A place to exchange information about parts and kits supplied by http://kitsandparts.com
You are not logged in.
I started on my 40m LPF the other day. I've been using my new LC meter, and getting use to it. Anyway...after winding the toroids I cut off excess length on two, and then found them to have a lower inductance due to making an incorrect adjustment based on an erroneous reading I took.
What gauge of wire is used for these toroids so that I can buy a roll locally?
This is an educated guess by comparing the left over wire from my LPF and comparing it to other labeled wire that I have. Plus looking at what Diz sells on his website http://kitsandparts.com/magnetwire.htm and seeing that the #28 wire is not heat stripable as is the wire that comes with the LPF kit, I would say it is #28 . I think anything around that guage is going to be fine since you are measuring it anyway.
28 will work for most of the home projects. Did you get a LCII meter? I love mine. I find on a lot of toroids I need 1 turn less than stated to get the values listed.
Thanks Tom and Leonard,
Hopefully I will find some heat stripable #28 wire at the shop up the road.
No I didn't buy an LCII. I considered it awhile ago and then Silicon Chip Magazine in Australia put out a kit based on the LCII design. This re peaked my interesting in getting back to the kits. They appear very similar in specifications although I have not looked at the LCII construction manual to review it's circuit diagram.
Out of interest Leonard, is the LCII effected by hand capacitance? I've noticed that if I place my palm close to where the internal oscillator is the stray inductance reading will spike. The strays also go up and down by about 10nH-30nH but go away after I zero it a few times in say 5 minutes. I'm confident I'm getting repeatable results now that I've gotten use to it over the last few days.
http://www.altronics.com.au/index.asp?a … p;id=K2533
Yes, from the few toroids I've wound since having the LC meter I too have observed that I need 1 turn less, or there abouts.
N2PK VNA scan of the 40 meter LPF. Looks good.