[time-nuts] Vintage Frequency Measurement

Scott Stobbe scott.j.stobbe at gmail.com
Wed Feb 15 11:03:26 EST 2017

Neat bit of kit. Was it common to get IMD with harmonics out of the
vibrator power supply, and end up on tuning in on the wrong frequency?

On Wed, Feb 15, 2017 at 2:28 AM, Robert Atkinson via time-nuts <
time-nuts at febo.com> wrote:

> Hi,Sorry if I caused confusion by calling the SCR/BC221 a wavemeter.
> Clearly it's not in the wider usage of the term, and the manual and front
> panel call it a frequency meter. However the similar British device was
> called a wavemeter "Wavemeter Class D" http://www.vmarsmanuals.co.uk/
> archive/724_Wavemeter_Class_D_No2_Working_Instructions.pdfSo here in the
> UK the 221 was often also called a wavemeter. Classic wavemeters were also
> available for example the Marconi TF975.
> Robert G8RPI.
>       From: Bob Camp <kb8tq at n1k.org>
>  To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
>  Sent: Monday, 13 February 2017, 23:46
>  Subject: Re: [time-nuts] Vintage Frequency Measurement
> Hi
> With a VFO running, you have a heterodyne frequency meter. That is (at
> least to me)
> a very different device than an absorption wave meter. I know way to put
> power into
> a BC-221 and use it as an absorption device.
> I’m not in any way saying that the LM or the 221 are less useful. They are
> still to this day
> great little boxes. The just aren’t (by my understanding) wave meters.
> That term describes
> a different device that works a different way.
> Bob
> > On Feb 13, 2017, at 5:52 PM, John Miles <john at miles.io> wrote:
> >
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