[GreenKeys] Pulling vs Holding selector magnets

[Mike Douglas]

 If you want post a picture of the selector area of your unit, several people here will be able to tell you whether it's pulling or holding. Also, look for "HM" stamped" on the rangefinder frame. If present, then you have a holding magnet selector. If not present, it's probably pulling magnet.

Mike D

     On Monday, January 20, 2025 at 09:00:50 AM CST, steve bennett via GreenKeys <greenkeys at mailman.qth.net> wrote:  
 
  John,
 Mine are round, in series, and there is no terminal strip.So are pulling magnets 20mA or 60mA?I guess to be on the safe side I can always start with 20 and increase if needed.
-Steve
    On Monday, January 20, 2025 at 09:30:03 AM EST, John, W9DDD <w9ddd at tapr.org> wrote:  
 
 I think pulling magnets are rounder (fatter too?) and the holding are 
squarer in cross section.  Also think pulling are always wired one way 
(series?) and holding will have a terminal strip where they can be wired 
in series for 20 mA and parallel for 60 mA.


On 1/20/2025 7:23 AM, steve bennett via GreenKeys wrote:
> GKs,
>
>  How do I know if my M15 is using a pulling magnet vs a holding magnet?
> Why do the two variations exist?
>
> I know my coils are in series and measure 110 ohms each.
> The schematic for the holding magnet type says series coils are 0.020A 
> (not 0.060A.)
> I don't know if this  applies to pulling magnets and don't know which 
> type I have.
> Makes sense that series coils would draw less current all other things 
> being equal.
> So my loop needs to be 0.020A?
> Guess I could do a test and see how many amps my coils pull in at.
>
> Just thinking out loud.....Would a holding magnet type use some other 
> method of doing the pull in?
> Some mechanical link from the main shaft to pull the magnets in?
>
> Thanks,
> -Steve
>
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
>>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to w9ddd at tapr.org

-- 
---
----
The above comments or recommendations are SWAG. Use at your own risk.

John, W9DDD

______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to raleigh_ranger at yahoo.com
  ______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to deramp5113 at yahoo.com  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20250120/2a6a964e/attachment.html>