[GreenKeys] CV-2460

[Nick England]

About tuning a CV-2460.
The 200 Hz shift was used on UHF AM so precise tuning wasn't needed.

For 850 shift, yes, it was intended for use in HF frequency-synthesized
systems. In this era, HF radio equipment shipboard was controlled by a
highly stable master oscillator with its reference signal distributed to
all the equipment.
These master oscillators used a quartz crystal inside a regulated oven
inside another regulated oven, all inside a Dewar flask. They could be set
to better than 1 part in 10^11 and drift was typically better than 1 part
in 10^10. That's about 0.3 milliseconds of accumulated error per month. It
had ni-cad battery backup so it could periodically be taken off ship to a
calibration lab where it was compared against WWVB or a cesium beam
standard. The first version of these units (AN/URQ-9) used tubes so there
was a 2 hour time limit for transportation between ship and the cal lab.
The later transistor versions lasted 8 hours on battery power.

Nick England K4NYW
www.navy-radio.com


On Fri, May 8, 2020 at 10:47 PM Jim Haynes <jhhaynes at earthlink.net> wrote:

>
> ...There is no tuning indicator, so apparently it is intended for use only
> with modern frequency-synthesized equipment which preserves accurate
> frequency translation...
>
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