Work is in progress. The recent weeks I finished all the 6 modules that are going to be the receiver:
- Band pass filter section
- Relay switches for switching the BPFs
- RF preamp, RX mixer and IF preamp
- IF main amp
- Product detector and AF amp section
- AGC unit
Mounted together to an aluminium carrier board it looks like this:
On the picture the board is not equipped with the neccessary wiring yet to give the reader more sight on the single circuits. Next I will draw a schematic of each board to point out the used circuitry for those who want to build this or a similar receiver.
First test are promising so far, the receiver is sensitive, has a very low noise figure (due to dual gate MOSFETs in the preamp and the two main IF amp stages) and has shown no problems to cope with high out-of-band broadcaster signals on the 40 meter band which is due to the SBL-3 mixer I have used that has a good IM3 performance..
Thanks for watching an 73 de Peter (DK7IH)