The modification to the RX-1 is finished and I am very pleased with the way it works. All I have remaining is to install the cw filter which will fit into the remaining space behind the controls. The receiver will tune all of the ham bands.
Here is what I did. Installed a 5 volt regulator.
Installed a K5BCQ si570 controller 2 kit. This kit has user programmable band pass filter selection output.
Added a low pass filter to the output of the SI570 which you can see in the middle of the controller.
The controller will only operate down to 3500 kHz with out using a frequency divider chip. If 160 meters is needed, then a divider chip must be installed.
The SI570 controller 2 will switch the band pass filters of the WB6DHW band pass filter kit which is also available from K5BCQ.
The band pass filter kit is mounted above the RX-1 Receiver board.
The RX-1 band pass filter was removed and the WB6DHW band pass filter kit was installed into its place.
The little green leds are cut off and glued to push buttons. only one is functional for the mem button of the VFO
The SI570 controller kit consists of only the pc board and programed micro chip. You will have to order the other components.
I will have to install small shielded cable for the BPF I/O and also RF output from the SI570 VFO. Wire position of those wires results in hum if not shielded.
This was a fun project, Now, I have to find some thing else to do.
Robert KH2BR