On Sun, 02 May 2004 22:37:28 GMT, (John Crighton)
wrote:

Go on, tell us the model number, there are a lot of us
still interested in boat anchor style test equipment.

Is this unit similar to your sig gen
http://www.thevalvepage.com/testeq/avo/sg3/sg3.htm
http://www.thevalvepage.com/testeq/testeq.htm
Unfotunately the connector has been removed and a
BNC type fitted.

Not really similar to any of them, I'm afraid. Model number is CT
378B. I did recognise that old Advance E2, though. Had one of 'em
about 25 years ago. It was pretty ancient then!

I am guessing that you want to keep the original connector
on the sig gen and find a matching connector to make a
short test lead. Old Style connector to BNC.
My news group service doesn't allow me to see the group
a.b.s.e Pity. So I can not see the picture you posted.

Pity. Hopefully some kind soul will post it onto a web site for you. I
can't as I have no FTP s/ware installed at present. :-(
The output is just under an inch in diameter and is co-axial as you
might expect. The centre pin is about 1/16th" thick and doesn't
protrude beyond the outer. It's pretty unremarkable apart from its
size; much larger than one usually sees.
--

The BBC: licenced at public expense to spread lies.

On Mon, 3 May 2004 02:28:46 -0400, Active8
wrote:

On Sun, 02 May 2004 11:35:08 -0500, John Fields wrote:

On Sun, 02 May 2004 09:04:33 -0500, John Fields
wrote:

snip John helping Paul with terminology

http://www.maxim-ic.com/appnotes.cfm/appnote_number/972

Once in a while, I can post a helpful link (I've got plenty of tech
info links, but most don't usually apply to the topic at hand
whatever that may be) , but some of you guys, like Spehro, You,
etc., ... it's like you can pull horshoe out of yer asses You
must do more digging than I do.

Yup, John Chrighton's another one that springs to mind as being very
good at sniffing stuff out on the Web.

I'd often wondered what these "pads" were for. I'd been a bit
concerned to note that the output amplitude varied quite markedly when
sweeping the generator through it's frequency range when measuring the
'open circuit' voltage with a 'scope. I guess now I know why.
Thanks, guys.
--

The BBC: licenced at public expense to spread lies.

On Mon, 3 May 2004 02:28:46 -0400, Active8
wrote:

On Sun, 02 May 2004 11:35:08 -0500, John Fields wrote:

On Sun, 02 May 2004 09:04:33 -0500, John Fields
wrote:

snip John helping Paul with terminology

http://www.maxim-ic.com/appnotes.cfm/appnote_number/972

Once in a while, I can post a helpful link (I've got plenty of tech
info links, but most don't usually apply to the topic at hand
whatever that may be) , but some of you guys, like Spehro, You,
etc., ... it's like you can pull horshoe out of yer asses You
must do more digging than I do.

Yup, John Chrighton's another one that springs to mind as being very
good at sniffing stuff out on the Web.

I'd often wondered what these "pads" were for. I'd been a bit
concerned to note that the output amplitude varied quite markedly when
sweeping the generator through it's frequency range when measuring the
'open circuit' voltage with a 'scope. I guess now I know why.
Thanks, guys.
--

The BBC: licenced at public expense to spread lies.

On Mon, 03 May 2004 12:56:07 +0100, Paul Burridge
wrote:

On Sun, 02 May 2004 22:37:28 GMT, (John Crighton)
wrote:

Go on, tell us the model number, there are a lot of us
still interested in boat anchor style test equipment.

Is this unit similar to your sig gen
http://www.thevalvepage.com/testeq/avo/sg3/sg3.htm
http://www.thevalvepage.com/testeq/testeq.htm
Unfotunately the connector has been removed and a
BNC type fitted.

Not really similar to any of them, I'm afraid. Model number is CT
378B. I did recognise that old Advance E2, though. Had one of 'em
about 25 years ago. It was pretty ancient then!

I am guessing that you want to keep the original connector
on the sig gen and find a matching connector to make a
short test lead. Old Style connector to BNC.
My news group service doesn't allow me to see the group
a.b.s.e Pity. So I can not see the picture you posted.

Pity. Hopefully some kind soul will post it onto a web site for you. I
can't as I have no FTP s/ware installed at present.

---
Can't you just email it to him?

--
John Fields

On Mon, 03 May 2004 12:56:07 +0100, Paul Burridge
wrote:

On Sun, 02 May 2004 22:37:28 GMT, (John Crighton)
wrote:

Go on, tell us the model number, there are a lot of us
still interested in boat anchor style test equipment.

Is this unit similar to your sig gen
http://www.thevalvepage.com/testeq/avo/sg3/sg3.htm
http://www.thevalvepage.com/testeq/testeq.htm
Unfotunately the connector has been removed and a
BNC type fitted.

Not really similar to any of them, I'm afraid. Model number is CT
378B. I did recognise that old Advance E2, though. Had one of 'em
about 25 years ago. It was pretty ancient then!

I am guessing that you want to keep the original connector
on the sig gen and find a matching connector to make a
short test lead. Old Style connector to BNC.
My news group service doesn't allow me to see the group
a.b.s.e Pity. So I can not see the picture you posted.

Pity. Hopefully some kind soul will post it onto a web site for you. I
can't as I have no FTP s/ware installed at present.

---
Can't you just email it to him?

--
John Fields

"Ralph Mowery" wrote in message
...
My main sig gen states "output EMF using 6dB pad" next to the socket.
WTF is a "6dB pad"?
--

[...snip...]
For the calibration to be accurate on your generator it sounds like the
scale is calibrated so you need the 6 db pad after it. A 5 db pad will
reduce the power by a factor of 4 or a voltage by a factor of 2.

That last 5 should be a 6.

--
Steve N, K,9;d, c. i My email has no u's.

"Ralph Mowery" wrote in message
...
My main sig gen states "output EMF using 6dB pad" next to the socket.
WTF is a "6dB pad"?
--

[...snip...]
For the calibration to be accurate on your generator it sounds like the
scale is calibrated so you need the 6 db pad after it. A 5 db pad will
reduce the power by a factor of 4 or a voltage by a factor of 2.

That last 5 should be a 6.

--
Steve N, K,9;d, c. i My email has no u's.

"Paul Burridge" wrote in message
...
Hi,

I have a spare RF signal generator that has an unmarked output from a
type of socket I've never seen before. What's the simplest way of
establishing its output impedance? I've had a few ideas but no doubt
someone out there will know of something better, since I always seem
to end up making unnecessary work for myself.
Any suggestions?
p.
--
The BBC: licenced at public expense to spread lies.

One more thing to keep in mind, Paul. Over here in the US it is and has for
a long time been standard to display the LOAD level on the generator output
indicator. That is, the voltage (or power) at the load itself (assuming
matched). In the UK - but I don't know about recently, it was common to
show the generator EMF -- which meant the internal generator voltage. This
would be twice what would appear across the load if the load & source Z were
equal.

From your Sig you may very well be familiar with the EMF designation...
--
Steve N, K,9;d, c. i My email has no u's.

"Paul Burridge" wrote in message
...
Hi,

I have a spare RF signal generator that has an unmarked output from a
type of socket I've never seen before. What's the simplest way of
establishing its output impedance? I've had a few ideas but no doubt
someone out there will know of something better, since I always seem
to end up making unnecessary work for myself.
Any suggestions?
p.
--
The BBC: licenced at public expense to spread lies.

One more thing to keep in mind, Paul. Over here in the US it is and has for
a long time been standard to display the LOAD level on the generator output
indicator. That is, the voltage (or power) at the load itself (assuming
matched). In the UK - but I don't know about recently, it was common to
show the generator EMF -- which meant the internal generator voltage. This
would be twice what would appear across the load if the load & source Z were
equal.

From your Sig you may very well be familiar with the EMF designation...
--
Steve N, K,9;d, c. i My email has no u's.

On Mon, 03 May 2004 10:44:14 -0500, John Fields
wrote:

On Mon, 03 May 2004 12:56:07 +0100, Paul Burridge
wrote:

On Sun, 02 May 2004 22:37:28 GMT, (John Crighton)
wrote:

Go on, tell us the model number, there are a lot of us
still interested in boat anchor style test equipment.

Is this unit similar to your sig gen
http://www.thevalvepage.com/testeq/avo/sg3/sg3.htm
http://www.thevalvepage.com/testeq/testeq.htm
Unfotunately the connector has been removed and a
BNC type fitted.

Not really similar to any of them, I'm afraid. Model number is CT
378B. I did recognise that old Advance E2, though. Had one of 'em
about 25 years ago. It was pretty ancient then!

I am guessing that you want to keep the original connector
on the sig gen and find a matching connector to make a
short test lead. Old Style connector to BNC.
My news group service doesn't allow me to see the group
a.b.s.e Pity. So I can not see the picture you posted.

Pity. Hopefully some kind soul will post it onto a web site for you. I
can't as I have no FTP s/ware installed at present.

---
Can't you just email it to him?

Oh yeah. I forgot about that!
Better ask here first though, as it's a binary and might not be
welcome.
I've also taken a shot of the whole gen., John. I can certainly e-mail
the pics to you if you're that interested in boat anchors (although
this one's only 25lbs so hardly qualifies). My Marconi, OTOH, has got
to be 3 times that much at least...

--

The BBC: licenced at public expense to spread lies.