[GreenKeys] Re: polar loops

[Eugene Hertz]

Well, Jack (wa2hwj@)has become intimately familiar with the ticker, and I believe his assessment was it could not be modified for neutral...

If you want to see pix (Ticker 1 has good pictures of internals)...

http://www.hertzmail.com/5a/

Ultimately, I would love to find/build a circuit that could take rs232 and key a polar loop +/- 60ma.  In that way I would use software to handle ascii-6-level conversion and to signal the rs232 lines at the right baud rate. 

Any ideas?
Eugene Hertz



>-----Original Message-----
>From: gil smith [mailto:gil at vauxelectronics.com]
>Sent: Wednesday, June 16, 2004 04:57 PM
>To: greenkeys at mailman.qth.net
>Cc: 'Eugene Hertz'
>Subject: polar loops
>
>Hi folks: 
> 
>Can anyone give a decent explanation of a polar loop? Eugene apparently 
>has a polar machine, and wants to drive it -- I presume there are other 
>polar machines out there as well, though we don't hear much about them. 
> 
>If I understand it correctly, a polar loop reverses the current direction 
>for mark/space, unlike the current-on/off of a normal loop. I presume 
>polar lines would support longer distances and do better under noisy 
>conditions. 
> 
>What is needed to convert a standard loop to drive a polar machine? 
> 
>Can Eugene's 5A machine get a simple wiring change to bypass the polar 
>input and drive the selector magnets directly from a normal loop? 
> 
>ps: Eugene: do you have any pics of your machine? 
> 
>thanks, 
> 
>gil 
> 
> 
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