Customer reviews of AF4K Products.
(Quantities reflect iventory of 28 FEB 2012.
Quantity 4 at 498.6 kHz
Quantity 4 at 497.2 kHz
Quantity 2 at 500.0 kHz
Quantity 4 at 500.2 kHz
Quantity 4 at 501.3 kHz
ALSO:
Quantity 1 - Channel 344 = 478 kHz
Quantity 1 - Channel 930
Quantity 1 - Channel 811
Quantity 1 - Channel 968
E-mail - Order to Brian Carling, AF4K
ADD:
QTY 1: CH 312
QTY 5: CH 926
We have a LARGE qantity of these LF crystals available,
ranging from 150 kHz to 1500 kHz.
Purchase buttons are coming soon!
Several crystals now available - see order secion below with pricing.
During WWII these quartz crystals were manufactured for use in military vehicle radios.
There are two series of these FT-241 crystals, those marked with "two digit" channel numbers,
and those with "three digit" channel numbers. These crystals are marked for frequencies
in the 20 - 40 mhz range, but the fundamental frequencies are much lower.
Some of the crystals fall in the 400 - 500 khz range, and were used by homebrew radio builders in
the 1950's to make crystal filters, especially for SSB receivers and transmitters (see 1950s ARRL handbooks etc.)
Crystal FT-241 / CR-4/U
Dimensions (WHD) 29 x 39 x 12 mm / 1.1 x 1.5 x 0.5 inch
Notes FT-241 crystals, black body, were used in the BC-604 with a working frequency 20-27.9 MHz,
80 "channels" numbered 0-79.
Their fundamental frequency is 370.370 - 516.666 kHz, to be multiplied by 54. The 1/2 inch Pin spacing and diameter is identical to FT243 types.
FT-241 crystals, brown body, were used in the BC-684 with a working frequency 27-38.9 MHz,
120 "channels" numbered 270-389.
Their fundamental frequency is 375.000 - 540.277 kHz, to be multiplied by 72.
These crystals have a very interesting fundamental frequency range to compose sharp
I.F. filters around 450-475 kHz.
Example: Channel 68 = 496.3 kHz.
|
200 kHz |
376 kHz (CH3) |
381 kHz(CH6) |
||||
|
400.1 kHz |
||||||
|
417 kHz (CH25) SOLD? |
430 kHz (CH32) QTY 1 - ADD |
441 kHz (CH38) |
443 kHz (CH39) |
|||
|
444.4 kHz (CH24) |
450 kHz (CH43) |
450.1 kHz |
||||
| 455 kHz QTY 1 - ADD |
456.5 kHz QTY 1 - ADD |
475 kHz |
478 kHz (CH344) |
494 kHz (CH67) |
500 kHz (CH270) |
502 kHz (CH71) |
|
507 kHz (CH74) |
512.5 kHz (CH369) |
513 kHz (CH77) |
533 kHz (384) |
540 kHz |
||
|
1233 kHz (CH888) |
1258 kHz (906) |
ADD 1 CH930 = 1292 kHz | ADD 1 CH 968 = 1344 kHz |
CLICK "VIEW CART" YELLOW BUTTON IN ORDER TO CHECK OUT AND PAY with VISA, MASTERCARD, PAYPAL, American Express etc. !!
The FT241 Frequency Calculator may be found online here:
CLICK HERE for CALCULATOR - thanks, Fritz!
These can be used for experimenting and for use as a crystal lattice filter since several
are on the same frequecies. (These have the same pins as the popular FT243 crystals and use
the same socket but the body is slightly wider.)
QTY 2 - Channel 11 = 391 kHz QTY 1 - Channel 36 = 437 kHz QTY 1 - Channel 344 = 478 kHz QTY 1 - Channel 811 = 1126 kHz QTY 1 - Channel 930 = 1292 kHz QTY 1 - Channel 968 = 1344 kHz
E-mail me to inquire or purchase these. Click here.
I will post more here soon.
QTY 100 (APPROX.) FT243 CRYSTAL BLANKS
I have available about 100 nice clean quartz crystals made for
use in FT243 holders. Supplied with the metal electrode plates.
These are a nice mix from about 1000 kHz up to 8500 kHz.
See photo below:
I will sell the whole bunch for $15.00 plus $5.00 for USA Shipping.
Contact plates are also available; Quantity 100 for $5.00 plus shipping Inquire by e-mail. Click here.
FT243 springs are also available; Quantity 100 for $5.00 plus shipping Inquire by e-mail. Click here.
Phenolic insulators are also available; Quantity 100 for $5.00 plus shipping Inquire by e-mail. Click here.
Copper, tin and brass electrodes (mixed) are also available; Quantity 100 for $5.00 plus shipping Inquire by e-mail. Click here.
DC34 (BC669) CRYSTALS - CLICK HERE FOR LIST.
FT243 CRYSTALS - CLICK HERE FOR LIST.
8 MHz FT243 CRYSTALS - CLICK HERE FOR LIST.
AM Broadcast Band FT243 CRYSTALS - CLICK HERE FOR LIST.
HC49U CRYSTALS - CLICK HERE FOR LIST.
HC-6/U CRYSTALS - CLICK HERE FOR LIST.
Add shipping costs to all prices!
73 from Brian ((( Amateur Radio G3XLQ / AF4K )))
Latest list always updated at:
Main Page
See main page for special terms of sales to Canada.
SEARCH THIS SITE