T507
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Well at the risk of looking foolish I need to ask about this bino. I've wound a few of these in other projects but never been certain I was doing it right.?
I've wound T507 opposite handed. That is started both secondaries from the bottom and then outward. Is this correct or should I have started from opposite ends? OR does it not matter? Not sure why I can't work this out and searching just seems to lead to controversy. Thanks -- Phill EA5JHA |
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Phil. Just start by going in at on end of the hole going through the bino and finish coming out of the other end. Bring the wire straight out of the bino then bend it down and through the appropriate hole. Don¡¯t cross any of the wire ends under the bino to terminate on the opposite end. Terminate them on the end where they enter and leave the hole in the bino.? Ron On Thu, May 30, 2024 at 11:34 Phill via <rocinante2021=[email protected]> wrote: Well at the risk of looking foolish I need to ask about this bino. I've wound a few of these in other projects but never been certain I was doing it right.? |
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Steve, I think that when you wind the separate halves of a binocular core the only way to get the winding backwards is to cross the two ends of the wire over to the opposite hole farthest from the binocular hole they come out of. The winding sense will always be the same when you wind through the hole and around the outside of the core and back into the hole.? Ron On Thu, May 30, 2024 at 13:43 Steven Dick, K1RF via <sbdick=[email protected]> wrote:
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Thank you, Gentlemen.?
I'm still not clear but that says a lot more about my failings than your explanations. If I lay the binocular flat on the bench with the holes pointing towards me it seems there are two ways to wind it. 1. Start both windings at the end nearest me, pass through and turn both outward, away from each other, Back towards me and then back in at the bottom. The right hand "tube" is therefore wound clockwise whilst the lefthand is wound anticlockwise. 2. Wind the righthand tube as above but start the lefthand tube from the other end. In this case both are wound clockwise. I know I might be over thinking this but in the first case the magnetic fields will be opposite whilst in the second they are aligned.? I appreciate Hans might have allowed for this on the pcb so my question, before I solder it in is still which way should I wind it?? Kind regards PS I know, I should have done EE not Chemistry!!! -- Phill EA5JHA |
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According to the picture in the manual, it looks like you start the right side by winding at the bottom and moving up, and the left side by starting at the top and moving down.? In other words they are both wound anti-clockwise as looking at them from the same end.? I'll need to figure this out soon, too!? :-)
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I think you are correct about the photo, which makes me suspect that, at least for the QMX, this issue is a bit of a nothingburger. I purposely wound my MB QMX starting from the top and making my way down the side, so one the right side is anti-clockwise, and the left, clockwise.
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My SWR sweeps are fine, except up around 10 metres. I will wind my next QMX per the photo and report back in a few weeks. Having said that, I plan to use #22 AWG teflon-insulated wire for the single-turn primary for this build, as I did for my QRP Guys meter, which is wound the same direction as my QMX... vy 72 de Russ, va3rr On Fri, May 31, 2024 at 09:13 AM, Dj Merrill wrote:
According to the picture in the manual, it looks like you start the right side |
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Hi Phil, Start winding the hole on the right using the winding step used for winding L401. ? When that is done then rotate the bino 180 degrees so the left hole is now on the right. ?Then wind what was the left hole in the same way as the previous hole. ? By doing this both sides of the bino are wound in the same direction, counter clockwise. ?I will be giving it a go shortly. |
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Hi All,
I am ready to wind my QMX T507 at this time.? This discussion is coming in handy because I was curious about how to handle this one. This is my take on winding the bino.? Position the bino as seen in the picture and wind the right side first using the method shown for winding L401, once that side is wound then rotate the bino 180 degrees so the empty left hole is now on the right and then wind that hole using the same method used for L401.? If you rotate the picture 180 degrees it appears that's was what was done.? Hope I am not off base. Ed KN6NZW |
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Hi All,?
Many thanks for the advice. Ed, I wound mine with both starting from the bottom. The linked diagram is the same as a QRPGuys on I found. As said on this thread they are the same. My comment of over-thinking has been confirmed more than once. ;-)) BUT there is a physical difference between "our" windings. Considering just one end of the bino mine both wind up the side and on yours one winds bottom up and one top down! Does it make a difference?? I'll find out this week when I finally clean up some poor soldering on some of the coils and if? I dare connect some power. 73 -- Phill EA5JHA |
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Hi, I am not sure this is a true, but winding in opposite direction reduces parasitic inductance. But in general winding both wires from bottom or left from bottom and right from top does not matter. Thus, It might be very small increasing in correctness (probably a not noticeable) in case of starting winding both wires from bottom. I also tried to use rg316 coax with shielding to lower SWR on upper bands (I have 1.2) but got the same results as without shielding. Even factory transceivers use simple unprotected wire or even single core SWR meter. The only piece of advice from my side to use RG58 internal (central) wire with insulation to keep wires directly in the middle of binocular holes (see attached photo). =) |
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So I purposely wound the T507 stockton bridge in the same direction on my 2nd QMX build. The other difference is that I inserted some teflon tubing onto the one turn primary. On all the bands, the SWR readings are comparable. On 15M, both exhibit an SWR spike around 10 metres, but I feel the teflon may have improved that. It is immaterial as both my QMXs are mid-band units. And for the eagle eyed amongst you, the 10th turn is hiding below the circuit board in the photo - I checked more than a few times - lol
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72 de va3rr On Fri, May 31, 2024 at 09:37 AM, va3rr wrote:
My SWR sweeps are fine, except up around 10 metres. I will wind my next QMX |
Phill
Ronald Taylor
Dj Merrill
va3rr
Ed KN6NZW
Yury SP2RM