[LCC] N1MM Plus Keying

[Marsh Stewart]

Hi David,

There is a reliable keying interface that works with N1MM, N1MM+, and
WriteLog. Only one small switching transistor and one resistor are required.
The transistor can be a 2N2222.

See CW Circuit at http://www.aa5au.com/rtty/fsk-interface/ 

Don has the circuit right (no surprise there). Don't use Opto-isolators. The
chassis and case of your computer should be bonded to the chassis of your
radio and to ground, so why isolate the common (ground wire) in the
interface?

I wonder if any problems you are having keying your radio on CW are with the
keying interface OR the RS232 COM port? If you are using a USB to RS232
converter I highly recommend a converter with an FTDI chip. They work!

For my computer RS232 COM ports I'm using an expansion slot card with 4 real
hardware COM ports. No software emulation, no BS, just 4 COM ports each with
their own UART.

73,
Marsh, KA5M
 

-----Original Message-----
From: LCC [mailto:lcc-bounces at louisianacontestclub.org] On Behalf Of David
Norris
Sent: Friday, September 04, 2015 8:50 PM
To: LCC
Subject: [LCC] N1MM Plus Keying

Help!

Does any have a RELIABLE circuit to key the rig from N1MM Plus???

I updated the program and it has been nothing but one malfunction after
another all night!!

I'm done for CWO! 

73  

David A. Norris, K5UZ
Director, Delta Division

Sent from my iPhone
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