Updates

[leif.asbrink@xxxxxxxxxxxxxxxx>]

Merry Christmas to All!

There are some new updates on the Linrad site now.
Below is a list of recent changes.


73

Leif  /  SM5BSZ





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Dec 26 2002

117 Linrad                                /dsp/linrad.htm
    | |
73  | The LINUX PC-radio for Intel  /linuxdsp/linroot.htm
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190 | Blanker performance         /linuxdsp/rxiq/demo/blanker.htm
    | | Fig. 1. Smart blanker     /linuxdsp/rxiq/demo/difference.gif
    | | Fig. 2. F response uncal  /linuxdsp/rxiq/demo/scale.gif
    | | Fig. 2. F response uncal  /linuxdsp/rxiq/demo/s_uncal.gif
    | | par.tbz                   /linuxdsp/rxiq/demo/par.tbz
    | | Fig. 3. F response cal    /linuxdsp/rxiq/demo/scale.gif
    | | Fig. 3. F response cal    /linuxdsp/rxiq/demo/s_cal.gif
    | | Fig. 4. P response 0.0019 /linuxdsp/rxiq/demo/a_uncal.gif
    | | Fig. 4. P response 0.0019 /linuxdsp/rxiq/demo/a_cal.gif
    | | Fig. 5. P response 0.0312 /linuxdsp/rxiq/demo/b_uncal.gif
    | | Fig. 5. P response 0.0312 /linuxdsp/rxiq/demo/b_cal.gif
    | | Fig. 6. Strong and weak off  /linuxdsp/rxiq/demo/nopul.gif
    | | Fig. 7. Strong and weak on   /linuxdsp/rxiq/demo/both.gif
    | | Fig. 8. When the blanker     /linuxdsp/rxiq/demo/off.gif

Some screen dumps showing noise blanking with RX2500.
A calibration file, par_wcw_corr can be downloaded from here.
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Dec 26 2002

73  | The LINUX PC-radio for Intel  /linuxdsp/linroot.htm
    | | |
    | | lir00-50.tgz                /linuxdsp/archive/lir00-50.tgz
    | | lir00-50.tbz                /linuxdsp/archive/lir00-50.tbz

A new version. Blanker improvements and bug corrections.
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Dec 18 2002

181 | | RX70, the 70 to 10.7 MHz converter     /linuxdsp/rx70/rx70.htm
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182 | | | details of the local oscillator      /linuxdsp/rx70/osc.htm
    | | | | | 
    | | | | Fig. 1 (59 MHz oscillator)         /linuxdsp/rx70/osc70.gif
    | | | | Fig. 2 Frequency control           /linuxdsp/rx70/cntrl70.gif
    | | | | Fig. 3 A stable signal             /linuxdsp/rx70/warmup70.gif
    | | | | Fig. 4 A stable signal             /linuxdsp/rx70/stab70.gif

The local oscillator of the RX70 unit is changed.
It now has an amplitude limiter which improves short term frequency stability.
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Dec 18 2002

171 | | RX10700, the 10.7 to 2.5MHz ...  /linuxdsp/rx10700/rx10700.htm
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172 | | | details of the local oscillator  /linuxdsp/rx10700/osc.htm
    | | | | |
    | | | | Fig.1 Schematic diagram        /linuxdsp/rx10700/osc107.gif
    | | | | Fig.2 Frequency control        /linuxdsp/rx10700/cntrl.gif
    | | | | Fig.3.Frequency stability      /linuxdsp/rx10700/stab107.gif

The local oscillator of the RX10700 unit is changed.
It now has an amplitude limiter which improves short term frequency stability.
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Dec 18 2002

130 | | RX2500, the 2.5MHz to audio  /linuxdsp/rxiq/opt2500.htm
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133 | | | details of the low noise       /linuxdsp/rxiq/osc.htm
    | | | | |
187 | | | | state of the art crystal       /linuxdsp/hware/lotest.htm
    | | | | Fig. 1 Details of the crystal  /linuxdsp/rxiq/osc.gif
    | | | | Fig. 2 Close in spectrum X-tal      /linuxdsp/rxiq/narr25a.gif
    | | | | Fig. 3 Close in spectrum HP         /linuxdsp/rxiq/narr25b.gif
    | | | | Fig. 4 Full spectrum X-tal          /linuxdsp/rxiq/wide25a.gif
    | | | | Fig. 5 Full spectrum HP             /linuxdsp/rxiq/wide25b.gif
    | | | | Fig. 6 Frequency stability          /linuxdsp/rxiq/stab25.gif

The text (133) is rewritten to make clear that the oscillator at
2.5 MHz is designed for a low level of the flat noise floor
and that it does not have good performance with respect to
flicker noise. It is fine for the purpose but VHF oscillators
needed to convert from amateur bands to 70 MHz and from
70 MHz to 2.5 MHz have to be more carefully designed.
Low noise close to the carrier does not necessarily implicate low
noise at large frequency separations or vice versa. 
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Dec 1 2002

188 | | | step by step description   /linuxdsp/hware/d44step.htm
    | | | | |
    | | | | High resolution image    /linuxdsp/hware/d44big1.jpg

A step by step description of Delta 44 modifications is added.
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