I should have said that the inter-winding capacitive effects are MINIMIZED.
Time to wake up!

Pete

"Pete KE9OA" wrote in message
. ..
Oh, that's what that e-mail was about............................no, Dave
didn't turn that over to me. Which mod were you talking about? Was this
about changing all of the front end switching diodes in the 3030 to PIN
diodes? If they have questions, feel free to send them my way.
Now, about the new Palstar unit I am developing..............I wound a MW
loopstick for this unit. Like the LW loopstick, I have a little bit more
than a 6:1 tuning range. I can tune the MW loopstick from 485kHz to
3100kHz. This is using Litz wire with close wound turns. The research that
I have done indicates that when using Litz wire, the inter-winding
capacitive effects are eliminiated. What this means is that if you wind
two loopstick antennas..........one of them uses Litz wire and the other
one uses solid enamel wire..........when using the same tuning capacitor
to resonate them, you will be able to resonate the Litz wire wound
loopstick to a higher frequency, while still having the same low end
resonance as the enamel wire wound loopstick.
In addition to this, the Litz wire wound loopstick will have a sharper
tuning characteristic and higher RF output, because of the higher Q
afforded by the Litz wire itself. I know................the crystal radio
builders have already known this, since before I was born!

Pete

"Drifter" wrote in message
...
Good business, Pete. i got a spot for one right here.

side note, was wondering if Dave turned ownership of the
Yahoo Lowe group over to you? a few of the UK posters were
asking who was the mod there. if it's you, ya might want to
drop by the group. spam is starting to get in again. and,
a big thanks for the help on the ar3030. your were right,
it was the diode in the filter set up.

thanks again.
Drifter...




Pete KE9OA wrote:
It should be on the market soon..............as many of you have
guessed, Palstar is going to be putting it into production. I was hoping
that I would be able to cover longwave and medium wave with one
loopstick, but it looks like it will take two of them to cover the
range.
I tested the longwave loopstick this morning, and it covers 85kHz to
500kHz in one band. The Loran station on 100kHz was coming in at S9
+20dB. Now that the prototype is completed, I will be doing a board
layout that will use the MW550P enclosure. This way, the same mounting
hole pattern, switch placement, etc, can be used. This thing has so much
gain that it will be necessary to have a switchable attenuator after the
output amp. This performance is with the 1/2 inch ferrite rod
stock...........I can't wait until the 5/8 inch stock comes in!
I was just talking to Paul this morning.............he tells me that
there are many people that would also like this thing to cover the
shortwave bands. It seems that when you get above 5 or 6MHz, the nulls
aren't quite as deep. I will investigate this further. I think if I can
get longwave through 6MHz, that should be good for a start.

Pete

"J @ Hotmail" wrote in message
...
Hurry, hurry, get it on the market. 'Making room on my desk.
"Pete KE9OA" wrote in message
. ..
I just wired up the new unit with the wide range tuning capacitor. It
measures from 14pf to 1600pF. The tuning is a little bit skewed
towards
the
low end, so I am going to wind a MW loopstick and see how low I can
tune
with it. In my original prototype, I used a high Q tuning cap that had
ceramic standoffs for the stator plates. The new cap has a much higher
Q,
as
evidenced by the 10dB increase in RF output. The final version may
need a
Q
spoiling control. A vernier drive will definitely be required for
tuning.
Still a bit of work to do............I think the enclosure for the RF
unit
will be fine, but the enclosure for the loopstick will need to be an
injection molded structure and will consist of a clamshell affair that
can
be screwed together. This will make it more manufacturable. I am using
PVC
pipe for the prototype units. Last night, I wound a loopstick for the
1.6
to
5.4MHz range. It was nice to be able to null out that interference on
60
Meters. Oh well..............time to go to sleep!

Pete

"RHF" wrote in message
...
On Feb 15, 6:48 am, "
wrote:
On Feb 15, 6:43?am, "Pete KE9OA" wrote:

I've got the first iteration prototype completed. Yesterday, I had a
chance
to compare this unit to a McKay Dymek
snip .
- - I can't reveal who the manufacturer of this unit is going to be,
- - but some of you have probably already guessed it.
- -
- -Pete
-
- The word on the Palstar group at Yahoo is that Palstar
- is intending to launch a number of new products this year,
- including an active ferrite/loop antenna with interchangeable
heads,
- a transceiver and a receiver.
- The active antenna is likely to debut at Dayton in May.
-
- 73 John KC0G
-

Well if Pete [KE9OA] is Designing It -and- Palstar is Building It

it will be a gooder - imho ~ RHF
.
CAUTION : This Post Has Not Been "Approved"
-by- Telamon. - http://tinyurl.com/yshplv
-ps- So Read It Only -If- You Are "Clueless".
-back-at-cha- Teli-Baby that is # 216 for the Month.
.







--
"Regulatory capitalism is when companies invest in lawyers, lobbyists,
and politicians, instead of plant, people, and customer service."
- former FCC Chairman William Kennard (A real FCC Chairman,
unlike the current Corporate Spokesperson in the job!)