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Author Topic: WW2 Navy RAO-2/ CNA-46187 rECEIVER  (Read 1765 times)
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W2TRH
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« on: March 09, 2024, 05:58:59 PM »

Hello out there, i have a RAO-2 receiver on the USS Slater Museum ship that has a blown power transformer. Looks likeit's the same transformer thats in an nc-100, cannot find the center tap ratting, does any one know of an off the shelf replacement for it??, Hmmand e.t.c,
Steve
W2TRH
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W1DAN
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« Reply #1 on: May 02, 2024, 08:25:31 PM »

Steve:

The RAO-3 manual may provide some clues:
https://www.navy-radio.com/manuals/rao3-900359-4409.pdf

See Page 66, where T104 has Secondary 1 which provides 494vac CT at 0.055a.

Dan
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n8fvj
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« Reply #2 on: June 02, 2024, 10:48:08 AM »

Hammond 272BX. Provides 250 volts DC.
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W3SLK
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« Reply #3 on: June 03, 2024, 09:51:11 AM »

W2TRH said:
Quote
Hello out there, i have a RAO-2 receiver on the USS Slater Museum ship that has a blown power transformer. Looks likeit's the same transformer thats in an nc-100, cannot find the center tap ratting, does any one know of an off the shelf replacement for it??, Hmmand e.t.c
I think I may have a 'real' Peter Dahl replacement for the NC-100 that was given to me by Joe, N3IBX(SK). Verify that is the case.
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Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
WB6NVH
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« Reply #4 on: June 03, 2024, 07:56:23 PM »

Those transformers were about as robust as a canary and many are defective now so it isn't surprising.  Rewinding services tend to cost more than the blasted receiver is worth.  It seems a good idea to get the wax capacitors and any leaky filter caps out before applying power.
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Geoff Fors
Monterey, California
n8fvj
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« Reply #5 on: June 06, 2024, 08:27:10 AM »

W2TRH said:
Quote
Hello out there, i have a RAO-2 receiver on the USS Slater Museum ship that has a blown power transformer. Looks likeit's the same transformer thats in an nc-100, cannot find the center tap ratting, does any one know of an off the shelf replacement for it??, Hmmand e.t.c
I think I may have a 'real' Peter Dahl replacement for the NC-100 that was given to me by Joe, N3IBX(SK). Verify that is the case.
I already posted Hammond replacement transformer.
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Tom W2ILA
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« Reply #6 on: June 06, 2024, 09:37:56 AM »

Steve,
Hope you can find a replacement for that RAO.  Junker quality NC100, NC200 and RAO have been appearing at the fests.  I'll be on the lookout for you.
73
Tom
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W3SLK
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« Reply #7 on: June 06, 2024, 10:47:41 AM »

n8fvj said:
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I already posted Hammond replacement transformer.

To which I replied:
Quote
I think I may have a 'real' Peter Dahl replacement for the NC-100 that was given to me by Joe, N3IBX(SK). Verify that is the case.

Meaning it was actually made by Peter Dahl. Not a Hammond clone!
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Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
WBear2GCR
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Brrrr- it's cold in the shack! Fire up the BIG RIG


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« Reply #8 on: June 10, 2024, 09:52:14 PM »

Hello out there, i have a RAO-2 receiver on the USS Slater Museum ship that has a blown power transformer. Looks likeit's the same transformer thats in an nc-100, cannot find the center tap ratting, does any one know of an off the shelf replacement for it??, Hmmand e.t.c,
Steve
W2TRH

I have at least ONE National NC-101 that you can have to take the transformer from.
OUGHT to be the same as the NC-100.
Along with the rest of the radio...
...I will never use it (again).

Anyone else who wants one or two - just let me know?

Also w1DAN is known to have National parts...

QSL, OM??

                               
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_-_- bear WB2GCR                   http://www.bearlabs.com
Detroit47
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« Reply #9 on: June 11, 2024, 01:36:53 PM »

Hey Bear the band has been great. Where you been? All I hear is PW lids.

John in Detroit
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W2TRH
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« Reply #10 on: June 18, 2024, 02:36:00 PM »

Hello Gent's apoigies for not getting back to the list here, lot's going on at my QTH , the hammond solution looks great and jersey fest and near fest i will be on the look out for parts receivers too as we have other receivers on the Slater like it , when it it failed i had to say, I love the smell of burnt transformer in the afternoon Smiley thank you for your time and effort,
Steve
W2TRH
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