[DSP-10] DSP-10 and Elecraft K2

[Bob Larkin]

Hello Phil and All,

The DSP-10 EZKIT Lite program can be interfaced for receive as an audio
processor. But there is provision for a frequency offset, and so the audio
does not need to be real audio. A signal up to about 21 kHz will be SSB
detected and then audio processed. Notes:

1-I got careless when fixing up version 2 of the DOS software and forgot to
test the audio processor! At the last moment, I did check it and certain
functions had a bug. So instead of holding things up, I went ahead and
locked out all modes except USB with a + frequency offset. I also locked out
transmit.

2-Since then, I have gone back and fixed the bug. In thinking about it, I
decided to eliminate audio input as a special case. Instead, the last
transverter position (CTRL-ALT-O) will be audio input. This simplifies the
software and works fine. With this change all modes are available, as is
transmit.  It gives you everything that you have with the full RF hardware
except frequency control. This is in Ver 2.10 (DOS) that is almost ready to
go. There are a handful of other additions and fixes.

3-hardware=0 in the .cfg file takes care of not having any provision for
push-to-talk.

4-You can operate the 2-meter version as a high I-F for HF work. Just setup
any of the transverters positions in the .cfg file with the appropriate LO
frequency and it will do the rest. The .cfg file allows for either high or
low side conversion. This has not been tested much and there may be some
minor problems in the frequency control. If anyone plays with this, let me
know what you find.

5-If you use the audio processor for EME, the operating frequency is not
available directly, but is inputted from the .cfg file. This is for doing
the Doppler offset.

6-The audio processor is useful as a piece of test equipment, i.e., as an
audio spectrum analyzer.

No promises on 2.10, but it shouldn't be long. Meanwhile use ALT-I for
receiving.

73, Bob  W7PUA

At 04:16 PM 3/12/02 +0800, you wrote:
>Hi,
>
>I'm considering using an EZ-KIT Lite running the DSP-10 software with an
>Elecraft K2 HF transceiver. I have used the software in audio mode as a DSP
>filter for the AF out from the K2 and this works just fine. 
>
>Since the K2's AGC control system works at 150KHz, and can conveniently be
>extracted from the K2 circuit board at high level, I was thinking about
>mixing this down to 15KHz, using a 602 mixer, and feeding this to the EZ-KIT
>Lite.
>
>I figured that that way I could use the DSP to demodulate the signals,
>filter, notch, de-noise etc. I only need to use the DSP on receive since I
>will use the existing K2 transmit strip. 
>
>Is it as simple as setting the configuration variable 'hardware' to 1 or are
>there other control signal I need to set in order to fool the EZ-KIT Lite
>into thinking its talking to the DSP-10 RF board?
>
>Any comments would be appreciated.
>
>73's  Phil... VK6APH
>
>
>
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