Service manual
TH-K4AT/K4E
36
1.RX BPF Squelch level: 0
Adjust 1) Frequency: 435.050MHz SSG TX-RX ANT VOL Turn the VOL knob 0.63V
SSG output: –53dBm (501 uV)
Oscilloscope (A/3) SP knob to obtain 0.63V AF
SSG MOD: 1kHz Distortion meter output.
SSG DEV: 3kHz AF V.M
Switch to Adjustment mode Dummy load
and carry out the operations
for adjustment item E.
(Refer to page 29)
2) LCD display: BPL Encoder Write Max Sensitivity
Frequency: 400.050MHz [MENU]
SSG: –119dBm (0.25 uV)
3) SSG: –110dBm (0.707 uV) Check 12dB SINAD or
more
4) LCD display: BPC Encoder Write Max Sensitivity
Frequency: 435.050MHz [MENU]
SSG: –120dBm (0.22 uV)
5) SSG: –120dBm (0.22 uV) Check 12dB SINAD or
more
6) LCD display: BPH Encoder Write Max Sensitivity
Frequency: 469.990MHz [MENU]
SSG: –121dBm (0.199 uV)
7) SSG: –113dBm (0.501uV) Check 12dB SINAD or
more
2.IF response 1) Frequency : 469.990MHz SSG Check 12dB SINAD or
Check
SSG Frequency: 450.565MHz
Oscilloscope less
SSG output: –53dBm (501uV)
Distortion meter
Note: If the
SSG MOD: 1kHz
specification is not
SSG DEV: 3kHz
satisfied, repeat the
AF output: 0.63V/8Ω
operations for
2) Frequency : 400.050MHz
“1. RX BPF
SSG Frequency: 380.625MHz
Ad
just”.
SSG output: –53dBm (501uV)
3) Frequency : 435.000MHz
SSG Frequency: 415.575MHz
SSG output: –53dBm (501uV)
3.Squelch / Switch to Adjustment mode SSG ANT
S-meter and carry out the operations
Write for adjustment item C.
(Refer to page 28)
1) LCD display: SQ1 [MENU] Write Note: In the
Frequency: 435.050MHz Squelch adjust
SSG: –125dBm (0.126uV) ments, all 4
Squelch 2) LCD display: SQ2 [MENU] Write adjusting points
Frequency: 435.050MHz including the S-
SSG: –120dBm (0.22uV) meter must be
adjusted.
ADJUSTMENT
Receiver section
Item Condition
Measurement Adjustment
Specifications/
Test equipment Unit
Terminal
Unit
Parts Method
Remarks