[Milsurplus] The Gas receiver

[Al Klase]

Barry Hauser wrote:
>....... Here's the question -- The GRR-5 seems to use a similar tube lineup as a 600
> series Zenith Transoceanic -- with 1.5 volt tubes, etc. -- some of the same
> numbers.  However, the Zeniths use a 1L6 mixer where the GRR-5 uses a 1R5 (I
> think).  You can sub a 1R5 (much cheaper) to check out a TO, but even if you
> re-align it for the 1R5, sensitivity will fall off above 5 MC.
> 
> Any thoughts, observations on all that?

Barry,

It probably has something to do with the fact that the 1R5 
converter is preceeded by two RF amps and followed by two 
IF's.  I.e., the gain structure of the two radios is 
entirely different.  The TO is betting on the significant 
conversion gain of the 1L6 at the higher frequencies.

BTW, the other major user of 1L6's is the RS-1/GRC-109 
receivers.  Is this the only reason that NOS 1l6's are 
available at all?

Al

-- 
Al Klase - N3FRQ
skywaves@bw.webex.net
Flemington, NJ 08822
Web Page:  http://www.webex.net/~skywaves/home.htm