 for 3 3V b Adjust VR4 for 9V 2 Adjustment V C O unit X50 1330 00 a PLace ST to TONE and connect a frequency counter tp TP5 b Adjust T1 T11 for proper frequency See table Note from www mods dk I m not sure about the data in the table are correct because the d...

Страница 10: ... 1140 00 a Turn screen grid S G switch rear panel OFF heater switch ON b Center DRIVER control c Peak coil pack all bands for max reading on panel meter in TX and RX except WWV in TX Adjustment sequency Band VFO meate 1 1 8 100 2 3 5 250 3 7 150 4 14 175 5 WWV 0 15 0 MHz 6 21 225 7 28 5 500 5 6 Carrier point X50 1310 00 a Peak TX power in CW mode Then switch to LSB and modulate with Audio Gen A G ...

Страница 11: ...and adjust TC4 to 451 9 200 Hz Adjust T11 T12 T13 for peak indication on COMP meter f Peak T14 by scope on TP2 g Turn processor full C C W and reduce A G gain to 1mv 400Hz h Adjust TC4 for max level n scope but at proper frequency 451 9 200Hz May adjust slightly off frequency if higher peak can be obtained i Sweep A G frequency from 400Hz to 2000Hz and check for balanced output on LSB and USB j CO...

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