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CHANGELOG.md

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Changelog

28/Jan/2022 - Revision R, Full & Lite

  • Designed larger pads for the Diodes and NCP553

14/Apr/2021 - Revision R, Full & Lite

  • Removed C6 - That's for DC blocking and no DC is present at this point
  • Removed R6, R9 - J310 chain connected directly to +9V lines, 2SC5086 connected directly to 3V line.
  • Cleared some lines away away from the PCB border, too close to PCB edge.

21/Feb/2021 - Revision Q, Full & Lite

  • Better Silk-Screen Pin 1 markings for Power regulators
  • Larger footprint for 2SC5086
  • Moving 0.1µF transistor caps away from RF section
  • Lots of re-routing
  • Changing 1000 pF decoupling caps to Low ESL type and 0805 footprint for better RF performance
  • Took advantage of J310 source & drain interchangeability and rerouted component for better placement and signal routing.
  • Labeled a few signals in Eagle file for better understanding of signal route/path
  • Changed two resistors in Amplifier stage for extra 0.3 dB gain - and updated BOM
  • Added ground pad
  • Larger ground exposed ground pad near at the screw
  • Changed pad for RF components to a rounded layout
  • Enlarged the RF wire signal, in order to reduce the internal signal impedance
  • Improved component silk screen, for better component placement cue (and get rid of manual silk cues)
  • Removed components from the board lid part, moved to larger board part

05/Jul/2020 - Revision P, Lite Version

  • Repositioned the SDR Out port to right above the DC block cap
  • Changed RF switch layout - now IF input uses the RF switch's RFC port instead of RF2 - The PE4259's RF{N} port gets in a grounded state instead of just reflecting out the data when the port is not selected/active. More details here
  • Got rid of the "Grounding" in RF1 port; that's not necessary because... Above
  • Because of that... One less component (the 4.7 nF C2 cap)
  • Few text corrections
  • Added test pads for 9V, 3V and RF Switch
  • A voltage line re-routed to the board edge, less ground plane disturbance

24/Nov/2019 - Lite Edition

  • This revision features the bare minimum of the panadapter board: The TX signal RF switch and the Amplifier
  • Greatly simplified and cheaper design
  • More gain (due to less insertion loss of the RF switch chain that existed in previous revisions)

02/Nov/2019 - Revision O

  • Board redesign
  • Moved everything to the bottom side of the board, except for a RF switch and SDR/Scope unit ports
  • Redesigned BPF (thanks to SM0AOM)
  • Changed panadapter default state from disabled to enabled
  • Changed RF front-end switch to use the TX9 signal instead of RX9
  • Added a PTC fuse
  • Choosed a simpler (and cheaper) 9V regulator

22/Jun/2019 - Revision N

  • Removed the 5V regulator
  • Removed the USB provisions
  • Removed the G4HUP LPF. Reasoning: Found it of no use, since it cuts the signal 24 MHz above the IF center frequency. Replaced with a selectable 3-MHz wide 69.450 MHz BPF.
  • Moved regulators to the top side of the board (to take advantage of heat dissipation)
  • Moved the SDR Out port to the top of the board
  • Added a large uncovered ground pad
  • Tried to group the signals as much as possible and moved everything to the top of the board
  • And thus, reduced significantly the BOM (35 to 25 different parts)

29/May/2019 - Revision M EXPERIMENTAL. In this revision:

  • Got rid of the USB receptacle - Too much space in a tight radio
  • Moved all GPIO pads to the upper board side
  • Added a few missing Pin 1 references
  • Renamed voltage regulators to somewhat shorter name
  • Small re-routing - 9V regulator was entangled with capacitor

24/May/2019 - Revision L EXPERIMENTAL. In this revision:

  • Added the ability to bypass entirely the amplifier and filters
    • Selectable by RF switch (default: off)
  • Added a 3-pole Chebyshev Band-pass Filter centered at 69.450 MHz, 3 MHz wide
    • Selectable by RF switch (default: off)
  • Revamped the Block Diagram
  • Added the BPF LT-SPICE simulation
  • Updated README, BOM, Gerbers and Pictures
  • And yes, board is getting somewhat cluttered.

19/May/2019 - Revision K

  • Changed footprints: BOM specifies 1206, project had 0805
    • Unified everything Resistors and Capacitors in 1206
    • Inductors are 0805
  • A few routing enhancements
  • Recalculated the component indexes
  • Updated BOM to reflect the new component index
    • And also found a unaccounted resistor, whoops.
    • Reviewed the entire BOM and circuits. Now everything should be fine.

18/May/2019 - Revision J

  • Changed SCPON signal to RX9
    • Added a Voltage Divider
  • Changed the SMA-to-U.FL cable
  • Added a few vias in large ground pads for voltage regulators
  • Moved USB port a bit back in PCB

07/Apr/2019 - Revision I

  • Created USB interconnection with the SDR
  • Proper power management: Three voltage regulators in the board (9V, 5V, 3.3V)
  • Power is only enabled with signaling coming from USB hub; otherwise, board quiesce
  • Updated BOM

29/Mar/2019 - Revision H

  • Revised routes in Cheb Filter - Made the tracks fatter and straighter
  • Repositioned Q2 for better signal routing
  • Better unit spelling in silk screen for resistors
  • Flipped IF/SCP ports
  • A few routing changes.

27/Mar/2019 - Revision G

  • Removed a lingering DC blocker capacitor in filter in after RF switch.
  • Added chokes in DC IN lines (3.3V and 5V) (yet another Gordon trick)

27/Mar/2019 - Revision F

  • Added 1 nF capacitors in RF lines in PE4529 (except RF2, goes with a 470 pF to GND)
  • Got rid of the VCC via which was crossing the RF line (argh)
  • Finally got the courage to change a bit the board layout and escape from the thin strip that I was working previously.
  • And another THANK YOU to Gordon AD5GG for his invaluable feedback

25/Mar/2019 - Revision E

  • Changed the switch from a analog one (was a SN74LVC1G66) to a RF one (now: PE4259) (thanks to Gordon Hudson AD5GG)
  • Now using 3.3V (because of PE4529)
  • The switch default state now grounds the SDR
  • Updated the list of contributors in PCB Silk Screen.

20/Mar/2019 - Revision D

  • Moved to OE2DOR amazing board design
  • Added provision for two external inputs for latching control (actuating on a RF switch), isolating the SDR receiver when the two inputs are not in HIGH state. This is a bit of overkill in FT-991/A, but I want to be able to control the IF tap by software and be able to unplug it completely when not in use, without having to open the radio ;-)

History (OE2DOR)

05/11/2018

  • Board Layout changed to fit neatly inside FT-991/A
  • Connection to IF using existing U.FL jumper cable
  • Connection to FT991A SCP-UNIT using additional short U.FL jumper cable
  • Connection to SDR/SpectrumAnalyser using new U.FL to SMA cable
  • Mounting using M3/10mm PCB Spacer soldered to head of existing PCB mounting screw (since PCB mounting screw has no metric thread)
  • Fixation using M3 Plastic nut & screw sticking into tuning hole of shielding box
  • All but one resitor (1206) changed to 0805 to allow for smaller PCB layout

History (G4HUP/W3AXL) Updated G4HUP / W3AXL panadapter tap Simple revision to the G4HUP high-impedance IF tap with specific components and updated filters.

12/14/2017

  • Revised parts.md to add quantity of parts needed.

12/10/2017

  • Up and running on a Yaesu FT-991/A

12/10/2017

  • Revised component values to values that you can actually obtain. Added digikey parts list.

10/22/2017

  • Second revision testing complete and satisfactory. Up and running on a Yaesu FT-450D

08/30/2017

  • Schematic revised to fix capacitor placement error in original schematic. New boards sent out for fabrication and testing will be done when they get back.