non-standard anaylser reqd

I could do with a spectrum analyser designed primarily for communications
signals and broadcast radio rather than broadcast TV. Ideally it would cover
30 to 470MHz, with the ability to display a very narrow bandwidth, say 1 or
2MHz. Measurement bandwidth to be adjustable down to a very low figure. The
ability to demodulate NBFM, broadcast FM, DAB and AM. Amongst other things I
want to be able to look at a small portion of the FM broadcast band and
differentiate between signals on adjacent channels.

Any ideas for suitable gear?

Bill

"Bill Wright" wrote in message
...
I could do with a spectrum analyser designed primarily for
communications signals and broadcast radio rather than broadcast
TV. Ideally it would cover 30 to 470MHz, with the ability to
display a very narrow bandwidth, say 1 or 2MHz. Measurement
bandwidth to be adjustable down to a very low figure. The
ability to demodulate NBFM, broadcast FM, DAB and AM. Amongst
other things I want to be able to look at a small portion of the
FM broadcast band and differentiate between signals on adjacent
channels.

Any ideas for suitable gear?

Bill



Can you clarify on that Bill.

Do you want it to display 30-470 MHz all of the time, or just a
portion of it?

When you say bandwidth do you mean you want to be able to look at
a 1MHz section or 2MHz section of spectrum in the 30-470MHz band,
or do you want it to have a filter that looks at the portion you
need and ignores everything else?

These should not be a problem for any spec-an albeit possibly at
a price. Getting one that will demodulate broadcast is a
different kettle of fish. A spec-an is a device for looking at
spectrum but not viewing or listening to it. There will be
devices around that will do it or that can have add-ons that do
but I would suspect by then you could be pushing five figures (in
front of the decimal point!)



--
Woody

harrogate three at ntlworld dot com

"Woody" wrote in message
...
"Bill Wright" wrote in message
...
Do you want it to display 30-470 MHz all of the time, or just a portion of
it?
Just a portion.

When you say bandwidth do you mean you want to be able to look at a 1MHz
section or 2MHz section of spectrum in the 30-470MHz band,
Yes

These should not be a problem for any spec-an albeit possibly at a price.
Getting one that will demodulate broadcast is a different kettle of fish.
A spec-an is a device for looking at spectrum but not viewing or listening
to it.
Yes, I was wondering if there was anything on the market designed for people
in the mobile comms industry, where a good clear view of a small area of
spectrum and the ability to demodulate the signal (if analogue audio) would
be useful. The equivalent of the type of analyser used for RF distribution
systems, in fact.

There will be devices around that will do it or that can have add-ons that
do but I would suspect by then you could be pushing five figures (in front
of the decimal point!)
Oh dear.

Bill

On Oct 22, 7:19*pm, "Bill Wright"
wrote:
"Woody" wrote in message

... "Bill Wright" wrote in message
.. .
Do you want it to display 30-470 MHz all of the time, or just a portion of
it?
Just a portion.

When you say bandwidth do you mean you want to be able to look at a 1MHz
section or 2MHz section of spectrum in the 30-470MHz band,

Yes

These should not be a problem for any spec-an albeit possibly at a price.
Getting one that will demodulate broadcast is a different kettle of fish.
A spec-an is a device for looking at spectrum but not viewing or listening
to it.

Yes, I was wondering if there was anything on the market designed for people
in the mobile comms industry, where a good clear view of a small area of
spectrum and the ability to demodulate the signal (if analogue audio) would
be useful. The equivalent of the type of analyser used for RF distribution
systems, in fact.

There will be devices around that will do it or that can have add-ons that
do but I would suspect by then you could be pushing five figures (in front
of the decimal point!)

Oh dear.

Bill

As a mobile comms. person I'd use a Rohde and Schwarz FSIQ for that
sort of thing - not sure if it has an option for Band 2 FM and
suchlike, I'm using it for GSM and 3G cellular. Definately in the five
digit price range though :-/, although they're getting on a bit now.

http://www.livingston-products.com/p...11046_2_en.pdf

.. I'm wondering if one of the PC based rectum paralyser cards would do
the job, will try and have a look later.

In message , Bill Wright
writes


There will be devices around that will do it or that can have add-ons that
do but I would suspect by then you could be pushing five figures (in front
of the decimal point!)
Oh dear.
Somewhere like Stewart of Reading will have plenty that might meet your
needs second hand. Still not pocket money cheap but worth a phone call
perhaps.

Alternatively, you can hire them if it's for a one off job.

Bill



--
Clint Sharp

Well one could always get a second hand ham receiver with computer interface
and use a laptop to show the spectrum.
Brian

--
Brian Gaff -
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"Woody" wrote in message
...
"Bill Wright" wrote in message
...
I could do with a spectrum analyser designed primarily for communications
signals and broadcast radio rather than broadcast TV. Ideally it would
cover 30 to 470MHz, with the ability to display a very narrow bandwidth,
say 1 or 2MHz. Measurement bandwidth to be adjustable down to a very low
figure. The ability to demodulate NBFM, broadcast FM, DAB and AM. Amongst
other things I want to be able to look at a small portion of the FM
broadcast band and differentiate between signals on adjacent channels.

Any ideas for suitable gear?

Bill



Can you clarify on that Bill.

Do you want it to display 30-470 MHz all of the time, or just a portion of
it?

When you say bandwidth do you mean you want to be able to look at a 1MHz
section or 2MHz section of spectrum in the 30-470MHz band, or do you want
it to have a filter that looks at the portion you need and ignores
everything else?

These should not be a problem for any spec-an albeit possibly at a price.
Getting one that will demodulate broadcast is a different kettle of fish.
A spec-an is a device for looking at spectrum but not viewing or listening
to it. There will be devices around that will do it or that can have
add-ons that do but I would suspect by then you could be pushing five
figures (in front of the decimal point!)



--
Woody

harrogate three at ntlworld dot com

On Oct 22, 9:38*pm, airsmoothed wrote:
On Oct 22, 7:19*pm, "Bill Wright"
wrote:



"Woody" wrote in message

... "Bill Wright" wrote in message
.. .
Do you want it to display 30-470 MHz all of the time, or just a portion of
it?
Just a portion.

When you say bandwidth do you mean you want to be able to look at a 1MHz
section or 2MHz section of spectrum in the 30-470MHz band,

Yes

These should not be a problem for any spec-an albeit possibly at a price.
Getting one that will demodulate broadcast is a different kettle of fish.
A spec-an is a device for looking at spectrum but not viewing or listening
to it.

Yes, I was wondering if there was anything on the market designed for people
in the mobile comms industry, where a good clear view of a small area of
spectrum and the ability to demodulate the signal (if analogue audio) would
be useful. The equivalent of the type of analyser used for RF distribution
systems, in fact.

There will be devices around that will do it or that can have add-ons that
do but I would suspect by then you could be pushing five figures (in front
of the decimal point!)

Oh dear.

Bill

As a mobile comms. person I'd use a Rohde and Schwarz FSIQ for that
sort of thing - not sure if it has an option for Band 2 FM and
suchlike, I'm using it for GSM and 3G cellular. Definately in the five
digit price range though :-/, although they're getting on a bit now.

http://www.livingston-products.com/p...11046_2_en.pdf

. I'm wondering if one of the PC based rectum paralyser cards would do
the job, will try and have a look later.

For Bill one of these might be more appropriate:

http://www2.rohde-schwarz.com/en/pro...ers/PR100.html

Has the advantage of being easily portable (battery/mains operation)
and will be a good deal less expensive than the FSIQ. Quite possibly
overkill for the application though - it has a *much* wider frequency
range 9kHz 7.5GHz and is probably more accurate than needed too (I'm
guessing Bill will be more interested in relative level measurements
rather than high accuracy absolute measurements).

Depending on the exact requirements a good secondhand general purpose
analyser might be more cost effective (Stewart of Reading being a good
place to try).

Just one note - typically RF inputs on 'lab' test gear are going to be
50Ohm not 75Ohm

"Brian Gaff" wrote in message
...
Well one could always get a second hand ham receiver with computer
interface and use a laptop to show the spectrum.
Brian

That could be a cheap solution, although I'd need help to do it, since I
know nothing of such things.

Bill

"Simon" wrote in message
...
On Oct 22, 9:38 pm, airsmoothed wrote:
On Oct 22, 7:19 pm, "Bill Wright"
wrote:
Has the advantage of being easily portable (battery/mains operation)
and will be a good deal less expensive than the FSIQ. Quite possibly
overkill for the application though - it has a *much* wider frequency
range 9kHz 7.5GHz and is probably more accurate than needed too (I'm
guessing Bill will be more interested in relative level measurements
rather than high accuracy absolute measurements).

Depending on the exact requirements a good secondhand general purpose
analyser might be more cost effective (Stewart of Reading being a good
place to try).

Just one note - typically RF inputs on 'lab' test gear are going to be
50Ohm not 75Ohm

I've sent off a sales enquiry re this item. 50ohm is no problem, since it's
mostly for RBL aerials etc and they are 50ohm.

Thanks.

Bill

"Simon" wrote in message
...
On Oct 22, 9:38 pm, airsmoothed wrote:
On Oct 22, 7:19 pm, "Bill Wright"
wrote:
Depending on the exact requirements a good secondhand general purpose
analyser might be more cost effective (Stewart of Reading being a good
place to try).

I've enquired with Stewarts.

Bill