Ramsey Electronics FT146 manual Note On Replacement Parts

NOTE ON REPLACEMENT PARTS:

If you lose or damage parts during assembly or testing, you may, of course, order any needed replacement parts by writing or faxing the Ramsey Electronics, Inc. factory. Some of the more common parts may also be picked up at Radio Shack or other local parts distributors. Use EXACT values when replacing parts. The following is a general guide to obtaining parts for your transceiver as quickly as possible:

[A]: Radio Shack or local electronic parts distributor: Resistors, electrolytic capacitors, disc capacitors, common NPN or PNP transistors, zener diodes, switching diodes, hookup wire, LED, controls, antenna and microphone connectors.

[B]: Order from RAMSEY ELECTRONICS: Most RF and VHF transistors, coils, crystals, PIN diodes, varactor diodes, trimmers, IC chips.

[C]: U1 is a common dual op-amp made by many manufacturers and is commonly stocked by most parts stores. There are also acceptable "standard replacements" for some of the semiconductors used in the transmitter. "SK" and "ECG" standard replacements are stocked by local electronics parts distributors or may be ordered through a Radio Shack store. The following chart should help you make the most cost-effective choice if replacement semiconductors are needed. Performance of your transmitter will, in most cases, not be up to full spec if you decide to use a relacement device, but will get you by in a pinch.

Part ID	Type	Recommended source
		RE=Ramsey, RS=Radio Shack
Q1, etc.	2N3904	RS 276-1617
Q12,13,14	PNP 221334	RS276-1604 or 2N3906
Q2, etc.	2SC2498	ECG10, SK9139, 2N5179, or RE
Q3	NE021	MRF901 or RE
Q9	2N3866	ECG311, SK3195 or RE
Q8	SD1127	MRF237, ECG341, SK9617 or RE
D	1N4148	1N914, RS276-1620 (pack of 50)
D3,D23	BB505	RE
D18	1N4002	RS276-1102, 1N4003
D11,D12	6.2 V zener	RS276-561
U1	LM358	ECG928, SK3691 or RE

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