I expected you to say that if you connect the variable capacitor is series it doubles the voltage rating of the capacitor, making it useful for QRP transmitting in addition to what you did say in the video, (Those little transistor radio caps don't handle much voltage). The distinction between the 2 ways a vari cap can be wired for total, or 25% capacitance, and regular or double voltage handling capability may be useful to those not already aware of using air variable caps for transmit as well as receive. I use one of those on my bicycle wheel mag loop antenna for 11 meters (CB). I don't know what it's power limit is yet. Do you know how much power those plastic vari caps can take?
This is also true. I don't know the voltage ratings of plastic dielectric capacitors but they would be the worst possible choice in a transmitting loop.
Hi from Turkey..I need some help please..I have a variable..I connected all the corners..and now it is 35-330 pf ..but I need less the 35..minimal capacitance must be 10 for example..what can I do for this ?
Get a capacitance meter and try all different combinations - you may find a combination that gives a more useful range if your capacitor has two capacitors that can be connected in series. Or you may not and will need a different variable capacitor.
@@vk3ye ok so I've got this antenna cross I built with copper wiring wrapped around it (equal distance apart of course). Do I now solder the two ends of the copper to the middle and left leg on the capacitor for an AM signal? Thanks
When you combine the middle pin with the left pin the values are a wider range. Then moving the lead from the left pin to the right pin and checking the range gives a lower range result. I understand because there are 2 varicapacitors, but when you measure from left pin and right pin, omitting the middle pin, the values a greatly diminished to a lower range. Why?
The lower capacitance is because the two variable capacitors are in series. Sometimes used to advantage by magnetic loop antenna builders but rarely in other projects.
how can i use this capacitor in my breadboard it is not proper for my breadboad. can i make it proper by making jumpers soldered to pins??
Yes
I expected you to say that if you connect the variable capacitor is series it doubles the voltage rating of the capacitor, making it useful for QRP transmitting in addition to what you did say in the video, (Those little transistor radio caps don't handle much voltage). The distinction between the 2 ways a vari cap can be wired for total, or 25% capacitance, and regular or double voltage handling capability may be useful to those not already aware of using air variable caps for transmit as well as receive. I use one of those on my bicycle wheel mag loop antenna for 11 meters (CB). I don't know what it's power limit is yet. Do you know how much power those plastic vari caps can take?
This is also true. I don't know the voltage ratings of plastic dielectric capacitors but they would be the worst possible choice in a transmitting loop.
Hi from Turkey..I need some help please..I have a variable..I connected all the corners..and now it is 35-330 pf ..but I need less the 35..minimal capacitance must be 10 for example..what can I do for this ?
Get a capacitance meter and try all different combinations - you may find a combination that gives a more useful range if your capacitor has two capacitors that can be connected in series. Or you may not and will need a different variable capacitor.
How to I connect to ends two this for a good AM signal
Your question is unclear, but if you're building a crystal set you would use the higher value section.
@@vk3ye ok so I've got this antenna cross I built with copper wiring wrapped around it (equal distance apart of course). Do I now solder the two ends of the copper to the middle and left leg on the capacitor for an AM signal? Thanks
@@mr.summerset8054 Depends on how much capacitance you need.
When you combine the middle pin with the left pin the values are a wider range. Then moving the lead from the left pin to the right pin and checking the range gives a lower range result. I understand because there are 2 varicapacitors, but when you measure from left pin and right pin, omitting the middle pin, the values a greatly diminished to a lower range. Why?
The lower capacitance is because the two variable capacitors are in series. Sometimes used to advantage by magnetic loop antenna builders but rarely in other projects.
@@vk3ye Thanks for the quick reply Peter. KB8AMZ
Hello there! Do you know the maximum voltage that could be safely applied for this kind of capacitor? Thanks!
I wouldn't know sorry. But I wouldn't use it for more than 5 or 10w power.
When using one of these in a L match for QRP witch connections do you recommend ? The two outer, the left and center or the right one and the center
Mostly 2 outer so the two are in parallel to give the highest capacitance. See my other L-match videos etc.
Hello sir
why there is 3 wires in gang capacitor
Because there's a common lead plus one wire for each section.
@@vk3ye Hello sir
what is section
@@jeetenderkakkar7570 See my video on variable capacitors for an introduction ruclips.net/video/lgsnODpVWVw/видео.html