3 My name is Leif, SM5BSZ and I am one of those still designing and building all
4 the radio equipment for my hobby. I just found out that Amrad exists, and I find
5 perhaps here is a group of people sharing my technical interest.
7 My activity is in design of highly optimised gear for VHF, and I think I have
8 shown what can be done by results in the EME contests. I am using a very small
9 system, only 4x14 elements on 144MHz, and in recent years I have achieved places
10 1 to 4 in the world wide contests with an antenna size (in element count) among
13 The way to reach good contest results is partly to use a DSP to produce a
14 receive system that is adaptive to the incoming wave both in filtering and
15 linear combining the signal pair from a cross yagi system.
17 The reason I write to you now is the link "DSP/software radios" (I was denied
18 access). Maybe others are working on similar things, and would have an interest
19 in the algorithms I have been using. My software is written for the particular
20 hardware I have, with a TMS320c25, so the actual source code is not of much
21 value but the general strategy might be ?
23 I have placed all information on the internet at:
25 <a href="http://ham.te.hik.se/homepage/sm5bsz/index.htm">http://ham.te.hik.se/homepage/sm5bsz/index.htm</a>
27 Today, the standard desktop computer has an audio board, and processing power
28 enough to do all the job, so it should be fairly easy to lift the weak signal
29 receive capability for great many amateurs just by making some software
32 I think I have most of what is needed, and I will make it available in both
33 source code and as executable files on the internet free for anyone and for any
34 purpose. But only if I can get from somewhere the drive routines that are
35 necessary to use the standard audio boards that people generally use with their
38 What I need is some software that will control the sound blaster (clone) and
39 that will issue an interrupt every time N new samples are made available in a
40 buffer. The software should also read the wave I store in a circular buffer and
41 send it to the loudspeaker.
43 I do not know the policy of amrad and its members, my own is that everything I
44 do is free to use for everybody who wants. I know the kind of drivers I need are
45 around, and they are used in amateur written software.
47 So, besides telling about my home page, this E-mail is a question: Is there
48 within Amrad, or among its members some software that would solve the "sound
49 blaster drive routine" problem - and my interest is only in softwares that can
50 be made public and free to use by anyone who likes to do so.