[HBR] which receiver is THE BEST receiver

[Amargosa Enterprises]

Jim N2EY wrote

> In a message dated 4/6/06 3:06:07 PM Eastern Daylight Time,
> amargosaent at iscweb.com writes:
>
>
> > Depending on your personal drift requirement, my experience with
> > a 20-tube W6TC design differs from your statement as follows -
> >
> > 80 meters, ambient 65 deg F;  temp comp 7.2 pfd N750
> > cold receiver/cold coil +2.02 kHz drift for 42 minutes to zero beat lock
> > warm receiver/cold coil +1.07 kHz drift for 20 minutes to zero beat lock
> > after initial zero beat lock 65 minutes zero drift to receiver shut-down
>
> Meaning no disrespect, but....
>
> 2 kHz drift on 80 meters is, to me, a bit too much drift. It's very good
for
> the W6TC-type design, but other GB designs can do a lot better.
>
> >
> > All test data taken in 1968.  Coils had been extensively tested and
> > temperature compensated with N750 capacitors; each coil set had
> > at least a dozen test runs before the final N750 cap size was
identified.
> > The receiver uses the W6TC Hartley oscillator design, is built on a
steel
> > chassis with a 19-in rack mount front panel, cabinet with a fuly
> > ventilated hinged top, zero backlash in the Eddystone 898 dial and
> > variable tuning capacitor.
> >
>
> What was used as the frequency standard?
>
> 73 de Jim, N2EY
> ************************************
>
3.5kHz HBR internal crystal marker oscillator was used.  Obiously, the
marker also shifted some unknown amoun since it heated up right along with
the rest of the receiver.    A more accurate source would have been my
BC221/LM frequency meter after it had a 24-hour warmup.  As I ran the test
40 years ago the goal was to create drift data for use by W6TC (with whom I
was working at the time) for his comparison with other drift results.  Ted
insisted on using the crystal marker, so I took an identical approach in the
interest of having my data use the same base as his.  I have neither
knowledge or experience with the GB designs so cannot comment.  Hope this
clarifies my original message for you.

Vy 73 W6HHT