[Elecraft] Diversity mode preamp

[Tom W8JI]

> I've missed much of the traffic in this thread, BUT -- I have integrated
> Beverages into my contest station using one of the excellent preamps
> that I believe you designed for DX Engineering. The result is that the
> signal level from my Beverages is usually a good match for the level
> from my full size transmit antennas, so I don't need to do much level
> matching within the K3s.  I developed this system soon after I moved
> here and installed the Beverages, and was running TS850s (with the N6TR
> mod for RX antenna input), and later with MPs.


A good system always balances the signal levels in. Always. I can't imagine 
ever having antenna choices that have not been relatively equalized in noise 
floor.

The problem is sometimes there is a need to increase or reduce gain on both 
RX channels immediately, in just fractions of a second time. Say a strong 
station comes on for a while, or we change directions and a modest signal 
becomes strong and starts to overload, or one direction has 20 dB more 
noise. Another case is the noise floor has crept up, and the op was too busy 
to notice and now suddenly does but is busy.