Doing some repairs on the QMX I inadvertently used the winding instructions from V2 instead of V1...

 

23 windings with a 15T tap  as opposed to 28 windings and a 19T tap. I didnt realize until I went to check continuity per the v2 manual and had nothing---it still checks out with the V1 instructions, however. 

 

Easy to change--but wondered if this was a better design subject to the other additions on the board must have had.

Happy New Year to All

 

Scott VY1CO

No problem Charles...glad it worked out!

 

I know the L401 winding question has been beaten to death, but I haven't quite found the differences between version boards...

 

Anyway, all the best for the new year.

 

Scott VY1CO

Scott,

See the description at this link, which is on the QMX page regarding a fix to a 20m receive sensitivity issue:

To take proper advantage of the new windings, you should also make the described change to the band configuration.

Stan KC7XE

thank you for the link Stan...73

 

S

The difference between the V1 and V2 circuits seems to be that the V1 circuit uses both of the multiplexers in IC402 while  the V2 circuit only uses one multiplexer. This doesn't seem to be the same as the 20m fix, this is implemented in both but with different numbers of turns on L401  Could the change to the multiplexer circuit means that different inductances are required?

 

Chris, G5CTH

Thanks Chris--I really dont know, but since it is now mounted as detailed in the rev2 instructions, --albeit on a rev1 board,   I am going to leave as is. Once my pwr supply boards arrive, and if i am able to bring it back to life, I will try it out first. If needed I can change down the road. Following the whole L401 saga is quite a read and it takes a lot of attention to follow the whole story.

 

Even the photographs had me scratching my head as it appeared the wires would come over the top at the tapped areas which was physicially impossible to do, but appeared that way in the photo. The top down photos are very clear but without a bit of angle they lack the perspective to tell whats going on...minor issues in the big scheme of things. I am enjoying every aspect of this little rig--even the troubleshooting. HNY.

 

Scott vy1co