[Milsurplus] [Glowbugs] FW: "Bloopers Must Die"

[Hubert Miller]

Very interesting, Arnie, and thanks!
In fact, because of the fear of U-boat DFing ship communications, in convoys there was no HF or MF inter-ship communications.  In the U.S. convoys at least,
VHF voice equipment on ~ 72 MHz was used, or light blinker, or flag semaphore, for communications.

I last weekend bought an ARR-3 "sonobuoy receiver" 60 – 72 MHz.  What is very interesting is that this instrument, and the transmitting sonobuoy, used the
same modulation standards as FM broadcasting of the time. There was an article in a U.K. radio magazine on changing the tuning range of this receiver and
using it for FM broadcast reception. It does have AFC too, and an audio power output tube. I also have the sonobuoy transmitter for this set.

From what I have read, the national archives may still have recordings made from sononbuoy receivers of enemy subs  breaking up on the final plunge.
Kind of a spooky thought. The medium would be wire, as in 'wire recorder', and the question is, are there any wire recorders around to play at the standards
of the military recorders ?

The Cuban patrol boat equipment, I think, must have been 'passive listening equipment'.

There were German reporting stations in Quebec Canada and New York state, but the whole story has not yet been told.

( for other email group: this thread was initiated by an email I received from a Portland, OR radio club, NWVRS, re the 1929 destruction of masses of
"obsolete" regenerative receivers :
This Utube link just began circulating within the early radio collectors.  It appears that all the tubes were pulled before the sets were trashed.

Sad - The Great American Radio Bonfire of 1929
https://www.youtube.com/watch?v=sAHxShbjw50<https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DsAHxShbjw50&data=02%7C01%7C%7C460dc7e5d3bf4d8537bc08d63dde5821%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636764422495818977&sdata=SDrJ26wUmhqwDRYjX9xyyA51aNVQ66iReCprbktJAco%3D&reserved=0>  )

-Hue

From: Prof. Arnaldo Coro Antich
Subject: Re: [Glowbugs] FW: "Bloopers Must Die"


OK amigo

That one is a Bellini-Tosi RDF dual loops antenna.

Here we have sunken submarine U'176 near one of the northern Cuba coast keys.

It is the grave of its 53 crew members so it can not be brought back to the surface.

U-1b76 was sunk by the Cuban Navy, Marina de Guerra de Cuba using three wooden anti submarine patrol craft part of a lend lease agreement with the US Navy.  They all had a primitive version of a SONAR that was towed at a distance from the small craft .

In very clear waters the U'176 was spotted by an US Navy amphibious plane based in Cuba, that dropped smoke signals where they spotted the submarine.... Patrol Craft CS13 picked up the submarine while it was doing an emergency dive. The depth charges did sunk the sub...

Two days earlier U'176 had sunk two merchant ships very near the Cuban coast. The skipper ignored how transparent the sea water with white sands bottom can be... The Kingfisher float plane observer saw the submarine going down, and the SONAR operator , who was a friend of mine told me how he heard the bubbles glug glug glug as the damaged submarine went to the bottom.

By the way the German Navy had a spy in Havana with a radio station that send data about the ships sailing from the harbor for the submarine to find them easily.... The spy was found using RDF and sent to the firing squad, as the 54th German to die in Cuba, 53 on board the U-176  and Emil Ludwig captured at an old Havana boarding house where he installed his radiotelegraphy station !!!

On 29/10/18 17:48, Hubert Miller wrote:
British ship "Thistlegorm", sunk 1941 Mediterranean. From National Geographic, Feb. 1956.
When I was Hawaii a few years back, I wanted to find a local artist and give a commission to paint for me a similar artwork, with an adjustment or two.
Never got around to it, but it's still on mind. Possibly nothing left of this DF aerial now.
We were travelling at the time with my father, who always wore his "WWII Veteran" hat. Strangers sometimes in restaurants went to the cashier and
paid for his meal, which tremendously moved him.

Some years later, I bought some antenna insulators which had been brought up from a Japanese freighter sunk near Truk harbor. I gave these to a
Portland Oregon radio insulator collector. We were able to identify the ship and I looked up in the old ITU lists the ship's call letters. The Pacific islands
nations laws were changed shortly after this to prohibit removing any WWII artifact.
-Hue

[cid:image001.jpg at 01D46F9E.8B906900]

>  Prof. Arnaldo Coro Antich

They could had added just an untuned grounded grid RF stage  !!!!

During WWII the old merchant ships still afloat used regenerative receivers, and were instructed to use them the least possible, because the well trained german U Boats radio operators could locate the merchant ship using the RDF technique known as riding the submarine on a fixed acimut course, taking one fix, then knowing the speed in knots take a second fix and even further away a third... No need to change course but if under Diesel power keep those engines at the same RPM... If semi submerged running on electric power it will take a longer time to assure the fixes that will provide the baseline of the isosceles triangle... All German, Japanese, Italian, French and American WWII submarines had on board a RDF using a classic loop that can be seen in the photos.
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