I wonder if anyone knows of a project or kit that uses a 'scope
timebase output as the basis of an HF spectrum analyser. My aim is
to make something that would be useful for filter work so I'm not
necessarily looking for very wide frequency sweep.

TIA,


Charlie.

--
M0WYM
www.radiowymsey.org

Sign today!
http://petitions.pm.gov.uk/SaveShortwave/

"M0WYM" wrote in message
...
I wonder if anyone knows of a project or kit that uses a 'scope timebase
output as the basis of an HF spectrum analyser. My aim is to make something
that would be useful for filter work so I'm not necessarily looking for
very wide frequency sweep.
Charlie. M0WYM


My own analyzer was a kit for a QST project sold by
A&A Engineering; the design centered around a CATV
module and had it's own timebase and IF strip/log detector
internally. The analyzer used the scope as a X-Y display.
For serious SSB and CW filter work the VCO is going to
be tricky, you'll need low phase noise, etc.; and a good
set of narrow IF filters that can be swept is another
can of worms. Most of the ham analyzers are better
suited for wider IF responses and wide sweep ranges.
I did a major rework of the IF and Log Amp using an
Analog Devices chip, but the analyzer still has
limitations.

I'd seriously look at some of the DSP receiver kits that
are now on the market--most offer spectrum display
on the computer screen, and adding a good, but
simple, sweep generator might be an easier approach.

Pete

"M0WYM" wrote in message
...
I wonder if anyone knows of a project or kit that uses a 'scope timebase
output as the basis of an HF spectrum analyser. My aim is to make something
that would be useful for filter work so I'm not necessarily looking for
very wide frequency sweep.

TIA,


Charlie.

Hi Charlie,
For very little money, you can buy the miniVNA:
http://www.miniradiosolutions.com/

That will far outplay anything you can build. Because it makes use of a PC,
it will have features well beyond a simple SA + tracking generator. In
addition, it's a vector device.

GL,
Dale W4OP

"Dale Parfitt" wrote in message news:ZCq6l.1994$
Hi Charlie,
For very little money, you can buy the miniVNA:
http://www.miniradiosolutions.com/

That will far outplay anything you can build. Because it makes use of a
PC, it will have features well beyond a simple SA + tracking generator. In
addition, it's a vector device.

GL,
Dale W4OP


Their scalar network analyzer looks awesome too!
There's an amazing lack of "boatanchor" hardware
in these devices.

Dale Parfitt wrote:
SNIP
For very little money, you can buy the miniVNA:
http://www.miniradiosolutions.com/

That will far outplay anything you can build. Because it makes use of a PC,
it will have features well beyond a simple SA + tracking generator. In
addition, it's a vector device.

GL,
Dale W4OP


Dale,

That is neat but it works out as over £200 here (around $300). I
will bear it in mind as it would be great for antenna work using a
laptop.

Thanks,


Charlie.

--
M0WYM
www.radiowymsey.org

Sign today!
http://petitions.pm.gov.uk/SaveShortwave/

Tio Pedro wrote:
SNIP

I'd seriously look at some of the DSP receiver kits that
are now on the market--most offer spectrum display
on the computer screen, and adding a good, but
simple, sweep generator might be an easier approach.

Pete



Pete,

That does sound interesting and pretty inexpensive. You have me
thinking now


Thanks,


Charlie.

--
M0WYM
www.radiowymsey.org

Sign today!
http://petitions.pm.gov.uk/SaveShortwave/

M0WYM wrote:


That is neat but it works out as over £200 here

Just seen an add for it in this months RadCom, Martin Lynch has it
at £259.95 ($426)!


Charlie.

--
M0WYM
www.radiowymsey.org

Sign today!
http://petitions.pm.gov.uk/SaveShortwave/

"Tio Pedro" wrote in message
...

"Dale Parfitt" wrote in message news:ZCq6l.1994$
Hi Charlie,
For very little money, you can buy the miniVNA:
http://www.miniradiosolutions.com/

That will far outplay anything you can build. Because it makes use of a
PC, it will have features well beyond a simple SA + tracking generator.
In addition, it's a vector device.

GL,
Dale W4OP


Their scalar network analyzer looks awesome too!
There's an amazing lack of "boatanchor" hardware
in these devices.
Not even any condensers.

Dale

"M0WYM" wrote in message
...
M0WYM wrote:


That is neat but it works out as over £200 here

Just seen an add for it in this months RadCom, Martin Lynch has it at
£259.95 ($426)!


Charlie.

--
M0WYM

For what it does- that's a great price.
I have $14K in my HP.
Dale

Dale W4OP

Dale Parfitt wrote:
"M0WYM" wrote in message
...
M0WYM wrote:

That is neat but it works out as over £200 here
Just seen an add for it in this months RadCom, Martin Lynch has it at
£259.95 ($426)!


Charlie.

--
M0WYM

For what it does- that's a great price.
I have $14K in my HP.
Dale

Dale W4OP




Wow!

-ex