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Author Topic: Interesting RCA boat anchor spotted in Yangon, Myanmar  (Read 4000 times)
HS0ZIB
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Posts: 631




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« on: October 09, 2017, 06:42:12 AM »

I was in a post office in downtown Yangon (Rangoon) in the country of Myanmar (formerly called Burma), and spotted this old RCA unit on display.

http://www.teachersimon.org/rca-1.html

and

http://www.teachersimon.org/rca-2.html

Although the label is out of focus, I recall that the frequency range stated 2000 - 12000 Kc/s

On the front panel the receiver controls are in the middle and the transmitter controls at the bottom.  The antenna connection is in the center of the top panel of the unit.
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KC1GCG
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« Reply #1 on: October 15, 2017, 07:35:30 PM »

Very interesting. Tried some model number guesses from the fuzzy pic to try to find a matching pic some place but no luck. Can u try to get a better pic or write down and share what it says?. Could be fun to dig a little and get this puppy identified. Hopefully there's no espionage accusations affiliated with such an endeavor.
John. K1jrf
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HS0ZIB
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« Reply #2 on: October 17, 2017, 05:29:39 AM »

Hi John, I'll see what I can do to get some more details.

Don't worry about the espionage concerns!  This boat anchor was being displayed on a table in the post office, alongside some old RTTY equipment and an ancient (and very large) NCR cash register.  The RCA rig seems to have been used to make HF telephone calls 'upcountry'.

I think the type number on the label is 'ETW-3DA1', and I couldn't find anything online about this number.

I will be down in Yangon next month, and I'll drop into the post office again and write down the label details, maybe ask someone in that office about the equipment.  (I can take some photos of the old RTTY equipment if you're interested).

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K1ZJH
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« Reply #3 on: October 17, 2017, 08:47:41 AM »

Looks like old ship to shore equipment.

Pete
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HS0ZIB
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Posts: 631




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« Reply #4 on: December 09, 2017, 10:14:55 PM »

Well, I'm down in Yangon for a few days again.  I dropped into the post office to have a look at this boat-anchor again.

It's too dark in the post office room to get a decent photo, and my phone camera has no flash.

So I copied down the details on the label.

The model number is ETM50AX, serial #53103, operating from 2000 - 12,000 Kc/s, 115/230 volts AC, 50/60 Hz.

The unit has a switch for CW, MCW and phont, and there is a non-discript straight key attached, as well as an old-fashioned telephone set.  The front panel also has controls for RF gain and grid/plate current, and a meter to display the current.

BTW, on the roof of this old 6-storey building are various wire dipole antennas, no longer used (I assume, since the wire has twisted together in the wind).  The length suggests perhaps around 49 meter band....
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KD6VXI
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Posts: 164




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« Reply #5 on: December 13, 2017, 09:44:13 AM »

OK, here ya go.

This TX was a general purpose 50 Watt am transceiver, used in a multitude of actual uses.

From RCA:

"Sideband (or SSB) equipment be the
same physical size as a conventional
50-watt AM radiotelephone such as
the RCA type ETM-50. This unit had
been well accepted for airline-ground,
point-to-point, police and other low-
power radio communications."


Hope that helps.

--Shane
KD6VXI
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HS0ZIB
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Posts: 631




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« Reply #6 on: December 15, 2017, 02:34:39 PM »

Shane, thanks for that information.

Do you have ideas of the age or approximate year of manufacture?

Simon
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