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/

"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

M0WYM wrote:

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.

That's a pretty good price, but if you're prepared to import it yourself, you
can save some money. My HP and Avantek SAs cost over £35000 together!

Bob

Dale Parfitt wrote:


"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

You could build a N2PK VNA which is pretty accurate.

Chris

On Dec 30, 8:08*am, M0WYM wrote:
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.

For filter work, I think you probably want a "sweep generator", not a
"spectrum analyzer". Many of the elements are the same but a sweep
generator is a far less ambitious project that is probably what you
want for alignments and filter design.

Tim N3QE

"Tim Shoppa" wrote in message
...
Charlie.

For filter work, I think you probably want a "sweep generator", not a
"spectrum analyzer". Many of the elements are the same but a sweep
generator is a far less ambitious project that is probably what you
want for alignments and filter design.

Tim N3QE

I would think a good SA with a tracking generator would be
cat's meow. I wonder how a flat noise source would work
in lieu of the TG to plot filter responses on a SA?

In message , Tio Pedro
writes

"Tim Shoppa" wrote in message
...
Charlie.

For filter work, I think you probably want a "sweep generator", not a
"spectrum analyzer". Many of the elements are the same but a sweep
generator is a far less ambitious project that is probably what you
want for alignments and filter design.

Tim N3QE

I would think a good SA with a tracking generator would be
cat's meow. I wonder how a flat noise source would work
in lieu of the TG to plot filter responses on a SA?

A flat noise generator does indeed work well as a wideband signal
source. However, to make sense of the trace, the spectrum analyser needs
a lot of lowpass filtering of the signal (after detection). This is
averages the spiky noise signal. Most modern digital analysers do have
an 'averaging' function but, on the older 'analogue' analysers,
filtering works fine. You would normally the maximum filtering possible
- typically 100 or 30Hz.
--
Ian

On Dec 30, 4:39*pm, "Tio Pedro" wrote:
"TimShoppa" wrote in message

...
* Charlie.

For filter work, I think you probably want a "sweep generator", not a
"spectrum analyzer". Many of the elements are the same but a sweep
generator is a far less ambitious project that is probably what you
want for alignments and filter design.

Tim N3QE

I would think a good SA with a tracking generator would be
cat's meow.

Well, yeah, if you can swing it. But a sweep generator is more than
sufficient for filter design and alignments. And every decent radio/TV
repair shop had one already meaning they show up really really cheap
on E-bay or hamfests a lot. Or you can homebrew a sweep generator (see
EMRFD or a ARRL handbook) out of junk box parts for your particular
band of interest.

Tim N3QE

On Dec 30 2008, 8:08 am, M0WYM wrote:
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.

--
M0WYMwww.radiowymsey.org

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

Hey OM
In the old analog TV days I used a cable ready varactor tuner as a
sweep generator to drive the scope and MAKE it a spectrum analyzer.
All you needed was a ramp voltage to sweep the varactor tuning with.
Nowadays I could use a transceiver hooked up to a computer and use
digipan or ham radio deluxe to do that.

73 OM
n8zu