On Apr 21, 11:14*pm, Bill M wrote:


. *Phones don't respond to watts.


-Bill

Hey OM:

Thanks for the sardonic epiphany.

73 OM

de n8zu

"raypsi" wrote in message
...
On Apr 21, 11:14 pm, Bill M wrote:


. Phones don't respond to watts.


-Bill

Hey OM:

Thanks for the sardonic epiphany.

73 OM

For an education:

http://www.bentongue.com/xtalset/xtalset.html


de n8zu

On Apr 22, 9:18*pm, "Unca Pete" wrote:


For an education:

http://www.bentongue.com/xtalset/xtalset.html

Hey OM:

That's a nice link. But nowhere could I find a diode double, tripler,
or quadrupler detector.

73 OM

de n8zu

"raypsi" wrote in message
...
On Apr 22, 9:18 pm, "Unca Pete" wrote:


For an education:

http://www.bentongue.com/xtalset/xtalset.html

Hey OM:

That's a nice link. But nowhere could I find a diode double, tripler,
or quadrupler detector.

73 OM

Probably because they don't deliver any benefits?




de n8zu

Unca Pete wrote:
"raypsi" wrote in message
...
On Apr 22, 9:18 pm, "Unca Pete" wrote:

For an education:

http://www.bentongue.com/xtalset/xtalset.html

Hey OM:

That's a nice link. But nowhere could I find a diode double, tripler,
or quadrupler detector.

73 OM

Probably because they don't deliver any benefits?

Basically true but in fairness to the folks who have never tried it you
MAY get some additional volume on a reasonably strong local station.
You shoot your selectivity and ultimate sensitivity in the foot, though,
because of the extra loading on the tank. ie, not a DX set.

There's one circuit floating around that uses a dual center-tapped tank
(so to speak) with a diode on each side and their outputs are combined.
One fellow said it worked pretty well as a workaround for the
loading concern. Still not a DXers set but better than attempting a
voltage doubling detector.

-Bill

"Bill M" wrote in message Basically true but in
fairness to the folks who have never tried it you
MAY get some additional volume on a reasonably strong local station. You
shoot your selectivity and ultimate sensitivity in the foot, though,
because of the extra loading on the tank. ie, not a DX set.

There's one circuit floating around that uses a dual center-tapped tank
(so to speak) with a diode on each side and their outputs are combined.
One fellow said it worked pretty well as a workaround for the loading
concern. Still not a DXers set but better than attempting a voltage
doubling detector.

-Bill

Basically a fullwave rectifier?

I'd still opt for a quality matching transformer, and go for the max.
volume if that is the goal.

Pete

Unca Pete wrote:
"Bill M" wrote in message Basically true but in
fairness to the folks who have never tried it you
MAY get some additional volume on a reasonably strong local station. You
shoot your selectivity and ultimate sensitivity in the foot, though,
because of the extra loading on the tank. ie, not a DX set.

There's one circuit floating around that uses a dual center-tapped tank
(so to speak) with a diode on each side and their outputs are combined.
One fellow said it worked pretty well as a workaround for the loading
concern. Still not a DXers set but better than attempting a voltage
doubling detector.

-Bill

Basically a fullwave rectifier?

I'd still opt for a quality matching transformer, and go for the max.
volume if that is the goal.

Pete


Yabbut...max volume isn't the same as max sensitivity in DX sets. Its
only one part of the scheme. I used the term "house of mirrors" in all
seriousness. You upgrade the xfmr to a certain point then you need a
diode that performs to that level and then you need to upgrade the tank
to that level...and so it goes. Thats why high performance crystal
radios are so fascinating. And they really are. I've logged Brasilians
at 3500 miles away.

The guys who are top-scoring in the annual 'test' are logging 100-200
stations. You get there with selectivity and sensitivity...and patience
with good ears. No doubling, tripling, quadrupling circuits are in the
mix. They don't pan out. Its all well documented.

-Bill

On Apr 23, 5:21*pm, Bill M wrote:
Unca Pete wrote:
"raypsi" wrote in message
....
On Apr 22, 9:18 pm, "Unca Pete" wrote:

For an education:

http://www.bentongue.com/xtalset/xtalset.html

Hey OM:

That's a nice link. But nowhere could I find a diode double, tripler,
or quadrupler detector.

73 OM

Probably because they don't deliver any benefits?

Basically true but in fairness to the folks who have never tried it you
MAY get some additional volume on a reasonably strong local station.
You shoot your selectivity and ultimate sensitivity in the foot, though,
because of the extra loading on the tank. ie, not a DX set.

There's one circuit floating around that uses a dual center-tapped tank
(so to speak) *with a diode on each side and their outputs are combined..
* * One fellow said it worked pretty well as a workaround for the
loading concern. * Still not a DXers set but better than attempting a
voltage doubling detector.

-Bill

Bill.
I built one of those several years ago. Plans came from a CQ magazine
article some years before. I couldn't get it to work very well back
then. couldn't get both circuits to tune to the same frequency, even
though it was built symetrically. A week ago, I brought it into the
shack from the shop and tried it again, using my 160 meter lazy quad
antenna. Still couldn't figure any way to get both sides to tune and
track together.

Looks nice and someone may have gotten it to work, but for now, it's
going back to the top shelf in the shop.

Paul, KD7HB