Tag Archives: Mr. Carlson’s Lab

Standing Inside a Broadcast Transmitter While it’s ON!

I stumbled across a video from the fabulous Mr Carlson’s Lab YouTube channel. If you haven’t check out this channel before, and you are really eager to learn more about electronics, this is a wonderful YouTube site.

So, in the latest episode, Mr Carlson takes us on a tour of a very large Gates BC-250-GY broadcast transmitter from the 40’s era. Lots of big tubes, transformers and capacitors! This is an old mediumwave transmitter that he has restored. Although the technology has changed markedly since the 1940s, the basic principals of transmission are still present. And, interestingly, he points out that this particular unit was in regular service right up until as recently as 2003!

It’s an interesting show and even if you can’t grab onto all the technical information presented, I think you will enjoy looking at technology from a past era.

73 and good DX to you all,

Rob Wagner VK3BVW

Rob Wagner, VK3BVW, is the author of this post and a regular contributor to the SWLing Post. He also blogs at the Mount Evelyn DX Report.

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Mr. Carlson restores and repairs a Hammarlund HQ-140-X

hammarlund-hq-140xMany thanks to SWLing Post contributor, Moshe, who writes:

Hi Thomas!
You must see this restoration job from Mr. Carlson’s lab:

Click here to view on YouTube.

Thank you for sharing this video, Moshe!  I truly enjoy watching Paul’s videos–no doubt, any radio turned over to him is in expert hands. I love how he explains, in such detail, each action he takes to restore and repair these vintage radios.

Click here to view Mr. Carlson’s YouTube channel.

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Patrick comments on his newly-restored Sony CRF-320


Many thanks to SWLing Post reader, Patrick Mason, who writes from Juneau, Alaska:

I am the owner of the radio that Paul Carlson restored in the video. The serial number is 31358.

I wanted to comment about a statement regarding the receiver’s sensitivity.

After Paul concluded his final tune-up of the radio I can confirm on the shortwave bands, particularly 80 and 40 meters, the sensitivity on AM was better than 0.2 uV/m. That’s outrageous! The VFO is rock solid with no detectable drift whatsoever.

Also, Paul replaced all nylon gears with custom metal gears… they will never fail again.

Anyone considering acquiring this radio, buyer beware! There are many on the WEB who will claim it to be in some ‘totally restored’ condition…when mine arrived from the seller it ‘seemed’ to be ok…..until the counter went fruit loops shortly after unpacking. When Paul got inside the radio it had been ‘tweaked and peeked’….all wrong.

I have a CONSIDERABLE sum invested in this SONY. If I could have known it’s ACTUAL condition BEFORE my purchase, I may have passed….however, I now own what I consider to be the quintessential example of SONY’s best engineering. All I can say, it’s an absolute joy to use

Patrick, you no doubt have a benchmark Sony in that CRF-320.

It’s funny: I was just attending a local hamfest here in North Carolina and a vintage radio vendor pointed out Carlson’s repair video for your CRF-320! He said (and I agree), that your CFR-320 was restored to a level that’s almost in a league of its own. I know you invested a lot in this radio, but you certainly have a fine example now–that is fully-functional–and will most likely outlast us all! Enjoy!

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Video: Yaesu FT-1000MP Repair


Remember Mr. Carlson’s excellent video of the Sony CRF-320 restoration? Many thanks to SWLing Post contributor, Ken McKenzie, who shares a link to the latest Mr. Carlson video–a Yaesu FT-1000MP repair:

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Video: Repairing, restoring and modifying a Sony CRF-320


Many thanks to SWLing Post contributor, Ken McKenzie, for sharing the most comprehensive video you’ll ever find on restoring the Sony CRF-320 receiver:

Click here to watch on YouTube.

Make sure you check out Mr. Carlson’s YouTube channel, Mr. Carlson’s Lab where you’ll find repair videos ranging from solid state to tube gear.

Thanks for the tip, Ken!

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