alignhtx

Radio Modification Information

HTX100 Alignment of P.L.L. and Carrier Oscillator Portion

PLL & Carrier Oscillator Alignment Procedure
Step Preset to Adjustment Remarks

1 Mode: RX, CW
S.S.G.:29MHz L302 Connect a DC voltmeter to TP 301.
Adjust L302 for 4V +/-0.1V reading on the DC voltmeter.

2 Same L303 Connect an oscilloscope to TP302
Adjust L303 for maximum reading on the oscilloscope.

3 Same L313 Connect a frequency counter and the oscilloscope to TP303.
Adjust L313 for 10.695 MHz +/-10Hz reading on the frequency counter.

4 Mode: RX, CW
S.S.G.:29.699MHz L312 Connect an oscilloscope to TP307.
Adjust L312 for maximum reading on the oscilloscope.

5 Same L321 Connect a frequency counter and the oscilloscope to TP307.
Adjust L321 for 22.0009 MHz +/-10Hz reading on the frequency counter.

6 Same as step 1. VR303 Adjust VR303 for 22.0000 MHz +/-10Hz reading on the frequency counter

7 Same as step 1. VR302 Connect the oscilloscope to TP305
Adjust VR302 to obtain the waveform as shown on the Fig 1.

8 Same as step 1. VR301 Connect the oscilloscope to TP306
Adjust VR301 to obtain the waveform as shown on the Fig 1.

9 Same as step 4. L317 Connect a DC voltmeter to TP 303.
Adjust L317 for 5.5V +/-0.1V reading on the DC voltmeter.

10 Same as step 7. No Alignment Connect a DC voltmeter to TP 303.
Check if voltage is more than 3V at TP303.

11 Same as step 1. L321 Connect a frequency counter and the oscilloscope to TP304.
Adjust L321 for 38.695 MHz +/-20Hz reading on the frequency counter

12 Mode: TX, CW
S.S.G.:29MHz VR304 Connect a frequency counter and the oscilloscope to TP304.
Adjust VR304 for 38.695 MHz +/-20Hz reading on the frequency counter

13 Mode: RX, CW
S.S.G.:29MHz No Alignment Connect a frequency counter and the oscilloscope to TP301.
Check if the frequency is 38.695 MHz +/-1.0 - 2.0 kHz when turn the RIT volume to
fully clockwise to counterclockwise.Taken from the RS Service Manual # 19-1101 by Rogerbird

PLL & Carrier Oscillator Alignment Procedure
Step	Preset to	Adjustment	Remarks
1	Mode: RX, CW S.S.G.:29MHz	L302	Connect a DC voltmeter to TP 301. Adjust L302 for 4V +/-0.1V reading on the DC voltmeter.
2	Same	L303	Connect an oscilloscope to TP302 Adjust L303 for maximum reading on the oscilloscope.
3	Same	L313	Connect a frequency counter and the oscilloscope to TP303. Adjust L313 for 10.695 MHz +/-10Hz reading on the frequency counter.
4	Mode: RX, CW S.S.G.:29.699MHz	L312	Connect an oscilloscope to TP307. Adjust L312 for maximum reading on the oscilloscope.
5	Same	L321	Connect a frequency counter and the oscilloscope to TP307. Adjust L321 for 22.0009 MHz +/-10Hz reading on the frequency counter.
6	Same as step 1.	VR303	Adjust VR303 for 22.0000 MHz +/-10Hz reading on the frequency counter
7	Same as step 1.	VR302	Connect the oscilloscope to TP305 Adjust VR302 to obtain the waveform as shown on the Fig 1.
8	Same as step 1.	VR301	Connect the oscilloscope to TP306 Adjust VR301 to obtain the waveform as shown on the Fig 1.
9	Same as step 4.	L317	Connect a DC voltmeter to TP 303. Adjust L317 for 5.5V +/-0.1V reading on the DC voltmeter.
10	Same as step 7.	No Alignment	Connect a DC voltmeter to TP 303. Check if voltage is more than 3V at TP303.
11	Same as step 1.	L321	Connect a frequency counter and the oscilloscope to TP304. Adjust L321 for 38.695 MHz +/-20Hz reading on the frequency counter
12	Mode: TX, CW S.S.G.:29MHz	VR304	Connect a frequency counter and the oscilloscope to TP304. Adjust VR304 for 38.695 MHz +/-20Hz reading on the frequency counter
13	Mode: RX, CW S.S.G.:29MHz	No Alignment	Connect a frequency counter and the oscilloscope to TP301. Check if the frequency is 38.695 MHz +/-1.0 - 2.0 kHz when turn the RIT volume to fully clockwise to counterclockwise.Taken from the RS Service Manual # 19-1101 by Rogerbird

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HTX100 Alignment of Transmitter Portion Taken from the RS Service Manual #19-1101 By Rogerbird

Transmitter Alignment Procedure
Step Preset to Adjustment Remarks

1 Mode: SSB
No Modulation VR12 Remove the B001 (PB-100) from the Main PCB.
Connect a DC Ammeter (+) to TP6 (-) to TP5.
Adjust VR11 for 50mA reading on the DC Ammeter.

2 Same VR11 Connect a DC Ammeter (+) to TP6, (-) to TP4.
Adjust VR12 for 50 mA reading on DC Ammeter.

3 OSC 1: 500 Hz
OSC 2: 2400Hz
S1,S2: ON
Mode: SSB L26 Disconnect the DC Ammeter. Reinstall the B001 to the Main PCB.
Connect a RF Power meter to the antenna jack and then, connect a RF SSVM, and oscilloscope across a RF dummy load to the RF power meter.
Adjust L26 for maximum reading on the RF SSVM.
During this step, set the AF S.G. so that the output is less than 20Vp-p. Repeat this step two times.

4 Same VR5 Adjust level of OSC1 and OSC2 for 30 mV reading on the AF SSVM, then adjust VR5 for 36Vp-p reading on the oscilloscope.

5 Pull RF Gain
Control
(Low Power) VR6 Adjust level of OSC1 and OSC2 for 30 mV reading on the AF SSVM, then adjust VR6 for 16Vp-p reading on the oscilloscope.

6 OSC1, OSC2:Off. VR4 Adjust VR4 so that the carrier leakage at SSB and CW becomes minimum and almost equal.

7 Same as step 3. VR9 Adjust level of OSC1 and OSC2 for 30 mV reading on the AF SSVM, then adjust VR9 so that the "9" LED just lights on.

8 Mode:CW
No Modulation VR13 Connect a AF SSVM across a dummy load (8 Ohm) to EXT jack.Connect a key switch to the Key jack. With Key switch ON, adjust VR13 for 0.2V reading on the AF SSVM.

9 Mode:CW
KEY SW: ON No Alignment Check if the RF power level is 23 ~ 29W reading on the RF power meter.

10 Mode:CW
(Low Power)
Pull RF Gain Control No Alignment Check if the RF power level is 3 ~ 7W reading on the RF power meter.
Copied By Rogerbird from the RS Service Manual #19-1101

Transmitter Alignment Procedure
Step	Preset to	Adjustment	Remarks
1	Mode: SSB No Modulation	VR12	Remove the B001 (PB-100) from the Main PCB. Connect a DC Ammeter (+) to TP6 (-) to TP5. Adjust VR11 for 50mA reading on the DC Ammeter.
2	Same	VR11	Connect a DC Ammeter (+) to TP6, (-) to TP4. Adjust VR12 for 50 mA reading on DC Ammeter.
3	OSC 1: 500 Hz OSC 2: 2400Hz S1,S2: ON Mode: SSB	L26	Disconnect the DC Ammeter. Reinstall the B001 to the Main PCB. Connect a RF Power meter to the antenna jack and then, connect a RF SSVM, and oscilloscope across a RF dummy load to the RF power meter. Adjust L26 for maximum reading on the RF SSVM. During this step, set the AF S.G. so that the output is less than 20Vp-p. Repeat this step two times.
4	Same	VR5	Adjust level of OSC1 and OSC2 for 30 mV reading on the AF SSVM, then adjust VR5 for 36Vp-p reading on the oscilloscope.
5	Pull RF Gain Control (Low Power)	VR6	Adjust level of OSC1 and OSC2 for 30 mV reading on the AF SSVM, then adjust VR6 for 16Vp-p reading on the oscilloscope.
6	OSC1, OSC2:Off.	VR4	Adjust VR4 so that the carrier leakage at SSB and CW becomes minimum and almost equal.
7	Same as step 3.	VR9	Adjust level of OSC1 and OSC2 for 30 mV reading on the AF SSVM, then adjust VR9 so that the "9" LED just lights on.
8	Mode:CW No Modulation	VR13	Connect a AF SSVM across a dummy load (8 Ohm) to EXT jack.Connect a key switch to the Key jack. With Key switch ON, adjust VR13 for 0.2V reading on the AF SSVM.
9	Mode:CW KEY SW: ON	No Alignment	Check if the RF power level is 23 ~ 29W reading on the RF power meter.
10	Mode:CW (Low Power) Pull RF Gain Control	No Alignment	Check if the RF power level is 3 ~ 7W reading on the RF power meter. Copied By Rogerbird from the RS Service Manual #19-1101

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HTX100 Alignment of Receiver Portion Taken from the RS Service Manual #19-1101 By Rogerbird

Receiver Alignment Procedure
Step Preset to Adjustment Remarks

1 L2 ~ L5
L7 and L8 Alignment for Sensitivity
Adjust coils for maximum reading of the AF SSVM. (During this step, set the Standard Signal Generator attenuator so that the standard output is less than 0.5W (2v/8ohm)).

2 Squelch: Fully clockwise VR2 Alignment for Squelch
Set the output of the Standard Signal Generator attenuator to 1mV and squelch to maximum. Adjust VR2 so that squelch just breaks.

3 VR1 Alignment of S-Meter
Set the output of the Standard Signal Generator to 100uV, no modulation.
Adjust VR1 so that "9" LCD just lights on.

4 NB: ON L1 Set the level of the Standard Signal Generator to 2uV, then adjust L1 for maximum reading on the oscilloscope. Connect the oscilloscope to TP1. Copied from the RS Service Manual #19-1101 By Rogerbird

Receiver Alignment Procedure
Step	Preset to	Adjustment	Remarks
1		L2 ~ L5 L7 and L8	Alignment for Sensitivity Adjust coils for maximum reading of the AF SSVM. (During this step, set the Standard Signal Generator attenuator so that the standard output is less than 0.5W (2v/8ohm)).
2	Squelch: Fully clockwise	VR2	Alignment for Squelch Set the output of the Standard Signal Generator attenuator to 1mV and squelch to maximum. Adjust VR2 so that squelch just breaks.
3		VR1	Alignment of S-Meter Set the output of the Standard Signal Generator to 100uV, no modulation. Adjust VR1 so that "9" LCD just lights on.
4	NB: ON	L1	Set the level of the Standard Signal Generator to 2uV, then adjust L1 for maximum reading on the oscilloscope. Connect the oscilloscope to TP1. Copied from the RS Service Manual #19-1101 By Rogerbird

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