K2 - KPA100 RS232 interface repair

[Jim Brown-10]

On Sat,8/22/2015 10:21 PM, Richard W. Solomon wrote:
> Not to flog this horse any further, but I direct you to page 85 of the K2
> Manual where the DB-9 connector is labeled ..."RS-232 and AUX I/O"... .
>
> Is it RS-232 or not ??? Is it mis-labeled ????

The fact that it says RS-232 AND AUX I/O should be a clue -- a full
RS-232 interface requires the use of all 9 pins, leaving nothing for AUX
I/O. All of the ham gear I've ever interfaced to uses only two circuits
and three pins  -- 2 (RXD),3 (TXD), and 5 (Sig Gnd) for control, leaving
the other pins and lines for other uses. Pins 4 (DTR) and 7 (RTS) are
used by many logging programs to send CW and PTT. There's a piece in QST
from 10-15 years ago showing how to build an ICOM interface getting
power from either DTR or RTS (I don't recall which).

73, Jim K9YC
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[Edward R Cole]

Great retort, Don.  You beat me to saying the same thing.

So plug it in with assumptions and you get the "stupeed" award.  If
lucky it just sits there and does nothing.  Unlucky and you just
tested your warrantee (Not Covered).  But hooking up ham gear without
opening manual is standard operating protocol - it seems. OK well
lets hookup the power - uh black to red; red to black - poof!  $3K up in smoke!

I really dislike the current trend of using the RJ45 as a mic
jack.  Motorola started using them that way and it ended up being one
of worst reliability parts in the system.  RJ45 don't take to being
physically stressed constantly (at the end of a mic cable).

73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     [hidden email]

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[Phil Wheeler-2]

On 8/23/15 11:57 AM, Edward R Cole wrote:
> I really dislike the current trend of using the
> RJ45 as a mic jack.  Motorola started using them
> that way and it ended up being one of worst
> reliability parts in the system.  RJ45 don't
> take to being physically stressed constantly (at
> the end of a mic cable).
I sure agree, Ed. Had to replace a Yaesu FM xcvr
mic last year for just that very reason.

73, Phil W7OX
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[alsopb]

Plus there is still another crimp tool to buy/find/use if you want to
make your own connectors.
I wonder who has the most crimp tool laying around and how many. Repair
of the jack on the rig side is no picnic either.

73 de Brian/K3KO
On 8/23/2015 19:29 PM, Phil Wheeler wrote:

>
>
> On 8/23/15 11:57 AM, Edward R Cole wrote:
>> I really dislike the current trend of using the RJ45 as a mic jack.  
>> Motorola started using them that way and it ended up being one of
>> worst reliability parts in the system.  RJ45 don't take to being
>> physically stressed constantly (at the end of a mic cable).
> I sure agree, Ed. Had to replace a Yaesu FM xcvr mic last year for
> just that very reason.
>
> 73, Phil W7OX
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[Edward R Cole]

How many crimp tools?  (accumulated partly for working jobs I had to
supply my own tools)

Two coax crimpers for RG58/RG59/RG174 - the one I use is ratcheted
with replaceable dies
One NAPA crimper for butt spices, spades, and ring connectors
One RJ11/RJ45
Two Molex type 1.4 to 2.8mm
One for 50-conductor computer cable and ribbon wire connectors
One snap-ring plier

at work I had a $500 Times Microwave coax crimper up to 1/2 inch
(LMR-600) connectors.  I do not use crimp-style at home;
preferring  the old back-nut clamp-style connector for N connectors.
(retired so no access to this one)

I do make RG58 and RG8x crimped N and BNC connectors (primarily
shorter jumper cables).
-----------------
From: brian <[hidden email]>
To: [hidden email]
Subject: Re: [Elecraft] RJ-45 was K2.....
Message-ID: <[hidden email]>
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Plus there is still another crimp tool to buy/find/use if you want to
make your own connectors.
I wonder who has the most crimp tool laying around and how many. Repair
of the jack on the rig side is no picnic either.

73 de Brian/K3KO


73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     [hidden email]

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