[Boatanchors] double-sideband suppressed-carrier

[Nick England]

From the contracts and personal experience at NAVELEX I'm pretty sure the USN was lead on the R-1051 and associated gear. 

While ISB is definitely not the same as Costas' DSB, common practice was to run ISB or 4ISB with a not completely suppressed carrier. The CV-157 and FRR-60 for example would AFC lock to a transmitted carrier that was 40 db down and give phenomenal stability on the order of 1 cycle per day drift max. If you are running tone pack RTTY with 16 channels of 85cps shift FSK in each sideband there really ain't much margin for error. 

FWIW I have photos of Costas' FRR-48 at
http://www.navy-radio.com/navy-rcvrs.htm
It isn't clear to me who funded what. Rome Air Dev Cntr (USAF), BuWeps (USN), and BuShips (USN) all had a hand in it somehow. 
cheers
Nick
(phone email acct)


On Oct 19, 2014, at 6:54 PM, WA5CAB--- via Boatanchors <boatanchors at mailman.qth.net> wrote:

> I don't know whether USN or USAF bought the R-1051 et al first.  But the 
> Navy certainly bought a lot of them from the mid-60's on.  The R-1051 and the 
> various transmitters and receiver-transmitters in the family are all ISB.  
> However, no attempt that I know of is made to lock onto the suppressed 
> carrier.
> 
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480