OK, I am finally ready to announce the Dual Band modification to the KN-Q7A or CS-series radio using the Sandwich VFO. The modification is easy.
I can provide the Sandwich code modification based on three things:
1) Base frequency of original radio (basically the crystal filter chain frequency)
2) Base Band operation for example a CS-40 or 40 Meter band operation.
3) Additional band you wish to add such as 80 Meters to the 40 Meter base radio.
The cost of the kit includes a PCB for both the Receive and Transmit Frequencies, all parts including the appropriate DIY7 coils. The introductory price will be $35 USD plus shipping.
Software will be downloadable from my website once I complete the various permutations of the code. The software and schematic will be available whether you purchase my kit or not. However, I support what I sell.
I made a slight error to the first PCB, so you will need to follow the instructions regarding the coils. I will fix the problem on the next revision of the PCB. The error does not affect the signal or the filter.
The first run will have limited quantities available. I have for example 4 kits ready for shipment 80/40 for Base 40 Meter. I will kit others as the orders come in.
I am finishing the touches of the manual which should be available by the end of the day.
I will add additional photos later.