Manufacturing ATU switches
 

Picking up a project that has been put down for 6 months - has
anybody got experience of manufacturing their own ATU
switches out of brass, either as knife switches or else as
ginormous banana plugs which then engage axially with
a sliding action?

I have conceived of a design for an experimental ATU that
allows changes of configuration (including the safety earthing
when not in use) using only 8 single-pole single throw switches,
into the most common configurations.

(I may have mentioned this before in this NG, sorry if so and
thus inducing ennui in my loyal-but-paranoid fan-club of CB types
who seem to hang on my every word)

"Airy R.Bean" wrote in message
...
Picking up a project that has been put down for 6 months - has
anybody got experience of manufacturing their own ATU
switches out of brass, either as knife switches or else as
ginormous banana plugs which then engage axially with
a sliding action?

I have conceived of a design for an experimental ATU that
allows changes of configuration (including the safety earthing
when not in use) using only 8 single-pole single throw switches,
into the most common configurations.

(I may have mentioned this before in this NG, sorry if so and
thus inducing ennui in my loyal-but-paranoid fan-club of CB types
who seem to hang on my every word)


I cant believe the amount of **** you come out with!

On Tue, 11 Jan 2005 12:52:27 -0000, "Airy R.Bean"
wrote:

I may have mentioned this before in this NG

Which ng? You have posted to two.
--
from
Aero Spike

On Tue, 11 Jan 2005 13:10:39 -0000, "Dominic G7NPW"
wrote:

I cant believe the amount of **** you come out with!

You might not like what Bean posts, and few would disagree with you,
but PLEASE DONT REPOST IT ALL JUST TO ADD A ONE-LINER.
--
from
Aero Spike

"Spike" wrote in message
...

SNIP

You might not like what Bean posts, and few would disagree with you,
but PLEASE DONT REPOST IT ALL JUST TO ADD A ONE-LINER.

Advice Taken, Thanks for pointing this out to me.

73 Dominic

"Spike" wrote in message
...

SNIP

You might not like what Bean posts, and few would disagree with you,
but PLEASE DONT REPOST IT ALL JUST TO ADD A ONE-LINER.

Oh and there was no need to shout at me I can hear you fine.

73 Dominic

On Tue, 11 Jan 2005 13:46:05 -0000, "Dominic G7NPW"
wrote:


"Spike" wrote in message
.. .

SNIP

You might not like what Bean posts, and few would disagree with you,
but PLEASE DONT REPOST IT ALL JUST TO ADD A ONE-LINER.

Advice Taken, Thanks for pointing this out to me.

You're welcome.

It's just that those who have killfiled Bean because they don't want
to see his posts may well killfile you for that same reason, shoud you
continue to repost the whole of his postings. Usually it's only
necessary to quote a word or two from him in your reply, as he hasn't
said anything new seemingly for ages......
--
from
Aero Spike

"Starr" wrote in message
...

you certainly enjoyed constructing your web site didn't you? :)

Yep, Better then Corro & Eastenders.


--
Regards Dominic G7NPW

Derby Echolink Gateway. Number 92369

www.derby-radio.co.uk

"Airy R.Bean" wrote -
Picking up a project that has been put down for 6 months - has
anybody got experience of manufacturing their own ATU
switches out of brass, either as knife switches or else as
ginormous banana plugs which then engage axially with
a sliding action?

I have conceived of a design for an experimental ATU that
allows changes of configuration (including the safety earthing
when not in use) using only 8 single-pole single throw switches,
into the most common configurations.

==================================

The trouble with as many as 8 single-throw, high-current, high-voltage
switches in a tuner, is the stray inter-component wiring and inductance and
capacitance they introduce.

Even with a minimum number of, or no switches, it requires TWO independent
tuners, in separate boxes with separate coaxial connectors, to cover the
range 1.8 to 30 Mhz with reasonable power efficiency.

You need practical experience by building one or two to see how they
perform. Try again and then come back!
----
Reg.

"Reg Edwards" wrote in message
...


The trouble with as many as 8 single-throw, high-current, high-voltage
switches in a tuner, is the stray inter-component wiring and inductance
and
capacitance they introduce.

Even with a minimum number of, or no switches, it requires TWO independent
tuners, in separate boxes with separate coaxial connectors, to cover the
range 1.8 to 30 Mhz with reasonable power efficiency.

You need practical experience by building one or two to see how they
perform. Try again and then come back!


Would a solution based on two, contra-rotatinng "roller coasters" not be
better? This would enable a true balanced ATU to be made, offering a wide
matching impedance, and, with motorised capacitor, avoiding switching all
together?

Making a suitable capacitor is straight forward. The rollor coaster former
will turn up on a lathe nicely (I've made a similar former from PTFE in the
past). The rest of the mechanics are easy enough.

--
Brian Reay
www.g8osn.org.uk
www.amateurradiotraining.org.uk
FP#898

I have conceived of a design for an experimental ATU

==============================

Stick to conceiving babies - try Viagra - you might have greater success.

(I may have mentioned this before in this NG, sorry if so and
thus inducing ennui in my loyal-but-paranoid fan-club of CB types
who seem to hang on my every word)


dont feed the troll

Which is why I was considering the use of axially operated
banana-plug-like switches which would then exist in-line with the
wiring, and be operated by fishing line (in a sort of pull-in/pull-out
mode).

Knife switches of sufficient mechanical movement would also serve
to reduce capacitive coupling when open. Now that I mention it, I
do seem to remember discussing this before, especially with regard to
springy brass for knife switch contacts.

"Reg Edwards" wrote in message
...

"Airy R.Bean" wrote -
Picking up a project that has been put down for 6 months - has
anybody got experience of manufacturing their own ATU
switches out of brass, either as knife switches or else as
ginormous banana plugs which then engage axially with
a sliding action?

The trouble with as many as 8 single-throw, high-current, high-voltage
switches in a tuner, is the stray inter-component wiring and inductance
and
capacitance they introduce.

A woman goes into the chemist, "Does that Viagra really work?"
"Oh Yes! Madam! I can vouch for its effectiveness personally!"
"Can you get it over the counter?"
"I can if I take two!"

-----ooooo-----

A man reaches over the counter and steals some Viagra.
However, on rushing out of the chemist's, he bumps into a plod.
In a panic, he swallowed the whole contents of the packet and
ran off.
The plods are looking for someone with a very stiff neck.

-----ooooo-----

Because of concerns about corruption in the NHS, doctors are
no longer allowed to prescribe Viagra, as such, they have to
specify it by its chemical name.....
......
......
......
MYCOXAFLOPPIN


"Reg Edwards" wrote in message
...
I have conceived of a design for an experimental ATU
Stick to conceiving babies - try Viagra - you might have greater
success.

I made a hf atu. Tends to arc across tho above 100w. Pity Bean hasnt got his
finger in it at the time.


"Airy R.Bean" wrote in message
...
Picking up a project that has been put down for 6 months - has
anybody got experience of manufacturing their own ATU
switches out of brass, either as knife switches or else as
ginormous banana plugs which then engage axially with
a sliding action?

I have conceived of a design for an experimental ATU that
allows changes of configuration (including the safety earthing
when not in use) using only 8 single-pole single throw switches,
into the most common configurations.

(I may have mentioned this before in this NG, sorry if so and
thus inducing ennui in my loyal-but-paranoid fan-club of CB types
who seem to hang on my every word)

On Tue, 11 Jan 2005 18:56:58 GMT, "Neil"
wrote:

I made a hf atu. Tends to arc across tho above 100w. Pity Bean hasnt got his
finger in it at the time.


I made a Z-match, it tended to arc on 40m, but not on other bands. It
depends much on the antenna impedance


---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm

On Tue, 11 Jan 2005 17:32:28 +0000 (UTC), "Reg Edwards"
wrote:



The trouble with as many as 8 single-throw, high-current, high-voltage
switches in a tuner, is the stray inter-component wiring and inductance and
capacitance they introduce.

Even with a minimum number of, or no switches, it requires TWO independent
tuners, in separate boxes with separate coaxial connectors, to cover the
range 1.8 to 30 Mhz with reasonable power efficiency.

You need practical experience by building one or two to see how they
perform. Try again and then come back!
----
Reg.

not posted to uk.radio.amateur cb-group

Don't understand why one should make switches, they are offered in
large quantities at rallies and many other occasions


LA8AK
---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm

You don't understand the interest and enthusiasm
that comes from doing things yourself?

Are you really a Radio Ham?

"J M Noeding" wrote in message
...
On Tue, 11 Jan 2005 17:32:28 +0000 (UTC), "Reg Edwards"
wrote:
The trouble with as many as 8 single-throw, high-current, high-voltage
switches in a tuner, is the stray inter-component wiring and inductance
and
capacitance they introduce.
Even with a minimum number of, or no switches, it requires TWO
independent
tuners, in separate boxes with separate coaxial connectors, to cover the
range 1.8 to 30 Mhz with reasonable power efficiency.
You need practical experience by building one or two to see how they
perform. Try again and then come back!
not posted to uk.radio.amateur cb-group
Don't understand why one should make switches, they are offered in
large quantities at rallies and many other occasions

On Wed, 12 Jan 2005 14:54:05 -0000, "Airy R.Bean"
wrote:

You don't understand the interest and enthusiasm
that comes from doing things yourself?

again xposted to the CB newsgroup I deleted in the first place.


Are you really a Radio Ham?


Radio amateurs have official callsigns, did you know? Non of your
postings indicates that you have such callsign to show us

---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm

As the originator of this thread, I retain the two groups to
which it was posted.

"J M Noeding" wrote in message
...
On Wed, 12 Jan 2005 14:54:05 -0000, "Airy R.Bean"
wrote:
You don't understand the interest and enthusiasm
that comes from doing things yourself?
again xposted to the CB newsgroup I deleted in the first place.

Or...I do when I remember to add it!

"Airy R.Bean" wrote in message
...
As the originator of this thread, I retain the two groups to
which it was posted.

"J M Noeding" wrote in message
...
On Wed, 12 Jan 2005 14:54:05 -0000, "Airy R.Bean"
wrote:
You don't understand the interest and enthusiasm
that comes from doing things yourself?
again xposted to the CB newsgroup I deleted in the first place.

"Airy R.Bean" wrote:


Are you really a Radio Ham?


Radio amateurs have official callsigns, didn't you know? Non of your
postings indicates that you belong to such group

LA8AK

---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm

Your Childish Broadcast (CB) quoted below seems
to classify you in another group.

I advise everybody who appears on Usenet to remain
anonymous because there are a large number of
vicious loonies around.

"J M Noeding" wrote in message
...
"Airy R.Bean" wrote:
Are you really a Radio Ham?
Radio amateurs have official callsigns, didn't you know? Non of your
postings indicates that you belong to such group

Callsigns are not required on Usenet, in any case.

"Airy R.Bean" wrote in message
...
Your Childish Broadcast (CB) quoted below seems
to classify you in another group.

I advise everybody who appears on Usenet to remain
anonymous because there are a large number of
vicious loonies around.

"J M Noeding" wrote in message
...
"Airy R.Bean" wrote:
Are you really a Radio Ham?
Radio amateurs have official callsigns, didn't you know? Non of your
postings indicates that you belong to such group