MCS2000: Difference between revisions
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====Sensitivity Issues==== | ====Sensitivity Issues==== | ||
If you notice poor sensitivity, noisy RX, or other receive issues, try opening the radio and tightening the screws holding the boards to the chassis. In some cases the boards will loosen to the point where they do not make good contact with the metal body, reducing the RFI shielding ability and increasing noise in the receiver. | If you notice poor sensitivity, noisy RX, or other receive issues, try opening the radio and tightening the screws holding the boards to the chassis. In some cases the boards will loosen to the point where they do not make good contact with the metal body, reducing the RFI shielding ability and increasing noise in the receiver. | ||
====VHF Preamplifier Conversion==== | |||
Originally, the MCS2000 VHF RX section was offered in two flavors, "normal" and "preamplifier." Those wishing to switch to the higher-gain (and possibly more sensitive) preamplifier version need only to make a few small component changes to the receiver board. The following table and figures are pulled from the MCS2000 VHF detailed service manual. | |||
{| class="wikitable" | |||
!'''Component'''||'''Value''' | |||
|- | |||
|colspan="2" style="text-align:center;font-size:12px;"|Remove | |||
|- | |||
|L3405||39nH | |||
|- | |||
|C3309||8.2pF | |||
|- | |||
|colspan="2" style="text-align:center;font-size:12px;"|Add | |||
|- | |||
|C3310||220pF | |||
|- | |||
|R3357||43Ω | |||
|- | |||
|R3359||10Ω | |||
|- | |||
|R3361||20Ω | |||
|- | |||
|R3405||1500Ω | |||
|- | |||
|R3407||0Ω | |||
|- | |||
|R3420||0Ω | |||
|} | |||
[[File:Mcs2000-preamp-board-mods.png|720px]] | |||
Revision as of 11:22, 19 April 2020
The MCS2000 is a single-band analog-only mobile radio, colloquially part of the Jedi series of radios.
Hardware
Sensitivity Issues
If you notice poor sensitivity, noisy RX, or other receive issues, try opening the radio and tightening the screws holding the boards to the chassis. In some cases the boards will loosen to the point where they do not make good contact with the metal body, reducing the RFI shielding ability and increasing noise in the receiver.
VHF Preamplifier Conversion
Originally, the MCS2000 VHF RX section was offered in two flavors, "normal" and "preamplifier." Those wishing to switch to the higher-gain (and possibly more sensitive) preamplifier version need only to make a few small component changes to the receiver board. The following table and figures are pulled from the MCS2000 VHF detailed service manual.
| Component | Value |
|---|---|
| Remove | |
| L3405 | 39nH |
| C3309 | 8.2pF |
| Add | |
| C3310 | 220pF |
| R3357 | 43Ω |
| R3359 | 10Ω |
| R3361 | 20Ω |
| R3405 | 1500Ω |
| R3407 | 0Ω |
| R3420 | 0Ω |
