Ramsey Electronics FT146 - Manual (Page 25)

FT146 • 25
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