[R-390] Z503 replacement

[rbethman]

Perry, & Et Al,

I believe that these were "overbuilt" or "over-engineered" for a *REAL* 
reason.

Remember that these were designed to be a cost reduction version of the 
R-390/URR. As such, they had tight specifications to engineer to.

I would suspect that there would be *some* degradation of the circuitry 
*IF* replaced with a good PI-wound 455Kc IF transformer that did NOT 
have the same shielding.

However, *WE* are NOT radio intercept operators that are trying to 
operate and get the results needed, such as those in Operation Boresight.

YES I *know* some folks are shocked over the "formerly" classified 
program. It has however, been posted on the Internet for well over 5 years.

Bob - N0DGN

On 4/2/2011 11:37 AM, Perry Sandeen wrote:
> List,
>
> Wrote:  I have to say that whenever I take a can cover off, (Only two - both on the IF deck.), that these would be very difficult to make by ourselves.
>
> It is a PI-Wound coil, and has a resin around and over it - PLUS - it has a ferrite cup that the resin is holding on VERY dearly with.
>
> Bob,
>
> I was somewhat aware of the complicated construction.
>
> Is it possible that this was an extremely over-engineered part?
>
> My question really was: why can’t a satisfactory electrical equivalent be made out of components we can buy?  After all it is a 455 KHz part.
>
> I’d rather make one or two up for spares now, even if I never need them, than to have to scrounge up a replacement for a dead one in the future.
>
> Has anyone on the list pursued an alternative replacement method or made one?
>
> Regards,
>
> Perrier
>
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