S/N: 13677Low Pass Branch Testing After Repair & Tuning
Celwave Model 497 VHF Duplexer
Isolation: 103.43 dBInsertion Loss: 1.20 dB
Return Loss: 36.79 dBVSWR: 1.029:1Match Efficiency: 99.979%
Services by DuplexerRepair(334) 444-6796
(A division of Alabama Broadcast Services, LLC)www.DuplexerRepair.com
1:Mkr (MHz) dB 2:Mkr (MHz) dB
1: 146.03 -1.20 1> 146.03 -36.79
2> 146.62 -103.43 2: 146.62 -0.13
-140
-120
-100
-80
-60
-20
0
20
Abs
dB
Ch1
Ch2
1:Transmission /M Log Mag 20.0 dB/ Ref -40.00 dB
2:Reflection /M Log Mag 5.0 dB/ Ref 0.00 dB
Start 145.025 MHz Stop 147.625 MHzStart 145.025 MHz Stop 147.625 MHz
1
2Celwave SN: 13677 LPB
2019-05-13 15:37:24
1
2
Ch1:Mkr2 146.625 MHz
-103.43 dB
1
2
Ch2:Mkr1 146.025 MHz
-36.79 dB
S/N: 13677High Pass Branch Testing After Repair & Tuning
Celwave Model 497 VHF Duplexer
Isolation: 103.25 dBInsertion Loss: 0.82 dB
Return Loss: 31.99 dBVSWR: 1.052:1Match Efficiency: 99.937%
Services by DuplexerRepair(334) 444-6796
(A division of Alabama Broadcast Services, LLC)www.DuplexerRepair.com
1:Mkr (MHz) dB 2:Mkr (MHz) dB
1> 146.03 -103.25 1: 146.03 -0.20
2: 146.62 -0.82 2> 146.62 -31.99
-140
-120
-100
-80
-60
-20
0
20
Abs
dB
Ch1
Ch2
1:Transmission /M Log Mag 20.0 dB/ Ref -40.00 dB
2:Reflection /M Log Mag 5.0 dB/ Ref 0.00 dB
Start 145.025 MHz Stop 147.625 MHzStart 145.025 MHz Stop 147.625 MHz
12
Celwave SN: 13677 HPB
2019-05-13 15:44:45
1
2
Ch1:Mkr1 146.025 MHz
-103.25 dB1
2
Ch2:Mkr2 146.625 MHz
-31.99 dB
S/N: 13677Service & Repair Photos
Celwave Model 497 VHF Duplexer
Services by DuplexerRepair(334) 444-6796
(A division of Alabama Broadcast Services, LLC)www.DuplexerRepair.com
Loop/notch assembly with damaged threads on notch adjustment rod. Could not be adjusted/tuned prior to repair.
S/N: 13677Service & Repair Photos
Celwave Model 497 VHF Duplexer
Services by DuplexerRepair(334) 444-6796
(A division of Alabama Broadcast Services, LLC)www.DuplexerRepair.com
Amount of metal fragments which came out of female threads upon re-tapping/re-running threads. Most of this came from the threaded notch tuning rod, but some were from the female threads themselves.
Threads on notch/reject tuning rod re-run and polished. After thread repairs, notch/reject tuning rod would thread through entire range with two fingers.
Notch/reject tuning rod threaded fully into cavity, as seen from lower end of cylinder.
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