"Jerry Stuckle" wrote in message
...

Don't bother - he doesn't know the difference, so it's unrelated to his
question (IOW, he can't answer, so he blames everyone else for his
ignorance).


Grow up, OM, that you may disagree with a technical matter is
nojustification
for you to sling abusive remarks, perhaps in an attempt to make yourself
feel better?

A single crystal filter together with its phasing control both fed
differentially
from either side of a transformer secondary cannot be Butterworth,
Tchebychev,
Elliptical, Cohn or any other multi pole filter that you would care to
posit,
simply because there are only two poles

As to not knowing the difference, it does appear that once again you exhibit
Freudian projection.

"Scott Dorsey" wrote in message
...
Ian Jackson wrote:
In message , Scott Dorsey writes:

Mine too, I don't really understand what you're asking. The crystal
filter
is a bandpass filter. The phasing control affects the symmetry of the
filter somewhat (but not really all that much).

The crystal by itself has a natural 'blow-suck' signal throughput, with a
sharp notch just HF of the peak. The phasing control capacitor should be
able to move the notch to the LF side of the peak, and also (to a limited
extent) to move the notch a little closer to the peak (on either side).

Yes, and that notch is useful for eliminating a single interfering CW
signal. But it's not useful for multiple interfering signals or much
at all for SSB.

"Single signal reception" to me would imply a narrow-sloped bandpass
filter but it sounds more like marketing than engineering.

Perhaps you, as indeed do others seem, are trying to interpret a technique
from
the 1930s and 1940s in terms of the multi-pole Xtal filters that are the
norm today?

"gareth" wrote:
"Jerry Stuckle" wrote in message
...

Don't bother - he doesn't know the difference, so it's unrelated to his
question (IOW, he can't answer, so he blames everyone else for his
ignorance).


Grow up, OM, that you may disagree with a technical matter is
nojustification
for you to sling abusive remarks, perhaps in an attempt to make yourself
feel better?

A single crystal filter together with its phasing control both fed
differentially
from either side of a transformer secondary cannot be Butterworth,
Tchebychev,
Elliptical, Cohn or any other multi pole filter that you would care to
posit,
simply because there are only two poles

As to not knowing the difference, it does appear that once again you exhibit
Freudian projection.

That's it Gareth, when in over your head, keep swinging wildly! Ah, that
indefatigable Welsh spirit!

--
If the above message is full of spelling mistakes or the snipping is duff,
it's probably because it was sent from my iPhone, likely whilst walking.
Apologies!

=?ISO-8859-1?Q?philo=A0?= wrote:
Well, even though the guy is a troll, I always try to make to best of
everything. Though I had known about the "homebrew" group I had never
before known of the existence of the "boatanchor" group.

Welcome! It is a good place! Traffic is much lower than it used to be,
but there are still plenty of interesting people hanging out here.

I can now relive the good old days.

Through the years I have gotten rid of most of my "boatanchors"
but happily still have my HQ-140-X

I had one of those when I was a novice and eventually did a horse-trade
for an R-388 that made me a lot happier, but you can't really complain
about any of those old rigs. You turn on the receiver and there are
people talking and after a few decades that's still pretty cool.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

gareth wrote:
"Scott Dorsey" wrote in message

"Single signal reception" to me would imply a narrow-sloped bandpass
filter but it sounds more like marketing than engineering.

Perhaps you, as indeed do others seem, are trying to interpret a technique
from
the 1930s and 1940s in terms of the multi-pole Xtal filters that are the
norm today?

Well, yes. That is the point of this thread, isn't it?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

"Brian Reay" wrote in message
...

Needless to say, he will never share his supposed new found knowledge from
the book he has 'found'.


I will be quite happy to share the information with you, or, indeed any
genuine
enquirer who emails me, OM.

"Scott Dorsey" wrote in message
...
gareth wrote:
"Scott Dorsey" wrote in message

"Single signal reception" to me would imply a narrow-sloped bandpass
filter but it sounds more like marketing than engineering.

Perhaps you, as indeed do others seem, are trying to interpret a technique
from
the 1930s and 1940s in terms of the multi-pole Xtal filters that are the
norm today?

Well, yes. That is the point of this thread, isn't it?

No, it isn't.

I have a junk box going back 50 years from which I intend to make the sort
of RX that I dreamed of as a teenager in the 1960s, on the basis that if I
do
not make use of all those museum bits and pieces, the executor of my will
will be likely to bin the lot.

I am inspired by the ham-bands only Eddystone EA12 and am making slow
progress
in a DIY effort to manufacture the gears for the dial drive and am now
considering
the manufacture of a Catacomb along the lines of the National NC100X.

One technique from those pre-mechanical, and multi-pole or monolithic
Xtal, filters was to use a _SINGLE_ crystal early on in the IF chain, and it
is that
single crystal together with its phasing control that interests me at the
moment.

On Sun, 25 Aug 2013 14:52:27 +0000, Stephen Thomas Cole wrote:


Gareth Alun Evans G4SDW has quite the colourful past history in
uk.radio.amateur. If you fancy a good laugh, have a delve through the
Google Groups archive. It will not surprise you to learn that his
behaviour at one point eventually resulted in a police officer standing
on his head.

IIRC that incident was unrelated to Gareth's behaviour and was in fact a
result of the deranged imagination of your chubby chum.

HTH

Anton Deque wrote:
On Sun, 25 Aug 2013 14:52:27 +0000, Stephen Thomas Cole wrote:


Gareth Alun Evans G4SDW has quite the colourful past history in
uk.radio.amateur. If you fancy a good laugh, have a delve through the
Google Groups archive. It will not surprise you to learn that his
behaviour at one point eventually resulted in a police officer standing
on his head.

IIRC that incident was unrelated to Gareth's behaviour and was in fact a
result of the deranged imagination of your chubby chum.

HTH

Nope, it stemmed directly from his behaviour online.

Here's some clippings from the web:

Radio ham Gareth Evans, G4SDW, was reported to have been arrested in
connection with the harassment of an Internet chat room user.
Now Mr Evans, 54, of Hardens Close, Chippenham SN15 3AA, has made a
complaint to police that he was roughly treated during the arrest.
But police say they are confident they acted within the law when arresting
him.
Mr Evans, who has been bailed pending further police inquiries, was
arrested by six officers at his home on Monday 7th March 2005.
He claims he was pinned to the floor by three police officers, while
another put a boot on the side of his face and forced his head into the
ground.
He said: "They carried me out by the strap of the handcuffs which were
biting against the bone." But Sergeant Matt Armstrong said officers had
made a video recording of the arrest, "We are confident we acted within the
law and if Mr Evans made a complaint then it will be fully investigated by
the Police Professional Standards Department and could be referred to the
Independent Police Complaints Commission.
"He was released on bail pending further inquiries."
Mr Evans was kept in custody overnight at Melksham Police Station and
subsequently made a complaint to Chief Superintendent Amanda Eveley.

///
POLICE sergeant Richard Fullers name has been cleared after he was found
not guilty of using unreasonable force to arrest a man.

Radio ham Gareth Evans, 55, had complained Sgt Fuller, who lives near
Devizes, had unnecessarily used his foot to force his head to the ground
while he was being arrested at his home, in Hardens Close, Chippenham, in
March.
Magistrates in Chippenham found Sgt Fuller, a member of the force's armed
response unit based in Devizes who has an unblemished career record, not
guilty on the second day of his trial on Thursday, February 9.
They said he had not intended to harm Mr Evans, who suffered superficial
facial injuries, and had not used excessive or unreasonable force. He was
alleged to have forced Mr Evans' head to the ground with his foot.

Magistrates in Chippenham heard Mr Evans was arrested at his home in
Hardens Close in connection with the harassment of an Internet chat room
user a case which has since been dropped. The court was shown a video of
the arrest and photographs of Mr Evans' facial injuries taken after the
incident. Mr Evans, 55, spoke of his terror at the arrest, which used what
he described as "agonising force".
Giving evidence, he said: "I was upstairs in my office when I saw a number
of police coming up the road. "I came down to the front door where they
told me they were going to arrest me. "I was in a panic and extremely
frightened by so many people. "I had been at the door for several minutes
when I was suddenly thrown to the floor. It was completely uncalled for.
"A handcuff had been put on to my left wrist with huge force.

Eleven months later and the mark is still visible. I was in a panic that
the same thing was going to happen to my right wrist and I was flailing
around on the floor. "Mr Fuller was swearing at me continuously and I
remember him saying to me I know what to do about this'. A boot was applied
for my face and ground down hard and I gave a cry of distress. "I was lying
on the floor pinned down by a number of officers. There was a feeling of
despair as the handcuff was placed tightly around my other wrist."

Peter Coombe, prosecuting, said the question wasn't whether the incident
happened, but if it amounted to reasonable force. He said: "It was clear
that Sgt Fuller lost his temper and used excessive force. "It was clearly
motivated by anger and that is reflected by the remarks he made at the
time. Mr Evans posed no risk of immediate violence.

"The state entrusts police officers with the right and power to use force
when necessary and must be guarded against using it in excess." Mr Evans
was examined by a forensic pathologist who found the injury on his face
consistent with contact of the boot of the type worn by Sgt Fuller.

Nick Fridd, defending, said by last June Mr Evans had made 59 complaints to
the Independent Police Complaints Commission about Wiltshire Constabulary.
He said Mr Evans aired his views of the police force on the Internet,
calling them the "we'll s***e all over you constabulary". He also said
former police officer Roy Clarke, who was stabbed to death in his Melksham
home in December 2004, "deserved what he got".

When asked by Mr Fridd if he shouted and screamed during the arrest to draw
the attention of his neighbours, Mr Evans replied: "No. I was in absolute
agony. I've never known such pain."

--
If the above message is full of spelling mistakes or the snipping is duff,
it's probably because it was sent from my iPhone, likely whilst walking.
Apologies!

On 08/25/2013 10:08 AM, Scott Dorsey wrote:
=?ISO-8859-1?Q?philo=A0?= wrote:
Well, even though the guy is a troll, I always try to make to best of
everything. Though I had known about the "homebrew" group I had never
before known of the existence of the "boatanchor" group.

Welcome! It is a good place! Traffic is much lower than it used to be,
but there are still plenty of interesting people hanging out here.

I can now relive the good old days.

Through the years I have gotten rid of most of my "boatanchors"
but happily still have my HQ-140-X

I had one of those when I was a novice and eventually did a horse-trade
for an R-388 that made me a lot happier, but you can't really complain
about any of those old rigs. You turn on the receiver and there are
people talking and after a few decades that's still pretty cool.
--scott





I actually purchased the HQ-140-X at a rummage sale near my house about
25 years ago. My original novice receiver was an HQ-110-C which I later
used to trade-up to a Drake 2A which I probably never should have sold.