"G "Guglielmo" Evans G4SDW" wrote in message
...
mirrorbow is not a bona-fide operation and does not advertise its
address, directors and other information as now required
by UK law.

That is a little odd. Any idea why they aren't more forthcoming?

"G "Guglielmo" Evans GW4SDW" wrote in message
...
Does anyone have experience and/or recommendations
for analogue and digital I/O interfaces based on the Universal
Serial Bus (USB)?

Just an idea for the genesis of a homebrew spectrum analyser.

Next consideration....not having to hand any components or
experience of the broadcast TV band (0.4 - 1GHz?) I wonder
what tuners and mixers are fitted to modern TVs and if anyone
can recommend a tuner separate from a main board that
might be used.

Also, where tuners are driven by I2C and similar busses, are
they channelised to fit the standard TV channels, or do they
have a delta frequency, say, 10kHz, that might be useful
for a spectrum analyser?

"G "Guglielmo" Evans G4SDW" wrote in message
...

"G "Guglielmo" Evans GW4SDW" wrote in message
...
Does anyone have experience and/or recommendations
for analogue and digital I/O interfaces based on the Universal
Serial Bus (USB)?

Just an idea for the genesis of a homebrew spectrum analyser.

Next consideration....not having to hand any components or
experience of the broadcast TV band (0.4 - 1GHz?) I wonder
what tuners and mixers are fitted to modern TVs and if anyone
can recommend a tuner separate from a main board that
might be used.

Also, where tuners are driven by I2C and similar busses, are
they channelised to fit the standard TV channels, or do they
have a delta frequency, say, 10kHz, that might be useful
for a spectrum analyser?

Maybe you could look at tuner boards form an old VCR, On VCR's Circa 1990
the tuners were a separate board, Older tuners were simply fed by a PWM
output from the display / timer CPU that was then fed to an amplifier/
smoothing stage that then gave a 36V down to 2V DC voltage to select
frequency, they were analogue tuners, so not stepped, there was usually
another line to the tuner to disable the AFT lock that was used when
scanning for new channels.
We used to take the VCR tuner board, put it in a box with a PSU, pin the
AFT lock line to 5V to disable AFT then use a 10K pot with a 2K or 3K
fixed R on the 0V leg, the wiper to the collector of the transistor that was
after the PWM input line.
The modules used in the VCR's were usually Mitsumi or Alps, and if you get
hold of an European one. then you can tune VHF and UHF with it, but you will
need to apply 5V to the band switching pins on the tuner. and yes it can be
used as a basic spectrum analyser, but you may have to find a way to disable
the AGC circuits.
Also the tuner boards rely on the RF output modulator / pass though unit on
the back sockets of the VCR having considerable gain, without the
modulator, the signal would be weak.

On Jul 30, 6:05 pm, "Joel Kolstad"
wrote:
"G "Guglielmo" Evans G4SDW" wrote in ...

mirrorbow is not a bona-fide operation and does not advertise its
address, directors and other information as now required
by UK law.

That is a little odd. Any idea why they aren't more forthcoming?

I received both the boards I ordered from Mirrorbow in a few days and
all my email enquiries were answered extremely quickly and
thoroughly. I guess they are not a multinational, and Ive never had
cause to ring them. However, payment is via Palpal which I believe
offer a degree of protection anyway. My invoice on delivery had their
address on it.

There are lots of companies online that dont show addresses or phone
numbers online, so I cant believe it is illegal not listing them!
Otherwise all those webspace providers would be breaking the rules!

I think its a silly to post a comment stating that they are not "bona-
fide" unless you can post evidence to suggest this.

Twice I sent my money via paypal, and twice I received my board
quickly and it worked to spec. I had questions, and they were
answered on email.

If we expect every company we deal with as amatuer electronics
enthusiasts to have a call centre and list streams of directors I
think we would find them thin on the ground in our specialist area!

On Jul 30, 6:05 pm, "Joel Kolstad"
wrote:
"G "Guglielmo" Evans G4SDW" wrote in ...

mirrorbow is not a bona-fide operation and does not advertise its
address, directors and other information as now required
by UK law.

That is a little odd. Any idea why they aren't more forthcoming?

Oh, by the way, I found them through a magazine article written by a
Davy Dick in a publication called MERG. Which is a model railway
magazine (don't ask!). He's a railway enthusiast and the article was
about using the board for controlling model railways, I don't think he
has any association with the company.

"bigorangebus" wrote in message
oups.com...
There are lots of companies online that dont show addresses or phone
numbers online, so I cant believe it is illegal not listing them!
Otherwise all those webspace providers would be breaking the rules!

I think its a silly to post a comment stating that they are not "bona-
fide" unless you can post evidence to suggest this.

The evidence is their web site which does not comply with UK law
as to revealing the business address and names of directors.

on 05/08/2007 16:27 bigorangebus said the following:

If we expect every company we deal with as amatuer electronics
enthusiasts to have a call centre and list streams of directors I
think we would find them thin on the ground in our specialist area!

and VERY expensive!
--
;-)
73 de Frank Turner-Smith G3VKI - mine's a pint.
http://turner-smith.co.uk

On Aug 5, 4:59 pm, "G \"Guglielmo\" Evans G4SDW"
wrote:
"bigorangebus" wrote in message

oups.com...

There are lots of companies online that dont show addresses or phone
numbers online, so I cant believe it is illegal not listing them!
Otherwise all those webspace providers would be breaking the rules!

I think its a silly to post a comment stating that they are not "bona-
fide" unless you can post evidence to suggest this.

The evidence is their web site which does not comply with UK law
as to revealing the business address and names of directors.

Do you have a web link to information on this requirement? I'm
curious.

How do businesses operate that are partnerships or sole traders? It
is not a requirement for a business in the UK to have directors, so
how can they all be required to show them. You're suggesting you have
to be a limited company (they have directors) to trade on the net....

On Aug 6, 5:23 pm, bigorangebus wrote:

Do you have a web link to information on this requirement? I'm
curious.

http://preview.tinyurl.com/2fbnzy

David

"David Powell" wrote in message
ups.com...
On Aug 6, 5:23 pm, bigorangebus wrote:

Do you have a web link to information on this requirement? I'm
curious.

http://preview.tinyurl.com/2fbnzy

That applies to limited companies and partnerships. Not sole trader
concerns.



David