[Boatanchors] RCA Marine Receivers

[Al Klase]

Gang,

I don't know if this reflector supports pix and attachments. AR-8511 
manual attached.
If not, I can show the moderator how to fix that.

Regards,
Al
ARK Sig Block Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/
On 5/28/2022 11:30 AM, Al Klase wrote:
> Richard,
>
> I do have a Radiomarine AR-8511 that was designed primarily for crew 
> entertainment.  Runs on 115 VCD, and has six 35L6 tubes in 
> push-pull-parallel to get the required audio output for multiple 
> speakers from low B+.
> Read about it on page 22 here: 
> https://worldradiohistory.com/Archive-Radio-Age/Radio-Age-1945-July.pdf
>
> Al
>
> ARK Sig Block Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
> On 5/28/2022 1:37 AM, Richard Knoppow wrote:
>> RCA made two late marine receivers, the CRM R6A and a shipboard (DC) 
>> version, the AR 8516. These are nearly identical but use different 
>> tubes so that the AR-8516 can have series heaters on a 110V DC mains 
>> supply. It has two more tubes in its tube count, haven't figured out 
>> which ones yet. I have neither of these receivers but am curious 
>> about them. One big question is the specs. The image rejection for 
>> both receivers is the same and not very good. At 30Mhz its listed as 
>> 30db. That would be acceptable for a single conversion receiver with 
>> a single RF stage and 455Khz IF but not for a double RF stage even if 
>> single conversion and this is a double conversion receiver. In 
>> comparison the RCA AR-88 is speced (and performs) with an image 
>> rejection of 200 at 30Mhz, which translates to 46db. This is very 
>> good for a single conversion receiver but how could a deluxe receiver 
>> of twenty years later be so much worse. So, the question occurs to me 
>> is the spec for the R6C really that bad. I have none to test and am 
>> not likely to ever get one so I wonder if anyone has experience with 
>> them and has ever tested the image rejection. A bit of a puzzle.
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