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April 21st 05, 05:36 PM

wrote:

Dave Heil wrote:
wrote:

wrote:

With the RF Gain on maximum and AGC disabled, BFO on,
one will eventually start "hearing morse code" on "the
bands." :-)

Wrong, Len. With the AGC disabled and BFO on, the *AF* gain
should be
at maximum and the RF gain used for volume control.

For both SSB and CW/Morse reception

...and for RTTY.

Well, that depends on the type of RTTY operation and equipment. While
we hams usually use "SSB" detection of RTTY signals, and then an audio
TU, there are other ways.

While hams have used pure AFSK with FM at VHF, a BFO or product detector
in the SSB mode is the traditional of RTTY reception. It was also the
method used by USG agencies at HF.

There was a QST article in the late 1950s or so, showing an adapter
that used 'real' FM demodulation of the IF signal. Built around a
BC-453 Command set. Had a 'scope built-in, IIRC. Complete receiving
setup in a rack mountable unit, just feed the IF signal (190-550 kHz)
from almost any superhet to it.

I'm sure there were manufactured equivalents.

I'd have thought the old boy would have known all that
with his decades of experience.

"It's a trap"...

I suppose we're doomed to another "I meant to do that".

With the BFO injection of most old
boatanchor receivers,

(like the R-70?)

Naw, Len's relic has a good product detector. He could almost use the
method he described except he would have no need to switch the AGC to
the "off" position--just switch it to the "fast" position.

he'd likely hear little or no beat note
at all using the method he advocates.

Maybe that's the point...

If he couldn't copy it either way, what's the diff?

Dave K8MN

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