[R-390] MF/LF Reception

[Alan Victor]

The challenge to the receiver is certainly NOT sensitivity. IMD is easy to
solve with a decent front end and appropriate roofing selectivity. The real
issue is NOISE level from sources in your surrounding area, near homes,
offices and the IoT stuff. Antenna arrangements which mitigate the
surrounding noise power level are key. As a simple challenge, try receiving
WWVB at 60 kHz with just any antenna. Until I solved the antenna and the
local noise floor at my location, I was hard pressed to copy this large
signal!  Alan W4AMV

On Tue, Sep 19, 2017 at 1:27 AM, Don Reaves <donreaves at gmail.com> wrote:

> Good reminder, Bob, to repurpose unused and inexpensive test equipment.
>
> The HP-3586B Selective Voltmeter is hard to beat, once you learn to live
> with no AGC and no front end filtering.  I've purchased them for less than
> $100, fully operational.  I use one as a stable frequency source.  Dial up
> a frequency on the front panel and that signal is available on the back
> panel of the 3586B at a 1 volt PP level.  They do make very sensitive
> receivers especially for NDB hunting, and the range is audio up to 32MC.
> You usually need at least one of those weird WECO to BNC video style
> adaptors to connect an antenna via BNC.
>
> Don
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