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Socalmountains.com :: Forums :: HAM RADIO / SCANNERS
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Another boatanchor lives...

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robk (K6RBK)
Tue Jan 07 2014, 09:23AM Email Thread Print View
Registered Member #2194
Joined: Wed Aug 25 2010, 06:46PM
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Posts: 173
Just got this WWII-vintage Signal Corps BC-342-N back into working order (based on hand-written dates inside the the RF cans, it was assembled on/about June 5, 1942).



Still needs significant restoration work and an alignment, but it's come a long way from when it first landed on my test bench.

- Rewired the power supply/rectifier unit
- Replaced a number of leaky caps & bad resistors
- Fixed broken/missing wiring in a number of places in the filament & lamp circuits
- Tracked down a couple shorted air-variable caps (retaining ring had slipped allowing the plates to mesh, shorting B+ to ground)

Any other boatanchor afficionados around here?

Rob
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Craig ⭐
Tue Jan 07 2014, 09:40AM

Total Eclipse 2017 Casper WY

Joined: Fri Aug 18 2006, 05:50PM
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Posts: 11042
Wow Rob, that is definitely an antique! What kind of specs does that unit have (power, freq coverage, etc?) They don't make them like that anymore. I wonder if your voice will sound more natural using tubes? Let us know how it goes Rob.

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robk (K6RBK)
Tue Jan 07 2014, 10:25AM
Registered Member #2194
Joined: Wed Aug 25 2010, 06:46PM
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Posts: 173
Well, this one's just a receiver, with coverage from 1500 to 18000 KC. It's a little deaf (until it gets an alignment) but the audio from strong stations sounds excellent into a pair of headphones. I'm still trying to locate a suitable speaker (or build a matching section to match the 4000 ohm audio output to a modern speaker).

I have my eye on a BC-344-N, which is essentially the same radio except it covers 1.5-1500 KC, which includes the entire AM broadcast band, so it's a little more useful.

These receivers were part of the Signal Corps SCR-299 station, in which the transmitter was a BC-610 (a modified Hallicrafters HT-4). I'd love to get my hands on one of those.

This guy has a nicely restored BC-610:

[Click Here]

Rob
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JohnnyT (K7JNT)
Tue Jan 07 2014, 10:41AM

Joshua 24:15
Registered Member #88
Joined: Sat Oct 28 2006, 07:34PM
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Posts: 1260
Wow, very steampunk. We've come a long way from this to 6 ounce, 30 dollar HTs.



The heart of the wise inclines to the right, but the heart of the fool to the left. - Eccl 10:2
NRA Endowment Member. Because an armed man is a citizen and a disarmed man is a subject.
May your path be crooked, winding, lonesome, dangerous, leading to the most amazing view.
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robk (K6RBK)
Tue Jan 21 2014, 12:26PM
Registered Member #2194
Joined: Wed Aug 25 2010, 06:46PM
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Posts: 173
Had to do one more. This is a BC-344-D (receives 150-1500kc). I picked it up in much better shape than the 342 (both internally and externally), but it needed a similar amount of work to get it working (tons of leaky caps, a few resistors that drifted way out of spec, and a couple bad tubes).

This is a pretty "hot" receiver considering the vintage, and performs quite well despite some persistent AC hum (which I'll get to tracking down eventually).

[Click Here]

Rob
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Rod the Photog
Tue Jan 21 2014, 12:39PM
KA6ROD
Registered Member #184
Joined: Thu Nov 30 2006, 07:45AM
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Posts: 371
Very nice Rob, great job. Keep up the good work !

Rod KA6ROD (the OTHER Rod :-)
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robk (K6RBK)
Tue Jan 21 2014, 05:57PM
Registered Member #2194
Joined: Wed Aug 25 2010, 06:46PM
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Posts: 173
Thanks Rod. If you're ever in Sugarloaf swing by and check 'em out.

You have a couple BAs yourself, if I remember correctly, don't you?

Rob
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Benny ⭐
Tue Jan 21 2014, 09:32PM


Joined: Fri Aug 18 2006, 05:54PM
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That's awesome! Good for you...

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Rod the Photog
Wed Jan 22 2014, 03:01PM
KA6ROD
Registered Member #184
Joined: Thu Nov 30 2006, 07:45AM
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Posts: 371
Yep, I have 4 BA's..... maybe someday I'll work on them.

Later ! Rod
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Bob (WD8BDN)
Wed Sep 03 2014, 10:33AM
Registered Member #10944
Joined: Tue Sep 02 2014, 06:01PM
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Posts: 2
New to the site here and checking things out. This thread took me back to being 11yrs old in Michigan and seeing my 1st real shortwave receiver. A friend from school had a brother that was amazing with electronics and his room was filled with odd and curious sqawking and noisy things. The one that caught my eye and still remains on my wishlist is a BC-348. I was amazed at hearing broadcasts from around the world and being told of how this radio had probably flown over Germany during WW2 in a bomber. I love boatanchors. Thanks robk...great project.

Bob


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