NiZn Ferrite Toroid R40C1- 37x23x7mm for High Q SW balun & Crystal Radio Coils

Description

We are a great source for many of your litz wire and crystal radio part needs. Since 2008, we've sold more than 10,000 orders with excellent customer feedback. Please visit our eBay Store at
mkmak222_Litz Wire
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Here you are bidding on a
special
nickel-zinc
ferrite toroid. The size is 37 X 23 X 7 mm, use Ni-Zn R40C1 material. Made in China.
The
Products made by
Ni-Zn R40C1 material are design to use for
shortwave
transmitter power
distribution,
power combining
,
impedance transformation
,
power output
,
power
chokes,
short wave
antenna
barron
and so on; in high frequency applications they have low loss characteristics.
The photo above shows the characteristics of this R40C1 ferrite toroid. Its applied frequency is up to 50 MHz.
The R40C1
Ferrite Toroid
s made by special formula.
We don’t know why this type of Ferrite Toroid has very high Q when wind the coils for LW, MW and part of the SW. Even though the material R40C is very close to R40C1, the Q is much lower with the same coil spec (usually not easy to reach 700Q in MW). I introduce the R40C1 here because the Crystal Radio enthusiast always wants to make coils that have high Q and want them as high as possible. The coils I wound with R40C1, are able to get 900 Q at 3 MHz.
For sure the R40C1 can use for many other applications. This field is waiting for discover by amateurs.
Use this R40C1 37 X 23 X 7 mm ferrite toroid and litz wire to make coils will give you a big surprise! It can get very high Q value and let the radio circuits
significantly
increase the selectivity
and sensitivity.
I stick
two
37 X 23 X 7 mm toroids together
with a layer of
Teflon
membrane
(PTFE). It is equivalent to
37 X 23 X 14 mm
and intertwines
60
turns
of
250/AWG 46
Litz wire
(the wire length is 16 feet)
.
Inductance
of this coil is about
223
µh
.
The results measured from a HP 4342A Q meter are
:
530 KHz
1305 Q
555 KHz
1317 Q
605 KHz
1328 Q
705 KHz
1335 Q
805 KHz
1321 Q
905 KHz
1293 Q
1005 KHz
1247 Q
1105 KHz
1203 Q
1205 KHz
1146 Q
1305 KHz
1098 Q
1405 KHz
1051 Q
1505 KHz
1004 Q
1605 KHz
950 Q
In 1605 KHz still has 950 Q.
Then
I thought of Ben Tongue's Contra Wound Coil. I intertwine
two coils
opposite direction
; each one is
29
turns
250/AWG 46
Litz wire
(the wire length is 16 feet)
.
Inductance
is 205
µh
when two coils is series connection (29 + 29 turns), and 63
µh
when two coils is in parallel (29 turns but equivalent
with the 500/AWG 46
Litz wire). Measurement
results are
:
Series connection
Parallel connection
545 KHz    1257 Q
____
555 KHz    1265 Q
____
605 KHz    1290 Q
____
705 KHz    1322 Q
____
805 KHz    1331 Q
____
905 KHz    1324 Q
____
1005 KHz  1299 Q
1085 KHz   1424 Q
1105 KHz  1274 Q
1105 KHz   1426 Q
1205 KHz  1241 Q
1205 KHz   1425 Q
1305 KHz  1205 Q
1305 KHz   1416 Q
1405 KHz  1168 Q
1405 KHz   1405 Q
1505 KHz  1129 Q
1505 KHz   1389 Q
1605 KHz  1090 Q
1605 KHz   1371 Q
____
1705 KHz   1351 Q
____
1805 KHz   1331 Q
____
1905 KHz   1308 Q
____
2005 KHz   1283 Q
____
2105 KHz   1262 Q
____
2205 KHz   1236 Q
____
2305 KHz   1211 Q
____
2405 KHz   1184 Q
____
2505 KHz   1162 Q
Up to 2.5 MHz still can get 1162 Q.
An amateur used two
R40C1 37 X 23 X 7 mm ferrite toroids and 165/46 litz wire to wound a coil, the Q are all over 1212Q between 500 – 1700 KHz, the highest point is 1471Q at 900 KHz.
For more information of this R40C1 37 X 23 X 7 mm ferrite toroid, please search "
The RadioBoard Forums
" on google and read all interesting articles of “
R40C1
” in
Crystal Radios section.
If you need 175/46, 250/46, 270/46, 300/48, 420/48 or 675/48 litz wire to make coils for this ferrite toroid, please visit my eBay store
mkmak222_Litz Wire
to search these litz wire.
Please e-mail any questions you may have before you order.
Please make
payment arrangements within 3 days. I accept PayPal only.
Payment is expected within 10 days when place an order, or item will be released for sale.