Category Archives: Nostalgia

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.

Hemingway and a Zenith Tranoceanic?

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In a Twitter exchange yesterday @dean_frey shared the photo above of Ernest Hemingway on Safari in Kenya in 1952.

I believe this may be a Zenith Transcoceanic model H500. Could a Transoceanic expert in the Post community confirm of correct me? Please comment!

I know this: I love Earl Thiesen photos.

Thanks for sharing, Dean!

Check out Dean’s twitter feed for other vintage photos.

Dan sheds light on various Hammarlund SP-600 models

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Many thanks to SWLing Post contributor, Daniel Hawkins, who leaves the following comment in reply to our previous post about the Northern Radio SP-600 and discussion about diversity operation. Dan writes:

Diversity operation: two or more receivers and antennas used to copy CW or RTTY from one or more transmitters.

Most of the Hammarlund SP-600s were models built for diversity use including the well-known JX-17, the most common SP-600. Diversity models can be used as single receivers. In this eBay example Northern Radio has modified a SP-600 J-11 for diversity use.

SP-600 nomenclature: J means joint army/navy (JAN) mil-spec components. L means low frequency. X means crystal frequency control in addition to VFO. My SP-600 is a JX-21, which is not a diversity model. Higher model numbers do not necessarily mean later production dates. All SP-600s use the same serial number sequence regardless of model. Somewhere between serial numbers 15,000 and 17,000 (mid 1950’s) Hammarlund stopped using molded black beauty capacitors and switched to installing ceramic capacitors.

The two-digit model numbers indicate model types. JX-1, 7, 10 and 21 were similar non-diversity receivers. SP-600s built for military contracts will have an additional tag showing the military model number(s).

Here is a great page showing Northern Radio modified SP-600s in action with accompanying Northern Radio RTTY gear.

http://www.navy-radio.com/rcvrs/frr28.htm

Thanks for the primer, Dan! I believe I have one of the X models with crystal control, but I’ll need to verify once back home. Any other SP-600 owners out there in the Post readership?

Dame Vera Lynn on the White Cliffs of Dover

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Dame Vera Lynn

Many thanks to SWLing Post contributor, Mike Hansgen (K8RAT), who shares the following news about Dame Vera Lynn’s 100th birthday:

(Source: The Mirror)

The face which inspired hope to a nation during the dark days of WW2 will once again light up the White Cliffs of Dover.

Forces Sweetheart Vera Lynn turns 100 today with a special tribute to the singer and the song she made famous…They’ll be Bluebirds Over The White Cliffs of Dover.

(Source: The Mirror)

A 150ft image of the inspiring Vera is being projected onto the iconic white cliffs in Kent as she becomes the first centurion to release an album! [Continue reading…]

Mike adds:

“It is March 20, the 100th birthday of the wonderful Forces Sweetheart. Remember her boys who flew the Spitfires and the Lancasters. Remember her boys at Arnhem.

Remember them all.”

Mike knows I’m a WWII buff and also a fan of Dame Lynn.

Photo source: Decca Records

Indeed, back in 2015, I recorded The White Cliffs of Dover being played through my WWII era Scott Marine Radio Model SLR-M in honor of Memorial Day. If you missed it, click here to enjoy a little tribute to the Forces Sweetheart.

Wish I could be in Dover tonight to see the white cliffs–! Happy Birthday, Dame Lynn.

Mike also suggests this excellent pictorial timeline tribute to Vera Lynn via the BBC website.

eBay find: R.L. Drake SW4A Shortwave Receiver (new old stock!)

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Many thanks to SWLing Post contributors Eric McFadden (WD8RIF) and Randy Moore (KS4L) who share a link to this rare find on eBay: a New Old Stock (NOS) Drake SW4A.

Click here to view on eBay.

The seller provides this short description:

New in original box and packing, R.L. Drake Short Wave Receiver – model SW.4A. With manual. Old stock, never used. Stored in a safe/dry place.

Being sold AS-IS!

The seller doesn’t have a deep history on eBay, but 100% positive feedback.

I fully expect this price to rise way beyond a figure I could appropriate, but I would certainly love to purchase it. I know this: I wouldn’t leave it in the box for long. After carefully checking it and bringing the voltage up slowly, I would put it on the air. What a beautiful receiver.