Lots of tribal knowledge here! That's the direct conversion receiver that forms phase 1 of Pete and Ben's "Let's Build Something" project. Arduinos! Si5351s! AD9850s! And it will morph into an SSB transceiver. Check it out:
http://www.jessystems.com/LBS_Detail.html
Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20
Great resource! I find my own superhet project (based on kitsandparts modules) is having a similar problem. I'm getting a 9.035 MHz shortwave station bleeding into the IF amp. (I'm using a 9 MHz IF, since I was able to get some crystal filters). I know it's a mixer problem, but they are pretty simple, and I can't see where I went wrong. Short in the diodes, maybe?
ReplyDeleteAnyway, thanks again for the reference material!
73,
Steve
W1KF
Steve: Sometimes a strong station will just jump right into the IF. I had a superhet with a 3.579 IF. I could hear evangelical stations AND W1AW CW. Sometimes things get better when you put the receiver in a metal box and tighten up the shielding.
Delete73 Bill
Bill, I thought that as well, but when poking at the mixer board, there was a change. Unfortunately, it's not repeatable, so I cannot find a specific device to repair/replace. I replaced the surface mount quad diode array, and it seemed better for a time, but then went wonky again. I hate intermittent problems...
DeleteAlso, I hope it is not just a shielding issue; 100KW right on my IF is going to be a tough nut to crack.