Uploaded August 2021 | Updated September 2026, 2 weeks ago
The BC 348 receiver is well known among radio Amateurs the first
receiver I ever owned was a BC348 and I made my first ever QSO's
using the BC348 I sold the first one and regretted it so this is the second BC348 in my shack which I bought at a Hamfest in 1972 . The bandwidth on receive of the original is as they say broad as a barn this was ok for what it was designed in World War 2 but on the crowded ham bands it makes for difficult cw reception especially on SKN night . So having acquired
some Heathkit crystal filters including a rare 200 HZ filter I decided to do a little project to see if I could make an adapter to use these filters with my BC348 and improve the CW reception . It took a couple of months last winter working evenings to come up with a workable unit , grinding a special crystal for it, repairing a couple of other crystals that were slightly off frequency and making a crude but usable circuit board as the project developed . This video is not
a construction article I present it here more like a Show and tell demonstrating to others and to me that this could be done and it has proven to work far better than my expectations . My friend Ron asked me why I did not make a Youtube video on this so I decided to do that . This was a fun project from start to finish I expected many more problems actually than I encountered I honestly did not expect it to work so well . I also expected
the BC348 to NOT be stable enough for narrow CW filters I was pleasantly
surprised to see I was wrong about that the BC348 is VERY STABLE after a decent warm up period 20 to 30 minutes . I wanted here to show my sloppy
home brew quickie circuit board construction for home built projects and the use of recycled or re-purposed components . If you do projects yourself in electronics have patience and TEST YOUR PARTS as much as you can before soldering them in the circuit I spent a LOT of time checking all the parts I could check .
73 and GOOD DX BOB .
The BC 348 receiver is well known among radio Amateurs the first
receiver I ever owned was a BC348 and I made my first ever QSO's
using the BC348 I sold the first one and regretted it so this is the second BC348 in my shack which I bought at a Hamfest in 1972 . The bandwidth on receive of the original is as they say broad as a barn this was ok for what it was designed in World War 2 but on the crowded ham bands it makes for difficult cw reception especially on SKN night . So having acquired
some Heathkit crystal filters including a rare 200 HZ filter I decided to do a little project to see if I could make an adapter to use these filters with my BC348 and improve the CW reception . It took a couple of months last winter working evenings to come up with a workable unit , grinding a special crystal for it, repairing a couple of other crystals that were slightly off frequency and making a crude but usable circuit board as the project developed . This video is not
a construction article I present it here more like a Show and tell demonstrating to others and to me that this could be done and it has proven to work far better than my expectations . My friend Ron asked me why I did not make a Youtube video on this so I decided to do that . This was a fun project from start to finish I expected many more problems actually than I encountered I honestly did not expect it to work so well . I also expected
the BC348 to NOT be stable enough for narrow CW filters I was pleasantly
surprised to see I was wrong about that the BC348 is VERY STABLE after a decent warm up period 20 to 30 minutes . I wanted here to show my sloppy
home brew quickie circuit board construction for home built projects and the use of recycled or re-purposed components . If you do projects yourself in electronics have patience and TEST YOUR PARTS as much as you can before soldering them in the circuit I spent a LOT of time checking all the parts I could check .
73 and GOOD DX BOB .
