K3 interface with N1MM

[Steve Reichlyn]

Good Evening, All

I'd like to interface my K3 to N1MM. Am I assuming correctly that one needs
only connect the rig's RS232 port to a serial port
on the computer to get full radio control AND CW sending? If not, an RS232
cable from K3 to computer and LPT1 keying interface
from computer to rig?

Regarding RTTY, can I use a 15 pin video cable with the correct wires
connected for FSK using a DXP38 modem?

Any hints would be gratefully appreciated.

Thanks
Steve AA4V
K3 #855

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[Bill Maddock-2]

Steve,

   This is correct - it works great - I have run mine at 38400 or
4800 either way with a standard serial cable with db9 and I have the
USB interface which configures fine also!

73 de Bill N4ZI


--- On Mon, 7/28/08, Stephen Reichlyn <[hidden email]> wrote:

> From: Stephen Reichlyn <[hidden email]>
> Subject: [Elecraft] K3 interface with N1MM
> To: [hidden email]
> Date: Monday, July 28, 2008, 5:43 PM
> Good Evening, All
>
> I'd like to interface my K3 to N1MM. Am I assuming
> correctly that one needs
> only connect the rig's RS232 port to a serial port
> on the computer to get full radio control AND CW sending?
> If not, an RS232
> cable from K3 to computer and LPT1 keying interface
> from computer to rig?
>
> Regarding RTTY, can I use a 15 pin video cable with the
> correct wires
> connected for FSK using a DXP38 modem?
>
> Any hints would be gratefully appreciated.
>
> Thanks
> Steve AA4V
> K3 #855
>
> _______________________________________________
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> You must be a subscriber to post to the list.
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[Jim Brown-10]

On Mon, 28 Jul 2008 18:43:02 -0400, Stephen Reichlyn wrote:

>I'd like to interface my K3 to N1MM. Am I assuming correctly that
>one needs only connect the rig's RS232 port to a serial port
>on the computer to get full radio control AND CW sending?

For radio control, CW, and PTT, you need a DB9 to DB9 with wires
connecting pins 2, 3, 4, 5, and 7. Then go into Config and tell the
K3 to look for CW and PTT on 4 and 7 respectively.

If you have an unusually severe "RF in the shack" problem (for
example, you're loading a long wire that ends in the shack), you
should look at the special serial cable wiring in my RFI tutorial. My
serial cable is home made and uses the four twisted pairs in
unshielded CAT5 for the connection, with the return conductor of each
pair going to ground and the hot conductors of each pair going to 2,
3, 4, and 7, respectively. I also solve the pin 1 problem built into
most radios and most computers by connecting those return conductors
to the connector shell, not pin 5.

http://audiosystemsgroup.com/RFI-Ham.pdf 

73,

Jim Brown K9YC


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[Dave Hachadorian]

----- Original Message -----
From: "Stephen Reichlyn" <[hidden email]>
To: <[hidden email]>
Sent: Monday, July 28, 2008 3:43 PM
Subject: [Elecraft] K3 interface with N1MM


> Good Evening, All
>
> I'd like to interface my K3 to N1MM. Am I assuming
> correctly that one needs only connect the rig's RS232 port
> to a serial port
> on the computer to get full radio control AND CW sending?
--------------------------------

Yes, but you have to be careful when powering up the K3 that
the computer keying line is not key-down, which may happen
if you are not running your logging program at the time.
It's scary when you turn the radio on and it immediately
goes into transmit! I think there is a software change in
the works to prevent the K3 from transmitting when you first
turn it on if the key line is keyed.

> Regarding RTTY, can I use a 15 pin video cable with the
> correct wires connected for FSK using a DXP38 modem?

You might get away with doing it that way, but the shielding
in a video cable is irrelevant to the ACC connector pinout.
I think you would be better off going to Radio Shack and
buying a plastic hood and male DB-15 and making your own
nicely shielded FSK cable with a piece of RG-174.

Dave Hachadorian, K6LL
Big Bear Lake, CA




































.

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[Jim Brown-10]

On Mon, 28 Jul 2008 16:25:17 -0700, Dave Hachadorian wrote:

>You might get away with doing it that way, but the shielding
>in a video cable is irrelevant to the ACC connector pinout.
>I think you would be better off going to Radio Shack and
>buying a plastic hood and male DB-15 and making your own
>nicely shielded FSK cable with a piece of RG-174.

Consumer computer and audio cables are notoriously crummy. One of
the most common weaknesses is lousy signal return conductors. Often,
computer video cables are not coax, just parallel wires!

FWIW, coax provides no shielding against magnetic fields, only
electric fields. If you want to reject RF and magnetic fields, use
TWISTED pairs. If you want to reject power-related voltage between
interconnected boxes (often blamed on the old wives' tale of "ground
loops,") simply bond the chassis of the interconnected boxes
together with a SHORT length of heavy copper braid (like the copper
braid removed from a short piece of RG8 or RG11 designed for
transmitting).

See http://audiosystemsgroup.com/RFI-Ham.pdf  and
http://audiosystemsgroup.com/HamInterfacing.pdf

73,

Jim Brown K9YC



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[Charly]

Have u noticed that it seems that always you

get a notice of delivery  on a Friday afternoon

that sez "delivery sked for next Monday"

or that the store you need to shop at closes

the very minute you get off work, or

u get fired on a Friday afternoon and can

not look for work until next Monday.

Why is that?


Charles Harpole


[hidden email]





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[S Sacco]

Not once have I ever had any of those problems.

Must be that the gods are specifically mad at you, Chas.  ;-)



On Sun, Aug 17, 2008 at 8:58 AM, Charles Harpole <[hidden email]> wrote:

>
> Have u noticed that it seems that always you
>
> get a notice of delivery  on a Friday afternoon
>
> that sez "delivery sked for next Monday"
>
> or that the store you need to shop at closes
>
> the very minute you get off work, or
>
> u get fired on a Friday afternoon and can
>
> not look for work until next Monday.
>
> Why is that?
>
>
> Charles Harpole
>
>
> [hidden email]
>
>
>
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
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>
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> Elecraft web page: http://www.elecraft.com
>

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