[hpsdr] Problems with Ozi. (Willi Reppel)

[Willi Reppel]

Hi Bill and Gerd,

Thanks for your replies. In the meanwhile I came myself to the conclusion 
that something is wrong with the keyer´s  input. Ozi functions correctly in 
receive mode when the jambic keyer is not connected to Ozi´s DB9 contact. 
However,  Ozi autostarts by itself to send a continuous series of dots 10-20 
seconds after I connect the jambic keyer to Ozi. It even continues to send 
dots for some seconds after disconnecting the keyer.
I hesitate to put questions forward here on the reflector because in most 
cases it turns out that the answers are buried somewhere in the manuals or 
previous discussions.
I am glad to hear that this problem is caused by a faulty MOS transistor and 
not by my shortcomings.

vy 73 de
SM6OMH  Willi


----- Original Message ----- 
From: "Gerd Loch" <g.loch at nt-electronics.de>
To: <hpsdr at lists.hpsdr.org>
Cc: <wi.re at telia.com>
Sent: Friday, March 13, 2009 2:52 PM
Subject: Problems with Ozi. (Willi Reppel)


Hi Willi,

I suppose that the transistor 2N7002 which switches PTT is defect.
You can easily measure at B,E,C. if you measure a low resistance between the
pins and no difference which polarisation you choose then you have to
exchange it. (Right bottom corner of the board).

73, Gerd
DJ8AY



Hej all,
I have two Ozi boards and one of them does not perform as intended. When
starting up HPSDR it always goes immediately into transmit mode while the
other Ozi work normal and never starts in transmit mode. Has anybody an idea
what may cause this problem? Otherwise I am very pleased with my HPSDR rig
consisting of Atlas, Ozi, Penny and Mercury, connected to a PA module for an
Icom 750  which a dealer here in Sweden had in stock as spare part. The Icom
module?s bandpass filters and PTT are interfaced to and controlled by
Penny?s seven open collector outputs.

vy 73
SM6OMH  Willi

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