Couple questions about K2

[Alexey Kats]

Hi there,

I have a small question. The K2 manual refers couple times to the
"Adding a SPLIT/RIT/XIT LED to the K2" application note, but I cannot
find it anywhere. Could anybody point me to where it is located? Sorry
for the silly question and thank you .

(I do not have K2 kit, so I have no idea what the current manual is
saying - I am simply going through PDFs on the Elecraft's web site.)

Oh, and while I am at it, I have one more question. If I am only
interested in high performance QRP CW rig, would it benefit me to get
SSB option for K2? Will it improve anything for CW? I think I'd like to
have it just for the sake of having a complete rig, but will it have any
benefit or will it be just a potentially useful feature?

Once again, thank you in advance for all the answers.

--
Alexey Kats

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[Alexey Kats]

AB7CE's mod? Interesting... Are you referring to the one where T7 needs
to be rewound?



Val wrote:
> Alexey,
>
> You don't need SSB option, if you are going to operate CW only. This is
> the beauty of K2 - you pay only for what you really need.
> Furthermore, If you are goung to use K2 only for CW, I strongly suggest
> you to make AB7CE mod, which improve the narrow band filter performance.
>
> 73, Val LZ1VB

--
Alexey Kats
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[Don Wilhelm-4]

You can find the SPLIT/RIT/XIT LED mod on Tom Hammond's website.  
Apparently the link on the Elecraft website has disappeared.
Go to http://www.n0ss.net/index_k2.htm.

73,
Don W3FPR

Alexey Kats wrote:

> Hi there,
>
> I have a small question. The K2 manual refers couple times to the
> "Adding a SPLIT/RIT/XIT LED to the K2" application note, but I cannot
> find it anywhere. Could anybody point me to where it is located? Sorry
> for the silly question and thank you .
>
> (I do not have K2 kit, so I have no idea what the current manual is
> saying - I am simply going through PDFs on the Elecraft's web site.)
>
> Oh, and while I am at it, I have one more question. If I am only
> interested in high performance QRP CW rig, would it benefit me to get
> SSB option for K2? Will it improve anything for CW? I think I'd like to
> have it just for the sake of having a complete rig, but will it have any
> benefit or will it be just a potentially useful feature?
>
> Once again, thank you in advance for all the answers.
>
>  

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[Don Wilhelm-4]

Alexey,

That is a very old mod (2003) and was one of the experimental things
done at that time.
Since then, the T7 winding ratio has been changed and the specs on the
IF filter crystals have been modified.
Currently I do not believe there is any benefit in applying that mod to
a K2.  If you have a very old K2, simply change the T7 winding to the
ratio given in the current K2 manual.

73,
Don W3FPR

Alexey Kats wrote:

> AB7CE's mod? Interesting... Are you referring to the one where T7 needs
> to be rewound?
>
>
>
> Val wrote:
>  
>> Alexey,
>>
>> You don't need SSB option, if you are going to operate CW only. This is
>> the beauty of K2 - you pay only for what you really need.
>> Furthermore, If you are goung to use K2 only for CW, I strongly suggest
>> you to make AB7CE mod, which improve the narrow band filter performance.
>>
>> 73, Val LZ1VB
>>    
>
>  

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[lstavenhagen]

The SSB module won't buy you anything for CW, unless you plan to use J2A where modulation is required (i.e. the method for CW used in cocoaModem, etc.). The RX and filters in the base CW rig are already ideal for normal CW and it has a built-in keyer as well.

I elected not to put the SSB module in my K2 and haven't missed it for CW....

73,
LS
W5QD

[Sverre Holm (LA3ZA)]

If you are interested in adding LEDs to the K2 you may want to look at my description on how to add up to 5 LEDs without drilling any holes in the K2, see K2 LEDS. They are:

1. Split/RIT/XIT
2. Zero-beat detector
3. Analog audio filter
4. TX on
5. RX ant on

Alexey Kats wrote

I have a small question. The K2 manual refers couple times to the
"Adding a SPLIT/RIT/XIT LED to the K2" application note,

Sverre, LA3ZA

[Alexey Kats]

Thank you all very much for the answers - I think I understand what I
want from K2 much better now. I hope I'll have as much fun building it
as I had with K1.

--
Alexey Kats (neko)
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[Alexey Kats]

This is a nice idea - LEDs inside of button caps... Hmmm... I was
toying an idea of putting different colour LEDs right above the LCD
indicator between its top side pins(they should be quite visible as
long as the colour is different from its backlight), but putting them
inside of button caps is much more elegant.

On Mon, May 24, 2010 at 8:15 AM, Sverre Holm (LA3ZA) [via Elecraft]
<[hidden email]> wrote:

> If you are interested in adding LEDs to the K2 you may want to look at my
> description on how to add up to 5 LEDs without drilling any holes in the K2,
> see K2 LEDS. They are:
>
> 1. Split/RIT/XIT
> 2. Zero-beat detector
> 3. Analog audio filter
> 4. TX on
> 5. RX ant on
>
> Alexey Kats wrote:
> I have a small question. The K2 manual refers couple times to the
> "Adding a SPLIT/RIT/XIT LED to the K2" application note,
>
> Sverre, LA3ZA
> Sverre, LA3ZA K2 #2198, K3 #3391 LA3ZA Unofficial Guide to K2 modifications
>
> ________________________________
> This email was sent by Sverre Holm (LA3ZA) (via Nabble)
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> To receive all replies by email, subscribe to this discussion
>
>

--
Alexey Kats (neko)

[Bill Coleman-2]

On May 25, 2010, at 3:13 AM, Alexey Kats wrote:

> This is a nice idea - LEDs inside of button caps... Hmmm... I was
> toying an idea of putting different colour LEDs right above the LCD
> indicator between its top side pins(they should be quite visible as
> long as the colour is different from its backlight), but putting them
> inside of button caps is much more elegant.

How exactly do you get the LEDs inside the button caps?

Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901

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[Alexey Kats]

I was referring to this mod

http://www.qslnet.de/member/la3za/K2_LEDS.html

The technique of installing micro LEDs inside of push button caps is
described here:

http://www.n0ss.net/kr5l_led_cw_tuning_ind.pdf

On Tue, May 25, 2010 at 7:14 PM, Bill Coleman <[hidden email]> wrote:

>
> On May 25, 2010, at 3:13 AM, Alexey Kats wrote:
>
>> This is a nice idea - LEDs inside of button caps... Hmmm... I was
>> toying an idea of putting different colour LEDs right above the LCD
>> indicator between its top side pins(they should be quite visible as
>> long as the colour is different from its backlight), but putting them
>> inside of button caps is much more elegant.
>
> How exactly do you get the LEDs inside the button caps?
>
> Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
> Web: http://boringhamradiopart.blogspot.com
> Quote: "Not within a thousand years will man ever fly!"
>            -- Wilbur Wright, 1901
>
>

--
Alexey Kats (neko)
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