[time-nuts] WWV / WWVH / WWVB

[Bill Hawkins]

Brad,

I started with audio in 1950, got into receivers, never got into
transmitters, except some carrier current stuff. Only real difference
in receivers is the concept of tuned circuits for selectivity as
opposed to wide-band audio.

Well, there's also detection and AGC. Um, and mixing (hetrodyning)
or regeneration. Probably other stuff as well. Actually, audio amps
are pretty simple compared to 25 tube military receivers of the 50s.
And receivers are simpler than Caesium or Rubidium standards, or
precision frequency synthesizers.

The receiver that showed phase shift is a Lavoie LA800, s/n 125.
Receives WWV or WWVH on 5 or 15 MHz. Takes 0.05 to 10 MHz from
your standard and generates 10 MHz for the circular sweep. Beam
is intensity modulated by received signal cleverly converted to
10 MHz. Easier to see phase shift than Lissajous method.

The Specific Products receiver is the WWVC, with filters. Receives
WWV/H on 2.5, 5, 10, 15 and 20 MHz. Filters 400 or 600 Hz tones,
or ticks, or open for voice. Has audio output.

Both have 2" scope and speaker. The WWVC just has X and Y for
Lissajous figures. Have manual for each.

Bill Hawkins


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brad Stockdale
Sent: Thursday, November 20, 2008 2:55 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] WWV / WWVH / WWVB

At 02:24 PM 11/20/2008, you wrote:

>Are you open to vacuum tube equipment?

Surely. Tubes are another interest of mine, but I only really deal with
audio stuff. One of my ham friends tried to ease my fear of RF equipment
by telling me that RF gear was basically just audio gear with
chokes/coils and tuned circuits. Didn't help aleviate my hesitation of
getting into it. Haha.

>I have a set with a 2" scope tube that let me see the phase shift 
>between WWV and WWVH when propagation conditions brought them both to 
>Minneapolis. Also a Specific Products WWV receiver.

Do you happen to have a make/model of this neat sounding receiver with
the scope built in?

Thanks,
Brad