IPN 220-01145-02
M850-00
T850 VCO PCB Information
E2.3
Copyright TEL 31/09/98
T850 VCO Parts List (IPN 220-01145-02)
How To Use This Parts List
The components listed in this parts list are divided into two main types: those with a circuit reference (e.g. C2, D1, R121, etc.) and
those without (miscellaneous and mechanical).
Those with a circuit reference are grouped in alphabetical order and then in numerical order within each group. Each component
entry comprises three or four columns: the circuit reference, variant (if applicable), IPN and description. A letter in the variant column
indicates that this is a variant component which is fitted only to the product type listed. Static sensitive devices are indicated by an (S)
at the start of the description column.
The miscellaneous and mechanical parts are listed in IPN order at the end of the parts list.
The Parts List Amendments box below lists component changes that took place after the parts list and diagrams in this section were
compiled. These changes (e.g. value changes, added/deleted components, etc.) are listed by circuit reference in alphanumeric order
and supersede the information given in the parts list or diagrams. Components without circuit references are listed in IPN order.
Parts List Amendments
*C1, C4, *C7
*C8, C10, C11
Rx mid/low/high: component values unchanged but tolerances changed to ±0.1p to ensure consistent low
noise performance from oscillators and to improve selectivity (710286, 710287, 710288).
C6 A length of 0.5mm tinned copper wire was soldered from the PCB via at the rear of the trimcap to the trimcap
body to improve selectivity and signal-to-noise ratio (9/98).
R6 Rx low: changed from 120Ω (IPN 036-13120-00) to 82Ω (IPN 036-12820-00) to reduce the VCO
noise floor (97/04-7078).
Rx mid/high: changed from 82Ω (IPN 036-12820-00) to 68Ω (IPN 036-12680-00) to ensure consistent
low noise performance from oscillators and to improve selectivity (710286, 710287).
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