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w3sz | 1 May 01:52
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Fwd: [softrock40] Ver 7 28Mhz preamp? Yes

Hi, All,

Just a note for those interested in using the SoftRock v7.0 as a backend  
for transverters, forwarded from the Yahoo Softrock group.

Unfortunately, he didn't provide details on what his system actually was.   
But it is still some information ;)

As always, ymmv.

I hope to start receiving my SoftRocks late this week or early next week,  
and then should have some reports for all.

73,

Roger
W3SZ

------- Forwarded message -------
From: pxxxxxxxxis <bxxxx <at> xxxxxxx>
To: softrock40@...
Subject: [softrock40] Ver 7 28Mhz preamp? Yes
Date: Sun, 30 Apr 2006 19:07:48 -0400

    This morning I was using the Ver7 with my 28/144Mhz receive
converter for a receive IF on 10Ghz rain scatter. I tried the system
WITHOUT the 28Mhz preamp I have been using. I could see nothing but a
few spikes in the 96Khz range. Added the 28Mhz preamp again and the
9-10db 10Ghz rainscatter signal from W0GHZ was easly seen. .... 28Mhz
preamp REQUIRED for my system!
(Continue reading)

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Giancarlo Moda | 1 May 10:24
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Re: Fwd: [softrock40] Ver 7 28Mhz preamp? Yes

Hi all,

the preamplifier at 28MHz is required when the VHF-SHF
converter has a low gain and its output is designed
for a higher gain IF like the one used in Linrad HDW
or others.

I would suggest to add the W7AAZ preamplifier using
4xJfet in parallel, as used in the CDG2000 and
Pic-A-STAR. This preamplifier has a very low noise
(expected below 2dB)and another important aspect: The
output impedance changes are no reflected to the input
like for the Norton amplifier. It also has a high IIP3
(>+35dBm).

You may visit: http://www.warc.org.uk/ and look for
the CDG2000 project.

73

Gian
I7SWX

--- w3sz <w3sz@...> wrote:

> Hi, All,
> 
> Just a note for those interested in using the
> SoftRock v7.0 as a backend  
> for transverters, forwarded from the Yahoo Softrock
(Continue reading)

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w3sz | 1 May 13:03
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Re: Fwd: [softrock40] Ver 7 28Mhz preamp? Yes

This looks very nice, Gian!

As an inexpensive and easy-to-obtain choice, I have used the LNA module,  
set up for 28 MHz,  from the R2Pro by KK7B.  It is available from Kanga  
Kits.

http://www.bright.net/~kanga/kanga/KK7B/r2pro.htm here in the USA.

It is only $12.

I have a couple of them in use at my shack in front of my RF-to-baseband  
converters [not SoftRocks yet...they should arrive soon] for a couple of  
years and they seem to work well also.

THanks for the excellent tip, and

73,

Roger
W3SZ

On Mon, 01 May 2006 04:24:36 -0400, Giancarlo Moda <i7swx@...> wrote:

> Hi all,
>
> the preamplifier at 28MHz is required when the VHF-SHF
> converter has a low gain and its output is designed
> for a higher gain IF like the one used in Linrad HDW
> or others.
>
(Continue reading)

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Leif Asbrink | 1 May 21:23

Bug reports 02-08

Hi All,

If you have detected bugs in Linrad-02.08 and
not seen any reference to your problem on this list,
please send a bug report now.

I am testing Linrad-02.09 on various systems
and 02.08 bugs reported within the next 24 hours
will (hopefully) be corrected in 02-09.

73

Leif  /  SM5BSZ

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w3sz | 2 May 12:39
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Fwd: Softrock as part of VHF receive chain

Hi, All,

RE: the recent threads on using Softrocks as part of the receive chain; in  
the latest EME Newsletter for 432 and up it is noted that Dave Robinson,  
WW2R, is using a SoftRock 7 as part of his receive chain for
1296 MHz EME.  Here is the post.  I posted the whole thing so you can get  
a sense of things:

WW2R: Dave rxxxxxx@... is now QRV on 13 cm as well as 23 cm - On 1  
April I built a 13 cm VE4MA superfeed with tubing donated/shipped by  
PA3CSG - TNX. On 2 April I had a sked with VE6TA at 1700 but my DB6NT  
xverter broke twice. We eventually worked at 2000 for initial #1. During  
the week I changed preamps to a WD5AGO style and changed the  
relay/adaptors, lowering the system NF by 0.35 dB. On 8 April I operated  
the DUBUS contest. Exceptionally loud signals were heard and my echoes  
copied 2 dB over the noise. I worked OK1CA, F2TU, W5LUA and OK1KIR. CWNR  
were ES5PC and HB9JAW. On 9 April signals weaker and no echoes copied.  
OK1CA seemed down by 10 dB. I CWNR HB9SV, OE9ERC (2 hours) and SK0UX (1  
hour). I also heard but did not QSO WA6PY. I did work OZ4MM (weaker) and  
G3LTF crossband on sked.

Using my softrock 7 RX, I simultaneously monitored 2320 and 2304 all  
weekend. G3LTF was the only signal identified on 2320.

I also listened on 2424 during JA window, but heard nothing. On 11 April I  
worked OE9ERC for initial #8 (17 dB over the noise) on a sked on both CW  
and SSB. Echoes were 1 dB over the noise at this time. On 12 April I  
received nil on sked with NA4N, and heard WD5AGO on sked but did not  
complete. I have my 23 cm feed back in the dish in preparation for May  
contest activity. I have also stared work on a 3456 system.
(Continue reading)

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Leif Asbrink | 2 May 21:23

Linrad-02.09

Hi All,

Linrad-02.09 can use the parallel port thanks to the 
inpout32.dll that Roger pointed me to.

After having found out how to access a dll file I 
also added support for the SDR-14 hardware in the
Windows version.

To make the port of Linrad to Microsoft complete I
need help with the following things:

1) How to read 32 bit audio from Delta44, Lynx Two
and others? Are there dll files one can use?

2) How to get the CPU load caused by Linrad? When it
matters (on my 200 MHz MMX for example) the system 
monitor takes far too much resources and causes 
glitches in the Linrad output. Someone might have 
made a publicly available dll - but I do not know 
how to find it.

3) How to prevent Linrad from being swapped onto the
hard disk?

4) How to get random numbers? "random()" under Linux.

5) Linrad now gets the time of day to write in the 
waterfalls, but to make the moon position calculator 
work Linrad needs Epoch seconds. In case it is not
(Continue reading)

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'Zaba' OH1ZAA | 2 May 22:18
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Error 1210 ... Re: [linrad] Linrad-02.09


Thanks Leif!

Former versions of Linrad (wlr2.0x) all started well, but 2.09
complains about an INTERNAL ERROR 1210 ...  [1210]lir setpixel
(x,y, color) called with point outside screen.

Thanks for the great effort & splendid progress!

                               73, "Zaba"  OH1ZAA

At 22:23 2.5.2006, SM5BSZ wrote:

>Hi All,
>
>Linrad-02.09 can use the parallel port thanks to the
>inpout32.dll that Roger pointed me to.
>
>After having found out how to access a dll file I
>also added support for the SDR-14 hardware in the
>Windows version.
>
>To make the port of Linrad to Microsoft complete I
>need help with the following things:
>
>1) How to read 32 bit audio from Delta44, Lynx Two
>and others? Are there dll files one can use?
>
>2) How to get the CPU load caused by Linrad? When it
>matters (on my 200 MHz MMX for example) the system
(Continue reading)

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Leif Asbrink | 3 May 00:45

Re: Error 1210 ... Re: [linrad] Linrad-02.09

Hi Zaba,

Please save all par files first so there is no risk that
you can not reproduce this bug. Then copy the par_wcw
or whatever mode causing the problem from an earlier
version that was ok. For par_userint, use a text editor
to make the 09 parameters equal to the ones previously 
used.

In case the bug disappears, try to put the 09 files back 
one by one until you know which one causes the problem.

Then pack the par files for the mode causing the problem
as well as par_userint and send to me. I must be able 
to reproduce the error to see from where the call to 
setpixel was made.

73

Leif

> 
> Thanks Leif!
> 
> Former versions of Linrad (wlr2.0x) all started well, but 2.09
> complains about an INTERNAL ERROR 1210 ...  [1210]lir setpixel
> (x,y, color) called with point outside screen.
> 
> Thanks for the great effort & splendid progress!
>
(Continue reading)

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Leif Asbrink | 3 May 14:35

Restrictions on 02-09

The bug reported by Zaba (pixels outside screen)
is present regardless of operating system. 

Linrad-02.09 does not allow an expanded X-scale in
the baseband graph. As a work-around, edit your
file(s) par_xxx_bg and set pixels/point to 1.

73

Leif / SM5BSZ

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Leif Asbrink | 3 May 16:09

Bug reports wanted

Hi All,

The bug in 02-09 that does not allow expanded
X-scales in the baseband graph is corrected. 
I made a silly mistake when putting back yellow 
dots that were cleared when the BFO was moved 
across the filter curve. (And forgot to test 
this "improvement" in an expanded X scale...)

Before uploading Linrad-02.10 (probably late tonight)
I would like to know if someone has seen any 
other problems with 02-09.

73

Leif / SM5BSZ

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Gmane