CAUTION:
Use isolation transformer or observe polarity when connecting test equipment.
Allow a 15-minute warm-up period.
Adjustments made with 13.8 volt DC input.
Connect low sides of test equipment to ground unless specified otherwise.
Connect 50-ohm dummy load or antenna before keying transmitter.
Connect microphone.
Suggested Alignment Tools:
GC
ELECTRONICS:
L36, L38 9091,8728-A,8728
CAI, CT2 8276,5000
L3, L13, LI5 ............. 5009,8728-A,8728
L1, L2, L4 the L10, L12, L14, L19 through L23
L30, L31, L45 through to L48 9440
| Test setup | Preset to: | Adjustment: | Notes: |
| Input
of frequency counter through a 47pF capacitor to TP20 (IC1 Pin 7). |
Ch. 19, AM | Check for 10.240MHz. | |
| Input of oscilloscope to TP21 (L21 Secondary). | Ch. 19, AM | L21 | Adjust for maximum. |
|
Input of frequency counter to TP21 (L21 Secondary) |
Ch. 19, USB Clarifier Midrange |
CT1 | Adjust for 33.9765MHz. |
|
Ch. 19, AM Clarifier Midrange |
L23 | Adjust for 33.975MHz. | |
|
Ch. 19, LSB Clarifier Midrange |
L22 | Adjust for 33.9735MHz. | |
| Input of DC meter to TP9. |
Ch. 40, AM Clarifier Midrange |
L19 | Adjust for 3.6 volts. |
| Input of oscilloscope to TP1. |
Ch. 19, AM Clarifier Midrange |
L20 | Adjust for maximum. |
| Input of frequency counter to TP1. | Ch. 19, USB |
Check for 34.7665MHz. Check
all channels. |
|
| Ch. 19, AM |
Check for 34.765MHz. Check
all channels. |
||
| Ch. 19, LSB |
Check for 34.7635MHz. Check
all channels. |
||
| Input of frequency counter to TP10 | Ch. 1, AM |
Check for .790MHz. Check
all channels. |
|
| Input of frequency counter to TP3. | Ch. 19, USB | CT2 | Adjust for 7.801514MHz +5Hz, -0Hz. |
| Ch. 19, LSB | L30 | Adjust for 7.7985MHz +0Hz, -5Hz. | |
| Ch. 19, AM, Transmit | L31 | Disconnect
TP7 and TP8. Adjust for 7.8000MHz +5Hz. Reconnect TP7 and TP8. |
|
Input of frequency counter to TP22 (TR9 Emitter). |
Ch. 19, AM | Check for 7.345MHz. | |
| Input
of frequency counter to antenna jack. |
Ch. 19, AM, Transmit | VR5 | Adjust for 27.185MHz. |
Connect an AC VTVM or AF Watt meter across speaker voice coil. Adjust
volume control to obtain a suitable indication. Set generator output low
enough to prevent AGC limiting. RF Gain Maximum, Clarifier Midrange, Squelch
MINIMUM, NB/AN;- Off, AM
| Test setup: | Preset to: | Adjustments: | Notes: |
| output
of signal generator through a .0luF capacitor to TP23 (FET1 G1). 455kHz, 1000Hz @ 30% modulation. |
Ch.19, AM | L15,Ll3,L3 | Adjust for maximum. |
| Output
of signal generator through a .0luF capacitor to antenna jack. 27.185MHz, 1000Hz @ 30% modulation. |
Ch. 19, AM | L10,L9,L8,L7,L6,L5,L4 |
Adjust for maximum. If
necessary, readjust |
|
Input
of oscilloscope to TP25 NB/ANL On Inject a 100pps, luSec. Pulse width signal. |
Ch. 19, AM, NB/ANL on | L2,L1 | Adjust for maximum. |
Connect an AC VTVM or AF wattmeter across speaker voice coil. Adjust volume
control to obtain a suitable indication. Set generator output low enough to
prevent AGC limiting. RF Gain Maximum, Clarifier Midrange, Squelch MINIMUM,
NB/ANL Off.
| Test setup: | Preset to: | Adjustments: | Notes: |
| output of signal generator through a .0luF capacitor to TP24 (TR15 Emitter). 7.8005MHz, no modulation. | Ch. 19, USB | L14,L12,L10, L9,L8,L7 | Adjust for maximum output. |
| Output of signal generator through .0luF to antenna jack. 27.186MHz, no modulation.' | Ch. 19, USB | L6, L5, L4 | Adjust for maximum output. If necessary, readjust L7,L8, L9, L10, L12 and L14. |
Connect an AC VTVM or AF wattmeter across speaker voice coil. Adjust volume
control to obtain a suitable indication. RF Gain Maximum, Clarifier Midrange,
Squelch MINIMUM, NB/ANL Off, MOD/S/RF S/RF
| Test setup: | Preset to: | Adjustments: | Notes: |
| output
of signal generator through .0luF to antenna jack. Squelch Maximum 27.185MHz, 1000Hz @ 30% modulation. Output 1000uV. |
Ch. 19, AM, Squelch at maximum | VR3 | SQUELCH RANGE Adjust so that squelch Just breaks. |
| Output
of signal generator through .0luF to antenna jack. 27.185MHz, 1000Hz @ 30% modulation. Output 100uV. |
Ch. 19, AM | VR1 | AM
SIGNAL METER Adjust for 9 on S scale of meter. |
| Output
of signal generator through .01uF to antenna jack. 27.186MHz, no modulation. Output, 100uV. |
Ch. 19, USB | VR2 | SSB SIGNAL METER Adjust for 9 on S scale of meter. |
Connect an RF wattmeter and 50-ohm, 25-watt dummy load to antenna connector.
NOTE: Be sure to check transmit frequency and power on all active channels
after alignment of transmitter.
| Test Setup: | Preset To: | Adjustments: | Notes: |
| Input of spectrum analyzer or harmonic meter to antenna Jack. | Ch. 19 | L36 | Adjust for MINIMUM at 54MHz. |
Connect an RF wattmeter and 50 Ohm, 25-watt dummy load to antenna connector.
NOTE: Be sure to check transmit frequency and power on all active channels
after
alignment of transmitter.
| Test Setup : | Preset To: | Adjust: | Notes: |
| Inject
a 1000Hz, IOOmV signal at mic input. |
Ch. 19, USB, Mike gain at maximum | L47,L48,L46, L45,L38 |
Set Villa fully clockwise. Mike Gain Maximum Adjust for maximum. Readjust VR11 |
| Test Setup: | Preset To: | Adjustments: | Notes: |
| Input
of oscilloscope to antenna jack. No signal input. |
Ch. 19, USB | VR4 | BALANCE
Adjust for MINIMUM RF. |
| Insert
DC current meter at TP8. No signal input. |
Ch. 19, USB | VR9 | BIAS Adjust for 25mA. |
| Insert
DC current meter at TP7. No signal input. |
Ch. 19, USB | VR8 | BIAS Adjust for 5OmA. |
|
Input
of RF Watt meter to antenna jack. |
Ch. 19, USB Mike Gain Maximum |
VR11 | SSB POWER Adjust for 11 watts. |
| Input
of RF Watt meter to antenna jack. No signal input. |
Ch. 19, AM | VR10 | AM POWER Adjust for 3.8 watts. |
| Input
of RF Watt meter to antenna jack. |
Ch. 19, AM MOD/S/RF S/RF |
VR6 | TX PWR METER Adjust VR6 so that TX PWR meter agrees with RF Watt meter |
| Input
of oscilloscope or modulation meter to antenna connector. Inject a 1000Hz signal at mic input. |
Ch. 19, AM MOD/S/RF Modulation Mike Gain Maximum |
VR7 | MOD METER Adjust audio level to obtain approximately 100% modulation. Adjust VR7 to read in the 100% area on MOD scale of meter. |
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