In message <119qp7k$o9f4$1@solani.org>, Gerhard Hoffmann
<dk4xp@arcor.de> writes

I once used the BE junction of a BFR93A transistor as a noise head
and had it measured at the Weinheim amateur radio meeting. It
delivered 22 dB excess noise to > 2 GHz flat.
Now, I have such a thing + 8970B:
<
https://www.keysight.com/us/en/product/346A/noise-source-10-mhz-18-ghz-n >ominal-enr-6-db.html

cheers, Gerhard

I did that at work in the 1970s. I only wanted 100KHz to about 15MHz. I
used the BE of a BFY90 followed by a 733 and a two- pole two transistor
Sallen Key. My supervisor got a bit sniffy about it. He said the noise
wasn't Gaussian. It was good enough for what I wanted I've still got
the little box I made.

I've used these in ham radio - noise bridges and one with a switch to
check preamps.

Brian

--
Brian Howie

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 9/27/2026 4:25 PM, Jan Panteltje wrote:

Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid>wrote:

Today, I do almost similar things with CorelDRAW! Much to the chagrin
of some of the regulars in comp.lang.c and elsewhere who think open
source is some magic sauce.

Alas, I do not have anything I'd consider /worthy of publication/, as I
have only recently started to draw vectors somewhat seriously.

What do you use when you feel like drawing vectors? Xfig?

Take a picture of your vectorscope:
https://en.wikipedia.org/wiki/Vectorscope
In analog TV times in the studios vectorscopes everywhere
for the color signals (4.43 MHz color carrier phase represents the colo.
r.

https://panteltje.nl/pub/vectorscope.gif

Or from
https://vectormagic.com/

https://panteltje.nl/pub/vectored_cat.gif

CorelDRAW! has a built in tool for exactly this. I can do this locally.

I just don't want to. You see, tracing photographs, or something else,
by hand trains the artist to draw. Pressing a button in CorelDRAW! is
not drawing. It's pressing a button.

And pressing a button on someone else's website is also just pressing a
button.

Ideally, I'd like to use CorelDRAW! to colour my own art in the coming
future, but life has made that exercise difficult, so I make do with
what I can in the mean time.


And if you don't have the budget for a graphical suite, there's always Inkscape, but you must learn it every /n/ updates from scratch, it
seems.

See


https://www.reddit.com/r/Inkscape/comments/vhwemt/im_having_to_go_back_to_older_versions_of/

for a sad anecdata, n=1, of a vexed artist.
--
Johann | email: invalid -> com | http://www.myrkraverk.com/blog/
I'm not from the Internet, I just work there. | via Easynews.com https://bsky.app/profile/myrkraverk.bsky.social | for ( ;; ) _:;
Federated at https://fed.brid.gy/bsky/myrkraverk.bsky.social

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On Tue, 6 Oct 2026 05:39:07 +0100, brian <nospam@b-howie.co.uk> wrote:

In message <119qp7k$o9f4$1@solani.org>, Gerhard Hoffmann
<dk4xp@arcor.de> writes

I once used the BE junction of a BFR93A transistor as a noise head
and had it measured at the Weinheim amateur radio meeting. It
delivered 22 dB excess noise to > 2 GHz flat.
Now, I have such a thing + 8970B:
<
https://www.keysight.com/us/en/product/346A/noise-source-10-mhz-18-ghz-n >>ominal-enr-6-db.html

cheers, Gerhard

I did that at work in the 1970s. I only wanted 100KHz to about 15MHz. I >used the BE of a BFY90 followed by a 733 and a two- pole two transistor >Sallen Key. My supervisor got a bit sniffy about it. He said the noise >wasn't Gaussian. It was good enough for what I wanted I've still got
the little box I made.

I've used these in ham radio - noise bridges and one with a switch to
check preamps.

Brian

https://maurymw.com/products/noise-generators/diodes/nc100-200-300-400-series/


--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)