Paul -
The 7 is a lot more amenable than the 4. It has wideband filters in front, so the first real
selectivity is the 45 MHz roofing filter. Each BAND is much wider than usable by the SDR.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Paul Christensen wrote:
But..does it track with the tuning of the R-4C?
Why would ya want to tune 2 RX's at the same time?
73,
Lee
The preselector is the limiting factor as Garey pointed out. The problem is worse on the lower
bands, especially 160m. You would need to tap ahead of the preselector -- essentially at the
antenna terminal. So, the antenna feed must be split with a simple 50/50 power divider, one side
to the R-4, the other to the SDR receiver. This is the same manner used by folks who use
up-converting transceivers like the Ten Tec Omni 7, Icom 7700, 7800, etc. Only, the sync issue
between the R-4 and SDR receiver would be very difficult to solve since there's no computer
interface on the R-4 to allow for tracking to the SDR receiver.
I cannot see a way to effectively use an SDR receiver as a panadapter with a Drake 4 or 7-line
receiver.
Paul, W9AC
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