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Re: #qmx+ #qmx #qdx Documentation updates #qmx #qdx

 

Hi Dale

You might not need the revised manual anyway, if your kit comes with T37-6 toroids. Anyway:

QMX+?
  • Edit to the parts list to?reflect the fact that four of the toroids might be T37-10 or T37-6
  • I changed pages 29 to 31 inclusive, which is section 2.11, to reflect the instructions?for winding if you have a T37-10 toroid for L403.?
  • I amended page 32 to include a note that T37-10 toroids may be supplied and also the winding details for those toroids.?
  • Page 33 is a new page completely which shows a new diagram for the T37-10 version of the LPFs with the turns count.?
  • I made notes in a couple of other places about the FT37-43 being a dull black and the T37-10 being shiny black and NOT to mix them up
  • I made some edits to the part of the manual about firmware?updates since?for Rev 2 PCBs it is no longer correct to say that the board comes with no firmware installed.?
QMX (only 60-15m version is affected)
  • Amendment to parts list notes the possibility of black shiny T37-10 toroids being supplied
  • Some notes in a couple of other places about the FT37-43 being a dull black and the T37-10 being shiny black and NOT to mix them up
  • Pages 38-40 inclusive are updated to include turns count details?for both the yellow T37-6 case, and the black T37-10 situation.?
QDX (only affects 80-20m version)
  • Page 11: Amendment to parts list notes the possibility of black shiny T37-10 toroids being supplied
  • Page 29: A whole new page that shows the turns counts in table and diagram format for the T37-10 toroids
  • Again a couple of notes about NOT mixing up with the dull matt black FT37-43 toroids
The substitution of T37-10 for T37-6 won't cause any performance differences; and the permeability is almost the same, just a turn or couple of turns more are required on the T37-10 for the same inductance. We tested all the builds using T37-10 and they all worked great. No issues.?

A big thing to watch out for is not mixing up the FT37-43 and T37-10, being the same size, and both being black; but really the appearance is quite different, the FT37-43 has a more angular square-ish cross-section, whereas the T37-10 is much more smooth and rounded if you consider it's cross-section.?

73 Hans G0UPL



On Fri, Jan 3, 2025 at 5:30?PM Dale Hardin KS4NS via <joe.dale.hardin=[email protected]> wrote:

Could you list the pages that changed so those of us awaiting our QMX+ delivery can update our assembly manuals?? I already printed out the assembly manual to read while awaiting delivery.


On Fri, Jan 3, 2025, 8:01 AM Hans Summers via <hans.summers=[email protected]> wrote:
Hi all

Since T37-6 (yellow) toroids suddenly got scarce, some new batches of QDX 80-20m, QMX 60-15m and QMX+ are now being supplied with some T37-10 (shiny black) toroids. I have updated the QDX, QMX and QMX+ manuals to reflect this.?

73 Hans G0UPL


--
Dale Hardin
KS4NS
Elberta, AL
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