Speaking of 110VAC antenna relays, I reached in the back of my Novice
rig and touched the bare 110VAC contacts on the antenna relay. Youch! I
was a little more cautious after that. Bare contacts wouldn't be allowed
today in commercial gear.
73,
-John NI0K
John Oppenheimer <mailto:j...@kn5l.net>
Saturday, January 26, 2019 4:03 PM
Took a look at Heath's HW-16 design. Quite ingenious: Using the PA
cathode bypass capacitors and current through a diode to shunt the
receiver front end during transmit. Early diode QSK operation. And a
neon bulb relaxation oscillator, using grid block keying voltage, for CW
sidetone.
I enjoy putting vintage stuff on the air for SKN. Heath did not
integrating their separates well back in the day, relying on 110V
antenna relays. I may have some DX-60A/HG-10B/HR-1680/HS-1681 ideas for
next year!
John KN5L
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Charlie T <mailto:pin...@erols.com>
Saturday, January 26, 2019 12:53 PM
The first of that type was, I believe a Hallicrafters SR-75, which was
quite
unique for its day.
If I remember correctly, it was basically an S-38 receiver that used the
audio output tube as a single stage crystal oscillator & RF out function.
Not what you'd call a stellar performer, but it was a first and
self-contained in a package which was same size as the S-38.
73, Charlie k3ICH
-----Original Message-----
From: elecraft-boun...@mailman.qth.net
<elecraft-boun...@mailman.qth.net> On
Behalf Of Kevin Anderson via Elecraft
Sent: Saturday, January 26, 2019 9:13 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] HW-16 Re: Latest Elecraft NEWS
Hopefully not to belabor this too much (or exceed a cutoff on the
conversation), the HW-16 was not a transceiver in the modern sense of
shared
circuitry throughout, but was a transmitter and receiver in the same
cabinet
that shared the same antenna connection and had the necessary cutoff and
receiver protections on transmitting. The knob and dial you see is the
receiver. The transmitter in the radio was CW-only, rock-bound on 80-40-15
meters only when barefoot with just the HW-16. It took the external HG-10
or -10B VFO (or similar grid-keyed VFO) to get you flexible
transmitting not
involving crystals. The receiver circuitry was on a circuit board in one
half of the case and the transmitter circuitry was point-to-point
wiring in
the other half of the cabinet.
A used HW-16, joined later by a HG-10B VFO, was my first radio when I got
licensed in 1993 and used for a couple of years until it got upscaled by a
used Ten-Tec Century 22.
Cheers/73,
Kevin, K9IUA (then KB9IUA from 1993 until 1999)
---------------------------------------
Kevin Anderson, Dubuque IA USA, K9IUA
k9iua (at) yahoo (dot) com
---------------------------------------
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Kevin Anderson via Elecraft <mailto:elecraft@mailman.qth.net>
Saturday, January 26, 2019 8:12 AM
Hopefully not to belabor this too much (or exceed a cutoff on the
conversation), the HW-16 was not a transceiver in the modern sense of
shared circuitry throughout, but was a transmitter and receiver in the
same cabinet that shared the same antenna connection and had the
necessary cutoff and receiver protections on transmitting. The knob
and dial you see is the receiver. The transmitter in the radio was
CW-only, rock-bound on 80-40-15 meters only when barefoot with just
the HW-16. It took the external HG-10 or -10B VFO (or similar
grid-keyed VFO) to get you flexible transmitting not involving
crystals. The receiver circuitry was on a circuit board in one half of
the case and the transmitter circuitry was point-to-point wiring in
the other half of the cabinet.
A used HW-16, joined later by a HG-10B VFO, was my first radio when I
got licensed in 1993 and used for a couple of years until it got
upscaled by a used Ten-Tec Century 22.
Cheers/73,
Kevin, K9IUA (then KB9IUA from 1993 until 1999)
---------------------------------------
Kevin Anderson, Dubuque IA USA, K9IUA
k9iua (at) yahoo (dot) com
---------------------------------------
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