Hybrid Cascode IF Amplifier
Project / Kitlet Info
Kitlet Contents:
If you ordered a kitlet, here's what you received:
Group Quantity Description Circuit Designator Notes 1 HYCAS-PCB Board-1 The Printed Circuit Board RESISTORS: 2 1K ohm 1/4W R1, R35 (These really are 1/4W Resistors, even if they look small). 2 1.5M ohm 1/4W R26, R27 1 18 ohm 1/4W R38 See discussion at W7ZOI.net. May have substituted 22 ohm resistor. 3 100 ohm 1/4W R10, R11, R16 1 100K ohm 1/4W R24 6 10K ohm 1/4W R19, R28, R29, R30, R31, R37 R37 is an addition. See discussion at W7ZOI.net. 4 180 ohm 1/4W R9, R13, R14, R20 3 2.2K ohm 1/4W R2, R25, R33 4 220 ohm 1/4W R8, R12, R17, R34 1 270 ohm 1/4W R6 2 3.0K ohm 1/4W R7,R15 Value changed to 3.0K for 9 MHz Input Match. 1 330 ohm 1/4W R36 1 4.7K ohm 1/4W R18 1 47K ohm 1/4W R23 1 51 Ohm 1/4W R3 2 680 ohm 1/4W R21,R22 1 5K Potentiometer R32 CAPACITORS: 7 0.01uF 50V C10, C11, C15, C3, C4, C5, C7 10 0.1uF 50V C12, C13, C14, C19, C20, C21, C22, C6, C8, C9 2 0.22uF 50V C17, C18 1 4.7uF 50V Electrolytic C16 1 65pf Trimmer Capacitor C2 INDUCTORS: 1 6.8uH RFC L1 See Notes. (These are brown and look kind-of like 1/2W resistors). 3 47uH RFC L2, L3, L4 See Notes. (These are green and look kind-of like 1/2W resistors) SEMICONDUCTORS: All semiconductors are delivered a separate anti-static bag. They were handled in a static-free environment, using a grounding pad and a wrist strap. Use whatever precautions you feel are necessary to avoid ESD damage to the parts. 9 1N4148 D1 - D9 6 2N3904 Q1, Q3, Q5, Q10, Q11, Q12 3 2N3906 Q7, Q8, Q9 3 J310 Q2, Q4, Q6 1 LM317L U1 Voltage Regulator TRANSFORMERS: 1 FB-43-2401 T1 Amidon ferrite bead (toroid). 2 feet #30 enamel wire T1 (wire) For winding your own transformer.
Missing any parts? Email me and I'll arrange a replacement.
Notes:
W7ZOI is maintaining a really good set of notes. Please check his web page for details. Item designators listed above should match with his designators, etc.
If for some reason you misplaced your original copy of QST magazine, the ARRL has graciously granted us permission to post a reprint of the article here. This should only be used if you misplaced, damaged or destroyed your QST magazine, or by chance if you accidentally let your ARRL membership lapse. Remember to check the errata page, as the changes will greatly improve the stability of the amplifier.
Please study the article, including the schematic, prior to placing your order for a kitlet. The Yahoo! group EMRFD is a great place to go, to discuss your progress and results with the amplifier stage.