Elecraft

K2: IF Tap Point

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Jim KO5V

K2: IF Tap Point

Good morning,

I have a HupRF PAT tap buffer amp board for my K2's IF. I installed an SMA connector on the heatsink panel
when I built the rig.

Looking at the K2's block diagram, the IF is shown between the mixer and post-mixer pre-amp. On the schematic,
that appears to be between Z6, pin 2, and C159. My plan is tap the mixer-side of C159, then attach the ground
braid to the ground side of R80. Is this the right way to do this?

I've searched this reflector, and the web, and I can't really find anything specific using "K2 IF out", etc.

SDR kits' site (they sell G4HUP's kits since Dave passed away), and the HupRF site have no instructions for
Elecraft rigs. There are links to installation instructions in the most popular Yaekencom radios, but not the K2,
even though they are selling the K2 boards.

Thanks again. 73,

Jim KO5V
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Don Wilhelm

Re: K2: IF Tap Point

Jim,

The IF take-off point normally used for the K2 is at J12 pin 1 which is
after the Post-Mixer amplifier. That point provides a signal that is
about equal in strength to the antenna input affords isolation for BFO
leakthrough.

For everyone's information, DX Engineering is selling the Clifton Labs
buffer amplifier (but not the specific K2 version that Jack Smith (SK)
also sold.

73,
Don W3FPR

On 2/15/2019 12:02 PM, Jim KO5V wrote:

> Good morning,
>
> I have a HupRF PAT tap buffer amp board for my K2's IF. I installed an SMA connector on the heatsink panel
> when I built the rig.
>
> Looking at the K2's block diagram, the IF is shown between the mixer and post-mixer pre-amp. On the schematic,
> that appears to be between Z6, pin 2, and C159. My plan is tap the mixer-side of C159, then attach the ground
> braid to the ground side of R80. Is this the right way to do this?
>
> I've searched this reflector, and the web, and I can't really find anything specific using "K2 IF out", etc.
>
> SDR kits' site (they sell G4HUP's kits since Dave passed away), and the HupRF site have no instructions for
> Elecraft rigs. There are links to installation instructions in the most popular Yaekencom radios, but not the K2,
> even though they are selling the K2 boards.
>
> Thanks again. 73,
>
> Jim KO5V

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Jim KO5V

Re: K2: IF Tap Point

In reply to this post by Jim KO5V

Don,

Thank you, that makes sense.

73, Jim KO5V

-----Original Message-----

>From: Don Wilhelm <[hidden email]>
>Sent: Feb 15, 2019 10:41 AM
>To: Jim KO5V <[hidden email]>, Elecraft List <[hidden email]>
>Subject: Re: [Elecraft] K2: IF Tap Point
>
>Jim,
>
>The IF take-off point normally used for the K2 is at J12 pin 1 which is
>after the Post-Mixer amplifier. That point provides a signal that is
>about equal in strength to the antenna input affords isolation for BFO
>leakthrough.
>
>For everyone's information, DX Engineering is selling the Clifton Labs
>buffer amplifier (but not the specific K2 version that Jack Smith (SK)
>also sold.
>
>73,
>Don W3FPR
>
>
>On 2/15/2019 12:02 PM, Jim KO5V wrote:
>> Good morning,
>>
>> I have a HupRF PAT tap buffer amp board for my K2's IF. I installed an SMA connector on the heatsink panel
>> when I built the rig.
>>
>> Looking at the K2's block diagram, the IF is shown between the mixer and post-mixer pre-amp. On the schematic,
>> that appears to be between Z6, pin 2, and C159. My plan is tap the mixer-side of C159, then attach the ground
>> braid to the ground side of R80. Is this the right way to do this?
>>
>> I've searched this reflector, and the web, and I can't really find anything specific using "K2 IF out", etc.
>>
>> SDR kits' site (they sell G4HUP's kits since Dave passed away), and the HupRF site have no instructions for
>> Elecraft rigs. There are links to installation instructions in the most popular Yaekencom radios, but not the K2,
>> even though they are selling the K2 boards.
>>
>> Thanks again. 73,
>>
>> Jim KO5V

Elecraft mailing list

Re: K2: IF Tap Point

In reply to this post by Don Wilhelm

Don

Do you know what has to be done (extra circuitry etc) to get the DXE Clifton Lab amp to work with a K2 and essentially mirror the functionality of Jack Smith’s one?

Paul Gacek
W6PNG/M0SNA

> On Feb 15, 2019, at 9:41 AM, Don Wilhelm <[hidden email]> wrote:
>
> Jim,
>
> The IF take-off point normally used for the K2 is at J12 pin 1 which is after the Post-Mixer amplifier. That point provides a signal that is about equal in strength to the antenna input affords isolation for BFO leakthrough.
>
> For everyone's information, DX Engineering is selling the Clifton Labs buffer amplifier (but not the specific K2 version that Jack Smith (SK) also sold.
>
> 73,
> Don W3FPR
>
>
>> On 2/15/2019 12:02 PM, Jim KO5V wrote:
>> Good morning,
>> I have a HupRF PAT tap buffer amp board for my K2's IF. I installed an SMA connector on the heatsink panel
>> when I built the rig.
>> Looking at the K2's block diagram, the IF is shown between the mixer and post-mixer pre-amp. On the schematic,
>> that appears to be between Z6, pin 2, and C159. My plan is tap the mixer-side of C159, then attach the ground
>> braid to the ground side of R80. Is this the right way to do this?
>> I've searched this reflector, and the web, and I can't really find anything specific using "K2 IF out", etc.
>> SDR kits' site (they sell G4HUP's kits since Dave passed away), and the HupRF site have no instructions for
>> Elecraft rigs. There are links to installation instructions in the most popular Yaekencom radios, but not the K2,
>> even though they are selling the K2 boards.
>> Thanks again. 73,
>> Jim KO5V
> ______________________________________________________________
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>
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> Please help support this email list: http://www.qsl.net/donate.html
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Don Wilhelm

Re: K2: IF Tap Point

Since I have no had my hands on a DXE buffer amplifier, I have to guess.
Jack had a bandpass filter designed for the K2 at the output that peaked
the response at 4915 kHz.
I have the Z10000B-K2 buffer instructions on my computer. If DXE is
using the same board layout, then it should be easy for anyone to add
the filter from the instructions.

If you want a copy, send me an email off-reflector and I will send a
copy to you.

73,
Don W3FPR

On 2/15/2019 1:26 PM, Paul Gacek wrote:
> Don
>
> Do you know what has to be done (extra circuitry etc) to get the DXE Clifton Lab amp to work with a K2 and essentially mirror the functionality of Jack Smith’s one?
>
> Paul Gacek
> W6PNG/M0SNA
>
>

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