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PCB- QRM Eliminator

1 year ago 1756
  • Description
  • Documents
  • BOM
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Description

QRM Eliminator based on design by RA0SMS and tested by Z32U.

This has been built on breadboard and tested (10 May 2020)

PCBs ordered this version has one error on the board around the RF sense capactitor and the tracks are a bit close for 100W around the relay otherwise OK.

Documents

Combined Eliminator+RF Sensing Controller copy

Second Attempt PRE GND PL

Second Attempt

Third Attempt

BOM

ID Name Designator Footprint Quantity
1 10nf C40,C25,C41,C32 2.5MM CERAMIC CAP 4
2 680pF C39,C42,C28 2.5MM CERAMIC CAP 3
3 100nf C46,C43 2.5MM CERAMIC CAP 2
4 BC549CG Q14 BC547 1
5 47uF C38 B_CAP_ELECTROLYTIC_5.08MM 1
6 1N4148 D19,D6,D11,D18,D20,D14,D15,D17 DIODE_DO-41_SOD81_VERTICAL_ANODEUP 8
7 IRF520 N-CHANNEL Q12 221A-06 1
8 68.1K R25,R26 0.25W-RESISTOR-VERTICAL 2
9 33u C44 B_CAP_ELECTROLYTIC_5.08MM 1
10 BC547BTA Q8 TO-92-3_L4.8-W3.7-P2.54-L 1
11 RF-ENABLED JP2 JUMPER2 1
12 1K R36,R32,R31,R28,R19,R27 0.25W-RESISTOR-VERTICAL 6
13 100K R16 0.25W-RESISTOR-VERTICAL 1
14 3k3 R40,R20 0.25W-RESISTOR-VERTICAL 2
15 10K R22 0.25W-RESISTOR-VERTICAL 1
16 J113 Q9,Q10,Q11 TO-92-3_L4.9-W3.7-P1.27-L 3
17 100pf C36,C35,C34 2.5MM CERAMIC CAP 3
18 1nf C37,C31 2.5MM CERAMIC CAP 2
19 10pf C26,C29,C27 2.5MM CERAMIC CAP 3
20 1:10 T2 TORROIDAL CORE JOULE THEIF 1
21 30K R47 POTENTIOMETER_TRIMMER_VISHAYSPECTROL_ECONTRIM-TYPE36M 1
22 P-CHANNEL Q7 TO-220-3_L10.0-W4.5-P2.54-L 1
23 1mH L2 NEOSID_INDUCTOR_MA-BS75 1
24 1n1008 D24 DIODE_DO-41_SOD81_VERTICAL_ANODEUP 1
25 1n4148 D23 DIODE_DO-41_SOD81_VERTICAL_ANODEUP 1
26 1K R45,R48,R44,R46 0.25W-RESISTOR-VERTICAL 4
27 10K R43 0.25W-RESISTOR-VERTICAL 1
28 100K R49 0.25W-RESISTOR-VERTICAL 1
29 100k R39 0.25W-RESISTOR-VERTICAL 1
30 G2R-2-12VDC RELAY2 RELAY-TH_G2R-2 1
31 1K R18,R21 RES-TH_RK09K1110A0J 2
32 5K R23,R24 RES-TH_RK09K1110A0J 2
33 U7 RX JUMPER2 1
34 Power LED PWRLED,LOW-Z,HI-Z JUMPER2 3
35 TX LED TXLED JUMPER2 1
36 ANTENNA ANT JUMPER2 1
37 PTT PTT JUMPER2 1
38 Power PWR JUMPER2 1
39 1nF C33 2.5MM CERAMIC CAP 1
40 10nf C24 2.5MM CERAMIC CAP 1
41 100pf C30 2.5MM CERAMIC CAP 1
42 100pf C45 2.5MM CERAMIC CAP 1
43 LM393 U1 DIP-8_L9.4-W6.4-P2.54-LS9.1-BL 1

Attachments

Filename Download
Build Notes Version 1 (Updated Nov 2020).pdf
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Comments (1)

garethdavies Reply

Testing Procedure to check all OK before boxing. Optional.
Step 1: Visual inspection, does it look OK?
Step 2: Apply Power and check for Red and Green Light. The unit should be protected against
reverse polarity, but don’t count on it.
Step 3: Attach Scope to RX Output Pin and Signal source 2Mhz 0.1V to Antenna Connection
Varying the main system gain and antenna gain (1K Pots) should result in varying amplified
output. The system may clip at high gain values with such a large input signal, this is normal.
Step 4: Attach Scope to RX Output Pin and Signal source 2Mhz 0.1V to Low Z noise Antenna
connection, set main system gain to provide 0.5V P‐P output. Vary the phase and gain pots for
Noise antenna (5K POTS). Changing output should be observed.
Step 5: Manually short the PTT manual connector, green light should go out
Step 6: Connect signal generator to RX output (to simulate rf from transmitter). Connect RF
sensor circuit select jumper. Set Signal generator for 0.55V P‐P. Adjust potentiometer until green
light goes out. Reduce input signal to 0.4V and the light should re‐illuminate after short delay. Recheck
that the system responds to RF at 0.55V.
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