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045.SB814.DOC
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1993-04-19
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846b
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30 lines
SB-814
TR-2400 UNLOCK 2-19-80
For apparent unlock, or either RX or TX failure, suspect not PLL unlock,
but low RX or TX XTAL activity. Adding or replacing circuit components and
retuning the oscillator will cure the problem.
For No RX
Suspect low XTAL activity for X1 on the RX TX unit. At Q1 add 7-12 pf bas
to emitter. At Q5 replace L5, 22 uh with a 15 uh choke, L40-1501-05.
Adjust TC1 for 42.6 MHz in RX.
For no TX
Suspect low XTAL activity for X2. At Q4 add 7-12 pf bas to emitter.
Replace L15, 22 uh with a 15 uh choke, L40-1501-05. Adjust TC2 for exact
146 MHz transmit frequency. At the base of Q4, also check L2 for
intermittent shorting against the Display unit mounting screw.
JEB/yn
(c) 21980TKC
Downloaded From P-80 International Information Systems 304-744-2253