BC-348 Modifications
Vložit
- čas přidán 22. 06. 2009
- Four easy modifications that can be added to a BC-348Q to make it a more practical for Ham radio or SWL use, Please note I started with a 348 that was allready modified, if you have a clean unmodified 348 dont change it. Find one that has been hacked! origional examples are hard to come by and shoud be preserved.
Ray Fantini KA3EKH - Věda a technologie
Hi Ray, I had 4 of these, some mint some OK. My first rcvr was a BC-224 when I was a Novice. I rack mounted 2 of these on the original shock mount base which is now quite rare. I restored 3, '348's but I could never get the S-meter circuit to work ! I had the exact meter that's in yours. And yes, all my radios suffered from reduced audio output with the Crystal filter "in". Alas, all my '348's now reside in other collections, one in a restored B-17 in California. They were great radios, extremely well made. I own most of the era's "Surplus Conversion" handbooks garnered over the years and not for sale ! Thanks for posting.
Only had two opportunities to play with BC-348s. In High School in Oct 1963 a classmate (future WN5IXV/KK5HP) had one. Listened to some NDBs on it, but local 930 AM was getting into the i.f. of it. In the fall of 1970 the UT Austin Physics building had one. Used it to get the propcasts and Geoalerts from WWV during 6-10 pm Monday night lab class. Hooked up to a Tektronics scope and took a photo of a WWV "tick". Also heard the Russian RID ident on 10-MHz.
Nice radio. I've got one that's been modified in similar ways for s-meter, speaker level audio and standard ac power. It works well. I bought it at a local hamfest. I'll try to do a video in the future.
i have a complete BC-348 Receiver, including the Dynamotor is still used as the internal hi voltage power supply,this part of circuit i have preserved i upgraded only the carbon resistor and capacitors,with the change of time this components present several leakage and resistance alterations.
©2011 Guimbadriver Broadcast Corporation,All rights reserved.
1948 CQ modification manual - you the man!
There is a drawing of the S meter circuit on my web site on the BC-348 modifications page. The new s meter circuit goes between the feed to the screen grid of the 2nd IF amplifier and the screen supply, the screen grid on the amplifier is pin 6. Be careful because high voltage will be on that point.
Ray Fantini
Loved it! Thanks!
Nice radio
All the radios I know of, when using the filters the volume goes down...liike on my Hallicrafters SX-781. Nice video..
well done WB5MZO
Ok good infom 👍
Hi Ray,..I just acquired a BC 348-B..and after doing some "Cleaning" of the exterior ( it came from a Smokers home) and cleaning up the incoming AC line ( I added a Computer type Cord/plug) the radio works fine with a small "Long wire antenna"..can ypou tell me exactly where you tapped the line into the radio for the "input" for the "S" meter ( Tube, and tube socket number)..Thank you!!.......Richard KC6VKV Reno, Nevada