Thank you so much, I found you message about 2200m version of QDX-M.
I will copy your winding data in this topic.
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Here is the list of inductors/capacitors I used.
QDX-M modifications for 2200m band, final version (2023 09 27)
LPF Filter design by Ross Ballantyne, VK1UN
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The components listed here refer to PCB Rev 5M
(document version 1.02 published 08-Feb-2023)
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Part Number?Toroid?Wire?Turns?Ind.uH?Function
T1?FT50A-75?24 AWG?20:(10+10)?? ? ? ?1200?? ? ? ?9V output transformer
T2?FT50A-75?28 AWG?40:40:40?? ? ? ? ? ? ? ? 4800?Trifilar
L4?T50-2?28 AWG?98?? ? ? ? ? ? ? ? 51.4?? ? ? ? LPFilter
L10?T50-2?28 AWG?101?? ? ? ? ? ? ? ? 57.9?? ? ? ? LPFilter
L12?FT37-75?24 AWG?9?? ? ? ? ? ? ? ? 180?? ? ? ? ?BPFilter
L14?FT37-75?24 AWG?30?? ? ? ? ? ? ? ? 1680?TX power choke
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C7?22 nF?Low Pass Filter
C11?2.88 nF?Low Pass Filter (2.2 + 0.68)
C14?44 nF?Low Pass Filter (22 + 22)
C20?22 nF?Low Pass Filter
C28?6.8 nF?Band Pass Filter
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All capacitors 100 Volt COG
One last thing, you need v1_10 of the QDX software installed, earlier versions have a bug preventing transmitting on 630 and 2200m.
Good luck,
Ian
VE6IXD
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