[Elecraft] PSK31 interface?

Tue Mar 26 18:12:01 2002

I have looked at this also, and listed the three different published
alternatives that I have found on my K2 modifications page
(http://www.qsl.net/la3za/K2/mod.html#PSK31). Basically, there seems to
be three alternatives around:

- Basic set up with cables to connect/disconnect and no mods inside the
K2 (WA7SPY)
- An external switchbox (W3FPR) with few mods to the K2
- An internal board that automatically switches over on the computer's
PTT (EA3BLQ)

The last solution is the most elegant one, but unfortunately it is not
compatible with the KAF2. I have discussed this with Pauli, EA3BLQ. My
idea for an internal board is one that could be put in the corner of the
cover where the loudspeaker connector is now. Here one could put a 6 pin
mini-DIN connector for the i/o. The board size can be like the KIO2
board (3.8 x 3.8 cm), and the mini-DIN and a new loudspeaker connector
have to be mounted on the board. Most likely there will be no room for
the mike configuration header, so that will have to be done by using
different extension cables between the cable coming form the front-panel
board and the plug on the PSK31 board. That would copy all the functions
from the EA3BLQ baord in a smaller board that would fit even when the
KAF2, the KAT2, the KIO2 and the battery options are fitted (Most likely
it would not fit with the 100 W power option?)

An idea from the W3FPR switchbox is to disable the audio compresison
automatically in digital mode. His 2-transistor circuit or just a diode
with plus to the KSB2 board and minus to the digital PTT line could do
that. In addition the output to the computer should be after the KAF2
board, and this is simple by adding a connector to the KAF2 board.

So far these are just some ideas. I would be very happy for some input
from other K2 users and especially those that are familiar with PSK31
and other digital modes.

73, Sverre

Sverre Holm, LA3ZA
Asker, Norway 
---------------------------------
www.qsl.net/la3za

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nicholas
Lokuciewski
Sent: 26. mars 2002 22:49
To: [email protected]
Subject: [Elecraft] PSK31 interface?

Dear All,

Im looking to build a PSK31 interface to mount in the back of my K2.
Other 
designs I have seen, require you to disconnect the microphone or use and

external box/switch. I would like to make a more compact alternative.

My main problem, is how to switch the audio that goes into the rig, from

either the front panel mic connector or rear panel computer audio,
without 
clicking or thumping. Any ideas?

73/72 M3LOK / 2E1LOK Nicholas K2 # 2448

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