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Title: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: W2TRH 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 Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: W1DAN 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 Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: n8fvj on June 02, 2024, 10:48:08 AM Hammond 272BX. Provides 250 volts DC.
Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: W3SLK 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.Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: WB6NVH 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.
Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: n8fvj on June 06, 2024, 08:27:10 AM W2TRH said: I already posted Hammond replacement transformer.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.Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: Tom W2ILA 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 Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: W3SLK on June 06, 2024, 10:47:41 AM n8fvj said:
Quote 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! Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: WBear2GCR 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?? Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: Detroit47 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 Title: Re: WW2 Navy RAO-2/ CNA-46187 rECEIVER Post by: W2TRH 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 :) thank you for your time and effort, AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Steve W2TRH |