Elecraft › [K2]

K2 with Microkeyer II & N1MM

Classic

List

Threaded

3 messages Options

Ray G3XLG

K2 with Microkeyer II & N1MM

I have been using my Microkeyer so far on DATA & contests with the K2 audio
output fed from the front panel headphone jack (with an adaptor to take the
headphones as well).

But I really would prefer to take a fixed audio output from the K2
elsewhere, back to the Microkeyer.

Microham in the wiring diagram supplied with their Microkeyer advocate just
taking a shielded double line from J5 in the K2 (? back of product
detector?) to a new stereo jack mounted on the K2 rear chassis.

I believe however that Don (W3FPR) & Tom Hammond developed a mod which
included an audio amplifier IC for the same purpose & mounted it initially
on the K2 side panel & later, or the Control Board. This is obviously more
complicated & I wonder if anyone has tried the much simpler MicroHAM
solution? What are the advantages of the audio amp mod?

73

Ray, G3XLG

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Ray G3XLG

Joe Subich, W4TV-4

Re: K2 with Microkeyer II & N1MM

> I believe however that Don (W3FPR)& Tom Hammond developed a mod
> which included an audio amplifier IC for the same purpose& mounted it
> initially on the K2 side panel& later, or the Control Board. This is
> obviously more complicated& I wonder if anyone has tried the much
> simpler MicroHAM solution? What are the advantages of the audio amp
> mod?

The W3FPR modification is certainly a better mod technically. It is
necessary with passive interfaces and low sensitivity sound cards. The
current microHAM interfaces include a preamplifier for their internal
sound cards that provide sufficient sensitivity for the low level at
J5 in the K2.

Were it me, I would consider the W3FPR amp mod (or other buffer amp)
in order to assure that any problem external to the K2 (e.g., shorted
or improperly connected cable) did not cause loss of performance.

The microHAM connection provides an easy way to get going quickly with
minimum parts/soldering.

73,

... Joe, W4TV

On 1/17/2012 6:27 AM, Ray Spreadbury wrote:

> I have been using my Microkeyer so far on DATA& contests with the K2 audio
> output fed from the front panel headphone jack (with an adaptor to take the
> headphones as well).
>
>
>
> But I really would prefer to take a fixed audio output from the K2
> elsewhere, back to the Microkeyer.
>
>
>
> Microham in the wiring diagram supplied with their Microkeyer advocate just
> taking a shielded double line from J5 in the K2 (? back of product
> detector?) to a new stereo jack mounted on the K2 rear chassis.
>
>
>
> I believe however that Don (W3FPR)& Tom Hammond developed a mod which
> included an audio amplifier IC for the same purpose& mounted it initially
> on the K2 side panel& later, or the Control Board. This is obviously more
> complicated& I wonder if anyone has tried the much simpler MicroHAM
> solution? What are the advantages of the audio amp mod?
>
>
>
> 73
>
> Ray, G3XLG
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Don Wilhelm-4

Re: K2 with Microkeyer II & N1MM

There are no boards or kits available, but the circuit is easy enough to
build on perfboard - it is simply an LM386 amplifier stage.
You can find the information about it on either my website www.w3fpr.com
or it is still on Tom Hammond's (SK) website www.n0ss.net.

73,
Don W3FPR

On 1/17/2012 10:20 AM, Joe Subich, W4TV wrote:

>> I believe however that Don (W3FPR)& Tom Hammond developed a mod
>> which included an audio amplifier IC for the same purpose& mounted it
>> initially on the K2 side panel& later, or the Control Board. This is
>> obviously more complicated& I wonder if anyone has tried the much
>> simpler MicroHAM solution? What are the advantages of the audio amp
>> mod?
> The W3FPR modification is certainly a better mod technically. It is
> necessary with passive interfaces and low sensitivity sound cards. The
> current microHAM interfaces include a preamplifier for their internal
> sound cards that provide sufficient sensitivity for the low level at
> J5 in the K2.
>
> Were it me, I would consider the W3FPR amp mod (or other buffer amp)
> in order to assure that any problem external to the K2 (e.g., shorted
> or improperly connected cable) did not cause loss of performance.
>
> The microHAM connection provides an easy way to get going quickly with
> minimum parts/soldering.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 1/17/2012 6:27 AM, Ray Spreadbury wrote:
>> I have been using my Microkeyer so far on DATA& contests with the K2 audio
>> output fed from the front panel headphone jack (with an adaptor to take the
>> headphones as well).
>>
>>
>>
>> But I really would prefer to take a fixed audio output from the K2
>> elsewhere, back to the Microkeyer.
>>
>>
>>
>> Microham in the wiring diagram supplied with their Microkeyer advocate just
>> taking a shielded double line from J5 in the K2 (? back of product
>> detector?) to a new stereo jack mounted on the K2 rear chassis.
>>
>>
>>
>> I believe however that Don (W3FPR)& Tom Hammond developed a mod which
>> included an audio amplifier IC for the same purpose& mounted it initially
>> on the K2 side panel& later, or the Control Board. This is obviously more
>> complicated& I wonder if anyone has tried the much simpler MicroHAM
>> solution? What are the advantages of the audio amp mod?
>>
>>
>>
>> 73
>>
>> Ray, G3XLG
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>