The K40FILT Board is a companion board to the K40 CW Keyboard Keyer which will allow you to operate RTTY with the K40. The K40FILT accepts audio from your receiver and decodes RTTY into digital serial data that is fed into the K40 for display. In addition K40FILT also supports RTTY transmit by generating sine wave tone pairs that can be fed into a transceiver's mic input. Power for the interface is tapped off the K40 PCB and there are three other connections between the boards. Using PIC based DSP, the K40FILT provides impressive copy for such a small device.
Kit includes the PCB, all I.C.s and all board mounted components as shown.
Note that the K40 enclosure can only accomodate one interface module. There is only room for one and the K40 PCB is not capable of interfacing to more than one module. Different K40 firmware is required for each. The RTTY module runs with K40 rev F firmware while the CW Reader runs with K40 rev G firmware.
The chipset in the K40 must be upgraded to Revision F to support the K40 RTTY Filter. You can do this one of two ways, first way is to send in the two PIC chips from your K40 back to K1EL with $2 to cover postage for a free upgrade. Second way is to order an upgrade chipset for $6.
When the K40 powers up it displays the firmware revision of the two PICs, they must both be vF to support the K40 RTTY Filter:
K40 Rev F Upgrade - $6 USD
(2 PIC I.C.s)
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