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Some L1 pictures?

[email protected]
 

All,

???? I have a 80M and a 40M QCX on the way.? The description of how to wind the "long" section confuses me slightly. Do you: "scramble" the windings as you progress along the length of the winding...wind to the end of the allotted space, then just pile the rest of the windings near that end...wind to the end of the space, then scramble the remainder over the entire area of the winding...???

Does anyone have a picture of their final result to illustrate a functional method?

Or, I was thinking of using smaller diameter wire and making it a typical single winding (only for that winding, the other 3 would stay their original size).? Would that lower the Q enough to degrade performance at all?? The PITA factor of using very fine wire is less of an issue to me than a performance hit.? Opinions?

Bill
W2EB?
 

Bill

K8IQY (Jim Kortge!) was kind enough to post a photo of his 80m QCX T1 wound with #30 AWG wire

/g/QRPLabs/message/17717?p=,,,20,0,0,0::Created,,k8iqy,20,2,0,6265682
 

On 11/30/2017 10:56 AM, Russ@va3rr via Groups.Io wrote:
Bill

K8IQY (Jim Kortge!) was kind enough to post a photo of his 80m QCX T1 wound with #30 AWG wire

/g/QRPLabs/message/17717?p=,,,20,0,0,0::Created,,k8iqy,20,2,0,6265682
And I have purchased some #34 wire with the thought of redoing T1 for my 80-Meter rig.? I suspect the change in wire size has little effect on performance, although, I've not measured it.? It took about 4 feet of #32 to wind it and less with #34, but I don't know the length at the moment.? I have more? photos that I can post of my T1 windings if someone would like to see them.

72,

Jim, K8IQY
[email protected]
 

Jim,

???? As far as you can tell, did using a smaller diameter wire change the number of turns at all?? I'd rather not have to desolder the primary to add or remove turns.

Bill
W2EB
 

On 11/30/2017 11:16 AM, w2eb@... wrote:
Jim,
Hi Bill,


???? As far as you can tell, did using a smaller diameter wire change the number of turns at all?
No.? I used the specified turns and the trimmer capacitor tunes the inductor just about in the middle of the plate closure.? If I had had the #34 wire when I wound it, I would have used it instead of the #32 that I had on hand.

? I'd rather not have to desolder the primary to add or remove turns.
I don't think you will if you do an accurate wind/count.


Bill
W2EB
72,

Jim, K8IQY
 

Yes, I would also like to see as many 80 meter T1 windings as I can get!? Greatly appreciate this as I can't seem to wrap my head around how to do this properly.? My 80 meter OCX has not even been shipped yet but I like to be prepared.
Tnx Jim
--
de K2TL.. since 1964
 

The LPF-modules have the same requirement, the lower frequency models will not have a neat single layer winding.
630m was a messy one and required a bit more planning and keeping track on how far on the core you're supposed to be at the current turn. Drawing a small guide with ~5 divisions of the turns to indicate at which position you need to be on is helpful.
For example, you wind 3 turns and then the 4'th one back on top of the previous 3, and continue forward. You'll see that the inner part of the core is more cramped than the outside, so winding a turn back on top of the last ones when you feel that it is progressing too far. Laying down the turns so that the inside is wound back on top of the previous ones and on the outside where there's more room you can wind them in a continuous way, looks like they cross each other.
Quick 'n dirty sketch with mspaint on a screendump from the QCX assembly manual + my 630m lpf attached.
 

Bill-

My 40m T1.?

Red wire is #30. No C5 and 42 turns.
Green wire is #26
I messed up the first T1. Next time I'll use a sharpie marker and color the wire that comes in the kit to make it easy to tell which coil is which when it comes time to solder them. A little glue helped a lot.

The only other difficulty I had with the kit was adjusting the three pots. It took a few minutes to realize that the volume control can't be wide open when looking for a dip :-)


Here is a photo.
 

Here's a grainy pic of my 60m T1 transformer.? Thanks to W0VT for the 30awg magnet wire.

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