SCS modems with a K2

[Tom Whiteside]

Folks,
    I've never been into the digital modes much but am studying putting an
SCS Pactor III HF modem on the air as part of the ARES Winlink 2000
initiative.   I already consider my K2 as my primary ARES HF rig since I can
run it on batteries for a good long time - my question to the group is
whether anyone has successfully used a K2 with an SCS mode runninng Pactor
III.    Any data, pro or con on the K2 in this application would be
appreciated.

Tom Whiteside
N5TW Georgetown, TX

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[Stuart Rohre]

Tom,
The local SCS modem expert is Lewis Thompson, W5IFQ here at ARL.   email him
at the adr I will send, for info on the interfacing of the SCS.  He has
successfully interfaced them to the little 5 watt Yaesu radio, I know.   I
think it is pretty straightforward to interface the SCS to anything.   The
manuals are readable and VERY  complete, as I studied one when he and I
hooked the SCS to an Icom 756 Pro II.
73,
Stuart
K5KVH


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[Tom Whiteside]

Appreciate it, Stuart - would still appreciate any feedback from a K2 owner
who has tried this - the actual rig interface looks simple but they talk
about "supported rigs" and transmit receive times and their may be filter
considerations to achieve PACTOR III speeds.    I did send Lewis a note on
your suggestion - thanks!

Tom N5TW
----- Original Message -----
From: "Stuart Rohre" <[hidden email]>


> Tom,
> The local SCS modem expert is Lewis Thompson, W5IFQ here at ARL.   email
him
>

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[Doug Faunt N6TQS [phone]]

We used a PTCPro with a K2 on the T33C trip, and the radio and modem
worked just fine for log uploads.  

I've also used my PTC-IIe with my K2/100 with the EA3BLQ mod to make a
6pin digital mode mini-Din attachment point.  I wired it such that it
matches the equivalent mini-DIN on the FT-817 and IC706MKIIG, so I can
use the same cable for any of them.

73, doug

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[Bob Boehmer]

Hello.

I am building K2 SN3278 and am about to install L25 and L26 (40m low pass
filter). I have pre-wound toroids BUT the pre-wound toroids both have 16
turns. The manual says L25 should be 14 turns and L26 should be 12 turns.

I assume that the manual is correct but wanted to double check.

Thanks & 73
Bob WB3FXC

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[Richard Stasiak]

On 9-Aug-04, at 4:17 PM, Tom Whiteside wrote:

>  their may be filter
> considerations to achieve PACTOR III speeds.


Hi Tom

I have successfully used my SCS PTC IIex modem with my K2 for Winlink
remote email application.  I interface it to the rig through the mic
jack with the mod to bring receive audio to the mic jack through an
unused pin.  I am thinking of adding a din receptacle to the back of
the rig to make the connection direct and leave the mic jack free.

I run Pactor III with no trouble whatsoever and achieve great data
throughput.  The K2 (QRP) with the SCS modem is a dynamite combination
for keeping in touch via Winlink while traveling by boat, rv or even at
the picnic table up at the cottage.  I can make connection with the
host stations on 40 and 20 with a 22 foot wire thrown into a tree and a
counterpoise.

  73

Rick, ve3mm
K2/100 #1591
KX1 #188

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[Tom Whiteside]

Thanks Rick - exactly what I was looking for.   Yet another feather in the
Elecraft cap.

Tom N5TW
----- Original Message -----
From: "Richard Stasiak" <[hidden email]>
> On 9-Aug-04, at 4:17 PM, Tom Whiteside wrote:
> Hi Tom
>
> I have successfully used my SCS PTC IIex modem with my K2 for Winlink
[snip]

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[Mychael Morohovich]

Hi, Bob-

The K2 set that you have, with L25, L26 each consisting of 16 turns, is for
K2 kits that have serial numbers below 3000. Did you buy this set from me? I
ask because I keep these older toroid variations in a separate area and only
get them out when it is requested of me by a builder with an older kit. This
sort of request is rare.

Based on the serial number that you have given, L25 should have 14 turns and
L26 should have 12 turns. Regardless of how you acquired the parts, I will
send you the two correct toroids at no charge if you will supply me with
your shipping particulars.

73,
Mychael AA3WF
K2#1025


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[Mychael Morohovich]

Hi, Bob-

Thanks for the email mentioning that you acquired the parts from another ham
and not from me directly. Thank you as well for the nice words regarding my
toroids.

Yes, RFC11 is a new addition relative to the toroid set used by pre serial
number 3000 K2 kits. You will not find one in your "heritage" set. Instead,
you will notice that you have an L33 . This is the old BFO inductor that has
since been replaced by a kit supplied toroid. In this instance you will not
be using the one that I supplied.

Yes, I am from Pittsburgh, and we do live in rather close proximity to one
another! Perhaps we will meet someday, especially if you are buying lunch-
hi!

73,
Mychael



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[David Pratt-3]

I have just read Mychael's comments about L25 & L26.

I appear to have missed the change in the Low-Pass Filter components
when I upgraded my Revision A PCB to Revision B.  I see from the latest
circuit diagram that the filter is labelled "40/60m".

What is the reason for the change in the filter components, and is the
change recommended for the Revision A K2?

Thanks de David G4DMP

In a recent message, Mychael Morohovich <[hidden email]>
said....

>The K2 set that you have, with L25, L26 each consisting of 16 turns, is for
>K2 kits that have serial numbers below 3000. Did you buy this set from me? I
>ask because I keep these older toroid variations in a separate area and only
>get them out when it is requested of me by a builder with an older kit. This
>sort of request is rare.
>
>Based on the serial number that you have given, L25 should have 14 turns and
>L26 should have 12 turns. Regardless of how you acquired the parts, I will
>send you the two correct toroids at no charge if you will supply me with
>your shipping particulars.

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[Don Brown-4]

Hi

The change was made to allow for 60 meters. If you add the K60XV you will need to change the filter.

Don Brown


  ----- Original Message -----
  From: David Pratt<mailto:[hidden email]>
  To: Elecraft Reflector<mailto:[hidden email]>
  Sent: Tuesday, August 10, 2004 12:56 PM
  Subject: Re: [Elecraft] K2 L25 and L26


  I have just read Mychael's comments about L25 & L26.

  I appear to have missed the change in the Low-Pass Filter components
  when I upgraded my Revision A PCB to Revision B.  I see from the latest
  circuit diagram that the filter is labelled "40/60m".

  What is the reason for the change in the filter components, and is the
  change recommended for the Revision A K2?

  Thanks de David G4DMP

  In a recent message, Mychael Morohovich <[hidden email]<mailto:[hidden email]>>
  said....
  >The K2 set that you have, with L25, L26 each consisting of 16 turns, is for
  >K2 kits that have serial numbers below 3000. Did you buy this set from me? I
  >ask because I keep these older toroid variations in a separate area and only
  >get them out when it is requested of me by a builder with an older kit. This
  >sort of request is rare.
  >
  >Based on the serial number that you have given, L25 should have 14 turns and
  >L26 should have 12 turns. Regardless of how you acquired the parts, I will
  >send you the two correct toroids at no charge if you will supply me with
  >your shipping particulars.
  _______________________________________________
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[David Pratt-3]

Thank you, Don. I do indeed use the K60XV but have missed any reference
to the need to change the LPF.  Could you tell me please, where this
information was published?

73 de David G4DMP

In a recent message, Don Brown <[hidden email]> said....

>The change was made to allow for 60 meters. If you add the K60XV you
>will need to change the filter.
> 
>Don Brown
> 
> 
>  ----- Original Message -----
>  From: David Pratt
>  I appear to have missed the change in the Low-Pass Filter components
>  when I upgraded my Revision A PCB to Revision B.  I see from the
>  latest
>  circuit diagram that the filter is labelled "40/60m".
>
>  What is the reason for the change in the filter components, and is
>  the
>  change recommended for the Revision A K2?

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