See Order Form for
prices.
Schematic Diagram (27K GIF)
For more info see the Application Notes.
Complete Kit Instructions (542K PDF)
EXPANDER 240
Electronic 6-position
Crystal Switch
The EXPANDER 240 has all the features of the EXPANDER 160, but without the oscillator function (not needed for many conversions) and now with 6 crystal positions. This saves you money and simplifies modifications in CB radios that don’t require an external oscillator signal. Examples: all 23-channel crystal-synthesized radios, Cobra 140/142GTL type, Cobra 148/2000/2010GTL type, Uniden Grant XL, etc. Other applicable PLL types include the CPI chassis, HD42851, LC7110, LC7113, M58472P, M58473P, MB8719, MB8734, MC145106, MSM5907, NIS7161A, NIS7264B, PLL02A, REC86345, SM5104, TC5080, TC9102, µPD858 (AM-only), and µPD861 (binary AM-only).
IMPORTANT
NOTES:
1. Due to the large number of crystal frequencies and mounting possibilities, the crystals
and the hardware switch are not included in either kit.
2. The following PLL circuits can’t be modified with these devices: C5121, LC7130,
LC7131, LC7132, LC7136, LC7137, LC7185, LC7232, LC7234, MB8733, SM5123A, SM5124A,
SM5125AM, SM5125B,TC9105, TC9106, TC9109, TC9119.
3. Installation should only be done by a qualified technician with access to the
radio’s service manual or schematic.
IF UNSURE WHICH KIT IS BEST FOR YOUR RADIO, SEND US A LARGE
STAMPED S.A.E OR EMAIL MESSAGE AND THE EXACT
RADIO MAKE AND MODEL.
SOLD ONLY AS PLANS + PC BOARD
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