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STM8L-FOX_2m_PA_V6_1

11 months ago 111
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  • BOM
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Description

Power amplifier v6.1 for ARDF 2m fox

Schematics and a PCB for Amateur Radio Direction Finding (ARDF) fox power amplifier for 144 MHz (2m) band. Largely based on ideas taken from DF1FO, PE1GRL and PE5EDW designs.

The PA is powered from the CNTL board. To meet the constant RF output power it uses boost switching power converter.

The RF stages are:

  • Si5351A RF oscillator
  • 2SK3078 PA driver
  • RQA0011 final stage
  • 146 MHz Low Pass Filter

The Amplitude Modulation is achieved by directly modulating the PA driver gate bias from the controller DAC. The linearity is quite acceptable and is much better than switching the bias by square-wave signal. The linearity of resulting modulated RF signal can be theoretically improved by issuing pre-distortion in the MCU code.

Documents

FOX_2m_PA_SCH_V6_2

FOX_2m_PA_PCB_V6_2

BOM

ID Name Designator Footprint Quantity
1 NTC X7 HDR-1X2/2.54 1
2 ANT CN1 PH-2P-2.54 1
3 MOUNT-PAD-ROUND3.0 H1,H2,H3,H4 3,0-PAD 4
4 1uH L1 IND_3L_SNR5040K_SERIES 1
5 15pF C15 1206 1
6 100n C12 1206 1
7 10n C3,C36 1206 2
8 1n C6,C7,C13,C8 1206 4
9 100p C10 0805 1
10 1u C14 0805 1
11 *100p C18 0805 1
12 10p C1 1206 1
13 22 C31 1206 1
14 56 C32 1206 1
15 * C33 1206 1
16 1u C17 1206 1
17 10u C37 1206 1
18 Si5351A-A-GT U1 MSOP10 1
19 1uH L2 1210 1
20 RQA0011DNS Q2 HWSON-2 1
21 25Mhz Y1 SMD-3225_4P 1
22 8.2nH L8 1210 1
23 33pF C19,C20,C21,C22,C23,C24 1206 6
24 TPS61236PRWLR U4 VQFN-9_2.5X2.5 1
25 64nH L5 L-SMD-0.4X2.5X7T 1
26 Header-Male-2.54_2x5 X4 HDR-5X2/2.54 1
27 10uF C26 0805 1
28 2SK3078A Q1 SC-62 1
29 68k R2 1206 1
30 47k R3 1206 1
31 27k R5 1206 1
32 100k R6 1206 1
33 10k R10,R11,R8 1206 3
34 *51 R12 1206 1
35 200k R13 1206 1
36 1M R14,R9 1206 2
37 100 R1 1206 1
38 0 R7 R0805 1
39 *36p (DNF) C34 C1206 1
40 DNF C16 C1206 1
41 47uF C30,C11 1206 2
42 22u C29 0805 1
43 27nH L3 L-SMD-2.4X1.65X1.45 1
44 Header-Male-2.54_2x10 X2 HDR-10X2/2.54 1
45 10u C27,C28 0603 2
46 470 R4 1206 1
47 *220p C5 C1206 1
48 15p C9 C1206 1
49 10p C2 0805 1
50 TD9517ATR U5 SOT-23-5 1
51 56nH L9,L10,L11 L-SMD-0.4X2.5X6T 3
52 MMBT3904LT3G Q3 SOT-23(SOT-23-3) 1
53 4.1nH L7 L-SMD-2.9X2.54X2.03 1
54 *1000p C35 C1206 1

Attachments

Filename Download
2SK3078A_SC_01.txt
2SK3078_SC_02.txt

Members

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