[linrad] Homebrew I/Q-chains ; KNOPPIX 5.0.1 --- Re: [linrad] Presonus Firebox

['Zaba' OH1ZAA <dlc.fi; zaba@xxxxxxxxxxxxxxxx>]

Sir Roger & all!

Though I have the complete WSE-line here, I am still missing
the proper power supply (-15V/+15V) amperage to fire them up.

On the other side it is fun to build something small from time
to time, so I constructed the low noise I/Q-amplifier according
to SM5BSZ/Leif's Figure 2 in "Linux PC-radio. Optimised direct
conversion receiver for 144 MHz using standard Schottky diode
mixers" [http://www.sm5bsz.com/linuxdsp/hware/optiq.htm].

As it turned out the 2N2222A is an excellent choice for the
input-transistor. I had some 1980's stock, but ON Semiconductor
[http://www.onsemi.com/PowerSolutions/product.do?id=P2N2222A] is
listing this P2N2222A model with plots of noise figures below 1 dB
over a wide range of impedances and bias. I used the RC4136 for
the op-amps, but if you need to steer a Delta 44 to full range
with the 96 kHz setting, then  it may be better to take a NE5532
or a similar type for the output stages, with a higher slew-rate
than the RC4136.

Knoppix 5.0.1 was released June 2d and I installed it to the HD
(after CDR-boot, issue in console: 'knoppix-installer'), as my
previous linux distro had been broken due to a forgotten cause.

With all the wlr2-xx versions of Linrad I had completely lost
contact with the linux versions, and it would be nice to see
a lir2-xx run under X. After 'apt-get update' I got access to
'apt-get install wajig' / 'wajig recommended xlibs-static-dev' /
'wajig recommended automake1.9' command series. However, I still
have problems with make xlinrad and make linrad after ./configure.

There hundreds of errors at the end for both lir2-14 and lir1-37:

/usr/bin/ld.: symbol 'no symbol' missing from main hash table

Also when trying to run .-xlinrad   >>>

Xlib: connection to "0.0" refused by server
Xlib: No protocol specified
can't open display (null)

Ran into similar hash table errors and the helper-module problem
with svgalib 1.9.24 and lir01-37 .... due to the linux break I
have to study again the helper module bypass in libvga.config if
that was the latest trick to avoid the issue (my memory fails).

                              73, "Zaba"  OH1ZAA/2


At 14:09 1.6.2006, W3SZ wrote:

> Hello, All,
>
> This is just a followup note to let you know that the problem I am having
> with the Presonus Firebox [it is not able to show more than a 48 kHz swath
> of spectrum even with sampling at 96 kHz and quadrature detection] is a
> 'recognized issue'.
>
> It is apparently due to a firmware bug.  Presonus' first attempt at a bug
> fix apparently caused more serious problems with the unit.
>
> I am told they are working on another fix.
>
> I will let the groups know if/when a satisfactory resolution appears.
>
> Until then, the Presonus Firebox is NOT a suitable device if you want to
> sample a swath of spectrum wider than 48 kHz, as it simply won't do it.
>
> 73,
>
> Roger Rehr
> W3SZ
>
> --
> Roger Rehr
> W3SZ
> http://www.nitehawk.com/w3sz/


#############################################################
This message is sent to you because you are subscribed to
 the mailing list <linrad@xxxxxxxxxxxxxxxxxxxxx>.
To unsubscribe, E-mail to: <linrad-off@xxxxxxxxxxxxxxxxxxxxx>
To switch to the DIGEST mode, E-mail to <linrad-digest@xxxxxxxxxxxxxxxxxxxxx>
To switch to the INDEX mode, E-mail to <linrad-index@xxxxxxxxxxxxxxxxxxxxx>
Send administrative queries to  <linrad-request@xxxxxxxxxxxxxxxxxxxxx>


LINRADDARNIL