[Milsurplus] Navy RAS receiver Noise Limiter

[Al Klase]

Hey Ray,

I was waiting for someone to magically pop up with an answer for you, 
but NO.  After Googling "CKB-50142", and mucking around the web without 
a lot of success, I resorted to actual books.

That unit is almost certainly a Dickert noise limiter.  The 6SN7 
dual-triode is the giveaway.  If you have access to old QST's, see "A 
Modified Dickert Noise Limiter" in the March 1940 issue.  If not, take a 
look at the HQ-120X schematic for some hints. 
http://bama.edebris.com/manuals/hammarlu/hq120x/

Hope that helps a little.

Merry Christmas,
Al


On 12/19/2012 3:08 PM, Ray Fantini wrote:
> I have been spending too much time working on antique computers the last couple years, so decided the other day that although it has been working would pull my old Navy RAS apart and fix a couple little nagging problems with it. Dirty gain control and wobbly latch on the coil hold down. One thing leads to another and now the radio is completely apart. While the radio is apart am doing things like cleaning and checking the tubes and the resistor values, being that I had already replaced all the capacitors some years back. I do have the manual for the RAS series receivers but the problem that I am running into now is that I have the CKB-50142 Noise Peak Limiter modification installed in the radio and have no information on that, anyone have the schematic or any documentation on the modification?  If you're not familiar with the CKB Noise Limiter modification it's a little chassis with a couple tubes and a transformer on it that plugs into where the DET/ AVC tube (6F8) was, othe
>   r than that you don't change anything on the radio but you no longer have to put up with ear splitting static crashes that use to plague that radio. Way simpler then the TCS noise limiter modification (CUZ-50159) that involves a switch and wire.
>
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1430 / Virus Database: 2637/5470 - Release Date: 12/19/12

-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/