Doug,
Actually, I have no idea of what you are referring to. The HRO
receivers have the large dial which at that time provided good dial
reading vs. frequency readings. That was done with a chart of frequency
vs. dial number, and with Elecraft gear, that is done in firmware with
the display showing the actual frequency without reference to a graph.
There is a crystal filter in the HRO, but it is not like the filters in
the Elecraft gear - in those old days, you had to adjust the crystal
phasing to peak the signal and it was only useful for CW.
I don't know which HRO receiver you are referring to. There is a big
difference between them, culminating with the HRO50. My experience with
National receivers goes back to the NC-100 which was the predecessor to
the HRO series, and has the bandswitching system of the NC-240D (I still
have it in the attic - a restoration project for "someday-maybe", but it
may never actually happen).
73,
Don W3FPR
On 9/3/2017 1:46 PM, Doug Millar via Elecraft wrote:
> For fun- What technical design technique does the National HRO receiver series have in common with the Elecraft series of receivers that is unique to both of them? Doug K6JEY
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