[CW] CW Keyer Interface

[sbjohnston at aol.com]

>Please confirm 800v @ 300 ma.   240 VA.  
>No transmitter should have that kind of voltage at the key terminals:  it is deadly.
>I bet your specifications are wrong.

Good point - cathode keying usually has a much lower voltage than that present at the key, not the full B+.   You do end up carrying the full current through the key or keyer-interface, but the voltage present when the key is open floats up to a fairly reasonable value.  

 

 

Steve WD8DAS

sbjohnston at aol.com
http://www.wd8das.net/
--------------------------------------------------------------------
Radio is your best entertainment value.
--------------------------------------------------------------------




 

 

-----Original Message-----
From: D.J.J. Ring, Jr. <n1ea at arrl.net>
To: CW Reflector <cw at mailman.qth.net>
Sent: Mon, Oct 26, 2015 12:14 am
Subject: Re: [CW] CW Keyer Interface



Please confirm 800v @ 300 ma.   240 VA.  No transmitter should have that kind of voltage at the key terminals:  it is deadly.
I bet your specifications are wrong.
If not, get rid of that thing in a crusher, or convert to grid block keying.
73
DR

On Oct 26, 2015 12:46 AM, "Lee" <L at w0vt.us> wrote:

Does anyone on here know of an available keyer interface (built or in kit form) to interface a modern ss keyer to a cathode keyed transmitter?  Something good for 800 volts @ around 300 ma or more? I'd also use it with a semi-automatic bug to get the high voltage and current off of the bug or straight key.

I found one that would work nicely on "Ham Gadgets" home page, but when I went to order one, a flag popped up saying it was not in stock.  (UKA-3+)

All my modern keyers around here are OK with QRP rigs and the newer transceivers, but they can't handle cathode keyed transmitters. Right now I'd like to use my Eldico TR-75 TV transmitter as I had one as a kid back in 1953.  I think I need an interface to use my keyer.

Anyone have any suggestions.?

Lee, w0vt
______________________________________________________________
CW mailing list
Home: http://mailman.qth.net/mailman/listinfo/cw
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:CW at mailman.qth.net
CW List ARCHIVES: http://mailman.qth.net/pipermail/cw/
Unsubcribe send email to
cw-unsubscribe at mailman.qth.net
Subscribe send email to cw-subscribe at mailman.qth.net
Support this email list: http://www.qsl.net/donate.html

=30=



______________________________________________________________
CW mailing
list
Home: http://mailman.qth.net/mailman/listinfo/cw
Help:
http://mailman.qth.net/mmfaq.htm
Post: mailto:CW at mailman.qth.net
CW List
ARCHIVES: http://mailman.qth.net/pipermail/cw/
Unsubcribe send email
to
cw-unsubscribe at mailman.qth.net
Subscribe send email to
cw-subscribe at mailman.qth.net
Support this email list:
http://www.qsl.net/donate.html

=30=
 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/cw/attachments/20151026/7402319b/attachment.html>