Coil former for V quad

[troll5]

G-day all' I am in the process of building a v-quad based on the Maco VQ2 Quad instruction manual. I have come to a halt as I am unsure as to the length of the coil former.
Does anyone have a rough idea or an accurate size as to what it could be? This is the only part that is holding me up.
Any help would be greatly appreciated. Cheers from way down under.

 

[Captain Kilowatt]

From the manual it says it is 3/4 inch in diameter and from the looks of it in pictures and estimating it's length I would say it is about 2 inches in total length. It's not going to be that critical anyway,a little bit one way or the other won't matter. Just make sure it's 3/4 inch diameter and make three full turns as the instruction says and you should be good. I just don't understand why they use it to tune the reflector anyway. A better idea would be to simply make it a bit longer.

 

[troll5]

I'm with you on that one capt'n.Have tried to source the info as to why they have a coil on the reflector side but no luck. If it didn't need it why put it in, it must serve a purpose

cheers from downunder, Norm

 

[BOOTY MONSTER]

http://www.macoantennas.net/assembly/support2/Assembly_V-Quad.pdf

im guessing the coil is to ad length to the reflector since reflectors need to be longer than the driver element , and each additional reflector need to be longer than the preceding reflector .
on the pdf link above page 4 describes the coil install .

 

[troll5]

After all the advice I could gather I think I will add 5% to the reflector length and not use a coil former. Cheers Norm

 

[CDX-007]

After all the advice I could gather I think I will add 5% to the reflector length and not use a coil former. Cheers Norm

I never figured out why they used one but it could have something to do with the fact I've heard this V-Quad design (Delta loop) puts voltage & current in phase and have the nodes/ maxims centered on the wire...???

Would you like me to go measure mine?

 

[troll5]

CDX-007
That would be really appreciated if you could.

Regards Norm

 

[CDX-007]

CDX-007
That would be really appreciated if you could.

Regards Norm

Hey Norm,

'Nao woorrees', I'll measure it when I get home tomorrow, am visiting a friend tonight and playing computer while she's showering.

...I know, I know, What am I doing on the computer... you don't have to say it!

I hope you appreciate this assistance enough to listen for me on L38 / 10m so we can try it out in the future!

Catch you within 24h.

73

 

[troll5]

When I get her up I will point it straight at you and fingers crossed we might meet up

 

[CDX-007]

Hi Norm,
OK, I measured what I could but there's some sort of double rubberized cover which doesn't want to open and all I could do is try to figure out the number of turns with my thumbnail. First the coil is about 1 1/8" in diameter, and it appears to have only about 3 turns. The entire affair is 1.25" dia x 3.375" long.

I doubt it is super critical so fudge it and tune for best performance and it will serve you well!

I may be done with my SGM testing in a week or so and have it installed in the tree so I should hopefully be able to get on installing my V-Quad too. I would hope you & I will be in QSO within a month!

73 and I hope that inspired ballpark guesstimate helps!

 

[troll5]

Thanks mate, I'm on the way out back to start putting it all together. Hopefully it all work and I can get good QSO's going.
Once again I really appreciate the time and effort
Cheers Norm

 

[CDX-007]

Thanks mate, I'm on the way out back to start putting it all together. Hopefully it all work and I can get good QSO's going.
Once again I really appreciate the time and effort
Cheers Norm

Right-o!

Say Yolida,
Scott

 

[troll5]

CDX-007
Being a dumb ass aussie I forgot about the gamma match. Would you be able to get some measurements for me :redface: :redface:

Cheers Norm

 

[CDX-007]

Can do. I'll measure and post them later this afternoon, if that's alright.

 

[jazzsinger]

...I know, I know, What am I doing on the computer... you don't have to say it!


73

i guess we've just found another area where that magic 6.5" has failed to impress, we might have to start calling your ladyfriend, miss unimpressed at .64