SID monitor

[Golden]

Try 21,75 khz.

[taxma1981]

[Mike(Mont)]

almost finished . which frequency you advise me ?

I have a question for you. How is the "Constant of Time" connected? You see there is an arrow there. Looks like it connects between C7 and C8 but I don't know. All the other components have a symbol where they go, but there is no symbol there. And the holes are drilled larger like there are wires that connect there. This is on the Gyrator III PCB. Maybe this is just a jumper switch to engage C8 so the data recorder only takes samples every few seconds? Without C8 connected it is continuous? I think C8 is not needed if this is the case.

[Mike(Mont)]

Poly capacitor 1000pf
Digikey part number
399-7693-ND
Mouser part number
505-FKP21000/100/2.5

[Mike(Mont)]

I don't know if you've built the loop antenna yet, but I know it's better to keep the windings all on one layer. The instructions do not allow this as the notch on the frame is not wide enough. So I put some feet on the cross braces about 10cm wide. Best to use half-round pieces, but I used 1" x 2" pieces and rounded the corners a bit.

To wind the loop, I first put the magnet wire onto an old bicycle wheel rim. This way you can wind it tightly. It's doesn't work very well if you try to wind it off the spool. You can't pull the wire tight. Also clamp the cross braces down to a table so you can pull the wire tight but not so it stretches too much. A small amount of stretch is needed but be careful or you will break the wire.

[abdou2014]

can you post a picture of antenna

[Mike(Mont)]

Send me your email in a private message.
I can't get this to work.

[Mike(Mont)]

I don't know what the deal is around here. No one wants to send their email address. Gives me the creeps.

Do a search for Stanford Solar Center

Click on "Space Weather Monitors"
Click on "SID Monitor"
Scroll down the page to "Antennas"
There are instructions and photos there you can download.

[abdou2014]

thank you !

[Qiaozhi]

I don't know what the deal is around here. No one wants to send their email address. Gives me the creeps.

All you need to do is go to a post by abdou2014 and click on the name. A drop-down box will appear. Then click on "Send email to abdou2014".

[Mike(Mont)]

okay

[taxma1981]

http://sidstation.loudet.org/hw-en.xhtml

[taxma1981]

From frankfurt,

[abdou2014]

CAN I WORK ON LF FREQUENCY 135-200 kHz ?

[Mike(Mont)]

You would have to modify the circuit. Doesn't look that difficult. Here's an article that might give you some ideas and formula to work with. But remember my motto: Nothing is as easy as it first appears. So I am not that skill in electronics. There might be some issues further down the circuit, I don't know. Somebody else will know more about it.

https://www.aavso.org/files/gyrator1.pdf